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);  }}