Develop Reference

How to delete a file from external storage android studio, using only Uri

So I have taken a look at examples from other people and implemented this.
File delete= new File(uri.getPath());
if(delete.exists()){
Log.d("Delete", "File Exists");
if(delete.delete()){
Log.d("Deleted", ""+uri);
}
else{
Log.d("Unable to delete", ""+uri);
}
}
else{
Log.d("Delete", "File is not found");
}
Now the only problem is that the path name i get is "content://downloads/all_downloads/644", and according to my printed logcat, This file could not be found. Note: This file does exist and I used the same uri to actually play the video. Thank you for your help. EDIT: OK This is how I got my URI.
BroadcastReceiver onComplete = new BroadcastReceiver() {
public void onReceive(Context ctxt, Intent intent) {
Log.d("REFERENCE", "E"+"Entering Broadcast");
long referenceId = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, -1);
uri=( manager.getUriForDownloadedFile(referenceId));
}
};
Now I appreciate very much for the suggestions given bellow, but I am still stuck even after reading the documentation. Suppose I cannot delete using a Uri, is there a way to convert my uri into something useful instead. I don't want to manually enter the address to the location of my files.
#Here is my entire code...
public class Cacher {
private DownloadManager manager;
private Uri uri;
public Cacher(String urlIn , Context context){
Log.d("REFERENCE", "A1- casher");
manager= (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);
Log.d("REFERENCE", "A");
Uri temp=Uri.parse(urlIn);
Log.d("REFERENCE", "B");
DownloadManager.Request request= new DownloadManager.Request(temp);
//
request.setNotificationVisibility(Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
Long reference=manager.enqueue(request);
// Toast.makeText(this,""+reference,Toast.LENGTH_LONG);
Log.d("REFERENCE", "C"+"Downloading video");
Log.d("REFERENCE", "D"+"Setting broadcast");
context.registerReceiver(onComplete,
new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));
Log.d("REFERENCE", "F"+"Now Setting the uri table with");
}
BroadcastReceiver onComplete = new BroadcastReceiver() {
public void onReceive(Context ctxt, Intent intent) {
Log.d("REFERENCE", "E"+"Entering Broadcast");
long referenceId = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, -1);
uri=( manager.getUriForDownloadedFile(referenceId));
}
};
//TODO: Add Utility to remove all Cached Videos
//TODO: Add Utility to delete a single cached video after it has been watched.
public Uri getUri() {
return uri;
}
}

So I have taken a look at examples from other people and implemented this.
That would only work if the Uri has a file scheme and you have write access to the directory that holds the file.
How to delete a file from external storage android studio, using only Uri
Most likely, you don't.
If you get the Uri from ACTION_OPEN_DOCUMENT or ACTION_CREATE_DOCUMENT, wrap the Uri in a DocumentFile using fromSingleUri(), then call delete() on the DocumentFile.
For any other content Uri, you are welcome to try calling delete() on a ContentResolver, but do not expect it to work. There is no requirement that a ContentProvider offer you any way to delete a piece of content. The app that supplies the ContentProvider should have its own way of allowing users to delete things.

