mindwing

interface AsyncOperator<P, R> {
  Cancellable request(P param, Callback<R> callback);
}

interface Callback<R> {
  void onResponse(R response); // Can be called from any thread
}

interface Cancellable {
  void cancel();

mindwing

public class AsyncOperatorRepository<P, R> extends BaseObservable
    implements Repository<Result<R>>, Callback<R> {

  private final AsyncOperator<P, R> asyncOperator;
  private final Supplier<P> paramSupplier;

  private Result<R> result;
  private Cancellable cancellable;

  public AsyncOperatorRepository(AsyncOperator<P, R> asyncOperator,

mindwing

public class AsyncOperatorRepository<P, R> extends BaseObservable
    implements Repository<Result<R>>, Callback<R>, Updatable {

  private final AsyncOperator<P, R> asyncOperator;
  private final Repository<P> paramRepository;

  private Result<R> result;
  private Cancellable cancellable;

  public AsyncOperatorRepository(AsyncOperator<P, R> asyncOperator,

mindwing

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:paddingBottom="@dimen/activity_vertical_margin"
   android:paddingLeft="@dimen/activity_horizontal_margin"
   android:paddingRight="@dimen/activity_horizontal_margin"
   android:paddingTop="@dimen/activity_vertical_margin"
   tools:context="kr.mindwing.helloworld.MainActivity">

mindwing

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"

mindwing

System directories

Method	Result
Environment.getDataDirectory()	/data
Environment.getDownloadCacheDirectory()	/cache
Environment.getRootDirectory()	/system

External storage directories