如何在每48小时后显示android通知？

Question

我尝试了以下代码为Android通知,这是正常工作,但它是在我启动我的Android应用程序时给我通知弹出窗口.

我希望每48小时后显示一次通知,我该怎么办？

为了实现这一点,我需要做出哪些改变？

通知代码

 Intent notificationIntent = new Intent(MainActivity.this, Activity.class);
        PendingIntent contentIntent = PendingIntent.getActivity(MainActivity.this, 0, notificationIntent, 0);

         NotificationManager notificationManager = (NotificationManager) MainActivity.this
                    .getSystemService(Context.NOTIFICATION_SERVICE);

         Notification noti = new NotificationCompat.Builder(MainActivity.this)
                            .setSmallIcon(R.drawable.ic_launcher)
                            .setTicker("ticker message")

                            .setWhen(System.currentTimeMillis())
                            .setContentTitle("HELLO")
                            .setContentText("PLEASE CHECK WE HAVE UPDATED NEWS")
                            .setContentIntent(contentIntent)
                            //At most three action buttons can be added
                            .setAutoCancel(true).build();
        int notifyID =0;
        notificationManager.notify(notifyID, noti);

Answer 1

这是您在主要活动中所需要的东西:

    Intent notificationIntent = new Intent(context, ShowNotification.class);
    PendingIntent contentIntent = PendingIntent.getService(context, 0, notificationIntent,
                                                           PendingIntent.FLAG_CANCEL_CURRENT);

    AlarmManager am = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
    am.cancel(contentIntent);
    am.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis()
            + AlarmManager.INTERVAL_DAY * 2, AlarmManager.INTERVAL_DAY * 2, contentIntent);

然后,在另一个名为ShowNotification.java的文件中,添加以下内容(假设您的主要活动名为MainActivity):

import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.os.IBinder;
import android.support.v4.app.NotificationCompat;
import android.util.Log;

public class ShowNotification extends Service {

    private final static String TAG = "ShowNotification";

    @Override
    public void onCreate() {
        super.onCreate();

        Intent mainIntent = new Intent(this, MainActivity.class);

        NotificationManager notificationManager
            = (NotificationManager) this.getSystemService(Context.NOTIFICATION_SERVICE);

        Notification noti = new NotificationCompat.Builder(this)
            .setAutoCancel(true)
            .setContentIntent(PendingIntent.getActivity(this, 0, mainIntent,
                              PendingIntent.FLAG_UPDATE_CURRENT))
            .setContentTitle("HELLO " + System.currentTimeMillis())
            .setContentText("PLEASE CHECK WE HAVE UPDATED NEWS")
            .setDefaults(Notification.DEFAULT_ALL)
            .setSmallIcon(R.drawable.ic_launcher)
            .setTicker("ticker message")
            .setWhen(System.currentTimeMillis())
            .build();

        notificationManager.notify(0, noti);

        Log.i(TAG, "Notification created");
    }

    @Override
    public IBinder onBind(Intent intent) {
        // TODO Auto-generated method stub
        return null;
    }
}