-edit: i would love some input on what i am doing wrong here why is this not working i am currently working on a college project which has a deadline pretty soon i looked at a lot of tutorials online but nothing seems to address this topic specifically for android 11 everyone seems to be using mediastore api
-edit-2: i dont understand what i am doing wrong also i have not gotten any response yet i am not able to figure out the error this is for my college project i would be very thankful if someone helped me in finding out what is wrong why is this not getting any traction i am unsure
I want to add images to a custom directory in android 11 + i have an array of bitmaps and would like to store images in a custom directory
here are my permissions in manifest file
<uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE"
tools:ignore="ScopedStorage" />
<!-- Without this entry storage-permission entry will not be visible under app-info permissions list Android-10 and below -->
<uses-permission
android:name="android.permission.WRITE_EXTERNAL_STORAGE"
android:maxSdkVersion="29"
tools:ignore="ScopedStorage"/>
here is the java code
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R && false == Environment.isExternalStorageManager()) {
Uri uri = Uri.parse("package:" + BuildConfig.APPLICATION_ID);
startActivity(new Intent(Settings.ACTION_MANAGE_APP_ALL_FILES_ACCESS_PERMISSION, uri));
}
File direct = new File(Environment.getExternalStorageDirectory() + "/LaundryImages");
if (!direct.exists()) {
File wallpaperDirectory = new File(Environment.getExternalStorageDirectory() + "/LaundryImages");
wallpaperDirectory.mkdir();
}
String name = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss", Locale.getDefault()).format(new Date());
TextView tv = (TextView)findViewById(R.id.textView);
File direct2 = new File(Environment.getExternalStorageDirectory() + "/LaundryImages/"+name);
direct2.mkdir();
int i=0;
for (Bitmap bm : l) {
i++;
// tv.setText(String.valueOf(i));
File file = new File(direct2,String.valueOf(i)+".jpg");
try {
FileOutputStream out = new FileOutputStream(file);
if(file == null)tv.setText("null");
bm.compress(Bitmap.CompressFormat.JPEG, 100, out);
out.flush();
out.close();
} catch (Exception e) {
e.printStackTrace();
}
}
i tried to run it but it does not work it is creating the directories properly but it does not add the images
i tried to add images in the folder used permissions as i found on the internet and also checked whether permissions were there in my phone but still the images wont store
I cannot create directory, I have all the permissions and this in my Manifest:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
In MainActivity onCreate, checks permission, if it has it should create a directory but it always returns a false:
if (!checkPermission()) requestPermission();
else {
File folder = new File(Environment.getExternalStorageDirectory() +
File.separator + "receipts");
if (!folder.exists()) {
boolean bool = folder.mkdirs();
System.out.println(bool);
}
}
Any clue or hint to why? Thanks
Unfortunately, with the security updates brought by Android 11 and up, as #CommonsWare said, you simply can't write directories on external storage (sdcard).
Straight from the docs:
Access to directories
You can no longer use the ACTION_OPEN_DOCUMENT_TREE intent action to
request access to the following directories:
The root directory of the internal storage volume.
The root directory of each SD card volume that the device manufacturer considers to be reliable, regardless of whether the card
is emulated or removable. A reliable volume is one that an app can
successfully access most of the time.
The Download directory.
Additionally from the same place:
App-specific directory on external storage Starting in Android 11, apps
cannot create their own app-specific directory on external storage. To
access the directory that the system provides for your app, call
getExternalFilesDirs().
Your app has a system generated directory to store any information. This makes sense, of course, because at any given time the user could remove/format the sd card inside the device, and your app's data would be entirely lost.
From more docs:
You would use this to write:
//Write to a file
String filename = "myfile";
String fileContents = "Hello world!";
try (FileOutputStream fos = context.openFileOutput(filename, Context.MODE_PRIVATE)) {
fos.write(fileContents.toByteArray());
}
And to read a file:
//To read from the file
FileInputStream fis = context.openFileInput(filename
);
InputStreamReader inputStreamReader =
new InputStreamReader(fis, StandardCharsets.UTF_8);
StringBuilder stringBuilder = new StringBuilder();
try (BufferedReader reader = new BufferedReader(inputStreamReader)) {
String line = reader.readLine();
while (line != null) {
stringBuilder.append(line).append('\n');
line = reader.readLine();
}
} catch (IOException e) {
// Error occurred when opening raw file for reading.
} finally {
String contents = stringBuilder.toString();
}
These are both within your app's "sandbox" folder. Because of this, you do not need to declare permissions.
File folder = new File(Environment.getExternalStorageDirectory() +
File.separator + "receipts");
Change to:
File folder = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOCUMENTS), "receipts");
I am developing an app. In which I am uploading different file types (e.g. docx, pdf, zip) to a WAMP Server. Below is path of file to my internal Storage.
