Develop Reference

How to add App specific permissions to Android DocumentProvider

I want to create a file in AppA and then be able to access it from AppB only. I am able to create the file via the DocumentProvider and then access it via StorageClient see examples here. How do I setup the permission on the file in AppA so that only AppB can access it?
Method for file creation in AppA
String s = "kv;ab\nkv1;cd";
try {
byte[] buffer = s.getBytes();
String filename = "myfile.txt";
System.out.println("filename="+filename);
FileOutputStream fos = getContext().openFileOutput(filename, Context.MODE_PRIVATE);
fos.write(buffer);
fos.close();
System.out.println(s);
} catch (IOException e) {
e.printStackTrace();
}
}
Methods for File access in AppB
public void onClick(View view) {
Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
intent.setType("text/plain");
Uri pickerInitialUri= Uri.parse("content://com.example.android.storageprovider.documents/document/root%3Amyfile.txt");
intent.putExtra(DocumentsContract.EXTRA_INITIAL_URI, pickerInitialUri);
startActivityForResult(intent, READ_REQUEST_CODE);
}
#Override
public void onActivityResult(int requestCode, int resultCode, Intent resultData) {
super.onActivityResult(requestCode, resultCode, resultData);
readFileExternalStorage();
}
public String readFileExternalStorage() {
String s = "";
Uri uri1 = Uri.parse("content://com.example.android.storageprovider.documents/document/root%3Amyfile.txt");
try {
InputStream ins = this.getBaseContext().getContentResolver().openInputStream(uri1);
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
int size;
byte[] buffer = new byte[1024];
while ((size = ins.read(buffer, 0, 1024)) >= 0) {
outputStream.write(buffer, 0, size);
}
ins.close();
buffer = outputStream.toByteArray();
s = new String(buffer);
System.out.println("output=" + s);
} catch (FileNotFoundException e) {
System.out.println("An error occurred.");
e.printStackTrace();
} catch (IOException e) {
System.out.println("An error occurred.");
e.printStackTrace();
}
TextView textview = findViewById(R.id.textView);
textview.setText(s);
return "ok\n" + s;
}

Two probable options-
https://developer.android.com/guide/topics/permissions/defining
Use a shared encryption key with user based salt to encrypt and decrypt stored files on Android

file picker throwing ENOENT no such file or directory

i am trying to pick an audio file and save it , but i am getting ENOENT , yet i use the same code with image and it works fine !!!!! \n
i am using file provider to create/save files and it works more than probably .
how can the same code work with images yet not with audio : \n
here is some code examples \n
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(requestCode == 0 && resultCode == RESULT_OK) {
Uri resultUri = data.getData();
saveFile(resultUri);
}
}
and to save the file i use :
File dirPath = new File(Environment.getExternalStorageDirectory(),"Moch/WAR/");
File file = new File(dirPath, "notification.mp3");
String sourceFilename = resultUri.getPath();
BufferedInputStream bis = null;
BufferedOutputStream bos = null;
try {
if(!file.exists())
if (!file.createNewFile())
Toast.makeText(notificationsSettings.this,"Unable to make sound File",Toast.LENGTH_LONG).show();
if(file.exists()) {
bis = new BufferedInputStream(new FileInputStream(sourceFilename));
bos = new BufferedOutputStream(new FileOutputStream(file, false));
byte[] buf = new byte[1024];
bis.read(buf);
do {
bos.write(buf);
} while (bis.read(buf) != -1);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (bis != null) bis.close();
if (bos != null) bos.close();
mProgressDialog.dismiss();
} catch (IOException e) {
e.printStackTrace();
}
}
}
and this is the doomed error line : \n
/document/audio:266: open failed: ENOENT (No such file or directory)

how to copy directory (folder) to usb storage

i am trying to copy whole directory to usb storage :
File Sdfile = new File(Environment.getExternalStorageDirectory(), "myfolder");
Intent intent = new Intent(Intent.ACTION_CREATE_DOCUMENT);
intent.setType("*/*");
intent.setType(DocumentsContract.Document.MIME_TYPE_DIR);//For API 19+
intent.putExtra(Intent.EXTRA_TITLE, Sdfile.getName());
intent.putExtra("android.content.extra.SHOW_ADVANCED", true);
startActivityForResult(intent, 47);
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == 47) {
if (resultCode != RESULT_OK) return;
File file = new File(Environment.getExternalStorageDirectory(), "myfolder");
copyFile(file, data.getData());
}
Below code is for copy the whole folder to usb storage.
private void copyFile(File src, Uri destUri) {
BufferedInputStream bis = null;
BufferedOutputStream bos = null;
try {
bis = new BufferedInputStream(new FileInputStream(src));
bos = new BufferedOutputStream(getContentResolver().openOutputStream(destUri));
byte[] buf = new byte[5024];
bis.read(buf);
do {
bos.write(buf);
} while (bis.read(buf) != -1);
} catch (NullPointerException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (bis != null) bis.close();
if (bos != null) bos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
when i am trying to copy the whole folder then it gives error.
Even i direct copy the whole folder to usb storage .
How can i copy whole directory ?

