Drawerlayout侧滑

*************效果图************

image.png
首先，布局文件：
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/drawer"
android:layout_width="match_parent"
android:layout_height="match_parent">

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <Button
        android:id="@+id/btnOpenMenu"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="打开侧滑菜单" />

</LinearLayout>

<TextView
    android:layout_width="200dp"
    android:layout_height="match_parent"
    android:layout_gravity="start"
    android:background="#9acf9a"
    android:gravity="center"
    android:text="这里是菜单布局" />

</android.support.v4.widget.DrawerLayout>

MainActivity中

···
private Button btnOpenMenu;
private DrawerLayout drawer;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    btnOpenMenu = (Button) findViewById(R.id.btnOpenMenu);
    drawer = (DrawerLayout) findViewById(R.id.drawer);

    btnOpenMenu.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            drawer.openDrawer(Gravity.LEFT);
        }
    });

}

···