So here is the solution to my problem for those who do not want to read through our comments. First, chose a directory to download to. Then use that files path and use the delete() functionality. Keep in mind that once you create a directory with a folder name, you only need to reference the folder name and not the entire path. Here is the code I hope it helps:
String in= GenerateDirectory.createVideoDirectory(context);// Might be useless here.
manager= (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);
Uri temp=Uri.parse(urlIn);
Ringtone r= RingtoneManager.getRingtone(context, temp);
String filename=(r.getTitle(context));
DownloadManager.Request request= new DownloadManager.Request(temp);
request.setDestinationInExternalPublicDir("/secretVideos", filename);
uri=Uri.parse(in+"/"+filename);
Log.d("REFERENCE", "Uri that is returned "+uri);
request.setNotificationVisibility(Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
manager.enqueue(request);
// And then
public void removeCache(){
//TODO: Fix this. For some reason the Uri used gives invalid path name.
Log.d("Delete", "Directory to find ... "+uri);
File delete= new File(uri.getPath());
if(delete.exists()){
Log.d("Delete", "File Exists");
if(delete.delete()){
Log.d("Deleted", ""+uri);
}
}
}
// Where I create the directory
private int RESULT=0;
public static String createVideoDirectory(Context context){
String pathToExternalStorage = Environment.getExternalStorageDirectory().toString();
File appDirectory = new File(pathToExternalStorage + "/" + "secretVideos");
if(!appDirectory.exists()){
Log.d("Directory","Directory DNE");
if(appDirectory.mkdir()) {
Log.d("Directory", "Directory Created");
//Log.d("Directory","Unable to create directory, using default directory");
}
else if(appDirectory.canWrite()){
Log.d("Directory", "Permission given");
}
else{
Log.d("Directory", "Lack of permission");
}
}
else{
Log.d("Directory","Already Exists");
}
return appDirectory.toString();
}
private void writeAndReadPermissions(Context context){
if(ContextCompat.checkSelfPermission(context, permission.WRITE_EXTERNAL_STORAGE)!=PackageManager.PERMISSION_GRANTED){
ActivityCompat.requestPermissions((Activity) context, new String[]{permission.WRITE_EXTERNAL_STORAGE, permission.READ_EXTERNAL_STORAGE}, RESULT);
}
}

DownloadManager COLUMN_LOCAL_FILENAME deprecated

On Android N, i am getting an exception. It is a known issue per the documentation, which asks me to use ContentResolver.openFileDescriptor()
https://developer.android.com/reference/android/app/DownloadManager.html#COLUMN_LOCAL_FILENAME
I am not sure how to use. Where is the ContentResolver object here that I can use to get the filename? I never used it. So, I will appreciate any help.
08-04 11:20:59.765 7010 7290 W System.err: java.lang.SecurityException: COLUMN_LOCAL_FILENAME is deprecated; use ContentResolver.openFileDescriptor() instead
08-04 11:20:59.765 7010 7290 W System.err: at android.app.DownloadManager$CursorTranslator.getString(DownloadManager.java:1499)
Here is my code.
DownloadManager.Query query = new DownloadManager.Query();
query.setFilterById(id);
Cursor cursor = downloadManager.query(query);
final String downloadFilePath = cursor.getString(cursor.getColumnIndex(DownloadManager.COLUMN_LOCAL_FILENAME));
cursor.close();
I tried the downlaodManager.getFileUri, but isn't what I am looking for. Appreciate any help.
Thanks

The following is working for me now:
String downloadFilePath = null;
String downloadFileLocalUri = cursor.getString(cursor.getColumnIndex(DownloadManager.COLUMN_LOCAL_URI));
if (downloadFileLocalUri != null) {
File mFile = new File(Uri.parse(downloadFileLocalUri).getPath());
downloadFilePath = mFile.getAbsolutePath();
}

