listview 根据选择打开警报对话框 android

Question

我拼命地试图让我的 listView 打开一个警报对话框或一个充满信息的普通对话框。我似乎无法让它发挥作用。我希望它根据单击列表中的哪个项目来显示不同的信息

public class learn_tab1 extends ListActivity {

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setListAdapter(new ArrayAdapter<String>(this, R.layout.list_item,
            BASICLIST));

    ListView lv = getListView();
    lv.setTextFilterEnabled(true);

    lv.setOnItemClickListener(new OnItemClickListener() {
        public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) {
                    AlertDialog dialog = new AlertDialog.Builder(this).create();

    dialog.setCancelable(false);
    dialog.setTitle("Instructions");
    dialog.setIcon(R.drawable.bone_icon);
    dialog.setMessage("test");
    dialog.setButton(DialogInterface.BUTTON_POSITIVE, "Done", new DialogInterface.OnClickListener() {


        @Override
        public void onClick(DialogInterface dialog, int which) {
            // TODO Auto-generated method stub
            finish();
        }
    });
    dialog.show();
            }
        }
    });
}

Answer 1

尝试 new AlertDialog.Builder(learn_tab1.this).create();而不是 new AlertDialog.Builder(this).create()。

我想知道它是如何得到遵守的......

编辑

public void onItemClick(AdapterView<?> parent, View view, int position, long id) {   
    String item = (String)parent.getItemAtPosition(position);

    // ...
    dialog.setMessage(item);

    // ...
}