I'm guessing your app does not have the correct permissions. For Android versions below KitKat, you need to declare the permission WRITE_EXTERNAL_STORAGE in your AndroidManifest.xml
<user-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
Reference: http://developer.android.com/reference/android/Manifest.permission.html#WRITE_EXTERNAL_STORAGE

Android WallpaperManager: start intent to crop and resize picture - problems with Uri

I am trying to use getCropAndSetWallpaperIntent method of WallpaperManager class, but face problems with uri it need. First I tried to get Uri from drawable resourse, but I concluded that this is impossible, and decided to write file to internal storage and get its Uri. Now it gives an error, that uri type must be content. How can I fix this error? Maybe writing file to memory is totally wrong and there are other solutions?
Here is my code:
public void onclick(View v){
switch (v.getId())
{
case R.id.set:
// try{
//R.drawable.file1
File file =new File(this.getFilesDir(),getResources().getResourceName(R.drawable.file1));
file.setWritable(true);
if (!file.exists())
{
Bitmap bm= BitmapFactory.decodeResource(getResources(),R.drawable.file1);
try {
FileOutputStream outputStream=new FileOutputStream(file);
bm.compress(Bitmap.CompressFormat.JPEG,100,outputStream);
outputStream.flush();
outputStream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
Uri uri=Uri.fromFile(file);
Intent i=wmanager.getCropAndSetWallpaperIntent(uri);
startActivity(i);
break;
case R.id.clear:
try{
wmanager.clear();
}
catch (IOException ioex){
ioex.printStackTrace();
}
}
}

I have seen the same problem, fixed by following method and works fine.
#TargetApi(Build.VERSION_CODES.KITKAT) private void setWallpaperKitkat(File file) {
Uri uri = Uri.fromFile(file);
Intent intent = new Intent(WallpaperManager.ACTION_CROP_AND_SET_WALLPAPER);
String mime = "image/*";
intent.setDataAndType(uri, mime);
try {
startActivity(intent);
} catch (ActivityNotFoundException e) {
//handle error
}
}

can't see the file in parse data browser

I'm trying to implement a simple file upload and associate the file with the current user.
I followed the guide on parse.com and checked with several questions on here with no luck.
The saveinBackground operation is successful, no exceptions are being thrown but I can't see the file in Parse.com data browser.
Here's my code.
final long time1 = Time;
//Image part
//upload the .jpg file for user's history
//Parse
byte[] data = filePath.getBytes();
final ParseFile file = new ParseFile("asdasd.jpg", data);
file.saveInBackground(new SaveCallback() {
public void done(ParseException e) {
// Handle success or failure here ...
if ( e == null){
ParseObject rentedTime = new ParseObject("Time");
rentedTime.put("duration", renttime1);
rentedTime.put("owner", ParseUser.getCurrentUser());
rentedTime.put("id", id);
rentedTime.put("image", file);
rentedTime.saveInBackground(new SaveCallback() {
#Override
public void done(ParseException e) {
if (e == null)
Log.d("upload successful" + file.getName(), null);
}
});
} else {
Log.d("terrible", e.getMessage());
}
}
}, new ProgressCallback() {
public void done(Integer percentDone) {
// Update your progress spinner here. percentDone will be between 0 and 100.
}
});
}
What am I missing?

That's because you are NOT uploading the file..see
byte[] data = filePath.getBytes();
just getting the bytes from the file path wont work reasonably.
First get the bitmap and then convert it to byte[] see how..
Bitmap bitmap = BitmapFactory.decodeFile(filePath);
byte[] data = getBytes(bitmap);
private byte[] getBytes(Bitmap bitmap) {
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 100, outputStream);
byte[] data = outputStream.toByteArray();
try {
outputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
return data;
}
And you can now use the data..
final ParseFile file = new ParseFile("asdasd.png", data);
I've changed the file name to .png format if you wish ti save in jpg format then compress in .JPG format as well.
Hope you find this helpful! :)