android.support.v4.widget.DrawerLayout 抽屉效果导航菜单
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
<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" > <!-- 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
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