Android 下载文件通知栏显示进度条功能的实例代码

1、使用AsyncTask异步任务实现,调用publishProgress()方法刷新进度来实现(已优化)

public class MyAsyncTask extends AsyncTask<String,Integer,Integer> {

private Context context;

private NotificationManager notificationManager;

private NotificationCompat.Builder builder;

public MyAsyncTask(Context context){

this.context = context;

notificationManager = (NotificationManager) context.getSystemService(Activity.NOTIFICATION_SERVICE);

builder = new NotificationCompat.Builder(context);

}

@Override

protected void onPreExecute() {

super.onPreExecute();

builder.setSmallIcon(R.mipmap.ic_launcher)

.setContentInfo("下载中...")

.setContentTitle("正在下载");

}

@Override

protected Integer doInBackground(String... params) {

Log.e(TAG, "doInBackground: "+params[0] );

InputStream is = null;

OutputStream os = null;

HttpURLConnection connection = null;

int total_length = 0;

try {

URL url1 = new URL(params[0]);

connection = (HttpURLConnection) url1.openConnection();

connection.setRequestMethod("GET");

connection.setReadTimeout(50000);

connection.connect();

if(connection.getResponseCode() == 200){

is = connection.getInputStream();

os = new FileOutputStream("/sdcard/zongzhi.apk");

byte [] buf = new byte[1024];

int len;

int pro1=0;

int pro2=0;

// 获取文件流大小,用于更新进度

long file_length = connection.getContentLength();

while((len = is.read(buf))!=-1){

total_length += len;

if(file_length>0) {

pro1 = (int) ((total_length / (float) file_length) * 100);//传递进度(注意顺序)

}

if(pro1!=pro2) {

// 调用update函数,更新进度

publishProgress(pro2=pro1);

}

os.write(buf, 0, len);

}

}

} catch (MalformedURLException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}finally {

try {

if (is != null) {

is.close();

}

if (os != null) {

os.close();

}

} catch (IOException e) {

e.printStackTrace();

}

if (connection != null) {

connection.disconnect();

}

}

return total_length;

}

@Override

protected void onCancelled(Integer integer) {

super.onCancelled(integer);

}

@Override

protected void onCancelled() {

super.onCancelled();

}

@Override

protected void onProgressUpdate(Integer... values) {

super.onProgressUpdate(values);

builder.setProgress(100,values[0],false);

notificationManager.notify(0x3,builder.build());

//下载进度提示

builder.setContentText("下载"+values[0]+"%");

if(values[0]==100) { //下载完成后点击安装

Intent it = new Intent(Intent.ACTION_VIEW);

it.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

it.setDataAndType(Uri.parse("file:///sdcard/zongzhi.apk"), "application/vnd.android.package-archive");

PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, it, PendingIntent.FLAG_UPDATE_CURRENT);

builder.setContentTitle("下载完成")

.setContentText("点击安装")

.setContentInfo("下载完成")

.setContentIntent(pendingIntent);

notificationManager.notify(0x3, builder.build());

}

}

@Override

protected void onPostExecute(Integer integer) {

super.onPostExecute(integer);

if(integer == 100) {

Toast.makeText(context, "下载完成", Toast.LENGTH_SHORT).show();

}

}

}

2、使用系统服务来实现(不是特别推荐此方法)

//取得系统的下载服务

DownloadManager downloadManager= (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);

//创建下载请求对象

DownloadManager.Request request=new DownloadManager.Request(Uri.parse(downUrl));

request.setDestinationInExternalPublicDir("目录","文件名");

request.setNotificationVisibility(DownloadManager.Request.NETWORK_MOBILE|DownloadManager.Request.NETWORK_WIFI);

request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);

downloadManager.enqueue(request);

总结

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