I solve this issue by using DownloadManager.COLUMN_LOCAL_URI instead of DownloadManager.COLUMN_LOCAL_FILENAME
DownloadManager.COLUMN_LOCAL_URI returns file path including "file://" so you have to exclude it from your downloadFilePath by using downloadFilePath = downloadFilePath.replace("file://","");
Here is one line solution of this issue:
String downloadFilePath = (c.getString(c.getColumnIndex(DownloadManager.COLUMN_LOCAL_URI))).replace("file://","");
Check below complete code of DownloadManager:
DownloadFinishedReceiver.java
public class DownloadFinishedReceiver extends BroadcastReceiver {
#Override
public void onReceive(final Context context, Intent intent) {
String action = intent.getAction();
if (DownloadManager.ACTION_DOWNLOAD_COMPLETE.equals(action) && intent.getExtras()!=null) {
Bundle extras = intent.getExtras();
DownloadManager.Query q = new DownloadManager.Query();
long downloadId = extras.getLong(DownloadManager.EXTRA_DOWNLOAD_ID);
q.setFilterById(downloadId);
Cursor c = ((DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE)).query(q);
if (c.moveToFirst()) {
int status = c.getInt(c.getColumnIndex(DownloadManager.COLUMN_STATUS));
if (status == DownloadManager.STATUS_SUCCESSFUL) {
String downloadFilePath = (c.getString(c.getColumnIndex(DownloadManager.COLUMN_LOCAL_URI))).replace("file://","");
String downloadTitle = c.getString(c.getColumnIndex(DownloadManager.COLUMN_TITLE));
c.close();
Log.e("DownloadPath", downloadFilePath); // Print DownloadPath in Logcat
Log.e("DownloadTitle", downloadTitle); // Print DownloadTitle in Logcat
} else if (status == DownloadManager.STATUS_FAILED) {
removeTempOnFailure(context, downloadId);
}
}
}
}
// Remove temp/cache data
private void removeTempOnFailure(Context con, long downloadId) {
File cacheFileDir = new File(con.getCacheDir().getAbsolutePath());
for (File f : cacheFileDir.listFiles()) {
if (f.getName().contains(String.valueOf(downloadId))) {
f.delete();
break;
}
}
}
}
Register BroadcastReceiver in AndroidMenifest.xml file:
<receiver
android:name="com.example.receiver.DownloadFinishedReceiver"
android:exported="true"
android:process=".downloadFinished">
<intent-filter>
<action android:name="android.intent.action.DOWNLOAD_COMPLETE" />
</intent-filter>
</receiver>
Put below method in your Activity and pass appropriate arguments:
/**
*
* #param downloadUrl -> Your file download url
* #param downloadTitle -> Your file title to display in download manager
* #param fileName -> filename with extension like music.mp3 it will store in download folder
* #param hide -> true to hide downloadmanager in status bar, false to display it
* #return -> it will return downloadId
*/
private long downloadFromUrl(String downloadUrl, String downloadTitle, String fileName, boolean hide) {
Uri uri = Uri.parse(downloadUrl);
DownloadManager.Request request = new DownloadManager.Request(uri);
request.setTitle(downloadTitle);
if (hide) {
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_HIDDEN);
request.setVisibleInDownloadsUi(false);
} else
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, fileName);
DownloadManager manager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
return manager != null ? manager.enqueue(request) : 0;
}
If you are passing hide = true in above method then you have to add following permission in AndroidManifext.xml
<uses-permission android:name="android.permission.DOWNLOAD_WITHOUT_NOTIFICATION"/>

Use the getUriForDownloadedFile to get the downloaded Uri.
DownloadManager downloadManager = DownloadManager.class.cast(getSystemService(DOWNLOAD_SERVICE));
Uri uri = downloadManager.getUriForDownloadedFile(id);

String downloadFileLocalUri = cursor.getString(cursor.getColumnIndex(DownloadManager.COLUMN_LOCAL_URI));
Above method may cause CursorIndexOutOfBoundsException in case of empty list of rows.
A Cursor is an object, which is positioned before the first entry. So we should first check if there is any result at all. Here is my example:
int index = cursor.getColumnIndex(DownloadManager.COLUMN_LOCAL_URI);
if (cursor.moveToFirst()) {
String downloadFileLocalUri = cursor.getString(index);
if (downloadFileLocalUri != null) {
File mFile = new File(downloadFileLocalUri);
downloadFileName = mFile.getName();
downloadFilePath = mFile.getAbsolutePath();
}
}
cursor.close();

For whoever finds this useful
I had to use DownloadManager.COLUMN_URI
instead of DownloadManager.COLUMN_LOCAL_URI
Here are my results for each respective column
c.getString(c.getColumnIndex(DownloadManager.COLUMN_LOCAL_URI)) -> content://downloads/my_downloads/46
c.getString(c.getColumnIndex(DownloadManager.COLUMN_URI)) -> http://test-domain.com/files/encrypted/212125/bsd1e-411cd7-e3229fb-fdddsa12a974.pdf
c.getString(c.getColumnIndex(DownloadManager.COLUMN_LOCAL_FILENAME)) -> http://test-domain.com/files/encrypted/212125/bsd1e-411cd7-e3229fb-fdddsa12a974.pdf

