Y.A.M の雑記帳: Android　SimpleCursorTreeAdapter を使う

1段のリストを作る ListView 用の Adapter として、 Object配列やリストをひもづける SimpleAdapter やデータベースを検索して得られる Cursor をひもづける SimpleCursorAdapter などがあります。

同じように、2段のリストを作る ExpandableListView 用の Adapter として、Object の配列やリストをひもづける SimpleExpandableListAdapter というのがあります。実は、Cursor データを ExpandableListView にひもづけるための実装クラスの Adapter はありません。変わりに抽象クラスの SimpleCursorTreeAdapter というものがあります。

# SimpleExpandableListAdapter の使い方は API Demos の ExpandableList3.java がわかりやすいです。

このクラスを継承した実装クラスを作って利用します。

view plain print ?

public class SimpleCursorTreeAdapterSampleActivity extends ExpandableListActivity {
private static final String[] CONTACTS_PROJECTION = new String[] {
Contacts._ID,
Contacts.DISPLAY_NAME
};
private static final int GROUP_ID_COLUMN_INDEX = 0;
private static final String[] PHONE_PROJECTION = new String[] {
Phone._ID,
Phone.TYPE,
Phone.NUMBER
};
public class ExpandableListAdapter extends SimpleCursorTreeAdapter {
public ExpandableListAdapter(Context context, Cursor c,
int groupLayout, String[] groupFrom, int[] groupTo,
int childLayout, String[] childrenFrom,int[] childrenTo) {
super(context, c, groupLayout, groupFrom, groupTo,
childLayout, childrenFrom, childrenTo);
}
@Override
protected Cursor getChildrenCursor(Cursor groupCursor) {
Uri.Builder builder = Contacts.CONTENT_URI.buildUpon();
ContentUris.appendId(builder, groupCursor.getLong(GROUP_ID_COLUMN_INDEX));
builder.appendEncodedPath(Contacts.Data.CONTENT_DIRECTORY);
Uri phoneNumbersUri = builder.build();
Cursor c = getContentResolver().query(phoneNumbersUri, PHONE_PROJECTION, Phone.MIMETYPE + "=?", new String[] { Phone.CONTENT_ITEM_TYPE}, null);
startManagingCursor(c);
return c;
}
}
private SimpleCursorTreeAdapter mAdapter;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Cursor c = getContentResolver().query(Contacts.CONTENT_URI, CONTACTS_PROJECTION,
Contacts.HAS_PHONE_NUMBER + "=1", null, null);
mAdapter = new ExpandableListAdapter(
this, c,
android.R.layout.simple_expandable_list_item_1,
new String[] { Contacts.DISPLAY_NAME },
new int[] { android.R.id.text1 },
android.R.layout.simple_expandable_list_item_1,
new String[] { Phone.NUMBER },
new int[] { android.R.id.text1 });
startManagingCursor(c);
setListAdapter(mAdapter);
}
}


public class SimpleCursorTreeAdapterSampleActivity extends ExpandableListActivity {

    private static final String[] CONTACTS_PROJECTION = new String[] {
        Contacts._ID,
        Contacts.DISPLAY_NAME
    };
    
    private static final int GROUP_ID_COLUMN_INDEX = 0;
    
    private static final String[] PHONE_PROJECTION = new String[] {
        Phone._ID,
        Phone.TYPE,
        Phone.NUMBER
    };

    public class ExpandableListAdapter extends SimpleCursorTreeAdapter {

        public ExpandableListAdapter(Context context, Cursor c,
                int groupLayout, String[] groupFrom, int[] groupTo, 
                int childLayout, String[] childrenFrom,int[] childrenTo) {

            super(context, c, groupLayout, groupFrom, groupTo, 
                    childLayout, childrenFrom, childrenTo);
        }

