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malisetti/ActivityChooserModel.java

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ActivityChooserModel.java
package com.your.package;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ResolveInfo;
import android.database.DataSetObservable;
import android.os.AsyncTask;
import android.os.Build;
import android.text.TextUtils;
import android.util.Log;
import android.util.Xml;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlSerializer;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* <p>
* This class represents a data model for choosing a component for handing a
* given {@link Intent}. The model is responsible for querying the system for
* activities that can handle the given intent and order found activities
* based on historical data of previous choices. The historical data is stored
* in an application private file. If a client does not want to have persistent
* choice history the file can be omitted, thus the activities will be ordered
* based on historical usage for the current session.
* <p>
* </p>
* For each backing history file there is a singleton instance of this class. Thus,
* several clients that specify the same history file will share the same model. Note
* that if multiple clients are sharing the same model they should implement semantically
* equivalent functionality since setting the model intent will change the found
* activities and they may be inconsistent with the functionality of some of the clients.
* For example, choosing a share activity can be implemented by a single backing
* model and two different views for performing the selection. If however, one of the
* views is used for sharing but the other for importing, for example, then each
* view should be backed by a separate model.
* </p>
* <p>
* The way clients interact with this class is as follows:
* </p>
* <p>
* <pre>
* <code>
* // Get a model and set it to a couple of clients with semantically similar function.
* ActivityChooserModel dataModel =
* ActivityChooserModel.get(context, "task_specific_history_file_name.xml");
*
* ActivityChooserModelClient modelClient1 = getActivityChooserModelClient1();
* modelClient1.setActivityChooserModel(dataModel);
*
* ActivityChooserModelClient modelClient2 = getActivityChooserModelClient2();
* modelClient2.setActivityChooserModel(dataModel);
*
* // Set an intent to choose a an activity for.
* dataModel.setIntent(intent);
* <pre>
* <code>
* </p>
* <p>
* <strong>Note:</strong> This class is thread safe.
* </p>
*
* @hide
*/
public class ActivityChooserModel extends DataSetObservable {
/**
* Client that utilizes an {@link ActivityChooserModel}.
*/
public interface ActivityChooserModelClient {
/**
* Sets the {@link ActivityChooserModel}.
*
* @param dataModel The model.
*/
public void setActivityChooserModel(ActivityChooserModel dataModel);
}
/**
* Defines a sorter that is responsible for sorting the activities
* based on the provided historical choices and an intent.
*/
public interface ActivitySorter {
/**
* Sorts the <code>activities</code> in descending order of relevance
* based on previous history and an intent.
*
* @param intent The {@link Intent}.
* @param activities Activities to be sorted.
* @param historicalRecords Historical records.
*/
// This cannot be done by a simple comparator since an Activity weight
// is computed from history. Note that Activity implements Comparable.
public void sort(Intent intent, List<ActivityResolveInfo> activities,
List<HistoricalRecord> historicalRecords);
}
/**
* Listener for choosing an activity.
*/
public interface OnChooseActivityListener {
/**
* Called when an activity has been chosen. The client can decide whether
* an activity can be chosen and if so the caller of
* {@link ActivityChooserModel#chooseActivity(int)} will receive and {@link Intent}
* for launching it.
* <p>
* <strong>Note:</strong> Modifying the intent is not permitted and
* any changes to the latter will be ignored.
* </p>
*
* @param host The listener's host model.
* @param intent The intent for launching the chosen activity.
* @return Whether the intent is handled and should not be delivered to clients.
*
* @see ActivityChooserModel#chooseActivity(int)
*/
public boolean onChooseActivity(ActivityChooserModel host, Intent intent);
}
/**
* Flag for selecting debug mode.
*/
private static final boolean DEBUG = false;
/**
* Tag used for logging.
*/
private static final String LOG_TAG = ActivityChooserModel.class.getSimpleName();
/**
* The root tag in the history file.
*/
private static final String TAG_HISTORICAL_RECORDS = "historical-records";
/**
* The tag for a record in the history file.
*/
private static final String TAG_HISTORICAL_RECORD = "historical-record";
/**
* Attribute for the activity.
*/
private static final String ATTRIBUTE_ACTIVITY = "activity";
/**
* Attribute for the choice time.
*/
private static final String ATTRIBUTE_TIME = "time";
/**
* Attribute for the choice weight.
*/
private static final String ATTRIBUTE_WEIGHT = "weight";
/**
* The default name of the choice history file.
*/
public static final String DEFAULT_HISTORY_FILE_NAME =
"activity_choser_model_history.xml";
/**
* The default maximal length of the choice history.
*/
public static final int DEFAULT_HISTORY_MAX_LENGTH = 50;
/**
* The amount with which to inflate a chosen activity when set as default.
*/
private static final int DEFAULT_ACTIVITY_INFLATION = 5;
/**
* Default weight for a choice record.
*/
private static final float DEFAULT_HISTORICAL_RECORD_WEIGHT = 1.0f;
/**
* The extension of the history file.
*/
private static final String HISTORY_FILE_EXTENSION = ".xml";
/**
* An invalid item index.
*/
private static final int INVALID_INDEX = -1;
/**
* Lock to guard the model registry.
*/
private static final Object sRegistryLock = new Object();
/**
* This the registry for data models.
*/
private static final Map<String, ActivityChooserModel> sDataModelRegistry =
new HashMap<String, ActivityChooserModel>();
/**
* Lock for synchronizing on this instance.
*/
private final Object mInstanceLock = new Object();
/**
* List of activities that can handle the current intent.
*/
private final List<ActivityResolveInfo> mActivities = new ArrayList<ActivityResolveInfo>();
/**
* List with historical choice records.
*/
private final List<HistoricalRecord> mHistoricalRecords = new ArrayList<HistoricalRecord>();
/**
* Context for accessing resources.
*/
private final Context mContext;
/**
* The name of the history file that backs this model.
*/
private final String mHistoryFileName;
/**
* The intent for which a activity is being chosen.
*/
private Intent mIntent;
/**
* The sorter for ordering activities based on intent and past choices.
*/
private ActivitySorter mActivitySorter = new DefaultSorter();
/**
* The maximal length of the choice history.
*/
private int mHistoryMaxSize = DEFAULT_HISTORY_MAX_LENGTH;
private List<String> mIntentFilter = new ArrayList<String>();
private boolean mShowHistory = true;
/**
* Flag whether choice history can be read. In general many clients can
* share the same data model and {@link #readHistoricalDataIfNeeded()} may be called
* by arbitrary of them any number of times. Therefore, this class guarantees
* that the very first read succeeds and subsequent reads can be performed
* only after a call to {@link #persistHistoricalDataIfNeeded()} followed by change
* of the share records.
*/
private boolean mCanReadHistoricalData = true;
/**
* Flag whether the choice history was read. This is used to enforce that
* before calling {@link #persistHistoricalDataIfNeeded()} a call to
* {@link #persistHistoricalDataIfNeeded()} has been made. This aims to avoid a
* scenario in which a choice history file exits, it is not read yet and
* it is overwritten. Note that always all historical records are read in
* full and the file is rewritten. This is necessary since we need to
* purge old records that are outside of the sliding window of past choices.
*/
private boolean mReadShareHistoryCalled = false;
/**
* Flag whether the choice records have changed. In general many clients can
* share the same data model and {@link #persistHistoricalDataIfNeeded()} may be called
* by arbitrary of them any number of times. Therefore, this class guarantees
* that choice history will be persisted only if it has changed.
*/
private boolean mHistoricalRecordsChanged = true;
/**
* Flag whether to reload the activities for the current intent.
*/
private boolean mReloadActivities = false;
/**
* Policy for controlling how the model handles chosen activities.
*/
private OnChooseActivityListener mActivityChoserModelPolicy;
/**
* Gets the data model backed by the contents of the provided file with historical data.
* Note that only one data model is backed by a given file, thus multiple calls with
* the same file name will return the same model instance. If no such instance is present
* it is created.
* <p>
* <strong>Note:</strong> To use the default historical data file clients should explicitly
* pass as file name {@link #DEFAULT_HISTORY_FILE_NAME}. If no persistence of the choice
* history is desired clients should pass <code>null</code> for the file name. In such
* case a new model is returned for each invocation.
* </p>
*
* <p>
* <strong>Always use difference historical data files for semantically different actions.
