我正在使用下载管理器从URL下载文件。并且文件已成功下载。
问题
文件正在静默下载,通知区域中没有通知。
下载管理器在我的设备上运行android 6.0上显示通知(带进度条)。我将我的设备更新到Android 7.0后,下载管理器不会在通知区域显示任何通知。
这是我的代码
Uri uri = Uri.parse("file://" + destination);
url = "http:....."; //Valid File URL
//Set up download manager request
DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
request.setDescription("Downloading " + file_name);
request.setTitle("My Downloader");
request.setDestinationUri(uri); //URI is valid
//Start the download
DownloadManager manager = (DownloadManager) getContext()
.getSystemService(Context.DOWNLOAD_SERVICE);
另外添加request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE);
对我的情况没有帮助。
建立信息
这是我的Gradle Build信息。
minSdkVersion 22
targetSdkVersion 23
compileSdkVersion 25
buildToolsVersion "25.0.2"
我遇到了类似的问题,文件正在成功下载,但进度在通知区域中不可见。
问题在于通知可见性。以下行帮助我解决了这个问题:
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
我希望这有帮助。
为什么会发生这种情况?
问题的原因是Android下载管理器的通知在设置中被禁用。 (这是我的Galaxy S7的新默认设置 - SM930W8附带了新的Android N(7.0)更新)
解决方案1
完成上述步骤后,上面的代码下载,通知工作正常。
解决方案2
上述解决方案不适用于应用程序的一般分发。我们无法告诉用户做出解决方案1。
添加您自己的小进度条以显示活动中的下载百分比将使用户知道他/她请求的文件正在下载。
尽量避免通知,因为如果android下载管理器给出相同的通知,那么它是多余的。 (显示通知的默认设置可能会因设备与其所在的ROM有所不同而有所不同)
所以这是代码。
Uri uri = Uri.parse("file://" + destination);
url = "http:....."; //Valid File URL
//Set up download manager request
DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
request.setDescription("Downloading " + file_name);
request.setTitle("My Downloader");
request.setDestinationUri(uri); //URI is valid
//Start the download
DownloadManager manager = (DownloadManager) getContext()
.getSystemService(Context.DOWNLOAD_SERVICE);
final long downloadId = manager.enqueue(request);
final int UPDATE_PROGRESS = 5020;
final Handler handler = new Handler(){
@Override
public void handleMessage(Message msg) {
if(msg.what==UPDATE_PROGRESS){
String downloaded = String.format("%.2f MB", (double)((msg.arg1)/1024)/1024);
String total = String.format("%.2f MB", (double) (msg.arg2)/1024)/1024);
String status = downloaded + " / " + total;
pDialog.setTitleText(status);
}
super.handleMessage(msg);
}
};
new Thread(new Runnable() {
@Override
public void run() {
boolean downloading = true;
while (downloading) {
DownloadManager.Query q = new DownloadManager.Query();
q.setFilterById(downloadId);
Cursor cursor = manager.query(q);
cursor.moveToFirst();
int bytes_downloaded = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_BYTES_DOWNLOADED_SO_FAR));
int bytes_total = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_TOTAL_SIZE_BYTES));
if (cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_STATUS)) == DownloadManager.STATUS_SUCCESSFUL) {
downloading = false;
}
//Post message to UI Thread
Message msg = handler.obtainMessage();
msg.what = UPDATE_PROGRESS;
//msg.obj = statusMessage(cursor);
msg.arg1 = bytes_downloaded;
msg.arg2 = bytes_total;
handler.sendMessage(msg);
cursor.close();
}
}
}).start();
试试这个
DownloadPdf = (Button) findViewById(R.id.downloadpdf);
DownloadPdf.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
File file = new File (Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_DOWNLOADS)+"/Pdf/" + "/" + name + ".pdf");
if (file.exists()) {
Toast.makeText(CatalogDetailActivity.this, "File Sudah ada", Toast.LENGTH_SHORT).show();
} else {
Download_Uri = Uri.parse(testing);
DownloadManager.Request request = new DownloadManager.Request(Download_Uri);
request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI | DownloadManager.Request.NETWORK_MOBILE);
request.setAllowedOverRoaming(false);
request.setTitle("Downloading");
request.allowScanningByMediaScanner();
request.setDescription("Downloading");
request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, "/Pdf/" + "/" + name + ".pdf");
refid = downloadManager.enqueue(request);
}
}
});