        @Override
        protected Cursor getChildrenCursor(Cursor groupCursor) {
            Uri.Builder builder = Contacts.CONTENT_URI.buildUpon();
            ContentUris.appendId(builder, groupCursor.getLong(GROUP_ID_COLUMN_INDEX));
            builder.appendEncodedPath(Contacts.Data.CONTENT_DIRECTORY);
            Uri phoneNumbersUri = builder.build();
            
            Cursor c = getContentResolver().query(phoneNumbersUri, PHONE_PROJECTION, Phone.MIMETYPE + "=?", new String[] { Phone.CONTENT_ITEM_TYPE}, null);
            startManagingCursor(c);
            return c;
        }
    }
    
    private SimpleCursorTreeAdapter mAdapter;
    
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        Cursor c = getContentResolver().query(Contacts.CONTENT_URI, CONTACTS_PROJECTION, 
                Contacts.HAS_PHONE_NUMBER + "=1", null, null);

        mAdapter = new ExpandableListAdapter(
                this, c,
                android.R.layout.simple_expandable_list_item_1,
                new String[] { Contacts.DISPLAY_NAME }, 
                new int[] { android.R.id.text1 },
                android.R.layout.simple_expandable_list_item_1,
                new String[] { Phone.NUMBER },
                new int[] { android.R.id.text1 });
        
        startManagingCursor(c);
        
        setListAdapter(mAdapter);
    }
}

SimpleCursorTreeAdapter にも SimpleCursorAdapter 同様 ViewBinder を設定して表示方法を変更することができます。

view plain print ?

public class SimpleCursorTreeAdapterSampleActivity extends ExpandableListActivity {
private static final String[] CONTACTS_PROJECTION = new String[] {
Contacts._ID,
Contacts.DISPLAY_NAME
};
private static final int GROUP_ID_COLUMN_INDEX = 0;
private static final String[] PHONE_PROJECTION = new String[] {
Phone._ID,
Phone.TYPE,
Phone.NUMBER
};
private static final int[] COLOR_LIST = new int[] {
Color.parseColor("#002A42"),
Color.parseColor("#3DC3EA"),
Color.parseColor("#99417B"),
Color.parseColor("#F2AE30"),
Color.parseColor("#F2D338"),
};
public class ExpandableListAdapter extends SimpleCursorTreeAdapter {
public ExpandableListAdapter(Context context, Cursor c,
int groupLayout, String[] groupFrom, int[] groupTo,
int childLayout, String[] childrenFrom,int[] childrenTo) {
super(context, c, groupLayout, groupFrom, groupTo,
childLayout, childrenFrom, childrenTo);
}
@Override
protected Cursor getChildrenCursor(Cursor groupCursor) {
Uri.Builder builder = Contacts.CONTENT_URI.buildUpon();
ContentUris.appendId(builder, groupCursor.getLong(GROUP_ID_COLUMN_INDEX));
builder.appendEncodedPath(Contacts.Data.CONTENT_DIRECTORY);
Uri phoneNumbersUri = builder.build();
Cursor c = getContentResolver().query(phoneNumbersUri, PHONE_PROJECTION, Phone.MIMETYPE + "=?", new String[] { Phone.CONTENT_ITEM_TYPE}, null);
startManagingCursor(c);
return c;
}
}
private SimpleCursorTreeAdapter mAdapter;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Cursor c = getContentResolver().query(Contacts.CONTENT_URI, CONTACTS_PROJECTION,
Contacts.HAS_PHONE_NUMBER + "=1", null, null);
mAdapter = new ExpandableListAdapter(
this, c,
android.R.layout.simple_expandable_list_item_1,
new String[] { Contacts.DISPLAY_NAME },
new int[] { android.R.id.text1 },
android.R.layout.simple_expandable_list_item_2,
new String[] { Phone.TYPE, Phone.NUMBER },
new int[] { android.R.id.text1, android.R.id.text2 });
mAdapter.setViewBinder(new SimpleCursorTreeAdapter.ViewBinder() {
public boolean setViewValue(View view, Cursor cursor, int columnIndex) {
if (cursor.getColumnName(columnIndex).equals(Phone.TYPE)) {
int type = cursor.getInt(columnIndex);
String text = (String) Phone.getTypeLabel(getResources(), type, null);
((TextView) view).setText(text);
((TextView) view).setTextColor(COLOR_LIST[type % 5]);
return true;
}
return false;
}
});
startManagingCursor(c);
setListAdapter(mAdapter);
}
}