* For example, sharing is different from importing.</strong>
* </p>
*
* @param context Context for loading resources.
* @param historyFileName File name with choice history, <code>null</code>
* if the model should not be backed by a file. In this case the activities
* will be ordered only by data from the current session.
*
* @return The model.
*/
public static ActivityChooserModel get(Context context, String historyFileName) {
synchronized (sRegistryLock) {
ActivityChooserModel dataModel = sDataModelRegistry.get(historyFileName);
if (dataModel == null) {
dataModel = new ActivityChooserModel(context, historyFileName);
sDataModelRegistry.put(historyFileName, dataModel);
}
return dataModel;
}
}
/**
* Creates a new instance.
*
* @param context Context for loading resources.
* @param historyFileName The history XML file.
*/
private ActivityChooserModel(Context context, String historyFileName) {
mContext = context.getApplicationContext();
if (!TextUtils.isEmpty(historyFileName)
&& !historyFileName.endsWith(HISTORY_FILE_EXTENSION)) {
mHistoryFileName = historyFileName + HISTORY_FILE_EXTENSION;
} else {
mHistoryFileName = historyFileName;
}
}
/**
* Sets an intent for which to choose a activity.
* <p>
* <strong>Note:</strong> Clients must set only semantically similar
* intents for each data model.
* <p>
*
* @param intent The intent.
*/
public void setIntent(Intent intent) {
synchronized (mInstanceLock) {
if (mIntent == intent) {
return;
}
mIntent = intent;
mReloadActivities = true;
ensureConsistentState();
}
}
/**
* Gets the intent for which a activity is being chosen.
*
* @return The intent.
*/
public Intent getIntent() {
synchronized (mInstanceLock) {
return mIntent;
}
}
public List<String> getIntentFilter() {
synchronized (mInstanceLock) {
return mIntentFilter;
}
}
public void setIntentFilter(List<String> intentFilter) {
synchronized (mInstanceLock) {
if (mIntentFilter == intentFilter) {
return;
}
mIntentFilter = intentFilter;
mReloadActivities = true;
ensureConsistentState();
}
}
public void setShowHistory(boolean showHistory) {
synchronized (mInstanceLock) {
if (mShowHistory == showHistory) {
return;
}
mShowHistory = showHistory;
notifyChanged();
}
}
public boolean getShowHistory() {
synchronized (mInstanceLock) {
return mShowHistory;
}
}
/**
* Gets the number of activities that can handle the intent.
*
* @return The activity count.
*
* @see #setIntent(Intent)
*/
public int getActivityCount() {
synchronized (mInstanceLock) {
ensureConsistentState();
return mActivities.size();
}
}
/**
* Gets an activity at a given index.
*
* @return The activity.
*
* @see ActivityResolveInfo
* @see #setIntent(Intent)
*/
public ResolveInfo getActivity(int index) {
synchronized (mInstanceLock) {
ensureConsistentState();
return mActivities.get(index).resolveInfo;
}
}
/**
* Gets the index of a the given activity.
*
* @param activity The activity index.
*
* @return The index if found, -1 otherwise.
*/
public int getActivityIndex(ResolveInfo activity) {
synchronized (mInstanceLock) {
ensureConsistentState();
List<ActivityResolveInfo> activities = mActivities;
final int activityCount = activities.size();
for (int i = 0; i < activityCount; i++) {
ActivityResolveInfo currentActivity = activities.get(i);
if (currentActivity.resolveInfo == activity) {
return i;
}
}
return INVALID_INDEX;
}
}
/**
* Chooses a activity to handle the current intent. This will result in
* adding a historical record for that action and construct intent with
* its component name set such that it can be immediately started by the
* client.
* <p>
* <strong>Note:</strong> By calling this method the client guarantees
* that the returned intent will be started. This intent is returned to
* the client solely to let additional customization before the start.
* </p>
*
* @return An {@link Intent} for launching the activity or null if the
* policy has consumed the intent or there is not current intent
* set via {@link #setIntent(Intent)}.
*
* @see HistoricalRecord
* @see OnChooseActivityListener
*/
public Intent chooseActivity(int index) {
synchronized (mInstanceLock) {
if (mIntent == null) {
return null;
}
ensureConsistentState();
ActivityResolveInfo chosenActivity = mActivities.get(index);
ComponentName chosenName = new ComponentName(
chosenActivity.resolveInfo.activityInfo.packageName,
chosenActivity.resolveInfo.activityInfo.name);
Intent choiceIntent = new Intent(mIntent);
choiceIntent.setComponent(chosenName);
if (mActivityChoserModelPolicy != null) {
// Do not allow the policy to change the intent.
Intent choiceIntentCopy = new Intent(choiceIntent);
final boolean handled = mActivityChoserModelPolicy.onChooseActivity(this,
choiceIntentCopy);
if (handled) {
return null;
}
}
HistoricalRecord historicalRecord = new HistoricalRecord(chosenName,
System.currentTimeMillis(), DEFAULT_HISTORICAL_RECORD_WEIGHT);
addHistoricalRecord(historicalRecord);
return choiceIntent;
}
}
/**
* Sets the listener for choosing an activity.
*
* @param listener The listener.
*/
public void setOnChooseActivityListener(OnChooseActivityListener listener) {
synchronized (mInstanceLock) {
mActivityChoserModelPolicy = listener;
}
}
/**
* Gets the default activity, The default activity is defined as the one
* with highest rank i.e. the first one in the list of activities that can
* handle the intent.
*
* @return The default activity, <code>null</code> id not activities.
*
* @see #getActivity(int)
*/
public ResolveInfo getDefaultActivity() {
synchronized (mInstanceLock) {
ensureConsistentState();
if (!mActivities.isEmpty()) {
return mActivities.get(0).resolveInfo;
}
}
return null;
}
/**
* Sets the default activity. The default activity is set by adding a
* historical record with weight high enough that this activity will
* become the highest ranked. Such a strategy guarantees that the default
* will eventually change if not used. Also the weight of the record for
* setting a default is inflated with a constant amount to guarantee that
* it will stay as default for awhile.
*
* @param index The index of the activity to set as default.
*/
public void setDefaultActivity(int index) {
synchronized (mInstanceLock) {
ensureConsistentState();
ActivityResolveInfo newDefaultActivity = mActivities.get(index);
ActivityResolveInfo oldDefaultActivity = mActivities.get(0);
final float weight;
if (oldDefaultActivity != null) {
// Add a record with weight enough to boost the chosen at the top.
weight = oldDefaultActivity.weight - newDefaultActivity.weight
+ DEFAULT_ACTIVITY_INFLATION;
} else {
weight = DEFAULT_HISTORICAL_RECORD_WEIGHT;
}
ComponentName defaultName = new ComponentName(
newDefaultActivity.resolveInfo.activityInfo.packageName,
newDefaultActivity.resolveInfo.activityInfo.name);
HistoricalRecord historicalRecord = new HistoricalRecord(defaultName,
System.currentTimeMillis(), weight);
addHistoricalRecord(historicalRecord);
}
}
/**
* Persists the history data to the backing file if the latter
* was provided. Calling this method before a call to {@link #readHistoricalDataIfNeeded()}
* throws an exception. Calling this method more than one without choosing an
* activity has not effect.
*
* @throws IllegalStateException If this method is called before a call to
* {@link #readHistoricalDataIfNeeded()}.
*/
private void persistHistoricalDataIfNeeded() {
if (!mReadShareHistoryCalled) {
throw new IllegalStateException("No preceding call to #readHistoricalData");
}
if (!mHistoricalRecordsChanged) {
return;
}
mHistoricalRecordsChanged = false;
if (!TextUtils.isEmpty(mHistoryFileName)) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
executePersistHistoryAsyncTaskSDK11();
} else {
executePersistHistoryAsyncTaskBase();
}
}
}
private void executePersistHistoryAsyncTaskBase() {
new PersistHistoryAsyncTask().execute(new ArrayList<HistoricalRecord>(mHistoricalRecords),
mHistoryFileName);
}
private void executePersistHistoryAsyncTaskSDK11() {
new PersistHistoryAsyncTask().executeOnExecutor(AsyncTask.SERIAL_EXECUTOR,
new ArrayList<HistoricalRecord>(mHistoricalRecords), mHistoryFileName);
}
/**
* Sets the sorter for ordering activities based on historical data and an intent.
