从Android中的单击通知中获取数据

大家好，我需要有关如何从使用广播接收器设置的未决意图中获取数据的帮助。我想发生的是单击通知时获取ID的数据，这对于我的活动是必需的。

这就是我做演员的方式

public class AlertReceiver extends BroadcastReceiver {

    private int id;
    // Called when a broadcast is made targeting this class
    @Override
    public void onReceive(Context context, Intent intent) {

        Bundle bundle = intent.getExtras();
        String title = bundle.getString("title");
        String time = bundle.getString("time");
        id = bundle.getInt("id");

        createNotification(context, title, time, "Pharoah Reminder");
    }

    public void createNotification(Context context, String msg, String msgText,  String msgAlert){
        Intent reminderActivity =  new Intent(context, ReminderPreviewActivity.class);
        reminderActivity.putExtra("id", id);

        PendingIntent notificationIntent = PendingIntent.getActivity(context, id,
                reminderActivity, PendingIntent.FLAG_UPDATE_CURRENT );

        NotificationCompat.Builder mBuilder = (NotificationCompat.Builder) new NotificationCompat.Builder(context)
                .setSmallIcon(R.mipmap.ic_launcher)
                .setContentTitle(msg)
                .setTicker(msgAlert)
                .setContentText(msgText)
                .setContentIntent(notificationIntent);

        mBuilder.setContentIntent(notificationIntent);
        mBuilder.setDefaults(NotificationCompat.DEFAULT_SOUND);
        mBuilder.setAutoCancel(true);

        NotificationManager mNotificationManager =
                (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);

        mNotificationManager.notify(id, mBuilder.build());
    }
}

但是当我尝试从通知中打开活动时，它始终为null。

这是我怎么得到的。

public class ReminderPreviewActivity extends AppCompatActivity {

    private Toolbar mToolBar;

    private TextView titleTextView;
    private TextView descTextView;
    private TextView timeTextView;
    private TextView dateTextView;

    private String title;
    private String desc;
    private String date;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_reminder_preview);

        mToolBar = (Toolbar) findViewById(R.id.app_bar);
        setSupportActionBar(mToolBar);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        getSupportActionBar().setDisplayShowHomeEnabled(true);



        titleTextView   = (TextView) findViewById(R.id.titleTextView);
        descTextView    = (TextView) findViewById(R.id.descTextView);
        timeTextView    = (TextView) findViewById(R.id.timeTextView);
        dateTextView    = (TextView) findViewById(R.id.dateTextView);

        Intent extras = getIntent();

        if(extras.getStringExtra("title") != null){
            setContentFromExtras(extras);
        }else{
            setContentFromDB(extras);
        }
    }

    private void setContentFromExtras(Intent extras){
        title   = extras.getStringExtra("title");
        desc    = extras.getStringExtra("desc");
        date    = extras.getStringExtra("date");

        String[] dateDB = date.split(" ");

        titleTextView.setText(title);
        descTextView.setText(desc);
        timeTextView.setText(formatTime(dateDB[1])+" "+dateDB[2]);
        dateTextView.setText(formatDate(dateDB[0]));
    }

    public void setContentFromDB(Intent extras){
        String id = extras.getStringExtra("id");

        int reminderID = Integer.parseInt(id);

        titleTextView.setText(reminderID);
    }

我需要ID才能从数据库中检索数据。当我关闭应用程序时，也会发生同样的事情。