public class SimpleCursorTreeAdapterSampleActivity extends ExpandableListActivity {

    private static final String[] CONTACTS_PROJECTION = new String[] {
        Contacts._ID,
        Contacts.DISPLAY_NAME
    };
    
    private static final int GROUP_ID_COLUMN_INDEX = 0;
    
    private static final String[] PHONE_PROJECTION = new String[] {
        Phone._ID,
        Phone.TYPE,
        Phone.NUMBER
    };

    private static final int[] COLOR_LIST = new int[] {
        Color.parseColor("#002A42"),
        Color.parseColor("#3DC3EA"),
        Color.parseColor("#99417B"),
        Color.parseColor("#F2AE30"),
        Color.parseColor("#F2D338"),
    };

    public class ExpandableListAdapter extends SimpleCursorTreeAdapter {

        public ExpandableListAdapter(Context context, Cursor c,
                int groupLayout, String[] groupFrom, int[] groupTo, 
                int childLayout, String[] childrenFrom,int[] childrenTo) {

            super(context, c, groupLayout, groupFrom, groupTo, 
                    childLayout, childrenFrom, childrenTo);
        }

        @Override
        protected Cursor getChildrenCursor(Cursor groupCursor) {
            Uri.Builder builder = Contacts.CONTENT_URI.buildUpon();
            ContentUris.appendId(builder, groupCursor.getLong(GROUP_ID_COLUMN_INDEX));
            builder.appendEncodedPath(Contacts.Data.CONTENT_DIRECTORY);
            Uri phoneNumbersUri = builder.build();
            
            Cursor c = getContentResolver().query(phoneNumbersUri, PHONE_PROJECTION, Phone.MIMETYPE + "=?", new String[] { Phone.CONTENT_ITEM_TYPE}, null);
            startManagingCursor(c);
            return c;
        }
    }
    
    private SimpleCursorTreeAdapter mAdapter;
    
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        Cursor c = getContentResolver().query(Contacts.CONTENT_URI, CONTACTS_PROJECTION, 
                Contacts.HAS_PHONE_NUMBER + "=1", null, null);

        mAdapter = new ExpandableListAdapter(
                this, c,
                android.R.layout.simple_expandable_list_item_1,
                new String[] { Contacts.DISPLAY_NAME },
                new int[] { android.R.id.text1 },
                android.R.layout.simple_expandable_list_item_2,
                new String[] { Phone.TYPE, Phone.NUMBER },
                new int[] { android.R.id.text1, android.R.id.text2 });
        
        mAdapter.setViewBinder(new SimpleCursorTreeAdapter.ViewBinder() {
            
            public boolean setViewValue(View view, Cursor cursor, int columnIndex) {
                if (cursor.getColumnName(columnIndex).equals(Phone.TYPE)) {
                    int type = cursor.getInt(columnIndex);
                    String text = (String) Phone.getTypeLabel(getResources(), type, null);
                    
                    ((TextView) view).setText(text);
                    ((TextView) view).setTextColor(COLOR_LIST[type % 5]);
                    return true;
                }
                return false;
            }
        });
        
        startManagingCursor(c);
        
        setListAdapter(mAdapter);
    }
}

Y.A.M の雑記帳: Android　AsyncQueryHandler を使う - でも触れたように、UI スレッドで Cursor を取得するためのクエリを走らせると UI スレッドをブロックしていまいます。それを避けるために SimpleCursorTreeAdapter に対しても AsyncQueryHandler を使うようにすることができます。

view plain print ?

