java - Android - findViewWtihTag 返回 null

Question

此 Activity 中的 findViewWithTag 返回 null，但 CustomExpandableListAdapter 中的日志输出正确。我在这里做错了什么？

public class CustomExpandableListAdapter extends BaseExpandableListAdapter {

//normal stuff

public View getGroupView(int groupPosition, boolean isLastChild,
View view, ViewGroup parent) {

    CustomObject group = (CustomObject) getGroup(groupPosition);
    //normal stuff

    LinearLayout toggle = (LinearLayout) view.findViewById(R.id.toggle);
//group.getId() returns an int
    toggle.setTag("toggle" + group.getId());
    Log.i("BBBBBtoggleadapterBBBBBB", toggle.getTag().toString());


    return view;
}


}



public class MainActivity extends BaseListActivity {

//normal stuff

//this is an xml onClick
public void toggleView(View view) {

  String groupId = view.getTag().toString();
  //LinearLayout toggle = (LinearLayout) view.findViewWithTag("toggle " + groupId);
   Log.i("BBBBBBBBBtoggleactivityBBBBBBBBBB", "toggle" + groupId);

    /*if (toggle == null) {
    Toast.makeText(getBaseContext(), "null", Toast.LENGTH_LONG).show();
    }*/

}

}

编辑:更新代码，在 Activity 和适配器中记录“toggle”+ id，它们是相同的

Answer 1

我明白了。 findViewWithTag 查找匹配的子标签。我试图识别的 LinearLayout 不是 onClick 触发的toggleView 按钮的子级。因此，我需要向上(在本例中为 2 层)才能找到它。

View parent = (View) view.getParent().getParent();
LinearLayout toggle = (LinearLayout) parent.findViewWithTag("toggle" + groupId);