techtinkerer's answer also didn't work for me because I wasn't always getting a file URI, as CommonsWare pointed out, but often a content URI. But there are several ways you can still get the file from the content URI.
1) You can call getContentResolver().openInputStream(myContentUri) to get an input stream, that you can then write to a file you create in external or internal storage.
2) You can call getContentResolver().openFileDescriptor(myContentUri, "r") to open a read-only ParcelFileDescriptor. While you cannot get an absolute file path from a ParcelFileDescriptor, a lot of methods that accept files or URIs also accept ParcelFileDescriptor.
For example I was using DownloadManager to download a PDF then open it with a PdfRenderer, whose constructor accepts a ParcelFileDescriptor:
PdfRenderer renderer;
ParcelFileDescriptor pdfFileDescriptor = getContentResolver().openFileDescriptor(pdfUri, "r");
if (pdfFileDescriptor != null) renderer = new PdfRenderer(pdfFileDescriptor);
pdfFileDescriptor.close();
For another example, BitmapFactory also has a method to decode a ParcelFileDescriptor:
(from https://developer.android.com/guide/topics/providers/document-provider.html)
private Bitmap getBitmapFromUri(Uri uri) throws IOException {
ParcelFileDescriptor parcelFileDescriptor =
getContentResolver().openFileDescriptor(uri, "r");
FileDescriptor fileDescriptor = parcelFileDescriptor.getFileDescriptor();
Bitmap image = BitmapFactory.decodeFileDescriptor(fileDescriptor);
parcelFileDescriptor.close();
return image;
}
So depending on what you want to do, a ParcelFileDescriptor may be all that you need.

You can decrease the targetSdk less than 24 in gradle.Actually this approach is not a recommended approach but we can overcome this error by decreasing the target sdk 23 or anything(but less than 24) as well.

Android download list of files with callback

I've got an Activity from which i need to download and save list of files. Files and names are stored in Map <String,String>. After downloading all files I need to call function in my Activity.
I've already have AsyncTask class which downloads and saves files and an interface which callbacks to Activity.
How can i pass Map<String,String> to Asynctask or maybe there is another solutions?
Thanks.

This is not something that is suitable for an AsyncTask. You should look into implementing a custom Service, probably an IntentService.
There's a very good tutorial at http://www.vogella.com/tutorials/AndroidServices/article.html

I would recommend using Android DownloadManager and a list of IDs
DownloadManager downloadmanager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
Uri uri = Uri.parse("http://www.example.com/myfile.mp3");
DownloadManager.Request request = new DownloadManager.Request(uri);
request.setTitle("My File");
request.setDescription("Downloading");
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
request.setVisibleInDownloadsUi(false);
request.setDestinationUri(Uri.parse("file://" + folderName + "/myfile.mp3"));
mList_refid.add(downloadmanager.enqueue(request));
To setup a callback, use registerReceiver
mList_refid = new ArrayList<>();
mDownloadReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context arg0, Intent intent) {
String action = intent.getAction();
if (DownloadManager.ACTION_DOWNLOAD_COMPLETE.equals(action)) {
long downloadId = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, 0);
if (mList_refid != null && mList_refid.contains(downloadId)) {
mList_refid.remove(downloadId); // File is downloaded, remove it from ID list.
}
} else
Log.e(LOG, "BroadcastReceiver on receive action not handled : " + action);
}
};
registerReceiver(mDownloadReceiver, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));

How to Enable Android Download Manager

I'm using Android Download Manager to download list of files. Lately I came across a crash report saying
Unknown java.lang.IllegalArgumentException: Unknown URL content://downloads/my_downloads
Then later, I figured it out that the reason is because user disabled Android Download Manager. I check if the Download Manager is disabled by checking it's package name with the code below.
int state = this.getPackageManager().getApplicationEnabledSetting("com.android.providers.downloads");
And now, I need to find a way to enable the Download Manager if it is disabled. I tried setting it's enable state with the permission in Manifest but I keep getting Security Exception.
this.getPackageManager().setApplicationEnabledSetting("com.android.providers.downloads", PackageManager.COMPONENT_ENABLED_STATE_DEFAULT, 0);
<uses-permission android:name="android.permission.CHANGE_COMPONENT_ENABLED_STATE"/>
So I thought it might not be reachable because of it is a system app. (Google Play App does it).
Is there any way to redirect the user to the Download Manager Application Info view ? to let the user enables it ? If there is no way to enable it on run time programmatically.