/storage/emulated/0/WhatsApp/Media/WhatsApp Documents/api.txt
I have added and allowed storage permission in Manifest file and also on runtime for reading a file. However there is no Internal Storage Permission request available.
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
and also for Android 10 I was using this attribute also
android:requestLegacyExternalStorage="true"
But I am getting this error on Android 11 OS a.k.a Android R onboard Samsung Galaxy when I am reading file from Internal Storage for uploading.
java.io.FileNotFoundException: /storage/emulated/0/WhatsApp/Media/WhatsApp Documents/api.txt: open failed: EACCES (Permission denied)
On An Android 11 device your app only has access to its own files.
And to general mediafies in public directories.
Try to list the files in that whatsapp directory and you will see that
they are not listed.
You have two options to read the file.
Let the user pick the file with ACTION_OPEN_DOCUMENT. Request
MANAGE_EXTERNAL_STORAGE in manifest and let the user confirm.
Ordinary request is not working for the MANAGE_EXTERNAL_STORAGE permission. This permission must be set in Android setting by user.
You can try to use the android:preserveLegacyExternalStorage="true" tag in the manifest file in the application tag. This tag is used to access the storage in the android 11 devices. And for more detail follow this link it will explain you more as per your requirement.
I search a lot of time and get the solution that adds <uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE"/> in the manifest file and try to get the file access permission in the android 11 phones. Then you will open and read the file from the storage.
But the thing is that the play store does not allow you to use of the MANAGE_EXTERNAL_STORAGE permission in your app. it will take time to give access to the developer to use it to access all the files.
Here the link is
For Android 11 or above use the code below on the onCreate() of the activity. It will run once and ask for permission.
if (Build.VERSION.SDK_INT >= 30){
if (!Environment.isExternalStorageManager()){
Intent getpermission = new Intent();
getpermission.setAction(Settings.ACTION_MANAGE_ALL_FILES_ACCESS_PERMISSION);
startActivity(getpermission);
}
}
Next declare the MANAGE_EXTERNAL_STORAGE permission in the manifest.
However, the problem with this method is that you cannot upload it to play store if you don't have a good reason on why you need access to all files.
On An Android 11 device your app only has access to its own files.
And to general mediafies in public directories.
Try to list the files in that whatsapp directory and you will see that they are not listed.
You have two options to read the file.
Let the user pick the file with ACTION_OPEN_DOCUMENT.
Request MANAGE_EXTERNAL_STORAGE in manifest and let the user confirm.
Try to get path with this method.....
public static String getDriveFile(Context context, Uri uri) {
Uri returnUri = uri;
Cursor returnCursor = context.getContentResolver().query(returnUri, null, null, null, null);
int nameIndex = returnCursor.getColumnIndex(OpenableColumns.DISPLAY_NAME);
int sizeIndex = returnCursor.getColumnIndex(OpenableColumns.SIZE);
returnCursor.moveToFirst();
String name = (returnCursor.getString(nameIndex));
String size = (Long.toString(returnCursor.getLong(sizeIndex)));
File file = new File(context.getCacheDir(), name);
try {
InputStream inputStream = context.getContentResolver().openInputStream(uri);
FileOutputStream outputStream = new FileOutputStream(file);
int read = 0;
int maxBufferSize = 1 * 1024 * 1024;
int bytesAvailable = inputStream.available();
//int bufferSize = 1024;
int bufferSize = Math.min(bytesAvailable, maxBufferSize);
final byte[] buffers = new byte[bufferSize];
while ((read = inputStream.read(buffers)) != -1) {
outputStream.write(buffers, 0, read);
}
Log.e("File Size", "Size " + file.length());
inputStream.close();
outputStream.close();
Log.e("File Path", "Path " + file.getPath());
Log.e("File Size", "Size " + file.length());
} catch (Exception e) {
Log.e("Exception", e.getMessage());
}
return file.getPath();
}
I worked on Android application based on Cordova and I had to change the version the application was focused on to save files in the device.
I change the API Level version to 28 and works correctly. This change is used to avoid the scoped storage feature added on Android 10.
This information is extracted from this page:
https://developer.android.com/training/data-storage/use-cases#opt-out-scoped-storage
I hope this information is helpful.
First, check whether you have implemented scoped storage logic in-app.
You can also use android:requestLegacyExternalStorage="true"
But this legacyStoragePermission is limited to version 10.
You need to implement scoped logic.
Also, check whether your targetSDKVersion value is 30 or greater or not,
this is needed if you are using the app in Device android version 30 or more.
I spent a week getting the info on how to read files from External storage on Android 11 API 29 and Later.
You still need Manifest permission READ_EXTERNAL_STORAGE.
try {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
// Open a specific media item using ParcelFileDescriptor.
