Android：在某个日期前7天向用户发送通知。

Question

我想创建一个应用程序，在指定日期前7天发送一个android通知。现在，我正在阅读正确的日期并正确设置日历，但由于某种原因，警报未触发。此外，当我执行adb shell dumpsys alarm以查看是否设置了警报时，转储不会显示与我的应用程序相关的任何警报。我现在创建AlarmManager和通知的代码是

calendar.set(year, month, day, hour, min); 
calendar.add(Calendar.DAY_OF_MONTH, -7); 
AlarmManager alarmManager = (AlarmManager) context.getSystemService(ALARM_SERVICE); 
Intent intent = new Intent("android.media.action.DISPLAY_NOTIFICATION"); 
PendingIntent broadcast = PendingIntent.getBroadcast(context, 100, intent, PendingIntent.FLAG_UPDATE_CURRENT); 
alarmManager.setExact(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), broadcast); 

这有什么问题？这不是设置闹钟的正确方法吗？我有这个想法从here

Answer 1

我做以下几点： 使用getNotification()和你calandar.getTime()作为参数scheduleNotification

private void scheduleNotification(Notification notification, Date alarmTime) { 

    Intent notificationIntent = new Intent(this, NotificationReceiver.class); 
    notificationIntent.putExtra(NotificationReceiver.NOTIFICATION_ID, 1); 
    notificationIntent.putExtra(NotificationReceiver.NOTIFICATION, notification); 
    PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, notificationIntent, PendingIntent.FLAG_UPDATE_CURRENT); 

    AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE); 
    alarmManager.set(AlarmManager.RTC_WAKEUP, alarmTime.getTime(), pendingIntent); 
} 

private Notification getNotification() { 
    int colour = getNotificationColour(); 
    Bitmap largeNotificationImage = getLargeNotificationImage(); 
    return new RandomNotification(this).getNotification(
      "Text", 
      "More text", 
      getNotificationImage(), 
      largeNotificationImage, 
      colour); 
} 

private int getNotificationColour() { 
    return ContextCompat.getColor(this, R.color.colorAccent); 
} 

private Bitmap getLargeNotificationImage() { 
    return BitmapFactory.decodeResource(this.getResources(), 
      R.mipmap.ic_launcher); 
} 

我RandomNotification类：

public class RandomNotification { 

    private Context context; 

    public RandomNotification(Context context) { 
     this.context = context; 
    } 

    public Notification getNotification(String title, String message, int imageResourceId, Bitmap largeResource, int colour) { 

     Uri soundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION); 
     Notification.Builder builder = new Notification.Builder(context) 
       .setContentTitle(title) 
       .setContentText(message) 
       .setSmallIcon(imageResourceId) 
       .setLargeIcon(largeResource) 
       .setTicker("Ticker") 
       .addAction(0, "Button", getButtonIntent()) 
       .setSound(soundUri) 
       .setLights(Color.BLUE, 300, 100) 
       .setAutoCancel(true) 
       .setPriority(Notification.PRIORITY_MAX) 
       .setContentIntent(getPendingNotificationIntent()); 

     handleNotificationColor(builder, colour); 

     Notification notification = builder.build(); 
     notification.flags = Notification.FLAG_AUTO_CANCEL | Notification.FLAG_SHOW_LIGHTS; 
     return notification; 
    } 

    private Notification.Builder handleNotificationColor(Notification.Builder builder, int colour) { 
     if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { 
      builder.setColor(colour); 
     } 
     return builder; 
    } 

    private PendingIntent getPendingNotificationIntent() { 
     Intent notificationIntent = new Intent(context, HomeActivity.class); 
     notificationIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP 
       | Intent.FLAG_ACTIVITY_SINGLE_TOP); 
     PendingIntent pendingNotificationIntent = PendingIntent.getActivity(context, 1, 
       notificationIntent, PendingIntent.FLAG_UPDATE_CURRENT); 
     return pendingNotificationIntent; 
    } 

    private PendingIntent getButtonIntent() { 
     Intent notificationButtonReceiver = new Intent(context, NotificationButtonReceiver.class); 
     PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, notificationButtonReceiver, PendingIntent.FLAG_CANCEL_CURRENT); 
     return pendingIntent; 
    } 

} 

我的通知按钮的接收机类：

public class NotificationButtonReceiver extends BroadcastReceiver { 



    private Context context; 

    @Override 
    public void onReceive(Context context, Intent intent) { 
     this.context = context; 
     // do something 

    } 


} 

我的更新通知接收器类

public class NotificationReceiver extends BroadcastReceiver { 

    public static String NOTIFICATION_ID = "notification-id"; 

    public static String NOTIFICATION = "notification"; 

    @Override 
    public void onReceive(Context context, Intent intent) { 
     NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE); 

     Notification notification = intent.getParcelableExtra(NOTIFICATION); 
     int id = intent.getIntExtra(NOTIFICATION_ID, 0); 
     notificationManager.notify(id, notification); 
    } 
} 

我的清单文件：

<receiver 
    android:name=".NotificationButtonReceiver" 
    android:exported="true"> 
    <intent-filter> 
     <action android:name="android.intent.action.NOTIFY" /> 
    </intent-filter> 
</receiver> 
    <receiver 
     android:name=".NotificationReceiver" 
     android:exported="true"> 
     <intent-filter> 
      <action android:name="android.intent.action.NOTIFY" /> 
     </intent-filter> 
    </receiver>