我有一个带有recycleler-view的活动，每个列表项都有一个下载按钮。内部按钮点击事件我管理下载调用服务。当用户点击多个下载按钮时，如何管理队列通知更新。
我用Google搜索并尝试了一些解决方案：
1.How to Manage Queue of Runnable Tasks in Android
2.how to handle a queue in android?? java
3.Best way to update Activity from a Queue
但找不到使用通知更新实现队列的正确方法。
这是我的DownloadService代码：
New elements is added:
(
10,
11
)
任何帮助都会得到满足......
答案 0 :(得分：1)
最后得到了我自己的问题的答案。 我使用java.util包中的Queue类来管理它。 我使用的代码如下：
public class DownloadApkService extends Service {
private NotificationManager notificationManager = null;
String downloadLocation;
String appId = null;
String appLink = null;
String appName = null;
String isApkFromServer = null;
public boolean isDownloading = false;
public static Queue<QueueData> downloadQueue = new LinkedList<>();
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onCreate() {
super.onCreate();
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
if (isDownloading) {
QueueData queueData = new QueueData();
queueData.setAppId(intent.getStringExtra(Constants.COM_APP_ID));
queueData.setAppLink(intent.getStringExtra(Constants.COM_APP_LINK));
queueData.setIsApkFromServer(intent.getStringExtra(Constants.COM_APK_FROM_SERVER));
queueData.setAppName(intent.getStringExtra(Constants.COM_APP_NAME));
downloadQueue.add(queueData);
Intent intentQueueingApk = new Intent();
intentQueueingApk.setAction(Constants.ACTION_QUEUEING_APK);
sendBroadcast(intentQueueingApk);
return START_NOT_STICKY;
} else {
appId = intent.getStringExtra(Constants.COM_APP_ID);
appLink = intent.getStringExtra(Constants.COM_APP_LINK);
appName = intent.getStringExtra(Constants.COM_APP_NAME);
isApkFromServer = intent.getStringExtra(Constants.COM_APK_FROM_SERVER);
}
Thread thread = new Thread(new MyThread());
thread.start();
return START_NOT_STICKY;
}
@Override
public void onDestroy() {
super.onDestroy();
if (notificationManager != null) {
notificationManager.cancel(0);
}
}
class MyThread implements Runnable {
MyThread() {
}
@Override
public void run() {
notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(DownloadApkService.this)
.setSmallIcon(R.mipmap.ic_launcher)
.setContentTitle(appName).setProgress(0, 0, true)
.setContentText(getResources().getText(R.string.downloading_notification))
.setOngoing(true)
.setAutoCancel(true);
notificationManager.notify(0, notificationBuilder.build());
new DownloadFileFromURL().execute(appLink);
}
}
public void installApk(Uri uri) {
Intent install = new Intent(Intent.ACTION_VIEW);
install.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
install.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
install.setDataAndType(uri,
"application/vnd.android.package-archive");
DownloadApkService.this.startActivity(install);
}
/**
* Background Async Task to download file
*/
class DownloadFileFromURL extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Bar Dialog
*/
@Override
protected void onPreExecute() {
super.onPreExecute();
isDownloading = true;
Intent intentResponse = new Intent();
intentResponse.setAction(Constants.ACTION_DOWNLOADING_APK);
intentResponse.putExtra(Constants.COM_APP_ID, appId);
intentResponse.putExtra(Constants.COM_APK_DOWNLOAD_PERCENTAGE, "0");
sendBroadcast(intentResponse);
}
/**
* Downloading file in background thread
*/
@Override
protected String doInBackground(String... f_url) {
int count;
HttpURLConnection connection=null;
try {
String link=f_url[0].replace(" ","%20");
URL url = new URL(link);
connection = (HttpURLConnection) url.openConnection();
connection.setRequestProperty("Accept-Encoding", "identity");
int lenghtOfFile = connection.getContentLength();
connection.connect();
// this will be useful so that you can show a tipical 0-100%
// progress bar
// download the file
InputStream input = new BufferedInputStream(connection.getInputStream());
downloadLocation = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS) + "/";
String fileName = appName + ".apk";
downloadLocation += fileName;
File sourceFile = new File(downloadLocation);
if (sourceFile.exists()) {
sourceFile.delete();
}
// Output stream
FileOutputStream output = new FileOutputStream(downloadLocation);
byte data[] = new byte[1024];
long total = 0;
while ((count = input.read(data)) != -1) {
total += count;
// publishing the progress....
// After this onProgressUpdate will be called
publishProgress("" + (int) ((total * 100) / lenghtOfFile));
// writing data to file
output.write(data, 0, count);
}
// flushing output
output.flush();
// closing streams
output.close();
input.close();
} catch (Exception e) {
return "fail";
}finally {
if(connection != null)
connection.disconnect();
}
return "success";
}
/**
* Updating progress bar
*/
protected void onProgressUpdate(String... progress) {
// setting progress percentage
Intent intentResponse = new Intent();
intentResponse.setAction(Constants.ACTION_DOWNLOADING_APK);
intentResponse.putExtra(Constants.COM_APP_ID, appId);
intentResponse.putExtra(Constants.COM_APK_DOWNLOAD_PERCENTAGE, progress[0]);
sendBroadcast(intentResponse);
Intent intentQueueingApk = new Intent();
intentQueueingApk.setAction(Constants.ACTION_QUEUEING_APK);
sendBroadcast(intentQueueingApk);
}
/**
* After completing background task Dismiss the progress dialog
**/
@Override
protected void onPostExecute(String file_url) {
notificationManager.cancel(0);
if (file_url.equals("success")) {
Intent intentResponse = new Intent();
intentResponse.setAction(Constants.ACTION_DOWNLOADING_APK_COMPLETE);
intentResponse.putExtra(Constants.COM_APP_ID, appId);
sendBroadcast(intentResponse);
isDownloading = false;
if (isApkFromServer!=null && isApkFromServer.equals("0")) {
Intent intent = new Intent(DownloadApkService.this, UploadApkService.class);
intent.putExtra(Constants.COM_APP_ID, mAppDetails.getId());
intent.putExtra(Constants.COM_APK_FILE_PATH, downloadLocation);
startService(intent);
}
installApk(Uri.fromFile(new File(downloadLocation)));
} else if (file_url.equals("fail")) {
isDownloading = false;
Intent intentResponse = new Intent();
intentResponse.setAction(Constants.ACTION_DOWNLOADING_APK_FAILED);
intentResponse.putExtra(Constants.COM_APP_ID, appId);
sendBroadcast(intentResponse);
}
if (/*isDownloading &&*/ !downloadQueue.isEmpty()) {
QueueData queueData = downloadQueue.poll();
appId = queueData.getAppId();
appLink = queueData.getAppLink();
appName = queueData.getAppName();
isApkFromServer = queueData.getIsApkFromServer();
Thread thread = new Thread(new MyThread());
thread.start();
}
}
}
@Override
public void onTaskRemoved(Intent rootIntent) {
if (notificationManager != null)
notificationManager.cancel(0);
}
}
我希望这会对某人有所帮助。