Android App中DrawerLayout抽屉效果的菜单编写实例

抽屉效果的导航菜单
看了很多应用，觉得这种侧滑的抽屉效果的菜单很好。

不用切换到另一个页面，也不用去按菜单的硬件按钮，直接在界面上一个按钮点击，菜单就滑出来，而且感觉能放很多东西。
库的引用：
首先， DrawerLayout这个类是在Support Library里的，需要加上android-support-v4.jar这个包。

然后程序中用时在前面导入import android.support.v4.widget.DrawerLayout;

如果找不到这个类，首先用SDK Manager更新一下Android Support Library，然后在Android SDK/extras/android/support/v4路径下找到android-support-v4.jar，复制到项目的libs路径，将其Add to Build Path.

代码1
布局：

<RelativeLayout 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.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" >    <!-- The main content view -->    <!-- main content must be the first element of DrawerLayout because it will be drawn first and drawer must be on top of it -->    <FrameLayout      android:id="@+id/content_frame"      android:layout_width="match_parent"      android:layout_height="match_parent" />    <!-- The navigation drawer -->    <ListView      android:id="@+id/left_drawer"      android:layout_width="240dp"      android:layout_height="match_parent"      android:layout_gravity="left"      android:background="#111"      android:choiceMode="singleChoice"      android:divider="@android:color/transparent"      android:dividerHeight="0dp" />  </android.support.v4.widget.DrawerLayout></RelativeLayout>　

　　DrawerLayout的第一个子元素是主要内容，即抽屉没有打开时显示的布局。这里采用了一个FrameLayout，里面什么也没放。

　　DrawerLayout的第二个子元素是抽屉中的内容，即抽屉布局，这里采用了一个ListView。

主要的Activity（从官方实例中扒出来的）：

package com.example.hellodrawer;import android.os.Bundle;import android.app.Activity;import android.content.res.Configuration;import android.view.MenuItem;import android.view.View;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.ArrayAdapter;import android.widget.ListView;import android.support.v4.app.ActionBarDrawerToggle;import android.support.v4.view.GravityCompat;import android.support.v4.widget.DrawerLayout;public class HelloDrawerActivity extends Activity{  private String[] mPlanetTitles;  private DrawerLayout mDrawerLayout;  private ActionBarDrawerToggle mDrawerToggle;  private ListView mDrawerList;  @Override  public void onCreate(Bundle savedInstanceState)  {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_hello_drawer);    mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);    // init the ListView and Adapter, nothing new    initListView();    // set a custom shadow that overlays the main content when the drawer    // opens    mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow,        GravityCompat.START);    mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,        R.drawable.ic_drawer, R.string.drawer_open,        R.string.drawer_close)    {      /** Called when a drawer has settled in a completely closed state. */      public void onDrawerClosed(View view)      {        invalidateOptionsMenu(); // creates call to                      // onPrepareOptionsMenu()      }      /** Called when a drawer has settled in a completely open state. */      public void onDrawerOpened(View drawerView)      {        invalidateOptionsMenu(); // creates call to                      // onPrepareOptionsMenu()      }    };    // Set the drawer toggle as the DrawerListener    mDrawerLayout.setDrawerListener(mDrawerToggle);    // enable ActionBar app icon to behave as action to toggle nav drawer    getActionBar().setDisplayHomeAsUpEnabled(true);    // getActionBar().setHomeButtonEnabled(true);    // Note: getActionBar() Added in API level 11  }  private void initListView()  {    mDrawerList = (ListView) findViewById(R.id.left_drawer);    mPlanetTitles = getResources().getStringArray(R.array.planets_array);    // Set the adapter for the list view    mDrawerList.setAdapter(new ArrayAdapter<String>(this,        R.layout.list_item, mPlanetTitles));    // Set the list's click listener    mDrawerList.setOnItemClickListener(new OnItemClickListener()    {      @Override      public void onItemClick(AdapterView<?> parent, View view,          int position, long id)      {        // Highlight the selected item, update the title, and close the        // drawer        mDrawerList.setItemChecked(position, true);        setTitle(mPlanetTitles[position]);        mDrawerLayout.closeDrawer(mDrawerList);      }    });  }  @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);    mDrawerToggle.onConfigurationChanged(newConfig);  }  @Override  public boolean onOptionsItemSelected(MenuItem item)  {    // Pass the event to ActionBarDrawerToggle, if it returns    // true, then it has handled the app icon touch event    if (mDrawerToggle.onOptionsItemSelected(item))    {      return true;    }    // Handle your other action bar items...    return super.onOptionsItemSelected(item);  }}