Question

我正在使用Android Developer中的代码来显示ActionBar，但我无法让它工作。如果我点击在ActionBar上的图标上没有响应，但单击文本BACK（在这种情况下）工作;然而从xml文件中删除图标行（如下）一切正常！那么我怎么能纠正这个呢？这是res / menu / main_activity_actions.xml：

<menu xmlns:android="http://schemas.android.com/apk/res/android" >
<!-- Search, should appear as action button -->
<item android:id="@+id/action_help"
      android:icon="@drawable/ic_action_help"
      android:title="@string/action_help"
      android:showAsAction="ifRoom" />
<item android:id="@+id/action_back"
      android:title="@string/action_back"
      android:showAsAction="ifRoom" />
</menu>

删除＆＃34;图标=＆＃34;行修复了一些事情，但我希望显示图标。 MainActivity（仅响应 to action_back clicked）和strings.xml文件如下所示：

 @Override
 public boolean onOptionsItemSelected(MenuItem item) {
    int id = item.getItemId();
    switch(id){
        case R.id.action_help :
            Toast.makeText(this, "Help clicked", Toast.LENGTH_SHORT).show();
            return true;
        case R.id.action_back :
            Toast.makeText(this, "Back clicked", Toast.LENGTH_SHORT).show();
            return true;
        default :
            return super.onOptionsItemSelected(item);
    }
 }

 <resources>
     <string name="action_help">Help</string>
     <string name="action_back">Back</string>
 </resources>

Answer 1

You have to include both this in your menu.xml file

appcompat v7
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"  

appcompat v7+
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:android="http://schemas.android.com/apk/res-auto"

Answer 2

Use this code instead of yours and check whether its working or not.
Hope it works.   

 @Override
     public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();
        switch(id){
            case R.id.action_help :
                Toast.makeText(this, "Help clicked", Toast.LENGTH_SHORT).show();
              break;
            case R.id.action_back :
                Toast.makeText(this, "Back clicked", Toast.LENGTH_SHORT).show();
               break;


        }
     return super.onOptionsItemSelected(item);
     }

单击ActionBar中的图标无法执行任何操作

2 个答案: