在 Android 中启动服务 [英] Start service in Android

问题描述

我想在某个活动开始时调用服务.所以，这里是服务类:

I want to call a service when a certain activity starts. So, here's the Service class:

public class UpdaterServiceManager extends Service {

    private final int UPDATE_INTERVAL = 60 * 1000;
    private Timer timer = new Timer();
    private static final int NOTIFICATION_EX = 1;
    private NotificationManager notificationManager;

    public UpdaterServiceManager() {}

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

    @Override
    public void onCreate() {
        // Code to execute when the service is first created
    }

    @Override
    public void onDestroy() {
        if (timer != null) {
            timer.cancel();
        }
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startid) {
        notificationManager = (NotificationManager) 
                getSystemService(Context.NOTIFICATION_SERVICE);
        int icon = android.R.drawable.stat_notify_sync;
        CharSequence tickerText = "Hello";
        long when = System.currentTimeMillis();
        Notification notification = new Notification(icon, tickerText, when);
        Context context = getApplicationContext();
        CharSequence contentTitle = "My notification";
        CharSequence contentText = "Hello World!";
        Intent notificationIntent = new Intent(this, Main.class);
        PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
                notificationIntent, 0);
        notification.setLatestEventInfo(context, contentTitle, contentText,
                contentIntent);
        notificationManager.notify(NOTIFICATION_EX, notification);
        Toast.makeText(this, "Started!", Toast.LENGTH_LONG);
        timer.scheduleAtFixedRate(new TimerTask() {

            @Override
            public void run() {
                // Check if there are updates here and notify if true
            }
        }, 0, UPDATE_INTERVAL);
        return START_STICKY;
    }

    private void stopService() {
        if (timer != null) timer.cancel();
    }
}

我是这样称呼它的:

Intent serviceIntent = new Intent();
serviceIntent.setAction("cidadaos.cidade.data.UpdaterServiceManager");
startService(serviceIntent);

问题是什么都没有发生.上述代码块在活动的onCreate 结束时被调用.我已经调试过了，没有抛出异常.

The problem is that nothing happens. The above code block is called at the end of the activity's onCreate. I already debugged and no exception is thrown.

有什么想法吗?

推荐答案

可能您的清单中没有该服务，或者它没有匹配的 你的行动.检查 LogCat(通过 adb logcat、DDMS 或 Eclipse 中的 DDMS 透视图)应该会发现一些可能有帮助的警告.

Probably you don't have the service in your manifest, or it does not have an <intent-filter> that matches your action. Examining LogCat (via adb logcat, DDMS, or the DDMS perspective in Eclipse) should turn up some warnings that may help.

更有可能的是，您应该通过以下方式启动服务:

More likely, you should start the service via:

startService(new Intent(this, UpdaterServiceManager.class));

这篇关于在 Android 中启动服务的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！