Android ListView滚动剪辑列表中的项目

Question

我试图在listview中使用scrollBy方法并在列表中滚动它，但会通过剪切项目使列表看起来很奇怪。

我尝试使用

等内容刷新列表

l.invalidate();
l.requestLayout();
l.forceLayout();
l.invalidateViews();
l.postInvalidate();
l.refreshDrawableState();

但是没有好结果：我向下滚动150像素后看到图像

数据5下方有更多条目，但它们已被剪裁。

代码：

public class TestListViewScrollActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    final ListView l = (ListView)findViewById(R.id.listView1);
    final MyAdapter adapter = new MyAdapter(getApplicationContext());


    l.setAdapter(adapter);

    l.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
            adapter.add();

            l.scrollBy(0, 150);
            l.invalidate();
            l.requestLayout();
            l.forceLayout();
            l.invalidateViews();
            l.postInvalidate();
            l.refreshDrawableState();
        }
    });

}
}

class MyAdapter extends BaseAdapter {

ArrayList data = new ArrayList();
Context context;

public MyAdapter(Context context) {
    data.add("data1");
    data.add("data2");
    data.add("data3");
    data.add("data4");
    data.add("data5");
    data.add("data6");
    data.add("data7");
    data.add("data8");
    data.add("data9");
    this.context = context;
}

public void add() {
    //data.add(0, "new data");
    //notifyDataSetInvalidated();
    notifyDataSetChanged();

}

@Override
public int getCount() {
    // TODO Auto-generated method stub
    return data.size();
}

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

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

@Override
public View getView(int position, View convertView, ViewGroup parent) {

    View v;
     if (convertView == null) {
         LayoutInflater vi = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
         v = vi.inflate(R.layout.listitem, null);

     } else {
         v = convertView;

     }
     TextView text = (TextView) v.findViewById(R.id.text);
        text.setText((String)data.get(position));
 return v;
}





}

Answer 1

解决方法是不使用scrollBy但

l.setSelectionFromTop(l.getFirstVisiblePosition() + 1, l.getChildAt(0).getTop() + 150);

请参阅Maintain/Save/Restore scroll position when returning to a ListView

Answer 2

adapter.notifyDataSetChanged();

Answer 3

对我来说，joyne的答案适用于普通的列表视图，但是对于那些带有大量标题的应用程序失败了，因此我使用了这个甚至可以用于大量标题的文件

console.log(this[privateVar1], this[privateVar2])