Question

我想在单击listItem时更改listItem的值。我已经提供了以下代码。

public class MyListDialogExampleActivity extends Activity implements OnItemClickListener {

ListView myListView;
String itemString = null;   
String [] listViewArray = new String[] {"ABC", "DEF", "GHI", "JKL"};
MyArrayAdapter listAdapter;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    myListView = (ListView) findViewById (R.id.myListView);
    listAdapter = new MyArrayAdapter(this, R.layout.list_row, R.id.list_tv, listViewArray);

    myListView.setAdapter(listAdapter);
    myListView.setOnItemClickListener(this);

}
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
    // TODO Auto-generated method stub
    Log.d("onItemClick", arg2+"");
    String str = showListDialog();

    // i want to change the selected list item with String str

}

public String showListDialog () {
    final CharSequence[] items = {"1", "2", "3", "4"};

    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setTitle("Pick a number");
    builder.setItems(items, new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int item) {
            itemString = items[item].toString();
        }
    });
    AlertDialog alert = builder.create();
    alert.show();
    return itemString;

}    
  }

Answer 1

您无法在运行时更改数组

所以你必须使用List（http://developer.android.com/reference/java/util/List.html）

Answer 2

你需要在onItemClick上使用发送给你的参数，这样你就可以在你使用的数组中取第i个元素，改变它的值，最后通知适配器使用notifyDatasetChanged更改了数据。

更改ListItem onItemClick的值

2 个答案: