import static android.Manifest.permission.CHANGE_CONFIGURATION;
import static android.Manifest.permission.MODIFY_AUDIO_SETTINGS;
import static android.Manifest.permission.WRITE_EXTERNAL_STORAGE;
import static android.Manifest.permission.WRITE_SETTINGS;

if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            Permis();
        }

private void Permis() {

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            if ((checkSelfPermission(WRITE_EXTERNAL_STORAGE) ==  PackageManager.PERMISSION_GRANTED) &&
                    (checkSelfPermission(CHANGE_CONFIGURATION) ==  PackageManager.PERMISSION_GRANTED) &&
                    (checkSelfPermission(MODIFY_AUDIO_SETTINGS) ==  PackageManager.PERMISSION_GRANTED) &&
                    (checkSelfPermission(WRITE_SETTINGS) ==  PackageManager.PERMISSION_GRANTED)) {

                Toast.makeText(tuneActivity.this, "Permiso concedido  anteriormente", Toast.LENGTH_SHORT).show();

            }


if ((shouldShowRequestPermissionRationale(WRITE_EXTERNAL_STORAGE))||   (shouldShowRequestPermissionRationale(CHANGE_CONFIGURATION)) || (shouldShowRequestPermissionRationale(MODIFY_AUDIO_SETTINGS)) || (shouldShowRequestPermissionRationale(WRITE_SETTINGS))){

                DialogoAlerta();

            } else {
                requestPermissions(new String[]{WRITE_EXTERNAL_STORAGE,  CHANGE_CONFIGURATION, MODIFY_AUDIO_SETTINGS, WRITE_SETTINGS},
                        MY_PERMISSIONS_REQUEST);
            }


        }
    }

private void DialogoAlerta() {

        AlertDialog.Builder dialogo=new AlertDialog.Builder(tuneActivity.this);
        dialogo.setTitle("Permisos desactivados");
        dialogo.setMessage("Debe aceptar los permisos para poder definir un  tono como ringtone o sonido de notificacion");
        dialogo.setPositiveButton("Aceptar", new  DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialogInterface, int i) {

                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                    requestPermissions(new String[]{WRITE_EXTERNAL_STORAGE,  CHANGE_CONFIGURATION, MODIFY_AUDIO_SETTINGS, WRITE_SETTINGS},
                            MY_PERMISSIONS_REQUEST);
                }
            }

        });
    }

@Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String permissions[], @NonNull int[] grantResults) {
            `super.onRequestPermissionsResult(requestCode,permissions,grantResults);`
        switch (requestCode) {
            case MY_PERMISSIONS_REQUEST: {
                // If request is cancelled, the result arrays are empty.
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED && grantResults[1] == PackageManager.PERMISSION_GRANTED && grantResults[2] == PackageManager.PERMISSION_GRANTED && grantResults[3] == PackageManager.PERMISSION_GRANTED ) {

            Toast.makeText (tuneActivity.this,"Permiso concedido",Toast.LENGTH_SHORT).show();
        } else {
            Toast.makeText (tuneActivity.this,"Permiso no concedido",Toast.LENGTH_SHORT).show();
        }
        return;

    }
}
}