android.support.v4.widget.DrawerLayout 抽屉效果导航菜单-原创手记-慕课网

抽屉效果导航菜单图示

如图所示，抽屉效果的导航菜单不用切换到另一个页面，也不用去按菜单的硬件按钮，直接在界面左上角的一个按钮点击，菜单就滑出来，而且感觉能放很多东西

概况：实现上图所示的抽屉效果的导航菜单有以下两种方式
　　方式1.用SlidingDrawer：

　　http://developer.android.com/reference/android/widget/SlidingDrawer.html

　　但是不知道为什么这个类官方不建议再继续用了：

　　Deprecated since API level 17

　　方式2.用DrawerLayout：

　　http://developer.android.com/reference/android/support/v4/widget/DrawerLayout.html

　　Guide在这里：

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

代码：android.support.v4.widget.DrawerLayout 实现抽屉效果的导航菜单

<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" >

    <!-- 主要内容的视图-->
    <!-- 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" />

    <!-- 导航菜单 -->

    <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。

代码：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);
}

}

　　比较纠结的是用了Level 11的一个API，(Android API 11对应的是android 3.0)这样minSdkVersion就有限制，android版本不能太低。

　　图片资源Android官网示例处提供下载了。

　　程序运行后效果如下：

　　抽屉打开前：

　　抽屉打开后：

库的引用
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(如果您采用的开发工具是android studio而非eclipse，则应该安装Android Support Repository)，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.

参考
关于Android Support Library 详情可阅读：http://blog.csdn.net/crazybigfish/article/details/18554201