Question

我已经创建了一项服务，可以将笔记记录在Recicle箱中，它必须每天运行一次，但是如果使用处理程序，我认为它将消耗过多的电池，所以我需要您的帮助，我该如何完成一次任务一天没有电池耗尽或其他不是操作员的东西吗？

启动该应用程序后，便会创建NotesApplication并启动NotesService类，该应用程序应该全天执行，但会耗尽电池电量，因此我需要每天执行一次

NotesApplication

public class NotesApplication extends Application {

String TAG = "NotesApplication";
Intent intent;

@Override
public void onCreate() {
    // TODO: Implement this method
    super.onCreate();
    Log.d(TAG, "Application created");
    intent = new Intent(getApplicationContext(), NotesService.class);
    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){
        Log.d(TAG, "Foreground service started");
        getApplicationContext().startForegroundService(intent);
    }else if(Build.VERSION.SDK_INT < Build.VERSION_CODES.O){
        Log.d(TAG, "Service started");
        getApplicationContext().startService(intent);
    }
}

注释服务

public class NotesService extends Service {

ArrayList<Notes> listNotas;
String TAG = "NotesService";
SQLiteHelperConnection conn;

@Override
public void onCreate()
{
    // TODO: Implement this method
    super.onCreate();
    Log.d(TAG, "Notes service created");
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){
        final NotificationManager mNotific= (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
        CharSequence name = "Axco";
        String description = "Service";
        int importance = NotificationManager.IMPORTANCE_MIN;
        final String ChannelID="Service Channel";
        NotificationChannel mChannel = new NotificationChannel(ChannelID, name, importance);
        mChannel.setDescription(description); 
        mChannel.setLightColor(ThemeClass.getColor()); 
        mChannel.canShowBadge(); 
        mChannel.setShowBadge(true); 
        mNotific.createNotificationChannel(mChannel);
        final int code = 101; 
        String body= "Service Running";
        Notification notification = new Notification.Builder(this, ChannelID)
            .setContentTitle(getPackageName())
            .setContentText(body)
            .setBadgeIconType(R.drawable.ic_launcher)
            .setNumber(1)
            .setSmallIcon(R.drawable.ic_launcher)
            .setAutoCancel(true)
            .build();
        startForeground(code, notification);
    }
    conn = new SQLiteHelperConnection(this, "db_notas.db", null, 1);
    listNotas = new ArrayList<Notes>();
}

@Override
public int onStartCommand(Intent intent, int flags, int startId)
{
    // TODO: Implement this method
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){
        final NotificationManager mNotific= (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
        CharSequence name = "Axco";
        String description = "Service";
        int importance = NotificationManager.IMPORTANCE_MIN;
        final String ChannelID="Service Channel";
        NotificationChannel mChannel = new NotificationChannel(ChannelID, name, importance);
        mChannel.setDescription(description); 
        mChannel.setLightColor(ThemeClass.getColor()); 
        mChannel.canShowBadge(); 
        mChannel.setShowBadge(true); 
        mNotific.createNotificationChannel(mChannel);
        final int code = 101; 
        String body= "Service Running";
        Notification notification = new Notification.Builder(this, ChannelID)
            .setContentTitle(getPackageName())
            .setContentText(body)
            .setBadgeIconType(R.drawable.ic_launcher)
            .setNumber(1)
            .setSmallIcon(R.drawable.ic_launcher)
            .setAutoCancel(true)
            .build();
        startForeground(code, notification);
    }
    final Handler handler = new Handler();
    Runnable runnable = new Runnable(){
        @Override
        public void run()
        {
            // TODO: Implement this method
            Log.d(TAG, "Service running");
            listNotas.clear();
            consult();
            check();
            handler.postDelayed(this, 15000);
        }
    };
    handler.post(runnable);
    return Service.START_STICKY;
}

private void consult(){
    Log.d(TAG, "Consulting...");
    SQLiteDatabase db = conn.getReadableDatabase();

    Notes notas = null;

    Cursor cursor = db.rawQuery("SELECT * FROM "+Utilities.TABLA_NOTA, null);

    while (cursor.moveToNext()) {
        notas = new Notes();
        notas.setId(cursor.getString(0));
        notas.setLastModified(cursor.getString(5));
        notas.setLastModifiedDate(cursor.getString(7));

        boolean a = Boolean.valueOf(cursor.getString(4));

        if(a){
            listNotas.add(notas);
        }
    }
}

private void check(){
    //Do something
}

private void deleteNote(int position){
    SQLiteDatabase db = conn.getWritableDatabase();
    String[] parametros = {listNotas.get(position).getId()};
    db.delete(Utilities.TABLA_NOTA, Utilities.ID+"=?", parametros);
    listNotas.remove(position);
}

@Override
public IBinder onBind(Intent p1){
    // TODO: Implement this method
    return null;
}

Answer 1

使用警报管理器很有效。查看实现

AlarmManager am=(AlarmManager)context.getSystemService(Context.ALARM_SERVICE);

Intent i= new Intent(context, AlarmManagerBroadcastReceiver.class);

//intent.putExtra(something you want to put);

PendingIntent pi = PendingIntent.getBroadcast(context, 0, i, 0);

Calendar calendar = Calendar.getInstance();

calendar.setTimeInMillis(System.currentTimeMillis());

// check if it is more than 11 am. if so set alarm for next day

if (Calendar.getInstance().get(Calendar.HOUR_OF_DAY)) {
    calendar.add(Calendar.DAY_OF_YEAR, 1);
}

// everyday at 11 am
calendar.set(Calendar.HOUR_OF_DAY, 9);
calendar.set(Calendar.MINUTE, 0);
calendar.set(Calendar.SECOND, 0);


am.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(),
        AlarmManager.INTERVAL_DAY, pi);
// alarm set

最后创建一个广播接收器以完成所需的工作。

每天在Oreo上运行一次警报服务

1 个答案: