通知栏显示下载进度

一般app在进入主界面时会与后台服务器进行一次版本比较,后台服务器存放最新版本的app,如果用户当前的版本号与之不对应,则要提示用户进行更新。

在弹出的dialog的确定键代码里写入:

Intent it = new Intent(MainActivity.this, UpdateService.class); 

startService(it);

bindService(it, conn, Context.BIND_AUTO_CREATE);

ServiceConnection conn = new ServiceConnection() {

@Override

public void onServiceDisconnected(ComponentName name) {

// TODO Auto-generated method stub

}

@Override

public void onServiceConnected(ComponentName name, IBinder service) {

// TODO Auto-generated method stub

}

};

//在此处要对service进行停止操作

@Override

protected void onDestroy()

{

Intent it = new Intent(this, UpdateService.class);

stopService(it);

super.onDestroy();

}

下面是UpdateService,继承Service类,复写相关方法,注意要在application里配置该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 = 0;

重写onStartCommand方法。

@Override

public int onStartCommand(Intent intent, int flags, int startId) {

setUpNotification();//创建通知

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("服务器存放最新apk的URL");

return super.onStartCommand(intent, flags, startId);

}

创建通知,布局可以自己定义,一般包含有图标,app名称和一个progressbar。这段代码的布局后面再贴出。

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;

// 放置在"正在运行"栏目中

notification.flags = Notification.FLAG_ONGOING_EVENT;

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_service);

notification.contentView = views;

PendingIntent contentIntent = PendingIntent.getActivity(this, 0,

new Intent(this, MainActivity.class), PendingIntent.FLAG_UPDATE_CURRENT);

notification.contentIntent = contentIntent;

// 将下载任务添加到任务栏中

nm.notify(notificationId, notification);

下载更新文件

注意,更新进度条的频率不能太高,不然容易造成卡顿。

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(),

"/QiLoo");

if (!rootFile.exists() && !rootFile.isDirectory())

rootFile.mkdir();

tempFile = new File(

Environment.getExternalStorageDirectory(),

"/QiLoo/"+ 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,这是固定写法

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);

}

消息处理

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.id.tvProcess, "已下载"

+ download_precent + "%");

views.setProgressBar(R.id.pbDownload, 100,

download_precent, false);

notification.contentView = views;

nm.notify(notificationId, notification);

break;

case 4:

nm.cancel(notificationId);

break;

}

}

}

}

最后贴出update的布局文件

通知栏显示下载进度_第1张图片

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