Android 014 - List Listener

android.014.java

//////////////////////////////////////////////////////////////////////////////////////////////
// in MainActivity
//////////////////////////////////////////////////////////////////////////////////////////////
public class MainActivity extends AppCompatActivity {

    private TextView tv;
    private ListView lv;
    private ExpandableListView elv;

    private String[] gruppen = {"Gruppe 1", "Gruppe 2", "Gruppe 3"};
    private String[][] kinder = {
            {"Gruppe 1, Kind 1", "Gruppe 1, Kind 2"},
            {"Gruppe 2, Kind 1", "Gruppe 2, Kind 2", "Gruppe 2, Kind 3"},
            {"Gruppe 3, Kind 1", "Gruppe 3, Kind 2", "Gruppe 3, Kind 3", "Gruppe 3, Kind 4", "Gruppe 3, Kind 5"}
    };



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        tv = findViewById(R.id.tv);
        lv = findViewById(R.id.lv);
        elv = findViewById(R.id.elv);
        
        // Behandlung ListView nur 2 Listener
        lv.setAdapter(new MyListAdapter(this));

        lv.setOnItemClickListener(new myOICL());
        lv.setOnItemLongClickListener(new myOILCL());

        // behandlung ExpandableListView: 6 unterschiedliche Listener
        elv.setAdapter(new MyBELA(this, gruppen, kinder));
        elv.setOnChildClickListener(new myOChildCL());
        elv.setOnGroupClickListener(new myOGroupCL());
        elv.setOnGroupCollapseListener(new myOGCollapseL());
        elv.setOnGroupExpandListener(new myOGExpandL());
        elv.setOnItemClickListener(new myOnELVOICL());
        elv.setOnItemLongClickListener(new myOILCL());
    }

    private class myOICL implements AdapterView.OnItemClickListener {
        /**
         * wird aufgerufen wenn ein item angeklickt wurde
         * @param parent    die ListView in der das Item ist
         * @param view      die angeklickte view
         * @param position  die position
         * @param id        die ID aus dem Adapter
         */
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            //Log.v("XXX", String.format("Position: %d, ID: %d",position,id));
            TextView item = (TextView) view;
            tv.setText(String.format("Text: %s, Position: %d, ID: %d",item.getText().toString(),position,id));
        }
    }

    private class myOILCL implements AdapterView.OnItemLongClickListener {
        /**
         *
         * @param parent    wie oben
         * @param view      wie oben
         * @param position  wie oben
         * @param id        wie oben
         * @return true falls Ereignis abgearbeitet, ansonsten false
         */
        @Override
        public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
            Log.v("XXX", String.format("Position: %d, ID: %d",position,id));
            TextView item = (TextView) view;
            tv.setText(String.format("LONG Text: %s, Position: %d, ID: %d",item.getText().toString(),position,id));

            return false;
        }
    }

    private class myOChildCL implements ExpandableListView.OnChildClickListener {
        @Override
        public boolean onChildClick(ExpandableListView parent, View view,
                                    int groupPosition, int childPosition, long id) {
            Log.v("XXXXX - onChildClick",String.format("g = %d, c = %d, id = %d",
                    groupPosition,childPosition,id));
            return false;
        }
    }

    private class myOGroupCL implements ExpandableListView.OnGroupClickListener {
        @Override
        public boolean onGroupClick(ExpandableListView parent, View view, int groupPosition, long id) {
            Log.v("XXXXX - onGroupClick",String.format("g = %d, id = %d",
                    groupPosition,id));
            return false;
        }
    }

    private class myOGCollapseL implements ExpandableListView.OnGroupCollapseListener {
        @Override
        public void onGroupCollapse(int groupPosition) {
            Log.v("XXXXX - onGroupCollapse",String.format("g = %d",
                    groupPosition));

        }
    }

    private class myOGExpandL implements ExpandableListView.OnGroupExpandListener {
        @Override
        public void onGroupExpand(int groupPosition) {
            Log.v("XXXXX - onGroupExpand",String.format("g = %d",
                    groupPosition));


        }
    }

    private class myOnELVOICL implements AdapterView.OnItemClickListener {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            Log.v("XXX", String.format("Position: %d, ID: %d",position,id));
            TextView item = (TextView) view;
            tv.setText(String.format("XXXXX - onItemClick: %s, Position: %d, ID: %d",item.getText().toString(),position,id));
        }
    }

    private class myOnLONGelvICL implements View.OnLongClickListener {
        @Override
        public boolean onLongClick(View view) {
            return false;
        }
    }
}


//////////////////////////////////////////////////////////////////////////////////////////////
// in MyListAdapter (ListAdapter) fuer die einfache ListView
//////////////////////////////////////////////////////////////////////////////////////////////
public class MyListAdapter implements ListAdapter {

    private ArrayList<String> eintraege;
    private Context context;

    public MyListAdapter(Context context) {
        this.context = context;
        eintraege = new ArrayList<String>();
        for (int i=1;i<=100;i++)
            eintraege.add("Zeileneintrag " +i);
    }

    @Override
    public boolean areAllItemsEnabled() {
        return true;
    }

    @Override
    public boolean isEnabled(int i) {
        return true;
    }

    @Override
    public void registerDataSetObserver(DataSetObserver dataSetObserver) {

    }

    @Override
    public void unregisterDataSetObserver(DataSetObserver dataSetObserver) {

    }

    @Override
    public int getCount() {
        return eintraege.size();
    }

    @Override
    public Object getItem(int position) {
        return eintraege.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }


    // Sind die IDs stabil, also unveränderbar?
    @Override
    public boolean hasStableIds() {
        return false;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup viewGroup) {
        Log.v("XXXXX", "position " + position + ", convertView = " + convertView);

        TextView tv;
        if(convertView == null)
            tv = new TextView(context);
        else
            tv = (TextView) convertView;
        tv.setText(eintraege.get(position));

        return tv;
    }

    // Welche Zeilen Optik soll an der Position verwendet werden?
    // wenn nur eine existiert, nehmen wir 0
    @Override
    public int getItemViewType(int i) {
        return 0;
    }



    // Wie viele verschiedene zeilen-Optiken haben wir?
    @Override
    public int getViewTypeCount() {
        return 1;
    }

    @Override
    public boolean isEmpty() {
        return getCount() == 0;
    }
}

//////////////////////////////////////////////////////////////////////////////////////////////
// in MyBELA (BaseExpandableListAdapter) für die  fuer die komplexere ExpandableListView
//////////////////////////////////////////////////////////////////////////////////////////////
class MyBELA extends BaseExpandableListAdapter{
    private Context     context;
    private String[]    gruppen;
    private String[][]  kinder;

    @Override
    public boolean areAllItemsEnabled() {
        return true;
    }

    public MyBELA(Context context, String[] gruppen, String[][] kinder) {
        this.context = context;
        this.gruppen = gruppen;
        this.kinder = kinder;
    }

    @Override
    public int getGroupCount() {
        return gruppen.length;
    }

    @Override
    public int getChildrenCount(int i) {
        return kinder[i].length;
    }

    @Override
    public Object getGroup(int groupPosition) {
        return gruppen[groupPosition];
    }

    @Override
    public Object getChild(int groupPosition, int childPosition) {
        return kinder[groupPosition][childPosition];
    }

    /**
     * Die eindeutige Gruppen-ID kann irgendwie zusammengebastellt werden
     * Hier haben die Gruppen die Ids
     * @param groupPosition
     * @return
     */
    @Override
    public long getGroupId(int groupPosition) {
        // damit wir nicht mit 0 anfangen, addieren wir 1
        return (groupPosition+1)*10000;
    }

    /**
     * Die eindeutige Child-ID kann irgendwie zusammengebastellt werden
     * 10001,10002,20001,....
     *
     */
    @Override
    public long getChildId(int groupPosition, int childPosition) {
        return (groupPosition+1)*10000 + (childPosition+1);
    }

    @Override
    public boolean hasStableIds() {
        return true;
    }

    @Override
    public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup viewGroup) {
        TextView tv = null;

        if (convertView == null){
            tv = new TextView(context);
            tv.setPadding(10, 0, 0, 5);
            tv.setTextSize(TypedValue.COMPLEX_UNIT_DIP, 25);
        } else {
            tv = (TextView) convertView;
        }

        tv.setText(getGroup(groupPosition).toString());

        return tv;
    }

    @Override
    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup viewGroup) {
        TextView tv = null;

        if (convertView == null) {
            tv = new TextView(context);
            tv.setPadding(25, 0, 0, 5);
            tv.setTextSize(TypedValue.COMPLEX_UNIT_DIP, 15);
        } else {
            tv = (TextView) convertView;
        }

        tv.setText(getChild(groupPosition,childPosition).toString());

        return tv;
    }

    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition) {
        return true;
    }
}