Read and Write external storage permission isn't working

Question

In my app i want to get user permission to read and write data on external storage, i have put permission tag in my manifest as below. But when installing app or running and whe

Answer 1

Read and Write permission for storage and gallery usage for marshmallow or above:

  private void requestPermission() {
      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
          requestPermissions(new String[] {
              android.Manifest.permission.WRITE_EXTERNAL_STORAGE}, REQUEST_WRITE_PERMISSION);
       } else {
           openFilePicker();
       }
  }

To check permission result use below method:

 @Override
 public void onRequestPermissionsResult(int requestCode, @NonNull String[] 
                                        permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);

    switch (requestCode) {
        case STORAGE_PERMISSION_REQUEST_CODE:
            if (grantResults.length > 0 && permissions[0].equals(Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
                // check whether storage permission granted or not.
                if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    // do what you want;
                }
            }
            break;
        default:
            break;
    }
}