下载管理器不能在LG设备上工作 [英] Download manager does not work on LG devices
本文介绍了下载管理器不能在LG设备上工作的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我尝试使用下载管理器执行下载文件。一切工作正常，除了LG设备。这是我的代码：
private void downloadFile（FileInfo fileInfo）{
private DownloadManager manager =（DownloadManager）MyApp。 getSingleton（）。
getApplicationContext（）。getSystemService（Context.DOWNLOAD_SERVICE）;
DownloadManager.Request request = new DownloadManager.Request（Uri.parse（https：//
+ MyPreference.getInstance（）。getBaseUrl（）
+/ api / v3 / files /
+ fileId
+/ get））;
request.setDescription（MyApp.getSingleton（）。getApplicationContext（）。getString（R.string.downloading））;
request.setTitle（fileInfo.getmName（））;
request.addRequestHeader（Authorization，Bearer+ MyPreference.getInstance（）。getAuthToken（））;
request.setNotificationVisibility（DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED）;
文件dir = new File（FileUtil.getInstance（）。getDownloadedFilesDir（））;
if（！dir.exists（））{
dir.mkdirs（）; （new File（FileUtil.getInstance（）。）getDownloadedFilesDir（）+ File.separator + fileInfo.getmName（））））;}
}
request.setDestinationUri（Uri.fromFile
downloadId = manager.enqueue（request）; $（b）
$ Download $ q = new DownloadManager.Query（）;
q.setFilterById（downloadId）;
Cursor cursor = manager.query（q）;
cursor.moveToFirst（）;
int bytes_downloaded = 0;
long bytes_total = 0;
try {
bytes_downloaded = cursor.getInt（cursor
.getColumnIndex（DownloadManager.COLUMN_BYTES_DOWNLOADED_SO_FAR））;
（）; $ b $ catch（CursorIndexOutOfBoundsException e）{
e.printStackTrace（）;
cursor.close（）; $ b $（cursor.getColumnIndexOrThrow（DownloadManager.COLUMN_TOTAL_SIZE_BYTES））; b break;
} catch（IllegalArgumentException e）{
e.printStackTrace（）;
cursor.close（）;
break; （cursor.getInt（cursor.getColumnIndex（DownloadManager.COLUMN_STATUS））== DownloadManager.STATUS_FAILED）{
下载= false;
if（cursor.getInt
cursor.close（）;
onDownloadFail（）;
break;
} else if（cursor.getInt（cursor.getColumnIndex（DownloadManager.COLUMN_STATUS））== DownloadManager.STATUS_SUCCESSFUL）{
downloading = false;
cursor.close（）;
break;
$ b $ if（bytes_total> 0）{
final int dl_progress =（int）（（bytes_downloaded * 100L）/ bytes_total）;
onProgress（dl_progress）;
}
cursor.close（）;
尝试{
Thread.sleep（1000）;
} catch（InterruptedException e）{
e.printStackTrace（）;
}
}
}）。start（）;
$ / code> 在LG设备上
bytes_total = cursor.getInt（cursor.getColumnIndexOrThrow（DownloadManager.COLUMN_TOTAL_SIZE_BYTES））;
返回-1。
下载通知显示在通知栏中，几毫秒后立即消失。没有人例外，没有人进入这段代码。
if（cursor.getInt（cursor.getColumnIndex（DownloadManager.COLUMN_STATUS））= = DownloadManager.STATUS_FAILED）{
下载= false;
cursor.close（）;
onDownloadFail（）;
break; （cursor.getInt（cursor.getColumnIndex（DownloadManager.COLUMN_STATUS））== DownloadManager.STATUS_SUCCESSFUL）{
downloaded = false;
else if（cursor.getInt
cursor.close（）;
break;
}
没什么。所以内部while（）循环永远工作。
在设备LG D802和LG G3 S上测试。两个设备显示相同的行为。
示例：在我的情况下，我的文件的路径是
/storage/emulated/0/MyFolder/n.jpeg
，所以我必须确保 MyFolder 目录存在于init下载管理器之前。
I try to perform downloading the file using DownloadManager. Everything works fine except LG devices. Here is my code:
private void downloadFile(FileInfo fileInfo) {
private DownloadManager manager = (DownloadManager) MyApp.getSingleton().
getApplicationContext().getSystemService(Context.DOWNLOAD_SERVICE);
DownloadManager.Request request = new DownloadManager.Request(Uri.parse("https://"
+ MyPreference.getInstance().getBaseUrl()
+ "/api/v3/files/"
+ fileId
+ "/get"));
request.setDescription(MyApp.getSingleton().getApplicationContext().getString(R.string.downloading));
request.setTitle(fileInfo.getmName());
request.addRequestHeader("Authorization", "Bearer " + MyPreference.getInstance().getAuthToken());
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
File dir = new File(FileUtil.getInstance().getDownloadedFilesDir());
if(!dir.exists()){
dir.mkdirs();
}
request.setDestinationUri(Uri.fromFile(new File(FileUtil.getInstance().getDownloadedFilesDir() + File.separator + fileInfo.getmName())));
downloadId = manager.enqueue(request);
new Thread(() -> {
boolean downloading = true;
while (downloading) {
DownloadManager.Query q = new DownloadManager.Query();
q.setFilterById(downloadId);
Cursor cursor = manager.query(q);
cursor.moveToFirst();
int bytes_downloaded = 0;
long bytes_total = 0;
try {
bytes_downloaded = cursor.getInt(cursor
.getColumnIndex(DownloadManager.COLUMN_BYTES_DOWNLOADED_SO_FAR));
bytes_total = cursor.getInt(cursor.getColumnIndexOrThrow(DownloadManager.COLUMN_TOTAL_SIZE_BYTES));
} catch (CursorIndexOutOfBoundsException e) {
e.printStackTrace();
cursor.close();
break;
} catch (IllegalArgumentException e){
e.printStackTrace();
cursor.close();
break;
}
if (cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_STATUS)) == DownloadManager.STATUS_FAILED) {
downloading = false;
cursor.close();
onDownloadFail();
break;
} else if (cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_STATUS)) == DownloadManager.STATUS_SUCCESSFUL) {
downloading = false;
cursor.close();
break;
}
if (bytes_total > 0) {
final int dl_progress = (int) ((bytes_downloaded * 100L) / bytes_total);
onProgress(dl_progress);
}
cursor.close();
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}).start();
}
On LG devices line
bytes_total = cursor.getInt(cursor.getColumnIndexOrThrow(DownloadManager.COLUMN_TOTAL_SIZE_BYTES));
returns -1. Download notification appears in notification bar and disappears immediately after few milliseconds. No one exception, no one enter this code section
if (cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_STATUS)) == DownloadManager.STATUS_FAILED) {
downloading = false;
cursor.close();
onDownloadFail();
break;
}
else if (cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_STATUS)) == DownloadManager.STATUS_SUCCESSFUL) {
downloading = false;
cursor.close();
break;
}
Just nothing. So internal while() cycle work forever. Tested on devices LG D802 and LG G3 S. Both devices show the same behavior.
解决方案
I faced the same issue and found the solution for this. You need to make sure all the directories exists before init Download Manager. Example: in my case the path to my File is /storage/emulated/0/MyFolder/n.jpeg so I have to make sure MyFolder directory exists before init Download Manager.
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