Android DrawerLayout实现侧拉菜单功能

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"   xmlns:tools="http://schemas.android.com/tools"   xmlns:app="http://schemas.android.com/apk/res-auto"   android:layout_width="match_parent"   android:layout_height="match_parent"   tools:context="com.example.lenovo.mydrawerlayout.MainActivity"> <android.support.v4.widget.DrawerLayout   android:layout_width="match_parent"   android:id="@+id/drawer_layout"   android:layout_height="match_parent">   <LinearLayout     android:layout_width="match_parent"     android:layout_height="match_parent"     android:orientation="vertical"     >     <android.support.v7.widget.Toolbar       android:id="@+id/toolbar"       android:layout_width="match_parent"       android:layout_height="?attr/actionBarSize"       android:background="?attr/colorPrimary"       app:popupTheme="@style/AppTheme.PopupOverlay" />     <TextView       android:layout_width="wrap_content"       android:layout_height="wrap_content"       android:text="这是主界面"       />   </LinearLayout>   <LinearLayout     android:layout_width="300dp"     android:layout_height="match_parent"     android:layout_gravity="left"     android:background="#f00"     >     <TextView       android:id="@+id/t"       android:layout_width="wrap_content"       android:layout_height="wrap_content"       android:text="这是侧拉界面"       />   </LinearLayout> </android.support.v4.widget.DrawerLayout> </LinearLayout> 

<resources>    <!-- Base application theme. -->   <style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">     <!-- Customize your theme here. -->     <item name="colorPrimary">@color/colorPrimary</item>     <item name="colorPrimaryDark">@color/colorPrimaryDark</item>     <item name="colorAccent">@color/colorAccent</item>   </style>   <style name="AppTheme.NoActionBar">     <item name="windowActionBar">false</item>     <item name="windowNoTitle">true</item>   </style>   <style name="AppTheme.AppBarOverlay" parent="ThemeOverlay.AppCompat.Dark.ActionBar" />   <style name="AppTheme.PopupOverlay" parent="ThemeOverlay.AppCompat.Light" /> </resources> 

package com.example.lenovo.mydrawerlayout;  import android.os.Bundle; import android.support.design.widget.Snackbar; import android.support.v4.view.GravityCompat; import android.support.v4.widget.DrawerLayout; import android.support.v7.app.ActionBarDrawerToggle; import android.support.v7.app.AppCompatActivity; import android.support.v7.widget.Toolbar; import android.view.View; import android.widget.TextView; public class MainActivity extends AppCompatActivity {   @Override   protected void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.activity_main);     //Toolbar代替ActionBar     Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);     setSupportActionBar(toolbar);     // DrawerLayout     DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);     //Toolbar上面最左边显示三杠图标监听DrawerLayout     ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(         this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);     drawer.setDrawerListener(toggle);     toggle.syncState();     //侧拉页面字体     TextView t= (TextView) findViewById(R.id.t);     t.setOnClickListener(new View.OnClickListener() {       @Override       public void onClick(View v) {         Snackbar.make(v, "侧拉页面", Snackbar.LENGTH_LONG)             .setAction("Action", null).show();       }     });   }   @Override   public void onBackPressed() {     DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);     if (drawer.isDrawerOpen(GravityCompat.START)) {       drawer.closeDrawer(GravityCompat.START);     } else {       super.onBackPressed();     }   } }