Android5.0 旋转菜单实例详解

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:background="#fff0ff"
  android:orientation="vertical"
  tools:context="a.fmy.com.myapplication.MainActivity">
<!--标题栏-->
  <android.support.v7.widget.Toolbar
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="?attr/colorPrimary"
    android:minHeight="?attr/actionBarSize" />
  <android.support.v4.widget.DrawerLayout
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#0ff"
   >
    <!--内容-->
    <LinearLayout
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:background="#ff0"></LinearLayout>
    <!--菜单-->
    <LinearLayout
      android:layout_width="200dp"
      android:layout_height="match_parent"
      android:layout_gravity="start"
      android:background="#f0f" />
  </android.support.v4.widget.DrawerLayout>
</LinearLayout>

public class MainActivity extends AppCompatActivity {
  private Toolbar toobar;
  private ActionBarDrawerToggle actionBarDrawerToggle;
  private DrawerLayout drawerLayout;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    toobar = (Toolbar) findViewById(R.id.toolbar);
    //设置toobar为标题栏
    setSupportActionBar(toobar);
    //设置显示旋转菜单
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    //抽屉布局
    drawerLayout = ((DrawerLayout) findViewById(R.id.activity_main));
    //activitybar开关
    actionBarDrawerToggle = new ActionBarDrawerToggle(this, drawerLayout, R.string.app_name, R.string.app_name);
    //同步开关 如果不写的话, 滑动开关 按钮一直就一个状态 不会变化
    actionBarDrawerToggle.syncState();
    //添加监听
    drawerLayout.addDrawerListener(actionBarDrawerToggle);
  }
  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    //这里是让用户点击按钮的时候可以打开抽屉
    return actionBarDrawerToggle.onOptionsItemSelected(item)
        || super.onOptionsItemSelected(item);
  }
}