课题：Android 抽屉效果的导航菜单实现

1、Android 抽屉效果的导航菜单实现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。 关于实现，搜索了一下，有如下两种：1.用SlidingDrawer：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 172.用DrawerLayout：Guide在这里： 库的引用 首先， DrawerLayout这个类是在Support Library里的，需要加上android-suppo

2、rt-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 SDKextrasandroidsupportv4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=" xmlns:tools=" android:la

3、yout_width="match_parent" android:layout_height="match_parent" > <android.support.v4.widget.DrawerLayout xmlns:android=" android:id="+id/drawer_layout" android:layout_width="match_parent" android:layout_height="match_parent" > <!- Th

4、e 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

5、" /> <!- 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&

6、quot; 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。 

7、; 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.OnItemClickList

8、ener;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; privat

9、e 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.drawe

10、r_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

11、.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. */ p

12、ublic 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().setDispla

13、yHomeAsUpEnabled(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

14、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) / High

15、light the selected item, update the title, and close the / drawer mDrawerList.setItemChecked(position, true); setTitle(mPlanetTitlesposition); mDrawerLayout.closeDrawer(mDrawerList); ); Override protected void onPostCreate(Bundle savedInstanceState) super.onPostCreate(savedInstanceState); / Sync the

16、 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 it

17、em) / 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，这样minSdkVersion就有限

18、制，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：  代码2今天又看了一下DrawerLayout的类，发现有很多方法可以直接用的。重新试了一下，其实不用上面那么麻烦，随便自己定义一个按钮控制抽屉的打开就行：布局：<RelativeLayout xmlns:android=" xmlns:tools=" android:layout_width="match_parent" android:layout_height="match_parent" andro

19、id:paddingBottom="dimen/activity_vertical_margin" android:paddingLeft="dimen/activity_horizontal_margin" android:paddingRight="dimen/activity_horizontal_margin" android:paddingTop="dimen/activity_vertical_margin" tools:context=".DrawerActivity" >

20、<android.support.v4.widget.DrawerLayout android:id="+id/drawer_layout" android:layout_width="match_parent" android:layout_height="match_parent" > <!- The main content view -> <FrameLayout android:id="+id/content_frame" android:layout_width="

21、;match_parent" android:layout_height="match_parent" > <Button android:id="+id/btn" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="open" /> </FrameLayout> <!- The navigation drawer -> &

22、lt;ListView android:id="+id/left_drawer" android:layout_width="240dp" android:layout_height="match_parent" android:layout_gravity="start" android:background="#111" android:choiceMode="singleChoice" android:divider="android:color/transparent" android:dividerHeight="0dp" /> </android.support.v4.widget.DrawerLayout></RelativeLayout> 主要代码：package