android状态栏下载

public class UpdateService extends Service{
private NotificationManager nm;
private Notification notification;
private File tempFile=null;
private boolean cancelUpdate=false;
private MyHandler myHandler;
private int download_precent=0;
private RemoteViews views;
private int notificationId=1234;

@Override
public IBinder onBind(Intent intent) {
return null;
}

@Override
public void onStart(Intent intent,int startId){
super.onStart(intent, startId);
}

@Override
public int onStartCommand(Intent intent,int flags,int startId){
nm=(NotificationManager)getSystemService(NOTIFICATION_SERVICE);
notification=new Notification();
notification.icon=android.R.drawable.stat_sys_download;
//notification.icon=android.R.drawable.stat_sys_download_done;
notification.tickerText=getString(R.string.app_name)+"更新";
notification.when=System.currentTimeMillis();
notification.defaults=Notification.DEFAULT_LIGHTS;

//设置任务栏中下载进程显示的views
views=new RemoteViews(getPackageName(),R.layout.update);
notification.contentView=views;

PendingIntent contentIntent=PendingIntent.getActivity(this,0,new Intent(this,City.class),0);
notification.setLatestEventInfo(this,"","", contentIntent);

//将下载任务添加到任务栏中
nm.notify(notificationId,notification);

myHandler=new MyHandler(Looper.myLooper(),this);

//初始化下载任务内容views
Message message=myHandler.obtainMessage(3,0);
myHandler.sendMessage(message);

//启动线程开始执行下载任务
downFile(intent.getStringExtra("url"));
return super.onStartCommand(intent, flags, startId);
}

@Override
public void onDestroy(){
super.onDestroy();
}

//下载更新文件
private void downFile(final String url) {
new Thread() {
public void run(){
try {
HttpClient client = new DefaultHttpClient();
// params[0]代表连接的url
HttpGet get = new HttpGet(url);
HttpResponse response = client.execute(get);
HttpEntity entity = response.getEntity();
long length = entity.getContentLength();
InputStream is = entity.getContent();
if (is != null) {
File rootFile=new File(Environment.getExternalStorageDirectory(), "/pinke");
if(!rootFile.exists()&&!rootFile.isDirectory())
rootFile.mkdir();

tempFile = new File(Environment.getExternalStorageDirectory(),

"/pinke/"+url.substring(url.lastIndexOf("/")+1));
if(tempFile.exists())
tempFile.delete();
tempFile.createNewFile();

//已读出流作为参数创建一个带有缓冲的输出流
BufferedInputStream bis = new BufferedInputStream(is);

//创建一个新的写入流，讲读取到的图像数据写入到文件中
FileOutputStream fos = new FileOutputStream(tempFile);
//已写入流作为参数创建一个带有缓冲的写入流
BufferedOutputStream bos = new BufferedOutputStream(fos);

int read;
long count=0;
int precent=0;
byte[] buffer=new byte[1024];
while( (read = bis.read(buffer)) != -1 && !cancelUpdate){
bos.write(buffer,0,read);
count+=read;
precent=(int)(((double)count/length)*100);

//每下载完成5%就通知任务栏进行修改下载进度
if(precent-download_precent>=5){
download_precent=precent;
Message message=myHandler.obtainMessage(3,precent);
myHandler.sendMessage(message);
}
}
bos.flush();
bos.close();
fos.flush();
fos.close();
is.close();
bis.close();
}

if(!cancelUpdate){
Message message=myHandler.obtainMessage(2,tempFile);
myHandler.sendMessage(message);
}else{
tempFile.delete();
}
} catch (ClientProtocolException e) {
Message message=myHandler.obtainMessage(4,"下载更新文件失败");
myHandler.sendMessage(message);
} catch (IOException e) {
Message message=myHandler.obtainMessage(4,"下载更新文件失败");
myHandler.sendMessage(message);
} catch(Exception e){
Message message=myHandler.obtainMessage(4,"下载更新文件失败");
myHandler.sendMessage(message);
}
}
}.start();
}

//安装下载后的apk文件
private void Instanll(File file,Context context){
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setAction(android.content.Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(file),"application/vnd.android.package-archive");
context.startActivity(intent);
}

/*事件处理类*/
class MyHandler extends Handler{
private Context context;
public MyHandler(Looper looper,Context c){
super(looper);
this.context=c;
}

@Override
public void handleMessage(Message msg){
super.handleMessage(msg);
if(msg!=null){
switch(msg.what){
case 0:
Toast.makeText(context,msg.obj.toString(), Toast.LENGTH_SHORT).show();
break;
case 1:
break;
case 2:

//下载完成后清除所有下载信息，执行安装提示
download_precent=0;
nm.cancel(notificationId);
Instanll((File)msg.obj,context);

//停止掉当前的服务
stopSelf();
break;
case 3:

//更新状态栏上的下载进度信息
views.setTextViewText(R.update_id.tvProcess,"已下载"+download_precent+"%");
views.setProgressBar(R.update_id.pbDownload,100,download_precent,false);
notification.contentView=views;
nm.notify(notificationId,notification);
break;
case 4:
nm.cancel(notificationId);
break;
}
}
}
}

}

下载更新提示的布局xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:background="#f2f2f2" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:gravity="center">
<ImageView
android:id="@+update_id/ivLogo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/logo"
android:layout_margin="10dip" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_weight="1"
android:layout_marginRight="10dip">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@color/deepblack"
android:text="@string/app_name"
android:textSize="18dip"
android:textStyle="bold"/>
<ProgressBar
android:id="@+update_id/pbDownload"
android:layout_width="fill_parent"
android:layout_height="12dip"
android:progress="0"
android:max="100"
android:progressDrawable="@drawable/pb_style"
style="?android:attr/progressBarStyleHorizontal"
mce_style="?android:attr/progressBarStyleHorizontal" />
<TextView
android:id="@+update_id/tvProcess"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@color/deepblack"
android:text="已下载0%"
android:textSize="12dip"
android:textStyle="bold" />
</LinearLayout>
</LinearLayout>

</LinearLayout>

在外面需要调用下载任务的地方使用startService(intent)来调用这个Service就可以了，最终的效果图片

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