如何从广播接收器启动片段？

Question

如何在Parse Broadcast Receiver的活动中启动我的特定片段？例如，当用户收到通知时，我希望它们立即打开活动A的片段B.这可能吗？我觉得我应该能够使用intent extra ...在onCreate方法中强制从活动A更改片段...

public class Receiver extends ParsePushBroadcastReceiver {

    @Override
    protected Bitmap getLargeIcon(Context context, Intent intent) {
        return BitmapFactory.decodeResource(context.getResources(), R.drawable.ic_launcher);
    }

    @Override
    protected void onPushOpen(Context context, Intent intent) {

        ParseAnalytics.trackAppOpenedInBackground(intent);

        String uriString = null;
        try {
            JSONObject pushData = new JSONObject(intent.getStringExtra("com.parse.Data"));
            uriString = pushData.optString("uri");
        } catch (JSONException e) {
            Log.v(getClass().toString(), "Unexpected JSONException when receiving push data: ", e);
        }
        Class<? extends Activity> cls = getActivity(context, intent);
        Intent activityIntent;
        if (uriString != null && !uriString.isEmpty()) {
            activityIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(uriString));
        } else {
            activityIntent = new Intent(context, MainActivity.class);
            activityIntent.putExtra("fragment", "fragment2");
            activityIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            context.startActivity(activityIntent);
        }
        activityIntent.putExtras(intent.getExtras());
        if (Build.VERSION.SDK_INT >= 16) {
            TaskStackBuilder stackBuilder = TaskStackBuilder.create(context);
            stackBuilder.addParentStack(cls);
            stackBuilder.addNextIntent(activityIntent);
            stackBuilder.startActivities();
        } else {
            activityIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            activityIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
            context.startActivity(activityIntent);
        }

    }
}

MainActivity（活动A）

在我的onCreate中，我提出以下内容：

Bundle bundle = getIntent().getExtras();
        if (bundle != null) {
            if (bundle.getString("fragment") != null) {
                /*Log.w(getClass().toString(), bundle.getString("fragment"));*/
                viewPager.setCurrentItem(1);
            }
        }

不幸的是，它并没有自动转移到片段B。