Android利用DrawerLayout实现抽屉效果，,官网guide：http

Android利用DrawerLayout实现抽屉效果，,官网guide：http

官网guide：http://developer.android.com/training/implementing-navigation/nav-drawer.html

官网示例：NavigationDrawer.zip

android.support.v4.widget.DrawerLayout 抽屉layout。该widget只能实现从左向右、从右向左

openDrawer(), closeDrawer(), isDrawerOpen()

下面贴一下示例的主要的布局文件 和 activity实现 activity_main.xml```xml <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">

    <FrameLayout          android:id="@+id/content_frame"          android:layout_width="match_parent"          android:layout_height="match_parent" />    <ListView          android:id="@+id/left_drawer"          android:layout_width="240dp"          android:layout_height="match_parent"          android:layout_gravity="right"          android:choiceMode="singleChoice"          android:divider="@android:color/transparent"          android:dividerHeight="0dp"          android:background="#111"/>      <!--           android:choiceMode  选中状态 跟itemclick没有冲突                  none              值为0，表示无选择模式；                   singleChoice      值为1，表示最多可以有一项被选中；                  multipleChoice    值为2，表示可以多项被选中。        android:layout_gravity  left或right  left或start   right或end              表示在抽屉里的效果是从左到右还是从右到左出现       -->  </android.support.v4.widget.DrawerLayout>

```java    package com.stone.drawerlayout;      /*      * Copyright 2013 The Android Open Source Project      *      * Licensed under the Apache License, Version 2.0 (the "License");      * you may not use this file except in compliance with the License.      * You may obtain a copy of the License at      *      *     http://www.apache.org/licenses/LICENSE-2.0      *      * Unless required by applicable law or agreed to in writing, software      * distributed under the License is distributed on an "AS IS" BASIS,      * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.      * See the License for the specific language governing permissions and      * limitations under the License.      */      import java.util.Locale;      import android.app.Activity;      import android.app.Fragment;      import android.app.FragmentManager;      import android.app.SearchManager;      import android.content.Intent;      import android.content.res.Configuration;      import android.os.Bundle;      import android.support.v4.app.ActionBarDrawerToggle;      import android.support.v4.view.GravityCompat;      import android.support.v4.widget.DrawerLayout;      import android.view.LayoutInflater;      import android.view.Menu;      import android.view.MenuInflater;      import android.view.MenuItem;      import android.view.View;      import android.view.ViewGroup;      import android.widget.AdapterView;      import android.widget.ArrayAdapter;      import android.widget.ImageView;      import android.widget.ListView;      import android.widget.Toast;      /**      * This example illustrates a common usage of the DrawerLayout widget      * in the Android support library.      * <p/>      * <p>When a navigation (left) drawer is present, the host activity should detect presses of      * the action bar's Up affordance as a signal to open and close the navigation drawer. The      * ActionBarDrawerToggle facilitates this behavior.      * Items within the drawer should fall into one of two categories:</p>      * <p/>      * <ul>      * <li><strong>View switches</strong>. A view switch follows the same basic policies as      * list or tab navigation in that a view switch does not create navigation history.      * This pattern should only be used at the root activity of a task, leaving some form      * of Up navigation active for activities further down the navigation hierarchy.</li>      * <li><strong>Selective Up</strong>. The drawer allows the user to choose an alternate      * parent for Up navigation. This allows a user to jump across an app's navigation      * hierarchy at will. The application should treat this as it treats Up navigation from      * a different task, replacing the current task stack using TaskStackBuilder or similar.      * This is the only form of navigation drawer that should be used outside of the root      * activity of a task.</li>      * </ul>      * <p/>      * <p>Right side drawers should be used for actions, not navigation. This follows the pattern      * established by the Action Bar that navigation should be to the left and actions to the right.      * An action should be an operation performed on the current contents of the window,      * for example enabling or disabling a data overlay on top of the current content.</p>      */      public class MainActivity extends Activity {          private DrawerLayout mDrawerLayout;          private ListView mDrawerList;          private ActionBarDrawerToggle mDrawerToggle;          private CharSequence mDrawerTitle;          private CharSequence mTitle;          private String[] mPlanetTitles;          @Override          protected void onCreate(Bundle savedInstanceState) {              super.onCreate(savedInstanceState);              setContentView(R.layout.activity_main);              mTitle = mDrawerTitle = getTitle();              mPlanetTitles = getResources().getStringArray(R.array.planets_array);              mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);              mDrawerList = (ListView) findViewById(R.id.left_drawer);//抽屉里的view              // set a custom shadow that overlays the main content when the drawer opens              mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);//设置shadow              // set up the drawer's list view with items and click listener              mDrawerList.setAdapter(new ArrayAdapter<String>(this,                      R.layout.drawer_list_item, mPlanetTitles));              mDrawerList.setOnItemClickListener(new DrawerItemClickListener());              // enable ActionBar app icon to behave as action to toggle nav drawer   需要api level 11              getActionBar().setDisplayHomeAsUpEnabled(true);//给home icon的左边加上一个返回的图标              getActionBar().setHomeButtonEnabled(true); //需要api level 14  使用home-icon 可点击              // ActionBarDrawerToggle ties together the the proper interactions              // between the sliding drawer and the action bar app icon              mDrawerToggle = new ActionBarDrawerToggle(//v4控件  actionbar上的抽屉开关                      this,                  /* host Activity */                      mDrawerLayout,         /* DrawerLayout object */                      R.drawable.ic_drawer,  /* nav drawer image to replace 'Up' caret */     //上一级图标 返回图标                      