<activity
        android:name=".ui.backup.BackupActivity"
        android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize"
        android:theme="@style/LibraryTheme">
        <action android:name="com.x.y.HANDLE_AUTHORIZATION_RESPONSE"/>
        <category android:name="android.intent.category.DEFAULT"/>
    </activity>

    <activity android:name="net.openid.appauth.RedirectUriReceiverActivity">
        <intent-filter>
            <action android:name="android.intent.action.VIEW"/>

            <category android:name="android.intent.category.DEFAULT"/>
            <category android:name="android.intent.category.BROWSABLE"/>

            <data android:scheme="com.x.y"/>
        </intent-filter>
    </activity>

private void setupAuthorization() {
    AuthorizationServiceConfiguration serviceConfiguration = new AuthorizationServiceConfiguration(
            Uri.parse("https://accounts.google.com/o/oauth2/v2/auth") /* auth endpoint */,
            Uri.parse("https://accounts.google.com/o/oauth2/token") /* token endpoint */
    );

    String clientId = "xxx.apps.googleusercontent.com";
    Uri redirectUri = Uri.parse("com.x.y:/oauth2callback");
    AuthorizationRequest.Builder builder = new AuthorizationRequest.Builder(
            serviceConfiguration,
            clientId,
            AuthorizationRequest.RESPONSE_TYPE_CODE,
            redirectUri
    );
    builder.setScopes("https://www.googleapis.com/auth/drive");
    AuthorizationRequest request = builder.build();
    AuthorizationService authorizationService = new AuthorizationService(this);

    String action = "com.x.y.HANDLE_AUTHORIZATION_RESPONSE";
    Intent postAuthorizationIntent = new Intent(action);
    PendingIntent pendingIntent = PendingIntent.getActivity(this, request.hashCode(), postAuthorizationIntent, 0);
        authorizationService.performAuthorizationRequest(request, pendingIntent);
}