通过向广播接收器发送唯一标识来取消多次通知

// 发送通知
private void sendNotification() {
    int notificationId = 1; // 唯一标识符

    // 创建通知
    NotificationCompat.Builder builder = new NotificationCompat.Builder(this)
            .setSmallIcon(R.drawable.notification_icon)
            .setContentTitle("通知标题")
            .setContentText("通知内容")
            .setAutoCancel(true);

    // 将唯一标识符附加到Intent中
    Intent intent = new Intent(this, MyBroadcastReceiver.class);
    intent.putExtra("notificationId", notificationId);
    PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);

    // 设置通知点击事件
    builder.setContentIntent(pendingIntent);

    // 发送通知
    NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    notificationManager.notify(notificationId, builder.build());
}

// 取消通知
private void cancelNotification(int notificationId) {
    Intent intent = new Intent(this, MyBroadcastReceiver.class);
    intent.putExtra("notificationId", notificationId);
    PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);

    AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
    alarmManager.cancel(pendingIntent);
}