如何处理下载管理器的不同结果
How to hande different results of DownloadManager
我需要做的事情:
URL使用DownloadManager
下载文件,分别处理下载成功和下载错误。
我尝试了什么:
我使用 BroadcastReceiver
来捕获文件下载的结果。我尝试使用 DownloadManager.ACTION_DOWNLOAD_COMPLETE
作为标记,但它不仅在成功下载文件时触发,而且在发生错误且未下载文件时触发。
因此,似乎 DownloadManager.ACTION_DOWNLOAD_COMPLETE
只报告尝试下载,无论结果如何。
有没有办法只捕获成功的下载?
我的代码:
fragment.kt
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
downloadCompleteReceiver = object : BroadcastReceiver(){
override fun onReceive(context: Context?, intent: Intent?) {
Snackbar.make(requireActivity().findViewById(android.R.id.content), getString(R.string.alert_files_successfully_downloaded), Snackbar.LENGTH_LONG).show()
}
}
val filter = IntentFilter()
filter.addAction(DownloadManager.ACTION_DOWNLOAD_COMPLETE)
requireActivity().registerReceiver(downloadCompleteReceiver, filter)
}
要求:
fun downloadMediaFiles(listOfUrls: List<MediaDto>, activity: Activity, authToken:String) {
if (isPermissionStorageProvided(activity)) {
val manager = activity.getSystemService(Context.DOWNLOAD_SERVICE) as DownloadManager
listOfUrls.forEach {
val request = DownloadManager.Request(Uri.parse(it.url))
request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI or DownloadManager.Request.NETWORK_MOBILE)
request.setTitle(activity.getString(R.string.download_manager_title))
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED)
request.setDestinationInExternalPublicDir(
getDestinationDirectoryFromFileExtension(it.url),
"${System.currentTimeMillis()}"
)
request.addRequestHeader("authorization", authToken)
manager.enqueue(request)
}
}
}
已解决
Rediska 写了什么 + 还需要将其添加到我的 BroadcastReceiver 对象中:
val referenceId = intent!!.getLongExtra(
DownloadManager.EXTRA_DOWNLOAD_ID, -1L
)
然后将此 referenceId
作为论点传递给 getDownloadStatus
。
getDownloadStatus
returns 成功时 8
的整数,失败时 16
的整数,我可以进一步处理。
这个函数会return下载状态。有关值,请参阅 DownloadManager。如果找不到给定 ID 的下载,它 returns -1。
int getDownloadStatus(long id) {
try {
DownloadManager.Query query = new DownloadManager.Query();
query.setFilterById(id);
DownloadManager downloadManager = (DownloadManager)context.getSystemService(Context.DOWNLOAD_SERVICE);
Cursor cursor = downloadManager.query(query);
if (cursor.getCount() == 0) return -1;
cursor.moveToFirst();
return cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_STATUS);
} catch(Exception ex) { return -1; }
}
我需要做的事情:
URL使用DownloadManager
下载文件,分别处理下载成功和下载错误。
我尝试了什么:
我使用 BroadcastReceiver
来捕获文件下载的结果。我尝试使用 DownloadManager.ACTION_DOWNLOAD_COMPLETE
作为标记,但它不仅在成功下载文件时触发,而且在发生错误且未下载文件时触发。
因此,似乎 DownloadManager.ACTION_DOWNLOAD_COMPLETE
只报告尝试下载,无论结果如何。
有没有办法只捕获成功的下载?
我的代码:
fragment.kt
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
downloadCompleteReceiver = object : BroadcastReceiver(){
override fun onReceive(context: Context?, intent: Intent?) {
Snackbar.make(requireActivity().findViewById(android.R.id.content), getString(R.string.alert_files_successfully_downloaded), Snackbar.LENGTH_LONG).show()
}
}
val filter = IntentFilter()
filter.addAction(DownloadManager.ACTION_DOWNLOAD_COMPLETE)
requireActivity().registerReceiver(downloadCompleteReceiver, filter)
}
要求:
fun downloadMediaFiles(listOfUrls: List<MediaDto>, activity: Activity, authToken:String) {
if (isPermissionStorageProvided(activity)) {
val manager = activity.getSystemService(Context.DOWNLOAD_SERVICE) as DownloadManager
listOfUrls.forEach {
val request = DownloadManager.Request(Uri.parse(it.url))
request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI or DownloadManager.Request.NETWORK_MOBILE)
request.setTitle(activity.getString(R.string.download_manager_title))
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED)
request.setDestinationInExternalPublicDir(
getDestinationDirectoryFromFileExtension(it.url),
"${System.currentTimeMillis()}"
)
request.addRequestHeader("authorization", authToken)
manager.enqueue(request)
}
}
}
已解决
Rediska 写了什么 + 还需要将其添加到我的 BroadcastReceiver 对象中:
val referenceId = intent!!.getLongExtra(
DownloadManager.EXTRA_DOWNLOAD_ID, -1L
)
然后将此 referenceId
作为论点传递给 getDownloadStatus
。
getDownloadStatus
returns 成功时 8
的整数,失败时 16
的整数,我可以进一步处理。
这个函数会return下载状态。有关值,请参阅 DownloadManager。如果找不到给定 ID 的下载,它 returns -1。
int getDownloadStatus(long id) {
try {
DownloadManager.Query query = new DownloadManager.Query();
query.setFilterById(id);
DownloadManager downloadManager = (DownloadManager)context.getSystemService(Context.DOWNLOAD_SERVICE);
Cursor cursor = downloadManager.query(query);
if (cursor.getCount() == 0) return -1;
cursor.moveToFirst();
return cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_STATUS);
} catch(Exception ex) { return -1; }
}