public class AsyncQuerySimpleCursorTreeAdapterSampleActivity extends ExpandableListActivity {
private static final String[] CONTACTS_PROJECTION = new String[] {
Contacts._ID,
Contacts.DISPLAY_NAME
};
private static final int GROUP_ID_COLUMN_INDEX = 0;
private static final String[] PHONE_PROJECTION = new String[] {
Phone._ID,
Phone.TYPE,
Phone.NUMBER
};
private static final int[] COLOR_LIST = new int[] {
Color.parseColor("#002A42"),
Color.parseColor("#3DC3EA"),
Color.parseColor("#99417B"),
Color.parseColor("#F2AE30"),
Color.parseColor("#F2D338"),
};
private static final int TOKEN_GROUP = 0;
private static final int TOKEN_CHILD = 1;
private static final class QueryHandler extends AsyncQueryHandler {
private CursorTreeAdapter mAdapter;
public QueryHandler(Context context, CursorTreeAdapter adapter) {
super(context.getContentResolver());
this.mAdapter = adapter;
}
@Override
protected void onQueryComplete(int token, Object cookie, Cursor cursor) {
switch (token) {
case TOKEN_GROUP:
mAdapter.setGroupCursor(cursor);
break;
case TOKEN_CHILD:
int groupPosition = (Integer) cookie;
mAdapter.setChildrenCursor(groupPosition, cursor);
break;
}
}
}
public class ExpandableListAdapter extends SimpleCursorTreeAdapter {
public ExpandableListAdapter(Context context,
int groupLayout, int childLayout,
String[] groupFrom, int[] groupTo,
String[] childrenFrom,int[] childrenTo) {
super(context, null, groupLayout, groupFrom, groupTo,
childLayout, childrenFrom, childrenTo);
}
@Override
protected Cursor getChildrenCursor(Cursor groupCursor) {
Uri.Builder builder = Contacts.CONTENT_URI.buildUpon();
ContentUris.appendId(builder, groupCursor.getLong(GROUP_ID_COLUMN_INDEX));
builder.appendEncodedPath(Contacts.Data.CONTENT_DIRECTORY);
Uri phoneNumbersUri = builder.build();
mQueryHandler.startQuery(TOKEN_CHILD, groupCursor.getPosition(), phoneNumbersUri,
PHONE_PROJECTION, Phone.MIMETYPE + "=?",
new String[] { Phone.CONTENT_ITEM_TYPE }, null);
return null;
}
}
private QueryHandler mQueryHandler;
private SimpleCursorTreeAdapter mAdapter;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mAdapter = new ExpandableListAdapter(
this,
android.R.layout.simple_expandable_list_item_1,
android.R.layout.simple_expandable_list_item_2,
new String[] { Contacts.DISPLAY_NAME },
new int[] { android.R.id.text1 },
new String[] { Phone.TYPE, Phone.NUMBER },
new int[] { android.R.id.text1, android.R.id.text2 });
mAdapter.setViewBinder(new SimpleCursorTreeAdapter.ViewBinder() {
public boolean setViewValue(View view, Cursor cursor, int columnIndex) {
if (cursor.getColumnName(columnIndex).equals(Phone.TYPE)) {
int type = cursor.getInt(columnIndex);
String text = (String) Phone.getTypeLabel(getResources(), type, null);
((TextView) view).setText(text);
((TextView) view).setTextColor(COLOR_LIST[type % 5]);
return true;
}
return false;
}
});
setListAdapter(mAdapter);
mQueryHandler = new QueryHandler(this, mAdapter);
mQueryHandler.startQuery(TOKEN_GROUP, null, Contacts.CONTENT_URI,
CONTACTS_PROJECTION, Contacts.HAS_PHONE_NUMBER + "=1", null, null);
}
@Override
protected void onDestroy() {
super.onDestroy();
mAdapter.changeCursor(null);
mAdapter = null;
}
}


public class AsyncQuerySimpleCursorTreeAdapterSampleActivity extends ExpandableListActivity {

    private static final String[] CONTACTS_PROJECTION = new String[] {
        Contacts._ID,
        Contacts.DISPLAY_NAME
    };
    
