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Saving a JSON file to internal storage - Android

I've been trying to save a JSON (currently, it's simply a generic file) to my device's internal storage. I've looked at tons of examples that look exactly like what I've written, but I can never find the file on my device.
Code to save file
public void saveJSONStringToFile(String json) {
FileOutputStream outfile = null;
String filename = "json_test.json";
try {
outfile = openFileOutput(filename, this.MODE_PRIVATE);
outfile.write(json.getBytes());
outfile.close();
} catch (Exception e) {
e.printStackTrace();
}
}
I know that it's not working because I've also implemented code to retrieve that file and the app just hangs when I try that, implying that it's looking for something that isn't there.

open failed: EACCES (Permission denied) Reading PNG Even Though I Have Permission

In my app I am adding a Share button through the ShareActionProvider class. I am trying to share a PNG which I pull from the file system. The problem is I get the following error thrown at me when I try to share it with the stock messaging app
com.google.android.mms.MmsException: /data/data/com.frostbytedev.wifiqr/files/QRCode.png: open failed: EACCES (Permission denied)
At first I thought it was my permissions but I have the following permissions in my Manifest.
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
The place where I try to get it from the file system is here:
Uri uri = Uri.fromFile(new File(getFilesDir(), "/QRCode.png"));
Intent intent = new Intent(Intent.ACTION_SEND);
intent.setType("image/*");
intent.putExtra(Intent.EXTRA_STREAM,uri);
provider.setShareIntent(intent);
If you were wondering, he is the code where I save the image
String fileName = getFilesDir() + "/QRCode.png";
etSSID.setText(fileName);
OutputStream stream = null;
try {
stream = new FileOutputStream(fileName);
bmp.compress(Bitmap.CompressFormat.PNG, 80, stream);
stream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
How can I solve this issue?

if /data/data/com.frostbytedev.wifiqr is your app's private directory then yes, your app has permission to read that file. You don't even need the WRITE_EXTERNAL_STORAGE permission because it's "your" directory.
But once you share it with another app, that app needs permission to read the file as well. And that's per default not the case with files inside your app private directory. The error you get is from the MMS app having no access.
A simple way to fix the problem is to save the file to a place that can be read by every app. Essentially everything in Environment.getExternalStorageDirectory().
The next possibility is to make that file readable for other apps but keep it where you have it. File#setReadable(true, false) should do that.
Context also has nice methods to simplify creating files in readable mode.
String fileName = getFileStreamPath("QRCode.png").getPath();
etSSID.setText(fileName);
OutputStream stream = null;
try {
stream = openFileOutput("QRCode.png", Context.MODE_WORLD_READABLE);
bmp.compress(Bitmap.CompressFormat.PNG, 80, stream);
stream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
...
Uri uri = Uri.fromFile(getFileStreamPath("QRCode.png"));
.. share

Android share Intent share image doesn't exist

I'm trying to share an image file which saved to internal storage using share intent.
after I intent image file doesn't display.
I used following code to save the image file
try {
FileOutputStream fos = openFileOutput("twitterimage.jpg", Context.MODE_PRIVATE);
// Writing the bitmap to the output stream
bikeBm.compress(Bitmap.CompressFormat.JPEG, 100, fos);
fos.close();
} catch (Exception e) {
Log.e("saveToInternalStorage()", e.getMessage());
}
//intent code
File internalFile = getFileStreamPath("twitterimage.jpg");
Uri uri = Uri.fromFile(internalFile);
Intent shareIntent = new Intent();
shareIntent.setAction(Intent.ACTION_SEND);
shareIntent.putExtra(Intent.EXTRA_STREAM,new File(uri));
shareIntent.setType("image/jpeg");
shareIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
startActivity(Intent.createChooser(shareIntent, "send"));
when I check the file existance using above "uri", the image file exists
in the internal storage but checking the file using
String file = "data/data/com.bike.app/twitterimage.jpg";
File f = new File(file);
shows me the file not exist.
pls help me to solve this problem.

If i am gessing right you want to share images between to applications. Your probleme is that you used Context.MODE_PRIVATE when you write a file so other applications cannot have access to this file.
To share an image you can use MediaProvider to restrict access to you Media or simply used Context.MODE_WORLD_READABLE but the file will be public readable then.
hope that help

Saving an ImageView to Gallery - Code isn't working

This is my first question here. I've searched for my doubt. I found similar questions but i haven't exactly got my answer. So please forgive me if i have done something wrong.
I'm trying to save an image from an ImageView in my app to a folder in my sdcard. Here's the code :-
public void save(View view) {
myImage.setDrawingCacheEnabled(true);
Bitmap imgV = myImage.getDrawingCache();
String root = Environment.getExternalStorageDirectory().toString();
File myDir = new File(root + "/AVP_saved");
String fname="Image.png";
File file = new File(myDir, fname);
try {
FileOutputStream out = new FileOutputStream(file);
imgV.compress(Bitmap.CompressFormat.PNG, 90, out);
out.flush();
out.close();
Toast.makeText(this, "Image Downloaded", 7000).show();
} catch (Exception e) {
e.printStackTrace();
Toast.makeText(this, e.getMessage(), 8000).show();
}
}
'save' method is the method assigned to a button. 'myImage' is the ImageView found by its id. I have already set the permissions in the manifest. The thing is, the image dosen't get saved and it says that the path dosen't exist. When I myself create the folder "AVP_saved", then the image gets saved. What do i have to edit in this code such that the app creates the folder by itself when i click the button?
Thanks for your time!

Add this code after File myDir = new File(root + "/AVP_saved");
if(!myDir.exists()) {
mydir.mkdir(); //you can else call mkdirs() if you have to create a complete directory hierarchy
}
It seems that in Java, it's not possible to create a directory hierarchy by creating just a file in it.
With this, you'll create your directory only if it doesn't exist (be careful, if the directory exists but it's a file, it will launch an exception maybe, so you can look for myDir.isDirectory() too).

How to open .gif file as InputStream from external storage on android

I am trying to load .gif image from external storage (pictures directory) but I am getting 'file not found exception' using the following code.
InputStream mInputStream = null;
AssetManager assetManager = getResources().getAssets();
try {
mInputStream = assetManager.open(getExternalFilesDir(Environment.DIRECTORY_PICTURES).getAbsolutePath().concat("/01.gif"));
} catch (IOException e) {
e.printStackTrace();
}
I have also tested using manually path but got same exception
mInputStream = assetManager.open("file:///mnt/sdcard/Android/data/com.shurjo.downloader/files/Pictures/01.gif");
There is a write/read permission from the SD card in menifest file
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
Please help me how can I open a file as InputStream from external storage. Thanks in advance.
Note: I have tested it on emulator and there is a file 01.gif under Pictures folder (please see manual path). I can create directories and put files in those directories but can not able to access those files though Input Stream.

AssetManager is for accessing the files in the assets folder of the application package. It cannot be used to access files in the external storage.
You can use the following:
final String TAG = "MyAppTag";
File picturesDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES);
File imageFile = null;
final int readLimit = 16 * 1024;
if(picturesDir != null){
imageFile = new File(picturesDir, "01.gif");
} else {
Log.w(TAG, "DIRECTORY_PICTURES is not available!");
}
if(imageFile != null){
mInputStream = new BufferedInputStream(new FileInputStream(imageFile), readLimit);
mInputStream.mark(readLimit);
} else {
Log.w(TAG, "GIF image is not available!");
}
Please also take a look at the sample code available in getExternalFilesDir
Update from : this