Question

嗨我有列表视图中的六个项目，但是当我在事件上调用alet函数时它不起作用？让我知道如何在点击项目事件上编写函数？

     public class PhotoListView extends ListActivity {
     String[] listItems = {"HeadShot", "BodyShot ", "ExtraShot", "Video Take1", "Video Take2", "Video Take3", }; 
    @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.main);
         setListAdapter(new ArrayAdapter(this,android.R.layout.simple_list_item_1, listItems));
     }

OnListclick

  ListView Shot = getListView();
  protected void onListItemClick(View view) {

    if(view == Shot){

        AlertDialog.Builder alertbox = new AlertDialog.Builder(this);

        // set the message to display
          alertbox.setMessage("Please Get Ready");

    }

Answer 1

ListView Shot = getListView();

在Shot中，您拥有列表视图的ID，而不是列表中的每个项目。

    @Override
    protected void onListItemClick(ListView l, View v, int position, long id) {
        // TODO Auto-generated method stub
        super.onListItemClick(l, v, position, id);

 AlertDialog.Builder alertbox = new AlertDialog.Builder(this);

        // set the message to display
          alertbox.setMessage("Please Get Ready").show();

    }

或者您可以使用ListView :: setOnItemClickListener

public class PhotoListView extends ListActivity implements OnItemClickListener


ListView shot = getListView();
        shot.setOnItemClickListener(this);


@Override
    public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
        AlertDialog.Builder alertbox = new AlertDialog.Builder(this);

    // set the message to display
      alertbox.setMessage("Please Get Ready").show();


    }

如何在Android中为ListView编写onclick事件？

1 个答案: