问题描述
我想让我的APP监听下载管理器发送的下载完成操作,然后更改VideoView源以播放新下载的视频。
我的代码结构如下:
- MainActivity.java:运行UI线程,每15分钟启动一次Job Scheduler,以检查是否有新视频可用。
- TriggerJobService.java:启动一个新线程以执行工作流程,包括下载新视频,重置VideoView。
我在TriggerJobService.java中初始化广播接收器
public class TriggerJobService extends JobService {
...
public BroadcastReceiver onDownloadComplete;
public int downloadFlag = 0;
public long downloadID;
...
private void downloadFile(String newName) throws JSONException {
Log.d(TAG,newName);
String link = "link/to/new/video" + newName;
Uri uri = Uri.parse(link);
String destName = "v" + newName;
DownloadManager downloadmanager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
DownloadManager.Request request = new DownloadManager.Request(uri);
request.setDescription("Downloading");
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
request.setVisibleInDownloadsUi(false);
request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS,destName);
downloadID = downloadmanager.enqueue(request);
Log.d(TAG,String.valueOf(downloadID));
onDownloadComplete = new BroadcastReceiver() {
@Override
public void onReceive(Context context,Intent intent) {
//Fetching the download id received with the broadcast
Log.d(TAG,"inside onDownloadComplete");
long id = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID,-1);
//Checking if the received broadcast is for our enqueued download by matching download id
if (downloadID == id) {
Log.d(TAG,"downloadFile: Successfully downloaded file.");
downloadFlag = 1;
}
}
};
}
...
private void mWorkflow(final JobParameters param) {
...
downloadFile(fileName);
if(downloadFlag == 1){
resetVideo(mVideoView,fileNameNew);
}else{
Log.d(TAG,"download failed");
}
...
}
我注册广播接收器,并每隔15分钟在MainActivity.java中启动作业服务:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
scheduleJob();
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) {
TriggerJobService tjs = new TriggerJobService();
registerReceiver(tjs.onDownloadComplete,new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));
}
...
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
public void scheduleJob() {
ComponentName componentName = new ComponentName(this,TriggerJobService.class);
JobInfo info = new JobInfo.Builder(123,componentName)
.setRequiresCharging(true)
.setRequiredNetworkType(JobInfo.NETWORK_TYPE_UNMETERED)
.setPersisted(true)
.setPeriodic(15 * 60 * 1000)
.build();
JobScheduler scheduler = (JobScheduler) getSystemService(JOB_SCHEDULER_SERVICE);
int resultCode = scheduler.schedule(info);
if (resultCode == JobScheduler.RESULT_SUCCESS) {
Log.d(TAG,"Job scheduled");
} else {
Log.d(TAG,"Job scheduling failed");
}
}
但是我总会收到一条日志,上面写着“下载失败”,这表明接收者从未从下载管理器中获得下载完成操作。
P.S .:我确保工作流程的其他部分都能正常工作。
我该如何解决?谢谢!!
解决方法
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