ContentResolver resolver = getApplicationContext()
.getContentResolver();
// "rw" for read-and-write;
// "rwt" for truncating or overwriting existing file contents.
String readOnlyMode = "r";
// uri - I have got from onActivityResult
//uri = data.getData();
ParcelFileDescriptor parcelFile = resolver.openFileDescriptor(uri, readOnlyMode);
FileReader fileReader = new FileReader(parcelFile.getFileDescriptor());
BufferedReader reader = new BufferedReader(fileReader);
String line;
while ((line = reader.readLine()) != null) {
//Your action here!!!
}
reader.close();
fileReader.close();
}
} catch (IOException e) {
e.printStackTrace();
}
Read this: Open a media file.
from android 10, it is not possible to access all the files through your app,
so while saving data for example image , use following code and then you can read it normally. getExternalFilesDir is important
File file=new File(getActivity().getApplicationContext().getExternalFilesDir(null),"/scantempo"+"/Image_" + System.currentTimeMillis() + ".jpg");
FileOutputStream out = new FileOutputStream(file);
bitmap.compress(Bitmap.CompressFormat.PNG, 90, out);
out.flush();
out.close();
Uri uri=Uri.fromFile(file);
return uri;
After you update your app to target Android 11, the system ignores the requestLegacyExternalStorage flag.
For read files from external storage following codes:
fun startFilePicker(activity: Activity, requestCode: Int) {
val pickIntent: Intent = Intent(Intent.ACTION_OPEN_DOCUMENT).apply {
addCategory(Intent.CATEGORY_OPENABLE)
addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION)
putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true)
type = "*/*"
}
activity.startActivityForResult(pickIntent, requestCode)
}
override fun onActivityResult(requestCode : Int , resultCode : Int , data : Intent?) {
super.onActivityResult(requestCode, resultCode, data)
val fileUri=data.data
val takeFlags: Int = Intent.FLAG_GRANT_READ_URI_PERMISSION or
Intent.FLAG_GRANT_WRITE_URI_PERMISSION
context.contentResolver.takePersistableUriPermission(
fileUri,
takeFlags
)
}
Create temp file
fun createTempFileForUpload(context:Context,fileUri:Uri){
val docFile = DocumentFile.fromSingleUri(context, fileUri)
val fileName: String = if (docFile == null || docFile.name.isNullOrBlank()) {
FilenameUtils.getName(fileUri.path)
} else {
docFile.name!!
}
val tempFile = File.createTempFile("tempFile", "tmp")
val ins: InputStream = context.contentResolver.openInputStream(fileUri)!!
val out: OutputStream = FileOutputStream(tempFile)
val buf = ByteArray(1024)
var len: Int = ins.read(buf)
while (len > 0) {
out.write(buf, 0, len)
len = ins.read(buf)
}
out.close()
ins.close()
tempFile.mkdirs()
}
Then you can upload temp file .
You can change allowBackup from true to false in Manifest's application part. It worked for me.
android:allowBackup="false"
I am trying to save a stream to a subfolder of storage/emulated/0, but am getting the error fail readDirectory() errno=20
I am using the below code :
BufferedInputStream bis = new BufferedInputStream(instream, buffersize);
BufferedOutputStream out = new BufferedOutputStream(
new FileOutputStream(fileName + ".download"),
buffersize);
int len;
int downloadedlen = 0;
byte[] buff = new byte[buffersize];
String firstfewchars = null;
while ((len = bis.read(buff)) > 0) {
Log.i(TAG, "Writing Data from Stream Line 814");
out.write(buff, 0, len);
}
Can anyone suggest what is wrong ?
Thanks.
Are you sure you have permissions, and folder is public?
For testing, You can try get directory in this way:
Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS)
Also, don't forget permissions in manifest:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
In my application, my requirement is need to install .APK file from assets folder, so that I am trying to copy the apk file from assets folder to sdcard, I get File Not Found Exception.
these the following code:
String file_path = Environment.getExternalStorageDirectory().getAbsolutePath();
String file_name = "ImageDownloading.apk";
AssetManager assetManager = getAssets();
try{
InputStream input = new BufferedInputStream(assetManager.open(file_name));
File path = new File(file_path);
if(!path.exists()){
path.mkdirs()
}
File file = new File(path,file_name);
OutputStream output = new FileOutputStream(file); // Here i get File Not Found Exception error.
byte data[] = new byte[1024];
int count;
while ((count = input.read(data)) != -1) {
output.write(data, 0, count);
}
output.flush();
output.close();
input.close();
}
catch(FileNotFoundException e){
Toast.makeText(MainActivity.this,"File not found exception " + e.getMessage(), Toast.LENGTH_SHORT).show();
}
I have spent a lot of time but i did not find out the solution.
Do you have this permission set in your manifest file?
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />