Android 抽屉效果的导航菜单实现

　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);
}

}