android - 带有计时器的服务调用另一个服务

Question

我正在使用服务管理从服务器到客户端和客户端到服务器的数据。因为我在登录后调用一个 Service:

context.startService(new Intent(LoginActivity.this, CheckAutoSyncReceivingOrder.class));
context.startService(new Intent(LoginActivity.this, CheckAutoSyncSendingOrder.class));

我在 Service 上面调用了一个计时器

CheckAutoSyncReceivingOrder 服务:

Its calling another service named ReceivingOrderService on Every 1 minute to get updated data from server.

public class CheckAutoSyncReceivingOrder extends Service {

    Timer timer;

    @Override
    public IBinder onBind(Intent arg0) {
        // TODO Auto-generated method stub
        Log.i(TAG, "CheckAutoSyncReceivingOrder Binding Service...");
        return null;
    }

    @Override
    public void onStart(Intent intent, int startId) {
        // TODO Auto-generated method stub

        if (timer != null) {
            timer.cancel();
            Log.i(TAG, "RECEIVING OLD TIMER CANCELLED>>>");
        }

        timer = new Timer();
        timer.schedule(new TimerTask() {
            @Override
            public void run() {
                Log.i(TAG, "<<<<<<<<< RECEIVING AUTO SYNC SERVICE <<<<<<<<");
                if (InternetConnection.checkConnection(getApplicationContext())) {
                    if (getDatabasePath(DatabaseHelper.DATABASE_NAME).exists())
                        startService(new Intent(
                                CheckAutoSyncReceivingOrder.this,
                                ReceivingOrderService.class));
                } else {
                    Log.d(TAG, "Connection not available");
                }
            }
        }, 0, 60000); // 1000*60 = 60000 = 1 minutes
    }

    @Override
    public void onDestroy() {
        // TODO Auto-generated method stub

        if (timer != null)
            timer.cancel();

        Log.d(TAG, "Stopping Receiving...");

        super.onDestroy();
    }
}

CheckAutoSyncSendingOrder 服务:

Its calling another service named SendingOrderService on Every 2.5 minute to send updated data to server.

public class CheckAutoSyncSendingOrder extends Service {

    Timer timer;

    @Override
    public void onStart(Intent intent, int startId) {
        // TODO Auto-generated method stub

        if (timer != null) {
            timer.cancel();
            Log.i(TAG, "OLD TIMER CANCELLED>>>");
        }

        timer = new Timer();

        timer.schedule(new TimerTask() {
            @Override
            public void run() {
                Log.i(TAG, ">>>>>>>> SENDING AUTO SYNC SERVICE >>>>>>>>");
                if (InternetConnection.checkConnection(getApplicationContext())) {
                    if (getDatabasePath(DatabaseHelper.DATABASE_NAME).exists())
                        startService(new Intent(CheckAutoSyncSendingOrder.this,
                                SendingOrderService.class));
                } else {
                    Log.d(TAG, "connection not available");
                }
            }
        }, 0, 150000); // 1000*60 = 60000 = 1 minutes * 2.5 = 2.5 =>Minutes
    }

    @Override
    public void onDestroy() {
        // TODO Auto-generated method stub

        if (timer != null)
            timer.cancel();

        Log.d(TAG, "Stopping Sending...");

        super.onDestroy();
    }

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

两个 Activity 都将运行直到 Internet 关闭。当 Internet 连接可用时，它会自动再次调用。

主要是我遇到了问题在自动销毁 Activity 服务调用时。

是否有任何解决方案或方法可以改变同一事物的流程？

提前致谢。

Answer 1

你必须使用 IntentService而不是 Service .

• Service在后台运行，但在应用程序的主线程上运行。
• IntentService在单独的工作线程上运行。

如果运行您的服务的进程被终止，Android 系统将自动重启它，这是默认行为。

因此，如果 Activity 的主线程被破坏，服务将重新启动，但如果您使用 IntentService并使用 START_NOT_STICKY然后它不会重新启动您的服务。

此行为由 onStartCommand() 的返回值定义在您的服务实现中。常量 START_NOT_STICKY告诉 Android 如果在进程被“杀死”时正在运行，则不要重新启动该服务。

您需要覆盖方法 onStartCommand()在您的服务类别中，将所有代码从 onStart() 中移出onStartCommand() 的方法方法。

根据 Android 文档:

For started services, there are two additional major modes of operation they can decide to run in, depending on the value they return from onStartCommand(): START_STICKY is used for services that are explicitly started and stopped as needed, while START_NOT_STICKY or START_REDELIVER_INTENT are used for services that should only remain running while processing any commands sent to them

onStart()每次重新启动服务时都会调用方法，但 onStartCommand()如果返回 START_NON_STICKY，方法将不会被调用.

有关IntentService 之间差异的更多详细信息和 Service .你可以查看this .

希望对你有帮助