Android中PopupMenu组件的使用实例

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">

 <item
  android:id="@+id/next"
  android:icon="@mipmap/ic_launcher"
  android:title="下一首播放"/>

 <item
  android:id="@+id/add"
  android:icon="@mipmap/ic_launcher"
  android:title="添加到歌单"/>

 <item
  android:id="@+id/detail"
  android:icon="@mipmap/ic_launcher"
  android:title="歌曲详情"/>

 <item
  android:id="@+id/del"
  android:icon="@mipmap/ic_launcher"
  android:title="删除歌曲"/>

</menu>

private void showPopupMenu(View view) {
  // 这里的view代表popupMenu需要依附的view
  PopupMenu popupMenu = new PopupMenu(MainActivity.this, view);
  // 获取布局文件
  popupMenu.getMenuInflater().inflate(R.menu.sample_menu, popupMenu.getMenu());
  popupMenu.show();
  // 通过上面这几行代码，就可以把控件显示出来了
  popupMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
   @Override
   public boolean onMenuItemClick(MenuItem item) {
    // 控件每一个item的点击事件
    return true;
   }
  });
  popupMenu.setOnDismissListener(new PopupMenu.OnDismissListener() {
   @Override
   public void onDismiss(PopupMenu menu) {
    // 控件消失时的事件
   }
  });

 }

...
popupMenu.show();
switch (view.getId()) {
 case R.id.btn_world:
  popupMenu.getMenu().findItem(R.id.del).setVisible(false);
  break;
 default:
  break;
}
...

...
popupMenu.show();
switch (view.getId()) {
 case R.id.btn_world:
  popupMenu.getMenu().findItem(R.id.del).setVisible(false);
  break;
 default:
  break;
}
...

try {
   Field field = popupMenu.getClass().getDeclaredField("mPopup");
   field.setAccessible(true);
   MenuPopupHelper helper = (MenuPopupHelper) field.get(popupMenu);
   helper.setForceShowIcon(true);
  } catch (NoSuchFieldException e) {
   e.printStackTrace();
  } catch (IllegalAccessException e) {
   e.printStackTrace();
  }