*
* @param activitySorter The sorter.
*
* @see ActivitySorter
*/
public void setActivitySorter(ActivitySorter activitySorter) {
synchronized (mInstanceLock) {
if (mActivitySorter == activitySorter) {
return;
}
mActivitySorter = activitySorter;
if (sortActivitiesIfNeeded()) {
notifyChanged();
}
}
}
/**
* Sets the maximal size of the historical data. Defaults to
* {@link #DEFAULT_HISTORY_MAX_LENGTH}
* <p>
* <strong>Note:</strong> Setting this property will immediately
* enforce the specified max history size by dropping enough old
* historical records to enforce the desired size. Thus, any
* records that exceed the history size will be discarded and
* irreversibly lost.
* </p>
*
* @param historyMaxSize The max history size.
*/
public void setHistoryMaxSize(int historyMaxSize) {
synchronized (mInstanceLock) {
if (mHistoryMaxSize == historyMaxSize) {
return;
}
mHistoryMaxSize = historyMaxSize;
pruneExcessiveHistoricalRecordsIfNeeded();
if (sortActivitiesIfNeeded()) {
notifyChanged();
}
}
}
/**
* Gets the history max size.
*
* @return The history max size.
*/
public int getHistoryMaxSize() {
synchronized (mInstanceLock) {
return mHistoryMaxSize;
}
}
/**
* Gets the history size.
*
* @return The history size.
*/
public int getHistorySize() {
synchronized (mInstanceLock) {
ensureConsistentState();
return mHistoricalRecords.size();
}
}
/**
* Ensures the model is in a consistent state which is the
* activities for the current intent have been loaded, the
* most recent history has been read, and the activities
* are sorted.
*/
private void ensureConsistentState() {
boolean stateChanged = loadActivitiesIfNeeded();
stateChanged |= readHistoricalDataIfNeeded();
pruneExcessiveHistoricalRecordsIfNeeded();
if (stateChanged) {
sortActivitiesIfNeeded();
notifyChanged();
}
}
/**
* Sorts the activities if necessary which is if there is a
* sorter, there are some activities to sort, and there is some
* historical data.
*
* @return Whether sorting was performed.
*/
private boolean sortActivitiesIfNeeded() {
if (mActivitySorter != null && mIntent != null
&& !mActivities.isEmpty() && !mHistoricalRecords.isEmpty()) {
mActivitySorter.sort(mIntent, mActivities,
Collections.unmodifiableList(mHistoricalRecords));
return true;
}
return false;
}
/**
* Loads the activities for the current intent if needed which is
* if they are not already loaded for the current intent.
*
* @return Whether loading was performed.
*/
private boolean loadActivitiesIfNeeded() {
if (mReloadActivities && mIntent != null) {
mReloadActivities = false;
mActivities.clear();
List<ResolveInfo> resolveInfos = mContext.getPackageManager()
.queryIntentActivities(mIntent, 0);
final int resolveInfoCount = resolveInfos.size();
for (int i = 0; i < resolveInfoCount; i++) {
ResolveInfo resolveInfo = resolveInfos.get(i);
if (mIntentFilter.size() == 0 || mIntentFilter.contains(resolveInfo.activityInfo.packageName.toLowerCase())) {
mActivities.add(new ActivityResolveInfo(resolveInfo));
}
}
return true;
}
return false;
}
/**
* Reads the historical data if necessary which is it has
* changed, there is a history file, and there is not persist
* in progress.
*
* @return Whether reading was performed.
*/
private boolean readHistoricalDataIfNeeded() {
if (mCanReadHistoricalData && mHistoricalRecordsChanged &&
!TextUtils.isEmpty(mHistoryFileName)) {
mCanReadHistoricalData = false;
mReadShareHistoryCalled = true;
readHistoricalDataImpl();
return true;
}
return false;
}
/**
* Adds a historical record.
*
* @param historicalRecord The record to add.
* @return True if the record was added.
*/
private boolean addHistoricalRecord(HistoricalRecord historicalRecord) {
final boolean added = mHistoricalRecords.add(historicalRecord);
if (added) {
mHistoricalRecordsChanged = true;
pruneExcessiveHistoricalRecordsIfNeeded();
persistHistoricalDataIfNeeded();
sortActivitiesIfNeeded();
notifyChanged();
}
return added;
}
/**
* Prunes older excessive records to guarantee maxHistorySize.
*/
private void pruneExcessiveHistoricalRecordsIfNeeded() {
final int pruneCount = mHistoricalRecords.size() - mHistoryMaxSize;
if (pruneCount <= 0) {
return;
}
mHistoricalRecordsChanged = true;
for (int i = 0; i < pruneCount; i++) {
HistoricalRecord prunedRecord = mHistoricalRecords.remove(0);
if (DEBUG) {
Log.i(LOG_TAG, "Pruned: " + prunedRecord);
}
}
}
/**
* Represents a record in the history.
*/
public final static class HistoricalRecord {
/**
* The activity name.
*/
public final ComponentName activity;
/**
* The choice time.
*/
public final long time;
/**
* The record weight.
*/
public final float weight;
/**
* Creates a new instance.
*
* @param activityName The activity component name flattened to string.
* @param time The time the activity was chosen.
* @param weight The weight of the record.
*/
public HistoricalRecord(String activityName, long time, float weight) {
this(ComponentName.unflattenFromString(activityName), time, weight);
}
/**
* Creates a new instance.
*
* @param activityName The activity name.
* @param time The time the activity was chosen.
* @param weight The weight of the record.
*/
public HistoricalRecord(ComponentName activityName, long time, float weight) {
this.activity = activityName;
this.time = time;
this.weight = weight;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((activity == null) ? 0 : activity.hashCode());
result = prime * result + (int) (time ^ (time >>> 32));
result = prime * result + Float.floatToIntBits(weight);
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
HistoricalRecord other = (HistoricalRecord) obj;
if (activity == null) {
if (other.activity != null) {
return false;
}
} else if (!activity.equals(other.activity)) {
return false;
}
if (time != other.time) {
return false;
}
if (Float.floatToIntBits(weight) != Float.floatToIntBits(other.weight)) {
return false;
}
return true;
}
@Override
public String toString() {
StringBuilder builder = new StringBuilder();
builder.append("[");
builder.append("; activity:").append(activity);
builder.append("; time:").append(time);
builder.append("; weight:").append(new BigDecimal(weight));
builder.append("]");
return builder.toString();
}
}
/**
* Represents an activity.
*/
public final class ActivityResolveInfo implements Comparable<ActivityResolveInfo> {
/**
* The {@link ResolveInfo} of the activity.
*/
public final ResolveInfo resolveInfo;
/**
* Weight of the activity. Useful for sorting.
*/
public float weight;
/**
* Creates a new instance.
*
* @param resolveInfo activity {@link ResolveInfo}.
*/
public ActivityResolveInfo(ResolveInfo resolveInfo) {
this.resolveInfo = resolveInfo;
}
@Override
public int hashCode() {
return 31 + Float.floatToIntBits(weight);
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
ActivityResolveInfo other = (ActivityResolveInfo) obj;
if (Float.floatToIntBits(weight) != Float.floatToIntBits(other.weight)) {
return false;
}
return true;
}
public int compareTo(ActivityResolveInfo another) {
return Float.floatToIntBits(another.weight) - Float.floatToIntBits(weight);
}
@Override
public String toString() {
StringBuilder builder = new StringBuilder();
builder.append("[");
builder.append("resolveInfo:").append(resolveInfo.toString());
builder.append("; weight:").append(new BigDecimal(weight));
builder.append("]");
return builder.toString();
}
}
/**
* Default activity sorter implementation.
