Android实现选项菜单子菜单

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
 <item
 android:id="@+id/menuFont"
 android:title="字体大小">
 <menu>
  <group
  android:id="@+id/groupFont"
  android:checkableBehavior="none">
  <item
   android:id="@+id/font_10"
   android:title="10" />
  <item
   android:id="@+id/font_12"
   android:title="12" />
  <item
   android:id="@+id/font_14"
   android:title="14" />
  <item
   android:id="@+id/font_16"
   android:title="16" />
  <item
   android:id="@+id/font_18"
   android:title="18" />
  </group>
 </menu>
 </item>

 <item
 android:id="@+id/menuColor"
 android:icon="@mipmap/ic_launcher"
 android:title="字体颜色">
 <menu>
  <group
  android:id="@+id/groupColor"
  android:checkableBehavior="none">
  <item
   android:id="@+id/red"
   android:title="红色" />
  <item
   android:id="@+id/blue"
   android:title="蓝色" />
  <item
   android:id="@+id/green"
   android:title="绿色" />
  </group>
 </menu>
 </item>
</menu>

public class MainActivity extends AppCompatActivity {

private EditText mEdt;
private TextView mTv;


@Override
protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 mEdt = (EditText) findViewById(R.id.mEdt);
 mTv = (TextView) findViewById(R.id.mInput);
}

/**
 * 通过该方法添加菜单项或子菜单项
 * @param menu
 * @return
 */
@Override
public boolean onCreateOptionsMenu(Menu menu) {
 //方式一添加菜单布局
 MenuInflater inflater = new MenuInflater(this);
 //将解析到的布局添加到menu中
 inflater.inflate(R.menu.menu_main, menu);
 //方式二添加菜单布局
// getMenuInflater().inflate(R.menu.menu_main,menu);
 return super.onCreateOptionsMenu(menu);
}

/**
 * 设置菜单项的点击事件
 * @param item
 * @return
 */
@Override
public boolean onOptionsItemSelected(MenuItem item) {

 switch (item.getItemId()) {
 case R.id.menuColor:
  Toast.makeText(this, "你选择了修改颜色", Toast.LENGTH_SHORT).show();
  break;
 case R.id.menuFont:
  Toast.makeText(this, "你选择了修改字体", Toast.LENGTH_SHORT).show();
  break;
 }
 return super.onOptionsItemSelected(item);
 }
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
 //先判断点击的是哪个id
 switch (item.getItemId()) {
 case R.id.font_10:
  mEdt.setTextSize(10 * 2);
  break;
 case R.id.font_12:
  mEdt.setTextSize(12 * 2);
  break;
 case R.id.font_14:
  mEdt.setTextSize(14 * 2);
  break;
 case R.id.font_16:
  mEdt.setTextSize(16 * 2);
  break;
 case R.id.font_18:
  mEdt.setTextSize(18 * 2);
  break;
 case R.id.blue:
  mEdt.setTextColor(Color.BLUE);
  break;
 case R.id.red:
  mEdt.setTextColor(Color.RED);
  break;
 case R.id.green:
  mEdt.setTextColor(Color.GREEN);
  break;
 }
 return super.onOptionsItemSelected(item);
}