R.string.drawer_open,  /* "open drawer" description for accessibility */                      R.string.drawer_close  /* "close drawer" description for accessibility */                      ) {                  public void onDrawerClosed(View view) {//抽屉关闭后                      getActionBar().setTitle(mDrawerTitle);                      invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()                  }                  public void onDrawerOpened(View drawerView) {//抽屉打开后                      getActionBar().setTitle(mTitle);                      invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()                  }                  @Override                  public boolean onOptionsItemSelected(MenuItem item) {                      if (item != null &amp;&amp; item.getItemId() == android.R.id.home) {//actionbar上的home icon                          //END即gravity.right 从右向左显示   START即left  从左向右弹出显示                          if (mDrawerLayout.isDrawerVisible(GravityCompat.END)) {                              mDrawerLayout.closeDrawer(GravityCompat.END);//关闭抽屉                          } else {                              mDrawerLayout.openDrawer(GravityCompat.END);//打开抽屉                          }                          return true;                      }                      return false;                  }              };              mDrawerLayout.setDrawerListener(mDrawerToggle);//设置抽屉监听              if (savedInstanceState == null) {      //            selectItem(0);              }          }          @Override          public boolean onCreateOptionsMenu(Menu menu) {//加载menu  sdk3.0以后menu包含在actionbar中              MenuInflater inflater = getMenuInflater();              inflater.inflate(R.menu.main, menu);              return super.onCreateOptionsMenu(menu);          }          /* Called whenever we call invalidateOptionsMenu() */          @Override          public boolean onPrepareOptionsMenu(Menu menu) {              // If the nav drawer is open, hide action items related to the content view              boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);              menu.findItem(R.id.action_websearch).setVisible(!drawerOpen);//search的显示与drawer的显示相反              return super.onPrepareOptionsMenu(menu);          }          @Override          public boolean onOptionsItemSelected(MenuItem item) {               // The action bar home/up action should open or close the drawer.               // ActionBarDrawerToggle will take care of this.              if (mDrawerToggle.onOptionsItemSelected(item)) {                  return true;              }              // Handle action buttons              switch(item.getItemId()) {              case R.id.action_websearch:                  // create intent to perform web search for this planet                  Intent intent = new Intent(Intent.ACTION_WEB_SEARCH);                  intent.putExtra(SearchManager.QUERY, getActionBar().getTitle());                  // catch event that there's no activity to handle intent                  if (intent.resolveActivity(getPackageManager()) != null) {                      startActivity(intent);                  } else {                      Toast.makeText(this, R.string.app_not_available, Toast.LENGTH_LONG).show();                  }                  return true;              default:                  return super.onOptionsItemSelected(item);              }          }          /* The click listner for ListView in the navigation drawer */          private class DrawerItemClickListener implements ListView.OnItemClickListener {              @Override              public void onItemClick(AdapterView<?> parent, View view, int position, long id) {                  selectItem(position);              }          }        //内容区显示PlanetFragment          private void selectItem(int position) {              // update the main content by replacing fragments              Fragment fragment = new PlanetFragment();              Bundle args = new Bundle();              args.putInt(PlanetFragment.ARG_PLANET_NUMBER, position);              fragment.setArguments(args);              FragmentManager fragmentManager = getFragmentManager();              fragmentManager.beginTransaction().replace(R.id.content_frame, fragment).commit();              // update selected item and title, then close the drawer      //        mDrawerList.setItemChecked(position, true);      //        setTitle(mPlanetTitles[position]);              mDrawerLayout.closeDrawer(mDrawerList);          }          @Override          public void setTitle(CharSequence title) {              mDrawerTitle = title;              getActionBar().setTitle(mDrawerTitle);          }          /**          * When using the ActionBarDrawerToggle, you must call it during          * onPostCreate() and onConfigurationChanged()...          */          @Override          protected void onPostCreate(Bundle savedInstanceState) {              super.onPostCreate(savedInstanceState);              // Sync the toggle state after onRestoreInstanceState has occurred.              mDrawerToggle.syncState();          }          @Override          public void onConfigurationChanged(Configuration newConfig) {              super.onConfigurationChanged(newConfig);              // Pass any configuration change to the drawer toggls              mDrawerToggle.onConfigurationChanged(newConfig);          }          /**          * Fragment that appears in the "content_frame", shows a planet          */          public static class PlanetFragment extends Fragment {              public static final String ARG_PLANET_NUMBER = "planet_number";              public PlanetFragment() {                  // Empty constructor required for fragment subclasses              }              @Override              public View onCreateView(LayoutInflater inflater, ViewGroup container,                      Bundle savedInstanceState) {                  View rootView = inflater.inflate(R.layout.fragment_planet, container, false);                  int i = getArguments().getInt(ARG_PLANET_NUMBER);                  String planet = getResources().getStringArray(R.array.planets_array)[i];                  //查找出 res-drawable资源的id                  int imageId = getResources().getIdentifier(planet.toLowerCase(Locale.getDefault()),                                  "drawable", getActivity().getPackageName());                  ((ImageView) rootView.findViewById(R.id.image)).setImageResource(imageId);                  getActivity().setTitle(planet);                  return rootView;              }          }      }