*/
private final class DefaultSorter implements ActivitySorter {
private static final float WEIGHT_DECAY_COEFFICIENT = 0.95f;
private final Map<String, ActivityResolveInfo> mPackageNameToActivityMap =
new HashMap<String, ActivityResolveInfo>();
public void sort(Intent intent, List<ActivityResolveInfo> activities,
List<HistoricalRecord> historicalRecords) {
Map<String, ActivityResolveInfo> packageNameToActivityMap =
mPackageNameToActivityMap;
packageNameToActivityMap.clear();
final int activityCount = activities.size();
for (int i = 0; i < activityCount; i++) {
ActivityResolveInfo activity = activities.get(i);
activity.weight = 0.0f;
String packageName = activity.resolveInfo.activityInfo.packageName;
packageNameToActivityMap.put(packageName, activity);
}
final int lastShareIndex = historicalRecords.size() - 1;
float nextRecordWeight = 1;
for (int i = lastShareIndex; i >= 0; i--) {
HistoricalRecord historicalRecord = historicalRecords.get(i);
String packageName = historicalRecord.activity.getPackageName();
ActivityResolveInfo activity = packageNameToActivityMap.get(packageName);
if (activity != null) {
activity.weight += historicalRecord.weight * nextRecordWeight;
nextRecordWeight = nextRecordWeight * WEIGHT_DECAY_COEFFICIENT;
}
}
Collections.sort(activities);
if (DEBUG) {
for (int i = 0; i < activityCount; i++) {
Log.i(LOG_TAG, "Sorted: " + activities.get(i));
}
}
}
}
/**
* Command for reading the historical records from a file off the UI thread.
*/
private void readHistoricalDataImpl() {
FileInputStream fis = null;
try {
fis = mContext.openFileInput(mHistoryFileName);
} catch (FileNotFoundException fnfe) {
if (DEBUG) {
Log.i(LOG_TAG, "Could not open historical records file: " + mHistoryFileName);
}
return;
}
try {
XmlPullParser parser = Xml.newPullParser();
parser.setInput(fis, null);
int type = XmlPullParser.START_DOCUMENT;
while (type != XmlPullParser.END_DOCUMENT && type != XmlPullParser.START_TAG) {
type = parser.next();
}
if (!TAG_HISTORICAL_RECORDS.equals(parser.getName())) {
throw new XmlPullParserException("Share records file does not start with "
+ TAG_HISTORICAL_RECORDS + " tag.");
}
List<HistoricalRecord> historicalRecords = mHistoricalRecords;
historicalRecords.clear();
while (true) {
type = parser.next();
if (type == XmlPullParser.END_DOCUMENT) {
break;
}
if (type == XmlPullParser.END_TAG || type == XmlPullParser.TEXT) {
continue;
}
String nodeName = parser.getName();
if (!TAG_HISTORICAL_RECORD.equals(nodeName)) {
throw new XmlPullParserException("Share records file not well-formed.");
}
String activity = parser.getAttributeValue(null, ATTRIBUTE_ACTIVITY);
final long time =
Long.parseLong(parser.getAttributeValue(null, ATTRIBUTE_TIME));
final float weight =
Float.parseFloat(parser.getAttributeValue(null, ATTRIBUTE_WEIGHT));
HistoricalRecord readRecord = new HistoricalRecord(activity, time, weight);
historicalRecords.add(readRecord);
if (DEBUG) {
Log.i(LOG_TAG, "Read " + readRecord.toString());
}
}
if (DEBUG) {
Log.i(LOG_TAG, "Read " + historicalRecords.size() + " historical records.");
}
} catch (XmlPullParserException xppe) {
Log.e(LOG_TAG, "Error reading historical recrod file: " + mHistoryFileName, xppe);
} catch (IOException ioe) {
Log.e(LOG_TAG, "Error reading historical recrod file: " + mHistoryFileName, ioe);
} finally {
if (fis != null) {
try {
fis.close();
} catch (IOException ioe) {
/* ignore */
}
}
}
}
/**
* Command for persisting the historical records to a file off the UI thread.
*/
private final class PersistHistoryAsyncTask extends AsyncTask<Object, Void, Void> {
@Override
@SuppressWarnings("unchecked")
public Void doInBackground(Object... args) {
List<HistoricalRecord> historicalRecords = (List<HistoricalRecord>) args[0];
String hostoryFileName = (String) args[1];
FileOutputStream fos = null;
try {
fos = mContext.openFileOutput(hostoryFileName, Context.MODE_PRIVATE);
} catch (FileNotFoundException fnfe) {
Log.e(LOG_TAG, "Error writing historical recrod file: " + hostoryFileName, fnfe);
return null;
}
XmlSerializer serializer = Xml.newSerializer();
try {
serializer.setOutput(fos, null);
serializer.startDocument("UTF-8", true);
serializer.startTag(null, TAG_HISTORICAL_RECORDS);
final int recordCount = historicalRecords.size();
for (int i = 0; i < recordCount; i++) {
HistoricalRecord record = historicalRecords.remove(0);
serializer.startTag(null, TAG_HISTORICAL_RECORD);
serializer.attribute(null, ATTRIBUTE_ACTIVITY,
record.activity.flattenToString());
serializer.attribute(null, ATTRIBUTE_TIME, String.valueOf(record.time));
serializer.attribute(null, ATTRIBUTE_WEIGHT, String.valueOf(record.weight));
serializer.endTag(null, TAG_HISTORICAL_RECORD);
if (DEBUG) {
Log.i(LOG_TAG, "Wrote " + record.toString());
}
}
serializer.endTag(null, TAG_HISTORICAL_RECORDS);
serializer.endDocument();
if (DEBUG) {
Log.i(LOG_TAG, "Wrote " + recordCount + " historical records.");
}
} catch (IllegalArgumentException iae) {
Log.e(LOG_TAG, "Error writing historical recrod file: " + mHistoryFileName, iae);
} catch (IllegalStateException ise) {
Log.e(LOG_TAG, "Error writing historical recrod file: " + mHistoryFileName, ise);
} catch (IOException ioe) {
Log.e(LOG_TAG, "Error writing historical recrod file: " + mHistoryFileName, ioe);
} finally {
mCanReadHistoricalData = true;
if (fos != null) {
try {
fos.close();
} catch (IOException e) {
/* ignore */
}
}
}
return null;
}
}
}
Raw
ActivityChooserView.java
package com.your.package;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.database.DataSetObserver;
import android.graphics.drawable.Drawable;
import android.support.v4.view.ActionProvider;
import android.support.v7.appcompat.R;
import android.support.v7.internal.widget.ListPopupWindow;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewTreeObserver;
import android.view.ViewTreeObserver.OnGlobalLayoutListener;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.PopupWindow;
import android.widget.TextView;
/**
* This class is a view for choosing an activity for handling a given {@link Intent}.
* <p>
* The view is composed of two adjacent buttons:
* <ul>
* <li>
* The left button is an immediate action and allows one click activity choosing.
* Tapping this button immediately executes the intent without requiring any further
* user input. Long press on this button shows a popup for changing the default
* activity.
* </li>
* <li>
* The right button is an overflow action and provides an optimized menu
* of additional activities. Tapping this button shows a popup anchored to this
* view, listing the most frequently used activities. This list is initially
* limited to a small number of items in frequency used order. The last item,
* "Show all..." serves as an affordance to display all available activities.
* </li>
* </ul>
* </p>
*
* @hide
*/
public class ActivityChooserView extends ViewGroup implements
ActivityChooserModel.ActivityChooserModelClient {
/**
* An adapter for displaying the activities in an {@link android.widget.AdapterView}.
*/
private final ActivityChooserViewAdapter mAdapter;
/**
* Implementation of various interfaces to avoid publishing them in the APIs.
*/
private final Callbacks mCallbacks;
/**
* The content of this view.
*/
private final LinearLayout mActivityChooserContent;
/**
* Stores the background drawable to allow hiding and latter showing.
*/
private final Drawable mActivityChooserContentBackground;
/**
* The expand activities action button;
*/
private final FrameLayout mExpandActivityOverflowButton;
/**
* The image for the expand activities action button;
*/
private final ImageView mExpandActivityOverflowButtonImage;
/**
* The default activities action button;
*/
private final FrameLayout mDefaultActivityButton;
/**
* The image for the default activities action button;
*/
private final ImageView mDefaultActivityButtonImage;
/**
* The maximal width of the list popup.
*/
private final int mListPopupMaxWidth;
/**
* The ActionProvider hosting this view, if applicable.
*/
ActionProvider mProvider;
/**
* Observer for the model data.
