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

From android 24 and above you need runtime permission to access some feature of device like Microphone and camera, storage etc. check you have storage permission access using below code

  private boolean hasStoragePermission(int requestCode) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        if (checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
            requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, requestCode);
            return false;
        } else {
            return true;
        }
    } else {
        return true;
    }
}

It show popup to allow for access, if its allow perform your action

 @Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    if (grantResults.length > 0
            && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
        if (requestCode == FILE_ATTACHMENT)
            attachFile();

    }
}