How to show AlertDialog as permission rationale

Question

I have two activities: a Main, as well a RuntimePermissionManager, which is started first whenever my app is opened.

The app works as expected when the user allows the runtime permission, but when they deny it, instead of the AlertDialog showing up with the permission rationale, the permission dialog is closed completely, and I just get an infinite splash screen (since I have set it to always be on screen during the lifetime of its parent activity).

I have copied the permission logic straight from the RuntimePermissionsBasic example bundled with Android Studio, and just replaced the Snackbar with an AlertDialog, so I don’t see why my app isn’t working.

Here’s the complete RuntimePermissionManager activity for reference.

Thanks.

public class RuntimePermissionManager extends AppCompatActivity implements ActivityCompat.OnRequestPermissionsResultCallback {
    private static final String TAG = "RuntimePermissionManager";
    private static final String PERMISSION = Manifest.permission.WRITE_EXTERNAL_STORAGE;
    private static final int PERMISSION_ID = 0;

    @Override
    protected void onCreate(final Bundle savedInstanceState) {
        final SplashScreen splashScreen = SplashScreen.installSplashScreen(this);
        super.onCreate(savedInstanceState);
        // This ensures no hiccups while the splash screen is active.
        splashScreen.setKeepOnScreenCondition(() -> true);
        checkRuntimePermissionStatus();
        ThreadManager.unpackCriticalAssets(getApplicationContext());
    }

    @Override
    public void onRequestPermissionsResult(final int requestCode, @NonNull final String[] permissions, @NonNull final int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == PERMISSION_ID) {
            if (grantResults.length == 1 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                Log.i(TAG, "Runtime permission has been granted.");
                startMainActivity();
            } else {
                Log.e(TAG, "Runtime permission has been denied.");
            }
        }
    }

    private void checkRuntimePermissionStatus() {
        if (ActivityCompat.checkSelfPermission(this, PERMISSION) == PackageManager.PERMISSION_GRANTED) {
            Log.i(TAG, "Runtime permission has been granted.");
            startMainActivity();
        } else {
            requestRuntimePermission();
        }
    }

    private void requestRuntimePermission() {
        System.out.println(ActivityCompat.shouldShowRequestPermissionRationale(this, PERMISSION));
        if (ActivityCompat.shouldShowRequestPermissionRationale(this, PERMISSION)) {
            System.out.println("HERE1");
            showPermissionRationaleDialog(R.string.permission_rationale_title, R.string.permission_rationale_message);
        } else {
            Log.e(TAG, "Runtime permission has been denied.");
            ActivityCompat.requestPermissions(this, new String[]{PERMISSION}, PERMISSION_ID);
        }
    }

    private void showPermissionRationaleDialog(final int title, final int message) {
        System.out.println("HERE2");
        AlertDialog.Builder builder = new AlertDialog.Builder(RuntimePermissionManager.this);
        builder.setTitle(title).setMessage(message).setPositiveButton("OK", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                ActivityCompat.requestPermissions(RuntimePermissionManager.this, new String[]{PERMISSION}, PERMISSION_ID);
            }
        });
        builder.create().show();
    }

    private void startMainActivity() {
        Intent intent = new Intent(this, Main.class);
        startActivity(intent);
    }
}