android PopupMenu彈出式菜單的使用



PopupMenu代表彈出式菜單。他會指定組件上彈出PopupMenu，默認情況下PopupMenu會顯示在該組件的下方或者上方，PopupMenu可以增加多個菜單項並且可以爲菜單項添加子菜單、

首先在res/menu下編寫xml文件my_menu.xml

<menu xmlns:android="http://schemas.android.com/apk/res/android" >

    <item
        android:icon="@drawable/ic_launcher"
        android:title="字體">
        <menu>

            <!-- 定義一個單項菜單項 -->
            <group android:checkableBehavior="single" >
                <item
                    android:id="@+id/font_10"
                    android:title="10號字體"/>
                <item
                    android:id="@+id/font_12"
                    android:title="12號字體"/>
                <item
                    android:id="@+id/font_14"
                    android:title="14號字體"/>
                <item
                    android:id="@+id/font_16"
                    android:title="16號字體"/>
                <item
                    android:id="@+id/font_18"
                    android:title="18號字體"/>
            </group>
        </menu>
    </item>
    <!-- 定義一個普通菜單項 -->
    <item
        android:icon="@drawable/fy_d_kf"
        android:title="普通菜單"/>
    <item
        android:icon="@drawable/fy_d_kf2"
        android:title="顏色">
        <menu>

            <!-- 定義一個單項菜單項 -->
            <group>
                <item
                    android:id="@+id/red"
                    android:title="紅色"/>
                <item
                    android:id="@+id/blue"
                    android:title="藍色"/>
                <item
                    android:id="@+id/green"
                    android:title="綠色"/>
            </group>
        </menu>
    </item>

</menu>

在activity中主要的代碼如下

public class MainActivity extends Activity {

 private TextView edit;
 private PopupMenu menu;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  edit = (TextView) findViewById(R.id.textView1);
  edit.setOnClickListener(new OnClickListener() {

   @Override
   public void onClick(View arg0) {
    clickpopuMne(arg0);
   }
  });
 }

 public void clickpopuMne(View v) {
  menu = new PopupMenu(this, v);
  getMenuInflater().inflate(R.menu.my_menu, menu.getMenu());
  menu.setOnMenuItemClickListener(new OnMenuItemClickListener() {
   
   @Override
   public boolean onMenuItemClick(MenuItem arg0) {
    switch (arg0.getItemId()) {
    case R.id.font_10:
     menu.dismiss();
     break;
    default:
     Toast.makeText(MainActivity.this, ""+arg0.getTitle(), Toast.LENGTH_SHORT).show();
    }
    return true;
   }
  });
  menu.show();
 }
}