*/
private final DataSetObserver mModelDataSetOberver = new DataSetObserver() {
@Override
public void onChanged() {
super.onChanged();
mAdapter.notifyDataSetChanged();
}
@Override
public void onInvalidated() {
super.onInvalidated();
mAdapter.notifyDataSetInvalidated();
}
};
private final OnGlobalLayoutListener mOnGlobalLayoutListener = new OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
if (isShowingPopup()) {
if (!isShown()) {
getListPopupWindow().dismiss();
} else {
getListPopupWindow().show();
if (mProvider != null) {
mProvider.subUiVisibilityChanged(true);
}
}
}
}
};
/**
* Popup window for showing the activity overflow list.
*/
private ListPopupWindow mListPopupWindow;
/**
* Listener for the dismissal of the popup/alert.
*/
private PopupWindow.OnDismissListener mOnDismissListener;
/**
* Flag whether a default activity currently being selected.
*/
private boolean mIsSelectingDefaultActivity;
/**
* The count of activities in the popup.
*/
private int mInitialActivityCount = ActivityChooserViewAdapter.MAX_ACTIVITY_COUNT_DEFAULT;
/**
* Flag whether this view is attached to a window.
*/
private boolean mIsAttachedToWindow;
/**
* String resource for formatting content description of the default target.
*/
private int mDefaultActionButtonContentDescription;
/**
* Create a new instance.
*
* @param context The application environment.
*/
public ActivityChooserView(Context context) {
this(context, null);
}
/**
* Create a new instance.
*
* @param context The application environment.
* @param attrs A collection of attributes.
*/
public ActivityChooserView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
/**
* Create a new instance.
*
* @param context The application environment.
* @param attrs A collection of attributes.
* @param defStyle The default style to apply to this view.
*/
public ActivityChooserView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
TypedArray attributesArray = context.obtainStyledAttributes(attrs,
R.styleable.ActivityChooserView, defStyle, 0);
mInitialActivityCount = attributesArray.getInt(
R.styleable.ActivityChooserView_initialActivityCount,
ActivityChooserViewAdapter.MAX_ACTIVITY_COUNT_DEFAULT);
Drawable expandActivityOverflowButtonDrawable = attributesArray.getDrawable(
R.styleable.ActivityChooserView_expandActivityOverflowButtonDrawable);
attributesArray.recycle();
LayoutInflater inflater = LayoutInflater.from(getContext());
inflater.inflate(R.layout.abc_activity_chooser_view, this, true);
mCallbacks = new Callbacks();
mActivityChooserContent = (LinearLayout) findViewById(R.id.activity_chooser_view_content);
mActivityChooserContentBackground = mActivityChooserContent.getBackground();
mDefaultActivityButton = (FrameLayout) findViewById(R.id.default_activity_button);
mDefaultActivityButton.setOnClickListener(mCallbacks);
mDefaultActivityButton.setOnLongClickListener(mCallbacks);
mDefaultActivityButtonImage = (ImageView) mDefaultActivityButton.findViewById(R.id.image);
mExpandActivityOverflowButton = (FrameLayout) findViewById(R.id.expand_activities_button);
mExpandActivityOverflowButton.setOnClickListener(mCallbacks);
mExpandActivityOverflowButtonImage =
(ImageView) mExpandActivityOverflowButton.findViewById(R.id.image);
mExpandActivityOverflowButtonImage.setImageDrawable(expandActivityOverflowButtonDrawable);
mAdapter = new ActivityChooserViewAdapter();
mAdapter.registerDataSetObserver(new DataSetObserver() {
@Override
public void onChanged() {
super.onChanged();
updateAppearance();
}
});
Resources resources = context.getResources();
mListPopupMaxWidth = Math.max(resources.getDisplayMetrics().widthPixels / 2,
resources.getDimensionPixelSize(R.dimen.abc_config_prefDialogWidth));
}
/**
* {@inheritDoc}
*/
public void setActivityChooserModel(ActivityChooserModel dataModel) {
mAdapter.setDataModel(dataModel);
if (isShowingPopup()) {
dismissPopup();
showPopup();
}
}
/**
* Sets the background for the button that expands the activity
* overflow list.
*
* <strong>Note:</strong> Clients would like to set this drawable
* as a clue about the action the chosen activity will perform. For
* example, if a share activity is to be chosen the drawable should
* give a clue that sharing is to be performed.
*
* @param drawable The drawable.
*/
public void setExpandActivityOverflowButtonDrawable(Drawable drawable) {
mExpandActivityOverflowButtonImage.setImageDrawable(drawable);
}
/**
* Sets the content description for the button that expands the activity
* overflow list.
*
* description as a clue about the action performed by the button.
* For example, if a share activity is to be chosen the content
* description should be something like "Share with".
*
* @param resourceId The content description resource id.
*/
public void setExpandActivityOverflowButtonContentDescription(int resourceId) {
CharSequence contentDescription = getContext().getString(resourceId);
mExpandActivityOverflowButtonImage.setContentDescription(contentDescription);
}
/**
* Set the provider hosting this view, if applicable.
* @hide Internal use only
*/
public void setProvider(ActionProvider provider) {
mProvider = provider;
}
/**
* Shows the popup window with activities.
*
* @return True if the popup was shown, false if already showing.
*/
public boolean showPopup() {
if (isShowingPopup() || !mIsAttachedToWindow) {
return false;
}
mIsSelectingDefaultActivity = false;
showPopupUnchecked(mInitialActivityCount);
return true;
}
/**
* Shows the popup no matter if it was already showing.
*
* @param maxActivityCount The max number of activities to display.
*/
private void showPopupUnchecked(int maxActivityCount) {
if (mAdapter.getDataModel() == null) {
throw new IllegalStateException("No data model. Did you call #setDataModel?");
}
getViewTreeObserver().addOnGlobalLayoutListener(mOnGlobalLayoutListener);
final boolean defaultActivityButtonShown =
mDefaultActivityButton.getVisibility() == VISIBLE;
final int activityCount = mAdapter.getActivityCount();
final int maxActivityCountOffset = defaultActivityButtonShown ? 1 : 0;
if (maxActivityCount != ActivityChooserViewAdapter.MAX_ACTIVITY_COUNT_UNLIMITED
&& activityCount > maxActivityCount + maxActivityCountOffset) {
mAdapter.setShowFooterView(true);
mAdapter.setMaxActivityCount(maxActivityCount - 1);
} else {
mAdapter.setShowFooterView(false);
mAdapter.setMaxActivityCount(maxActivityCount);
}
ListPopupWindow popupWindow = getListPopupWindow();
if (!popupWindow.isShowing()) {
if (mIsSelectingDefaultActivity || !defaultActivityButtonShown) {
mAdapter.setShowDefaultActivity(true, defaultActivityButtonShown);
} else {
mAdapter.setShowDefaultActivity(false, false);
}
final int contentWidth = Math.min(mAdapter.measureContentWidth(), mListPopupMaxWidth);
popupWindow.setContentWidth(contentWidth);
popupWindow.show();
if (mProvider != null) {
mProvider.subUiVisibilityChanged(true);
}
popupWindow.getListView().setContentDescription(getContext().getString(
R.string.abc_activitychooserview_choose_application));
}
}
/**
* Dismisses the popup window with activities.
*
* @return True if dismissed, false if already dismissed.
*/
public boolean dismissPopup() {
if (isShowingPopup()) {
getListPopupWindow().dismiss();
ViewTreeObserver viewTreeObserver = getViewTreeObserver();
if (viewTreeObserver.isAlive()) {
viewTreeObserver.removeGlobalOnLayoutListener(mOnGlobalLayoutListener);
}
}
return true;
}
/**
* Gets whether the popup window with activities is shown.
*
* @return True if the popup is shown.
*/
public boolean isShowingPopup() {
return getListPopupWindow().isShowing();
}
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
ActivityChooserModel dataModel = mAdapter.getDataModel();
if (dataModel != null) {
dataModel.registerObserver(mModelDataSetOberver);
}
mIsAttachedToWindow = true;
}
@Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
ActivityChooserModel dataModel = mAdapter.getDataModel();
if (dataModel != null) {
dataModel.unregisterObserver(mModelDataSetOberver);
}
ViewTreeObserver viewTreeObserver = getViewTreeObserver();
if (viewTreeObserver.isAlive()) {
viewTreeObserver.removeGlobalOnLayoutListener(mOnGlobalLayoutListener);
}
if (isShowingPopup()) {
dismissPopup();
}
mIsAttachedToWindow = false;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
View child = mActivityChooserContent;
// If the default action is not visible we want to be as tall as the
// ActionBar so if this widget is used in the latter it will look as
// a normal action button.
if (mDefaultActivityButton.getVisibility() != VISIBLE) {
heightMeasureSpec = MeasureSpec.makeMeasureSpec(MeasureSpec.getSize(heightMeasureSpec),
MeasureSpec.EXACTLY);
}
measureChild(child, widthMeasureSpec, heightMeasureSpec);
setMeasuredDimension(child.getMeasuredWidth(), child.getMeasuredHeight());
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
mActivityChooserContent.layout(0, 0, right - left, bottom - top);
if (!isShowingPopup()) {
dismissPopup();
}
}
public ActivityChooserModel getDataModel() {
return mAdapter.getDataModel();
}
/**
* Sets a listener to receive a callback when the popup is dismissed.