    private static final int GROUP_ID_COLUMN_INDEX = 0;
    
    private static final String[] PHONE_PROJECTION = new String[] {
        Phone._ID,
        Phone.TYPE,
        Phone.NUMBER
    };

    private static final int[] COLOR_LIST = new int[] {
        Color.parseColor("#002A42"),
        Color.parseColor("#3DC3EA"),
        Color.parseColor("#99417B"),
        Color.parseColor("#F2AE30"),
        Color.parseColor("#F2D338"),
    };
    
    private static final int TOKEN_GROUP = 0;
    private static final int TOKEN_CHILD = 1;

    
    private static final class QueryHandler extends AsyncQueryHandler {
        private CursorTreeAdapter mAdapter;

        public QueryHandler(Context context, CursorTreeAdapter adapter) {
            super(context.getContentResolver());
            this.mAdapter = adapter;
        }

        @Override
        protected void onQueryComplete(int token, Object cookie, Cursor cursor) {
            switch (token) {
            case TOKEN_GROUP:
                mAdapter.setGroupCursor(cursor);
                break;

            case TOKEN_CHILD:
                int groupPosition = (Integer) cookie;
                mAdapter.setChildrenCursor(groupPosition, cursor);
                break;
            }
        }
    }
    
    public class ExpandableListAdapter extends SimpleCursorTreeAdapter {

        public ExpandableListAdapter(Context context, 
                int groupLayout, int childLayout, 
                String[] groupFrom, int[] groupTo, 
                String[] childrenFrom,int[] childrenTo) {

            super(context, null, groupLayout, groupFrom, groupTo, 
                    childLayout, childrenFrom, childrenTo);
        }

        @Override
        protected Cursor getChildrenCursor(Cursor groupCursor) {
            Uri.Builder builder = Contacts.CONTENT_URI.buildUpon();
            ContentUris.appendId(builder, groupCursor.getLong(GROUP_ID_COLUMN_INDEX));
            builder.appendEncodedPath(Contacts.Data.CONTENT_DIRECTORY);
            Uri phoneNumbersUri = builder.build();

            mQueryHandler.startQuery(TOKEN_CHILD, groupCursor.getPosition(), phoneNumbersUri, 
                    PHONE_PROJECTION, Phone.MIMETYPE + "=?", 
                    new String[] { Phone.CONTENT_ITEM_TYPE }, null);

            return null;
        }
    }
    
    private QueryHandler mQueryHandler;
    private SimpleCursorTreeAdapter mAdapter;
    
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        mAdapter = new ExpandableListAdapter(
                this, 
                android.R.layout.simple_expandable_list_item_1,
                android.R.layout.simple_expandable_list_item_2,
                new String[] { Contacts.DISPLAY_NAME },
                new int[] { android.R.id.text1 },
                new String[] { Phone.TYPE, Phone.NUMBER },
                new int[] { android.R.id.text1, android.R.id.text2 });
        
        mAdapter.setViewBinder(new SimpleCursorTreeAdapter.ViewBinder() {
            
            public boolean setViewValue(View view, Cursor cursor, int columnIndex) {
                if (cursor.getColumnName(columnIndex).equals(Phone.TYPE)) {
                    int type = cursor.getInt(columnIndex);
                    String text = (String) Phone.getTypeLabel(getResources(), type, null);
                    
                    ((TextView) view).setText(text);
                    ((TextView) view).setTextColor(COLOR_LIST[type % 5]);
                    return true;
                }
                return false;
            }
        });
        
        setListAdapter(mAdapter);

        mQueryHandler = new QueryHandler(this, mAdapter);
        mQueryHandler.startQuery(TOKEN_GROUP, null, Contacts.CONTENT_URI, 
                CONTACTS_PROJECTION, Contacts.HAS_PHONE_NUMBER + "=1", null, null);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        mAdapter.changeCursor(null);
        mAdapter = null;
    }
}