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我正在嘗試在我爲學習目的而編寫的某些代碼中使用SimpleCursorTreeAdapter。正在發生的事情是，當我點擊父母時，它會展開並展示孩子，但是我再也無法做任何事了。我使用調試器來執行代碼，並發現我被困在looper.loop中的一個永無止境的循環中。我已經評論了所有在下面的代碼段中實際工作的東西，但它仍然掛起。通過下面的代碼片斷，我預計點擊第二個父代會導致它擴大（如箭頭更改所示）。 我在代碼中留下了舊的東西（但註釋掉了）以顯示我正在嘗試做的事情。Android SimpleCursorTreeAdapter Hanging
我真的很感激任何意見或建議。
private void showEvents(final Cursor cursor) {
ExpandableListView lv1 = this.getExpandableListView();
SimpleCursorTreeAdapter adapter = new SimpleCursorTreeAdapter (this, cursor, R.layout.simplerow, FROM, TO,
R.layout.childrow, FROMCHILD, TOCHILD) {
//@Override
//public void setViewText(TextView v, String text) {
// super.setViewText(v, convText(v, text, cursor));
//}
@Override
protected Cursor getChildrenCursor(Cursor parentCursor) {
int groupPos = parentCursor.getPosition();
Log.d("TEST", "getChildrenCursor() for groupPos " + groupPos);
String sql = "select f._id, f.NAME as ASSETCLASS, "
+ "f.value as AMOUNT, "
+ "0 as PERCENTAGE, "
+ "0 as TARGET "
+ "from funds f "
+ "where f.asset_class = " + parentCursor.getInt(0) + ";";
sql = "select f._id, f.NAME as FUNDNAME, "
+ "f.value as AMOUNT_OWNED "
+ "from funds f "
+ "where 1 = 1;";
Log.d("TEST", sql);
//SQLiteDatabase db = pfdata.getReadableDatabase();
//Cursor cursor = db.rawQuery(sql, null);
//startManagingCursor(cursor);
//return cursor;
//Log.d("TEST", Integer.toString(cursor.getCount()));
//return cursor;
return null;
}
};
// Log.d("TEST", Integer.toString(adapter.getCount()));
lv1.setAdapter(adapter);
}
我試過這個建議，但是我沒有看到行爲有任何變化。以下是我目前有：
private void showEvents(final Cursor cursor) {
ExpandableListView lv1 = this.getExpandableListView();
MyExpandableListAdapter mAdapter = new MyExpandableListAdapter(cursor, this,
R.layout.simplerow, R.layout.childrow,
FROM, TO,
FROMCHILD, TOCHILD);
lv1.setAdapter(mAdapter);
}
public class MyExpandableListAdapter extends SimpleCursorTreeAdapter {
public MyExpandableListAdapter(Cursor cursor, Context context,
int groupLayout, int childLayout, String[] groupFrom,
int[] groupTo, String[] childrenFrom, int[] childrenTo) {
super(context, cursor, groupLayout, groupFrom, groupTo,
childLayout, childrenFrom, childrenTo);
}
@Override
protected Cursor getChildrenCursor(Cursor parentCursor) {
String sql = "select f._id, f.NAME as ASSETCLASS, "
+ "f.value as AMOUNT, "
+ "0 as PERCENTAGE, "
+ "0 as TARGET "
+ "from funds f "
+ "where f.asset_class = " + parentCursor.getInt(0) + ";";
Log.d("TEST", sql);
return null;
}
我試圖與實際運行查詢並返回遊標，但它並沒有區別，所以我想回去的基本知識。 如果有人對發生了什麼有什麼想法，我將不勝感激。