android用xml文件設置菜單

首先在res/mene文件夾下編寫xml文件my_menu

<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中的主要代碼如下

public class MainActivity extends Activity {

 private TextView edit;
 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
  MenuInflater inflater = new MenuInflater(this);
  inflater.inflate(R.menu.my_menu , menu);
  return super.onCreateOptionsMenu(menu);
 }

 @Override
 public boolean onOptionsItemSelected(MenuItem item) {
  if(item.isCheckable()){
   item.setChecked(true);
  }
  switch (item.getItemId()) {
  case R.id.font_10:
   edit.setTextSize(10*2);
   break;
  case R.id.font_12:
   edit.setTextSize(12*2);
   break;
  case R.id.font_14:
   edit.setTextSize(14*2);
   break;
  case R.id.font_16:
   edit.setTextSize(16*2);
   break;
  case R.id.font_18:
   edit.setTextSize(18*2);
   break;
  }
  return true;
 }

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