*
* @param listener The listener to be notified.
*/
public void setOnDismissListener(PopupWindow.OnDismissListener listener) {
mOnDismissListener = listener;
}
/**
* Sets the initial count of items shown in the activities popup
* i.e. the items before the popup is expanded. This is an upper
* bound since it is not guaranteed that such number of intent
* handlers exist.
*
* @param itemCount The initial popup item count.
*/
public void setInitialActivityCount(int itemCount) {
mInitialActivityCount = itemCount;
}
/**
* Sets a content description of the default action button. This
* resource should be a string taking one formatting argument and
* will be used for formatting the content description of the button
* dynamically as the default target changes. For example, a resource
* pointing to the string "share with %1$s" will result in a content
* description "share with Bluetooth" for the Bluetooth activity.
*
* @param resourceId The resource id.
*/
public void setDefaultActionButtonContentDescription(int resourceId) {
mDefaultActionButtonContentDescription = resourceId;
}
/**
* Gets the list popup window which is lazily initialized.
*
* @return The popup.
*/
private ListPopupWindow getListPopupWindow() {
if (mListPopupWindow == null) {
mListPopupWindow = new ListPopupWindow(getContext());
mListPopupWindow.setAdapter(mAdapter);
mListPopupWindow.setAnchorView(ActivityChooserView.this);
mListPopupWindow.setModal(true);
mListPopupWindow.setOnItemClickListener(mCallbacks);
mListPopupWindow.setOnDismissListener(mCallbacks);
}
return mListPopupWindow;
}
/**
* Updates the buttons state.
*/
private void updateAppearance() {
// Expand overflow button.
if (mAdapter.getCount() > 0) {
mExpandActivityOverflowButton.setEnabled(true);
} else {
mExpandActivityOverflowButton.setEnabled(false);
}
// Default activity button.
final int activityCount = mAdapter.getActivityCount();
final int historySize = mAdapter.getHistorySize();
final boolean showHistory = mAdapter.getShowHistory();
if (showHistory && (activityCount==1 || activityCount > 1 && historySize > 0)) {
mDefaultActivityButton.setVisibility(VISIBLE);
ResolveInfo activity = mAdapter.getDefaultActivity();
PackageManager packageManager = getContext().getPackageManager();
mDefaultActivityButtonImage.setImageDrawable(activity.loadIcon(packageManager));
if (mDefaultActionButtonContentDescription != 0) {
CharSequence label = activity.loadLabel(packageManager);
String contentDescription = getContext().getString(
mDefaultActionButtonContentDescription, label);
mDefaultActivityButton.setContentDescription(contentDescription);
}
} else {
mDefaultActivityButton.setVisibility(View.GONE);
}
// Activity chooser content.
if (mDefaultActivityButton.getVisibility() == VISIBLE) {
mActivityChooserContent.setBackgroundDrawable(mActivityChooserContentBackground);
} else {
mActivityChooserContent.setBackgroundDrawable(null);
}
}
/**
* Interface implementation to avoid publishing them in the APIs.
*/
private class Callbacks implements AdapterView.OnItemClickListener,
View.OnClickListener, View.OnLongClickListener, PopupWindow.OnDismissListener {
// AdapterView#OnItemClickListener
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
ActivityChooserViewAdapter adapter = (ActivityChooserViewAdapter) parent.getAdapter();
final int itemViewType = adapter.getItemViewType(position);
switch (itemViewType) {
case ActivityChooserViewAdapter.ITEM_VIEW_TYPE_FOOTER: {
showPopupUnchecked(ActivityChooserViewAdapter.MAX_ACTIVITY_COUNT_UNLIMITED);
} break;
case ActivityChooserViewAdapter.ITEM_VIEW_TYPE_ACTIVITY: {
dismissPopup();
if (mIsSelectingDefaultActivity) {
// The item at position zero is the default already.
if (position > 0) {
mAdapter.getDataModel().setDefaultActivity(position);
}
} else {
// If the default target is not shown in the list, the first
// item in the model is default action => adjust index
position = mAdapter.getShowDefaultActivity() ? position : position + 1;
Intent launchIntent = mAdapter.getDataModel().chooseActivity(position);
if (launchIntent != null) {
launchIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
getContext().startActivity(launchIntent);
}
}
} break;
default:
throw new IllegalArgumentException();
}
}
// View.OnClickListener
public void onClick(View view) {
if (view == mDefaultActivityButton) {
dismissPopup();
ResolveInfo defaultActivity = mAdapter.getDefaultActivity();
final int index = mAdapter.getDataModel().getActivityIndex(defaultActivity);
Intent launchIntent = mAdapter.getDataModel().chooseActivity(index);
if (launchIntent != null) {
launchIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
getContext().startActivity(launchIntent);
}
} else if (view == mExpandActivityOverflowButton) {
mIsSelectingDefaultActivity = false;
showPopupUnchecked(mInitialActivityCount);
} else {
throw new IllegalArgumentException();
}
}
// OnLongClickListener#onLongClick
@Override
public boolean onLongClick(View view) {
if (view == mDefaultActivityButton) {
if (mAdapter.getCount() > 0) {
mIsSelectingDefaultActivity = true;
showPopupUnchecked(mInitialActivityCount);
}
} else {
throw new IllegalArgumentException();
}
return true;
}
// PopUpWindow.OnDismissListener#onDismiss
public void onDismiss() {
notifyOnDismissListener();
if (mProvider != null) {
mProvider.subUiVisibilityChanged(false);
}
}
private void notifyOnDismissListener() {
if (mOnDismissListener != null) {
mOnDismissListener.onDismiss();
}
}
}
/**
* Adapter for backing the list of activities shown in the popup.
*/
private class ActivityChooserViewAdapter extends BaseAdapter {
public static final int MAX_ACTIVITY_COUNT_UNLIMITED = Integer.MAX_VALUE;
public static final int MAX_ACTIVITY_COUNT_DEFAULT = 4;
private static final int ITEM_VIEW_TYPE_ACTIVITY = 0;
private static final int ITEM_VIEW_TYPE_FOOTER = 1;
private static final int ITEM_VIEW_TYPE_COUNT = 3;
private ActivityChooserModel mDataModel;
private int mMaxActivityCount = MAX_ACTIVITY_COUNT_DEFAULT;
private boolean mShowDefaultActivity;
private boolean mHighlightDefaultActivity;
private boolean mShowFooterView;
public void setDataModel(ActivityChooserModel dataModel) {
ActivityChooserModel oldDataModel = mAdapter.getDataModel();
if (oldDataModel != null && isShown()) {
oldDataModel.unregisterObserver(mModelDataSetOberver);
}
mDataModel = dataModel;
if (dataModel != null && isShown()) {
dataModel.registerObserver(mModelDataSetOberver);
}
notifyDataSetChanged();
}
@Override
public int getItemViewType(int position) {
if (mShowFooterView && position == getCount() - 1) {
return ITEM_VIEW_TYPE_FOOTER;
} else {
return ITEM_VIEW_TYPE_ACTIVITY;
}
}
@Override
public int getViewTypeCount() {
return ITEM_VIEW_TYPE_COUNT;
}
public int getCount() {
int count = 0;
int activityCount = mDataModel.getActivityCount();
if (!mShowDefaultActivity && mDataModel.getDefaultActivity() != null) {
activityCount--;
}
count = Math.min(activityCount, mMaxActivityCount);
if (mShowFooterView) {
count++;
}
return count;
}
public Object getItem(int position) {
final int itemViewType = getItemViewType(position);
switch (itemViewType) {
case ITEM_VIEW_TYPE_FOOTER:
return null;
case ITEM_VIEW_TYPE_ACTIVITY:
if (!mShowDefaultActivity && mDataModel.getDefaultActivity() != null) {
position++;
}
return mDataModel.getActivity(position);
default:
throw new IllegalArgumentException();
}
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
final int itemViewType = getItemViewType(position);
switch (itemViewType) {
case ITEM_VIEW_TYPE_FOOTER:
if (convertView == null || convertView.getId() != ITEM_VIEW_TYPE_FOOTER) {
convertView = LayoutInflater.from(getContext()).inflate(
R.layout.abc_activity_chooser_view_list_item, parent, false);
convertView.setId(ITEM_VIEW_TYPE_FOOTER);
TextView titleView = (TextView) convertView.findViewById(R.id.title);
titleView.setText(getContext().getString(
R.string.abc_activity_chooser_view_see_all));
}
return convertView;
case ITEM_VIEW_TYPE_ACTIVITY:
if (convertView == null || convertView.getId() != R.id.list_item) {
convertView = LayoutInflater.from(getContext()).inflate(
R.layout.abc_activity_chooser_view_list_item, parent, false);
}
PackageManager packageManager = getContext().getPackageManager();
// Set the icon
ImageView iconView = (ImageView) convertView.findViewById(R.id.icon);
ResolveInfo activity = (ResolveInfo) getItem(position);
iconView.setImageDrawable(activity.loadIcon(packageManager));
// Set the title.