Please edit my answer if is not valid
Check if download manager is available:
int state = this.getPackageManager().getApplicationEnabledSetting("com.android.providers.downloads");
if(state==PackageManager.COMPONENT_ENABLED_STATE_DISABLED||
state==PackageManager.COMPONENT_ENABLED_STATE_DISABLED_USER
||state==PackageManager.COMPONENT_ENABLED_STATE_DISABLED_UNTIL_USED){
// Cannot download using download manager
}
else {
request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, fileName);
request.setDescription(fileName);
manager.enqueue(request);
}
And the solution for trying to enable download manager is:
packageName = "com.android.providers.downloads"
try {
//Open the specific App Info page:
Intent intent = new Intent(android.provider.Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
intent.setData(Uri.parse("package:" + packageName));
startActivity(intent);
} catch ( ActivityNotFoundException e ) {
//e.printStackTrace();
//Open the generic Apps page:
Intent intent = new Intent(android.provider.Settings.ACTION_MANAGE_APPLICATIONS_SETTINGS);
startActivity(intent);
}

Some folks were looking for an answer to this question and I just realized that the Answer made to this question is somehow deleted. So I want to answer my own question.
There is no way to activate/deactivate Download Manager directly, since it's system application and we don't have access to it.
Only alternative left is to redirect the User to the Info Page of Download Manager Application.
try {
//Open the specific App Info page:
Intent intent = new Intent(android.provider.Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
intent.setData(Uri.parse("package:" + "com.android.providers.downloads"));
startActivity(intent);
} catch ( ActivityNotFoundException e ) {
e.printStackTrace();
//Open the generic Apps page:
Intent intent = new Intent(android.provider.Settings.ACTION_MANAGE_APPLICATIONS_SETTINGS);
startActivity(intent);
}

Google Gmail Inbox has check whether the DownloadManager is been disabled,if true then show an AlertDialog to tell user to enable the DownloadManager in Settings.The screenshot show below:
I wrote a class called DownloadManagerResolver to fix this,hope this can help your.:)
public final class DownloadManagerResolver {
private static final String DOWNLOAD_MANAGER_PACKAGE_NAME = "com.android.providers.downloads";
/**
* Resolve whether the DownloadManager is enable in current devices.
*
* #return true if DownloadManager is enable,false otherwise.
*/
public static boolean resolve(Context context) {
boolean enable = resolveEnable(context);
if (!enable) {
AlertDialog alertDialog = createDialog(context);
alertDialog.show();
}
return enable;
}
/**
* Resolve whether the DownloadManager is enable in current devices.
*
* #param context
* #return true if DownloadManager is enable,false otherwise.
*/
private static boolean resolveEnable(Context context) {
int state = context.getPackageManager()
.getApplicationEnabledSetting(DOWNLOAD_MANAGER_PACKAGE_NAME);
if (Build.VERSION.SDK_INT > Build.VERSION_CODES.JELLY_BEAN_MR2) {
return !(state == PackageManager.COMPONENT_ENABLED_STATE_DISABLED ||
state == PackageManager.COMPONENT_ENABLED_STATE_DISABLED_USER
|| state == PackageManager.COMPONENT_ENABLED_STATE_DISABLED_UNTIL_USED);
} else {
return !(state == PackageManager.COMPONENT_ENABLED_STATE_DISABLED ||
state == PackageManager.COMPONENT_ENABLED_STATE_DISABLED_USER);
}
}
private static AlertDialog createDialog(final Context context) {
AppCompatTextView messageTextView = new AppCompatTextView(context);
messageTextView.setTextSize(16f);
messageTextView.setText("DownloadManager is disabled. Please enable it.");
return new AlertDialog.Builder(context)
.setView(messageTextView, 50, 30, 50, 30)
.setPositiveButton("ok", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
enableDownloadManager(context);
}
})
.setCancelable(false)
.create();
}
/**
* Start activity to Settings to enable DownloadManager.
*/
private static void enableDownloadManager(Context context) {
try {
//Open the specific App Info page:
Intent intent = new Intent(android.provider.Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
intent.setData(Uri.parse("package:" + DOWNLOAD_MANAGER_PACKAGE_NAME));
context.startActivity(intent);
} catch (ActivityNotFoundException e) {
e.printStackTrace();
//Open the generic Apps page:
Intent intent = new Intent(android.provider.Settings.ACTION_MANAGE_APPLICATIONS_SETTINGS);
context.startActivity(intent);
}
}
}

