<?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_layout"   android:layout_width="match_parent"   android:layout_height="match_parent">   <!-- content -->   <FrameLayout     android:id="@+id/drawer_container"     android:layout_width="match_parent"     android:layout_height="match_parent"/>   <!-- Drawer-->   <ListView     android:id="@+id/drawer_menu"     android:layout_width="240dp"     android:layout_height="match_parent"     android:background="#FFF0F0F0"     android:layout_gravity="start"/>   <!--       android:choiceMode    選中狀態 跟onItemClick沒有沖突          none       值為0，表示無選擇模式；           singleChoice   值為1，表示最多可以有一項被選中；          multipleChoice  值為2，表示可以多項被選中。      android:layout_gravity left或right left或start  right或end        表示在抽屜里的效果是從左到右還是從右到左出現    --> </android.support.v4.widget.DrawerLayout> 

package com.jackie.drawerlayoutdemo; import android.os.Bundle; import android.support.v4.widget.DrawerLayout; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.ListView; import android.widget.TextView; public class MainActivity extends AppCompatActivity {   private String mTitle;   private DrawerLayout mDrawerLayout;   private ListView mDrawerMenu;   @Override   protected void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.activity_main);     initView();     initData();     //默認打開抽屜     mDrawerLayout.openDrawer(mDrawerMenu);   }   private void initView() {     mTitle = getResources().getString(R.string.app_name);     mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);     mDrawerMenu = (ListView) findViewById(R.id.drawer_menu);   }   private void initData() {     //數組定義在xml 文件中     String[] items = getResources().getStringArray(R.array.left_drawer_items);     ArrayAdapter<String> adapter = new ArrayAdapter<>(this, android.R.layout.simple_expandable_list_item_1);     adapter.addAll(items);     mDrawerMenu.setAdapter(adapter);     mDrawerMenu.setSelection(0);     //設置點擊item事件     mDrawerMenu.setOnItemClickListener(new AdapterView.OnItemClickListener() {       @Override       public void onItemClick(AdapterView<?> parent, View view, int position, long id) {         mTitle = ((TextView) view).getText().toString();         switchFragment();         mDrawerLayout.closeDrawer(mDrawerMenu);         mDrawerMenu.setSelection(position);       }     });   }   private void switchFragment() {     getSupportFragmentManager().beginTransaction().replace(R.id.drawer_container, new ItemFragment(mTitle)).commit();     getSupportActionBar().setTitle(mTitle);   } }