Displaying images from SDCard in a Widget from MarshMallow

Question

In a widget I display images from SDCard using remoteView.setImageViewUri(). This strategy works correctly except with MarshMallow:

The error is:

Unable to open content:  file:///storage/emulated/0/Android/data/applicaitonPackage/files/file.png
open failed: EACCESS (Permission denied)

It's clear that this is a permission problem, but I don't know how to give permissions to the widget container and in theory (see Note 1) the images are already stored in shared storage.

Note 1: The directory where images are stored is shared storage under Environment.getExternalStorageDirectory()

Note 2: Application is not adapted to MarshMallow and uses targetSdkVersion=15

Note 3: Don't just reply explaining about new runtime permissions in MarshMallow. I already know permissions changes and that is not the problem because application is targeted SDKVersion 15 and the app hasn't any problem accessing the external storage, the problem is with the widget container that is the one that I suspect that doesn't has the permissions.

Answer 1

hi here is few steps for setup permission for android M and remember you should declare same permission in manifest file as well.

Step 1. Declare global variable :

public static final int MY_PERMISSIONS_REQUEST_LOCATION = 0;

Step 2. Use this code in your main activity

private void locationpermission() {
// Here, thisActivity is the current activity
 if (ContextCompat.checkSelfPermission(activity
    ,
    Manifest.permission.ACCESS_COARSE_LOCATION)
    != PackageManager.PERMISSION_GRANTED) {

// Should we show an explanation?
if (ActivityCompat.shouldShowRequestPermissionRationale(activity,
        Manifest.permission.ACCESS_COARSE_LOCATION)) {

    // Show an expanation to the user *asynchronously* -- don't block
    // this thread waiting for the user's response! After the user
    // sees the explanation, try again to request the permission.

} else {

    // No explanation needed, we can request the permission.

    ActivityCompat.requestPermissions(activity,
            new String[]{Manifest.permission.ACCESS_COARSE_LOCATION},
            MY_PERMISSIONS_REQUEST_LOCATION);

    // MY_PERMISSIONS_REQUEST_READ_CONTACTS is an
    // app-defined int constant. The callback method gets the
    // result of the request.
}
}
 }

  @Override
  public void onRequestPermissionsResult(int requestCode,
                               String permissions[], int[] grantResults)         {
switch (requestCode) {
case MY_PERMISSIONS_REQUEST_LOCATION: {
    // If request is cancelled, the result arrays are empty.
    if (grantResults.length > 0
            && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

        // permission was granted, yay! Do the
        // contacts-related task you need to do.

    } else {

        // permission denied, boo! Disable the
        // functionality that depends on this permission.
    }
    return;
}

// other 'case' lines to check for other
// permissions this app might request
}
}

Step 3. Call this method in your oncreate method,

locationpermission(); And anyone permission you can call from here and every result you can get in override method onRequestPermissionsResult this one.

thankyou

hope this will help you (Y).

please refer from here example

https://www.dropbox.com/s/w29sljy0zpwwm61/MyApplication.zip?dl=0

Answer 2

@Docs says

Requesting Permissions at Run Time

Beginning in Android 6.0 (API level 23), users grant permissions to apps while the app is running, not when they install the app. This approach streamlines the app install process, since the user does not need to grant permissions when they install or update the app. It also gives the user more control over the app's functionality;

Therefore this make sense although you declare permission in manifest but still getting permission denied

I suggest you to read how to get runtime permission

http://developer.android.com/training/permissions/requesting.html

Here is the example provided by Docs

    if (ContextCompat.checkSelfPermission(thisActivity,
            Manifest.permission.READ_CONTACTS)
    != PackageManager.PERMISSION_GRANTED) {

// Should we show an explanation?
if (ActivityCompat.shouldShowRequestPermissionRationale(thisActivity,
        Manifest.permission.READ_CONTACTS)) {

    // Show an expanation to the user *asynchronously* -- don't block
    // this thread waiting for the user's response! After the user
    // sees the explanation, try again to request the permission.

} else {

    // No explanation needed, we can request the permission.

    ActivityCompat.requestPermissions(thisActivity,
            new String[]{Manifest.permission.READ_CONTACTS},
            MY_PERMISSIONS_REQUEST_READ_CONTACTS);

    // MY_PERMISSIONS_REQUEST_WRITE_EXTERNAL_STORAGE is an
    // app-defined int constant. The callback method gets the
    // result of the request.
}

}

Change permission as per you requirement

Hope it leads you to right direction