更新列表视图？

Question

如何更新我的列表视图，每次我将图像添加到 SD 卡时它都没有显示我需要再次运行我的应用程序才能看到这些图片。能帮帮我吗谢谢

@Override
  protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.acmain);

    sharedpreferences = this.getSharedPreferences(MyPREFERENCES,
            Context.MODE_PRIVATE);
    frameChooserGV = (ListView) findViewById(R.id.listview);
    utils = new UtilsList(ListViewImage.this.getApplicationContext());
    InitializeGridLayout();
    framePaths = utils.getFilePaths();
    frameChooserAdapter = new ListViewImageAdapter(
            ListViewImage.this.getApplicationContext(), framePaths,
            columnWidth);
    frameChooserAdapter.notifyDataSetChanged();
    frameChooserGV.setAdapter(frameChooserAdapter);
    frameChooserGV.setOnItemClickListener(this);
}

public void InitializeGridLayout() {
    Resources r = getResources();
    float padding = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
            AppConstant.GRID_PADDING, r.getDisplayMetrics());
    columnWidth = (int) ((utils.getScreenWidth() - ((AppConstant.NUM_OF_COLUMNS + 1) * padding)) / AppConstant.NUM_OF_COLUMNS);
}

@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
        long id) {
    // TODO Auto-generated method stub
    Log.e("" + frameChooserGV.getPositionForView(view), "" + position);
    Intent b_intent = new Intent(getApplicationContext(),
            com.example.customize.CustomizeNumberDisplay.class);
    b_intent.putExtra("position", position);
    startActivity(b_intent);

}

Answer 1

一旦您修改了该适配器中的数据，您需要对该适配器对象调用 notifyDataSetChanged()。

来源：How to refresh Android listview?

还有：

Android ListView not refreshing after notifyDataSetChanged

Answer 2

使用这个

myListView.invalidateViews(); in on Resume method, this will help to create view Again in listview android. Or also Call notifyDataSetChanged(); on your Adapter

希望这会有所帮助

更新列表视图？

Update listview?

android

image

listview