TextView titleView = (TextView) convertView.findViewById(R.id.title);
titleView.setText(activity.loadLabel(packageManager));
// Highlight the default.
if (mShowDefaultActivity && position == 0 && mHighlightDefaultActivity) {
//TODO convertView.setActivated(true);
} else {
//TODO convertView.setActivated(false);
}
return convertView;
default:
throw new IllegalArgumentException();
}
}
public int measureContentWidth() {
// The user may have specified some of the target not to be shown but we
// want to measure all of them since after expansion they should fit.
final int oldMaxActivityCount = mMaxActivityCount;
mMaxActivityCount = MAX_ACTIVITY_COUNT_UNLIMITED;
int contentWidth = 0;
View itemView = null;
final int widthMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
final int heightMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
final int count = getCount();
for (int i = 0; i < count; i++) {
itemView = getView(i, itemView, null);
itemView.measure(widthMeasureSpec, heightMeasureSpec);
contentWidth = Math.max(contentWidth, itemView.getMeasuredWidth());
}
mMaxActivityCount = oldMaxActivityCount;
return contentWidth;
}
public void setMaxActivityCount(int maxActivityCount) {
if (mMaxActivityCount != maxActivityCount) {
mMaxActivityCount = maxActivityCount;
notifyDataSetChanged();
}
}
public ResolveInfo getDefaultActivity() {
return mDataModel.getDefaultActivity();
}
public void setShowFooterView(boolean showFooterView) {
if (mShowFooterView != showFooterView) {
mShowFooterView = showFooterView;
notifyDataSetChanged();
}
}
public int getActivityCount() {
return mDataModel.getActivityCount();
}
public int getHistorySize() {
return mDataModel.getHistorySize();
}
public boolean getShowHistory() {
return mDataModel.getShowHistory();
}
public int getMaxActivityCount() {
return mMaxActivityCount;
}
public ActivityChooserModel getDataModel() {
return mDataModel;
}
public void setShowDefaultActivity(boolean showDefaultActivity,
boolean highlightDefaultActivity) {
if (mShowDefaultActivity != showDefaultActivity
|| mHighlightDefaultActivity != highlightDefaultActivity) {
mShowDefaultActivity = showDefaultActivity;
mHighlightDefaultActivity = highlightDefaultActivity;
notifyDataSetChanged();
}
}
public boolean getShowDefaultActivity() {
return mShowDefaultActivity;
}
}
}
Raw
ExampleActivity.java
public class JournalEntryActivity extends ActionBarActivity {
private final String[] INTENT_FILTER = new String[] {
"com.twitter.android",
"com.facebook.katana"
};
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.journal_entry_menu, menu);
// Set up ShareActionProvider's default share intent
MenuItem shareItem = menu.findItem(R.id.action_share);
if (shareItem instanceof SupportMenuItem) {
mShareActionProvider = new ShareActionProvider(this);
mShareActionProvider.setShareIntent(ShareUtils.share(mJournalEntry));
mShareActionProvider.setIntentFilter(Arrays.asList(INTENT_FILTER));
mShareActionProvider.setShowHistory(false);
((SupportMenuItem) shareItem).setSupportActionProvider(mShareActionProvider);
}
return super.onCreateOptionsMenu(menu);
}
}
Raw
ShareActionProvider.java
package com.your.package;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.graphics.drawable.Drawable;
import android.support.v4.view.ActionProvider;
import android.support.v7.appcompat.R;
import android.util.TypedValue;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MenuItem.OnMenuItemClickListener;
import android.view.SubMenu;
import android.view.View;
import java.util.List;
/**
* This is a provider for a share action. It is responsible for creating views
* that enable data sharing and also to show a sub menu with sharing activities
* if the hosting item is placed on the overflow menu.
*
* <p class="note"><strong>Note:</strong> This class is included in the <a
* href="{@docRoot}tools/extras/support-library.html">support library</a> for compatibility
* with API level 7 and higher. If you're developing your app for API level 14 and higher
* <em>only</em>, you should instead use the framework {@link android.widget.ShareActionProvider}
* class.</p>
*
* <p>
* Here is how to use the action provider with custom backing file in a {@link MenuItem}:
* </p>
* <pre><code>
* // In {@link android.app.Activity#onCreateOptionsMenu Activity.onCreateOptionsMenu()}
* public boolean onCreateOptionsMenu(Menu menu) {
* // Get the menu item.
* MenuItem menuItem = menu.findItem(R.id.my_menu_item);
* // Get the provider and hold onto it to set/change the share intent.
* mShareActionProvider = (ShareActionProvider) MenuItemCompat.getActionProvider(menuItem);
* // Set history different from the default before getting the action
* // view since a call to {@link android.support.v4.view.MenuItemCompat#getActionView(android.view.MenuItem) MenuItemCompat.getActionView()} calls
* // {@link ActionProvider#onCreateActionView()} which uses the backing file name. Omit this
* // line if using the default share history file is desired.
* mShareActionProvider.setShareHistoryFileName("custom_share_history.xml");
* . . .
* }
*
* // Somewhere in the application.
* public void doShare(Intent shareIntent) {
* // When you want to share set the share intent.
* mShareActionProvider.setShareIntent(shareIntent);
* }
* </code></pre>
* <p>
* <strong>Note:</strong> While the sample snippet demonstrates how to use this provider
* in the context of a menu item, the use of the provider is not limited to menu items.
* </p>
*
* <div class="special reference">
* <h3>Developer Guides</h3>
*
* <p>For information about how to use {@link ShareActionProvider}, see the
* <a href="{@docRoot}guide/topics/ui/actionbar.html#ActionProvider">Action Bar</a> API guide.</p>
* </div>
*
* @see ActionProvider
*/
public class ShareActionProvider extends ActionProvider {
/**
* Listener for the event of selecting a share target.
*/
public interface OnShareTargetSelectedListener {
/**
* Called when a share target has been selected. The client can
* decide whether to perform some action before the sharing is
* actually performed.
* <p>
* <strong>Note:</strong> Modifying the intent is not permitted and
* any changes to the latter will be ignored.
* </p>
* <p>
* <strong>Note:</strong> You should <strong>not</strong> handle the
* intent here. This callback aims to notify the client that a
* sharing is being performed, so the client can update the UI
* if necessary.
* </p>
*
* @param source The source of the notification.
* @param intent The intent for launching the chosen share target.
* @return The return result is ignored. Always return false for consistency.
*/
public boolean onShareTargetSelected(ShareActionProvider source, Intent intent);
}
/**
* The default for the maximal number of activities shown in the sub-menu.
*/
private static final int DEFAULT_INITIAL_ACTIVITY_COUNT = 4;
/**
* The the maximum number activities shown in the sub-menu.
*/
private int mMaxShownActivityCount = DEFAULT_INITIAL_ACTIVITY_COUNT;
/**
* Listener for handling menu item clicks.
