Android app can't read external storage files

Question

I\'m creating an app for a private use only... it\'s not so important then, respect your time :P

What I want to make is an app that reads from a database and plays s

Answer 1

if your targetSdk is 23 than you have to check permissions like this for marshmallow and above devices

if (Build.VERSION.SDK_INT == Build.VERSION_CODES.M) {
    checkPermission();
}
else {
}


private void checkPermission() {
        if (ContextCompat.checkSelfPermission(this,
                Manifest.permission.WRITE_EXTERNAL_STORAGE)
                != PackageManager.PERMISSION_GRANTED && ContextCompat.checkSelfPermission(this,
            Manifest.permission.READ_EXTERNAL_STORAGE)
            != PackageManager.PERMISSION_GRANTED) {//Can add more as per requirement

            ActivityCompat.requestPermissions(this,
                    new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE,Manifest.permission.READ_EXTERNAL_STORAGE},
                    123);

        } else {

        }
}

@Override
public void onRequestPermissionsResult(int requestCode,
                                   String permissions[], int[] grantResults)   
   {
    switch (requestCode) {
        case 123: {


 if (grantResults.length > 0
                    && grantResults[0] == PackageManager.PERMISSION_GRANTED)     {
   //Peform your task here if any
    } else {

        checkPermission();
    }
        return;
    }
}
}