May be it's help to you.
downloadManager = (DownloadManager)getSystemService(DOWNLOAD_SERVICE);
DownloadManager.Request request = new DownloadManager.Request(Download_Uri);
//Restrict the types of networks over which this download may proceed.
request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI | DownloadManager.Request.NETWORK_MOBILE);
//Set whether this download may proceed over a roaming connection.
request.setAllowedOverRoaming(false);
//Set the title of this download, to be displayed in notifications (if enabled).
request.setTitle("My Data Download");
//Set a description of this download, to be displayed in notifications (if enabled)
request.setDescription("Android Data download using DownloadManager.");
//Set the local destination for the downloaded file to a path within the application's external files directory
request.setDestinationInExternalFilesDir(this,Environment.DIRECTORY_DOWNLOADS,"CountryList.json");
//Enqueue a new download and same the referenceId
downloadReference = downloadManager.enqueue(request);
http://www.mysamplecode.com/2012/09/android-downloadmanager-example.html

Launch Adobe Reader in Android App

I have an Android app where I intercept a PDF file download event in the WebView, download it using the DownloadManager, and launch a new intent with the Adobe Reader to display the file. It works fine, except that when the Adobe Reader starts, it displays the following message prior to displaying the actual file:
Read-only document | To modify this document save a copy on your device.
Save | View Read-only
After I dismiss this prompt, the document gets displayed correctly. How can I get rid of the Read-only prompt?
Here is my code:
public class MyDownloadListener implements DownloadListener {
MainActivity activity;
BroadcastReceiver receiver;
DownloadManager downloadManager;
public MyDownloadListener(MainActivity a) {
activity = a;
downloadManager = (DownloadManager) activity.getSystemService(Context.DOWNLOAD_SERVICE);
receiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (DownloadManager.ACTION_DOWNLOAD_COMPLETE.equals(action)) {
long downloadId = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, 0);
Query query = new Query();
query.setFilterById(downloadId);
Cursor c = downloadManager.query(query);
if (c.moveToFirst()) {
int columnIndex = c.getColumnIndex(DownloadManager.COLUMN_STATUS);
if (DownloadManager.STATUS_SUCCESSFUL == c.getInt(columnIndex)) {
String uriString = c.getString(c.getColumnIndex(DownloadManager.COLUMN_LOCAL_FILENAME));
File fileSrc = new File(uriString);
Intent intentPdf = new Intent(Intent.ACTION_VIEW);
intentPdf.setDataAndType(Uri.fromFile(fileSrc), "application/pdf");
intentPdf.setPackage("com.adobe.reader");
intentPdf.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
activity.startActivity(intentPdf);
}
}
}
}
};
activity.registerReceiver(receiver, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));
}
#Override
public void onDownloadStart(String url, String userAgent, String contentDisposition, String mimetype, long contentLength) {
Request request = new Request(Uri.parse(url));
downloadManager.enqueue(request);
}
}

As per the official documentation of class DownloadManager.Request
This class contains all the information necessary to request a new
download. The URI is the only required parameter. Note that the
default download destination is a shared volume where the system might
delete your file if it needs to reclaim space for system use. If this
is a problem, use a location on external storage (see
setDestinationUri(Uri).
So default location is more of a cache location and system can delete the file if it require more space. So if you want to kep the file then you can use setDestinationUri to provide the path in the SD card..
And it looks like the default space does not allow any other thread/process other then the download manager to write file in that space, hence the read only message from the adobe reader..