*/
private final ShareMenuItemOnMenuItemClickListener mOnMenuItemClickListener =
new ShareMenuItemOnMenuItemClickListener();
/**
* The default name for storing share history.
*/
public static final String DEFAULT_SHARE_HISTORY_FILE_NAME = "share_history.xml";
/**
* Context for accessing resources.
*/
private final Context mContext;
/**
* The name of the file with share history data.
*/
private String mShareHistoryFileName = DEFAULT_SHARE_HISTORY_FILE_NAME;
private OnShareTargetSelectedListener mOnShareTargetSelectedListener;
private ActivityChooserModel.OnChooseActivityListener mOnChooseActivityListener;
/**
* Creates a new instance.
*
* @param context Context for accessing resources.
*/
public ShareActionProvider(Context context) {
super(context);
mContext = context;
}
/**
* Sets a listener to be notified when a share target has been selected.
* The listener can optionally decide to handle the selection and
* not rely on the default behavior which is to launch the activity.
* <p>
* <strong>Note:</strong> If you choose the backing share history file
* you will still be notified in this callback.
* </p>
* @param listener The listener.
*/
public void setOnShareTargetSelectedListener(OnShareTargetSelectedListener listener) {
mOnShareTargetSelectedListener = listener;
setActivityChooserPolicyIfNeeded();
}
/**
* {@inheritDoc}
*/
@Override
public View onCreateActionView() {
// Create the view and set its data model.
ActivityChooserModel dataModel = ActivityChooserModel.get(mContext, mShareHistoryFileName);
ActivityChooserView activityChooserView = new ActivityChooserView(mContext);
activityChooserView.setActivityChooserModel(dataModel);
// Lookup and set the expand action icon.
TypedValue outTypedValue = new TypedValue();
mContext.getTheme().resolveAttribute(R.attr.actionModeShareDrawable, outTypedValue, true);
Drawable drawable = mContext.getResources().getDrawable(outTypedValue.resourceId);
activityChooserView.setExpandActivityOverflowButtonDrawable(drawable);
activityChooserView.setProvider(this);
// Set content description.
activityChooserView.setDefaultActionButtonContentDescription(
R.string.abc_shareactionprovider_share_with_application);
activityChooserView.setExpandActivityOverflowButtonContentDescription(
R.string.abc_shareactionprovider_share_with);
return activityChooserView;
}
/**
* {@inheritDoc}
*/
@Override
public boolean hasSubMenu() {
return true;
}
/**
* {@inheritDoc}
*/
@Override
public void onPrepareSubMenu(SubMenu subMenu) {
// Clear since the order of items may change.
subMenu.clear();
ActivityChooserModel dataModel = ActivityChooserModel.get(mContext, mShareHistoryFileName);
PackageManager packageManager = mContext.getPackageManager();
final int expandedActivityCount = dataModel.getActivityCount();
final int collapsedActivityCount = Math.min(expandedActivityCount, mMaxShownActivityCount);
// Populate the sub-menu with a sub set of the activities.
for (int i = 0; i < collapsedActivityCount; i++) {
ResolveInfo activity = dataModel.getActivity(i);
subMenu.add(0, i, i, activity.loadLabel(packageManager))
.setIcon(activity.loadIcon(packageManager))
.setOnMenuItemClickListener(mOnMenuItemClickListener);
}
if (collapsedActivityCount < expandedActivityCount) {
// Add a sub-menu for showing all activities as a list item.
SubMenu expandedSubMenu = subMenu.addSubMenu(Menu.NONE, collapsedActivityCount,
collapsedActivityCount,
mContext.getString(R.string.abc_activity_chooser_view_see_all));
for (int i = 0; i < expandedActivityCount; i++) {
ResolveInfo activity = dataModel.getActivity(i);
expandedSubMenu.add(0, i, i, activity.loadLabel(packageManager))
.setIcon(activity.loadIcon(packageManager))
.setOnMenuItemClickListener(mOnMenuItemClickListener);
}
}
}
/**
* Sets the file name of a file for persisting the share history which
* history will be used for ordering share targets. This file will be used
* for all view created by {@link #onCreateActionView()}. Defaults to
* {@link #DEFAULT_SHARE_HISTORY_FILE_NAME}. Set to <code>null</code>
* if share history should not be persisted between sessions.
* <p>
* <strong>Note:</strong> The history file name can be set any time, however
* only the action views created by {@link #onCreateActionView()} after setting
* the file name will be backed by the provided file. Therefore, if you want to
* use different history files for sharing specific types of content, every time
* you change the history file {@link #setShareHistoryFileName(String)} you must
* call {@link android.app.Activity#invalidateOptionsMenu()} to recreate the
* action view. You should <strong>not</strong> call
* {@link android.app.Activity#invalidateOptionsMenu()} from
* {@link android.app.Activity#onCreateOptionsMenu(Menu)}."
* <p>
* <code>
* private void doShare(Intent intent) {
* if (IMAGE.equals(intent.getMimeType())) {
* mShareActionProvider.setHistoryFileName(SHARE_IMAGE_HISTORY_FILE_NAME);
* } else if (TEXT.equals(intent.getMimeType())) {
* mShareActionProvider.setHistoryFileName(SHARE_TEXT_HISTORY_FILE_NAME);
* }
* mShareActionProvider.setIntent(intent);
* invalidateOptionsMenu();
* }
* <code>
*
* @param shareHistoryFile The share history file name.
*/
public void setShareHistoryFileName(String shareHistoryFile) {
mShareHistoryFileName = shareHistoryFile;
setActivityChooserPolicyIfNeeded();
}
/**
* Sets an intent with information about the share action. Here is a
* sample for constructing a share intent:
* <p>
* <pre>
* <code>
* Intent shareIntent = new Intent(Intent.ACTION_SEND);
* shareIntent.setType("image/*");
* Uri uri = Uri.fromFile(new File(getFilesDir(), "foo.jpg"));
* shareIntent.putExtra(Intent.EXTRA_STREAM, uri.toString());
* </pre>
* </code>
* </p>
*
* @param shareIntent The share intent.
*
* @see Intent#ACTION_SEND
* @see Intent#ACTION_SEND_MULTIPLE
*/
public void setShareIntent(Intent shareIntent) {
ActivityChooserModel dataModel = ActivityChooserModel.get(mContext,
mShareHistoryFileName);
dataModel.setIntent(shareIntent);
}
public void setIntentFilter(List<String> intentFilter) {
ActivityChooserModel dataModel = ActivityChooserModel.get(mContext,
mShareHistoryFileName);
dataModel.setIntentFilter(intentFilter);
}
public void setShowHistory(boolean showHistory) {
ActivityChooserModel dataModel = ActivityChooserModel.get(mContext,
mShareHistoryFileName);
dataModel.setShowHistory(showHistory);
}
/**
* Reusable listener for handling share item clicks.
*/
private class ShareMenuItemOnMenuItemClickListener implements OnMenuItemClickListener {
@Override
public boolean onMenuItemClick(MenuItem item) {
ActivityChooserModel dataModel = ActivityChooserModel.get(mContext,
mShareHistoryFileName);
final int itemId = item.getItemId();
Intent launchIntent = dataModel.chooseActivity(itemId);
if (launchIntent != null) {
launchIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
mContext.startActivity(launchIntent);
}
return true;
}
}
/**
* Set the activity chooser policy of the model backed by the current
* share history file if needed which is if there is a registered callback.
*/
private void setActivityChooserPolicyIfNeeded() {
if (mOnShareTargetSelectedListener == null) {
return;
}
if (mOnChooseActivityListener == null) {
mOnChooseActivityListener = new ShareActivityChooserModelPolicy();
}
ActivityChooserModel dataModel = ActivityChooserModel.get(mContext, mShareHistoryFileName);
dataModel.setOnChooseActivityListener(mOnChooseActivityListener);
}
/**
* Policy that delegates to the {@link OnShareTargetSelectedListener}, if such.
*/
private class ShareActivityChooserModelPolicy implements ActivityChooserModel.OnChooseActivityListener {
@Override
public boolean onChooseActivity(ActivityChooserModel host, Intent intent) {
if (mOnShareTargetSelectedListener != null) {
mOnShareTargetSelectedListener.onShareTargetSelected(
ShareActionProvider.this, intent);
}
return false;
}
}
}
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