Android Custom-Time 通知 Service/Broadcast/AlarmManager

Android Custom-Time Notification Service/Broadcast/AlarmManager

我的目标是实现在一天中的 user-chosen 时间出现的通知。 我已经尝试过 Service,这可行,但问题是它需要大量后台进程(代码在下面),另一个是 AlarmManager 但这似乎无法正常工作,尤其是 API 19+。我在 Whosebug 上找不到 up-to-date well-coded 教程或​​类似问题的有用答案,所以我求助于您。

你们都知道:如果朋友向您发送 Whatsapp 短信,即使您的 phone 已关闭或处于睡眠状态(屏幕关闭),您也会收到通知。 我相信你们中的一些人已经实现了类似的东西。

任务准确: 我的应用程序应每天一次通知用户他在日历中安排的活动。

例如: 他选择了 13:00(我一直使用 24 小时格式)来提醒他他的事件。 他在第二天安排了 2 场活动: - 开车送孩子上学 - 去健身房

第二天在 13:00,应用程序显示一条通知: "You have two events for today!: 1)... 2)..."

用信息填充通知不是问题。这很好用,我测试了很多。 我只缺少 well-coded background-thread 正在等待 user-chosen 显示通知的时间。

请注意

Manifest.xml:

<?xml version="1.0" encoding="utf-8"?>
<manifest ... >
    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
    <uses-permission android:name="android.permission.WAKE_LOCK" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <service android:name=".services.NotificationService" android:exported="false"/>

        <receiver android:name=".services.BootReceiver">
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED"/>
            </intent-filter>
        </receiver>

        <activity
            android:name=".activities.MainActivity"
            android:label="@string/app_name"
            android:screenOrientation="portrait" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        //Other Activities

    </application>

</manifest>

引导接收器:

public class BootReceiver extends WakefulBroadcastReceiver{

    @Override
    public void onReceive(Context context, Intent intent) {
        context.startService(new Intent(context, NotificationService.class));
    }
}

通知服务:

public class NotificationService extends Service{

    private Calendar currentCalendar, plannedCalendar;

    public static final String FILENAME_SETTINGS = "MySettings";
    private static final int MODE_PRIVATE = 0;
    SharedPreferences data;

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        return START_STICKY;
    }

    private Timer timer;
    private TimerTask timerTask = new TimerTask() {
        @Override
        public void run() {
            data = getSharedPreferences(FILENAME_SETTINGS, MODE_PRIVATE);

            int plannedHour = data.getInt("alarm_hour", 0);
            int plannedMinute = data.getInt("alarm_minute", 0);
            plannedCalendar = Calendar.getInstance(Locale.getDefault());
            plannedCalendar.set(Calendar.MINUTE, plannedMinute);
            plannedCalendar.set(Calendar.HOUR_OF_DAY, plannedHour);
            plannedCalendar.set(Calendar.SECOND, 0);
            plannedCalendar.set(Calendar.MILLISECOND, 0);

            //Kalender aktualisieren
            currentCalendar = Calendar.getInstance(Locale.getDefault());
            currentCalendar.setTimeInMillis(System.currentTimeMillis());
            //Check ob es 00:00:00 Uhr ist --> Notification wieder erwuenscht!!!
            currentCalendar.set(Calendar.SECOND, 0);
            currentCalendar.set(Calendar.MILLISECOND, 0);
            if(currentCalendar.get(Calendar.SECOND) == 0 && currentCalendar.get(Calendar.MINUTE) == 0 && currentCalendar.get(Calendar.HOUR_OF_DAY) == 0){
                SharedPreferences.Editor editor = data.edit();
                editor.putBoolean("notification", false);
                editor.apply();
            }
            //Nochmal aktualisieren weil durch den "Check" manipuliert wurde
            currentCalendar = Calendar.getInstance(Locale.getDefault());
            currentCalendar.setTimeInMillis(System.currentTimeMillis());


            if((currentCalendar.getTimeInMillis() >= plannedCalendar.getTimeInMillis()) & !data.getBoolean("notification", false)) {
                PowerManager mgr = (PowerManager) getSystemService(Context.POWER_SERVICE);
                PowerManager.WakeLock wakeLock = mgr.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "MyWakeLock");
                wakeLock.acquire();

                notification();
                SharedPreferences.Editor editor = data.edit();
                editor.putBoolean("notification", true);
                editor.apply();

                wakeLock.release();
            }
        }
    };

    @Override
    public void onCreate(){
        super.onCreate();
        timer = new Timer();
        timer.schedule(timerTask, 0, 1000);
    }

    @Override
    public void onDestroy() {
        try{
            timer.cancel();
            timerTask.cancel();
        }catch (Exception e){
            e.printStackTrace();
        }
        Intent intent = new Intent("Intent");
        intent.putExtra("VALUE", "blalal");
        sendBroadcast(intent);
    }

    public void notification(){
        Context context = getApplicationContext();
        Intent intent = new Intent(context, LiveSelectActivity.class);
        PendingIntent pen = PendingIntent.getActivity(getBaseContext(), 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);

        NotificationCompat.Builder builder = new NotificationCompat.Builder(context)
                .setContentTitle(getString(R.string.hineweisTrainingsGeplant))
                .setContentText("Content")
                .setContentIntent(pen)
                .setDefaults(Notification.DEFAULT_ALL)
                .setAutoCancel(true)
                .setSmallIcon(R.drawable.ic_add_white_24dp);

        Notification notification = builder.build();
        NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        manager.notify(1, notification);
    }

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

}

使用 AlarmManager 安排 Intent 您的服务将在所需时间接收和处理的信息。如果配置正确,它确实可以工作。