Question

我想在某项活动开始时调用服务。所以，这是服务类：

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();
    }
}

以下是我的称呼方式：

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

问题是没有任何反应。上述代码块在活动onCreate的末尾调用。我已经调试过，没有抛出任何异常。

有什么想法吗？

Answer 1

可能您的清单中没有该服务，或者它没有与您的操作匹配的<intent-filter>。检查LogCat（通过adb logcat，DDMS或Eclipse中的DDMS透视图）应该会发出一些可能有帮助的警告。

更有可能的是，您应该通过以下方式启动服务：

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

Answer 2

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

写这条线对我来说还不够。服务仍然无法正常工作。只有在清单

注册服务后，一切都有效

<application
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name" >

    ...

    <service
        android:name=".MyService"
        android:label="My Service" >
    </service>
</application>

Answer 3

开始服务：

的Java代码

从活动：

启动服务

startService(new Intent(MyActivity.this, MyService.class));

从片段：

启动服务

getActivity().startService(new Intent(getActivity(), MyService.class));

<强> MyService.java ：

import android.app.Service;
import android.content.Intent;
import android.os.Handler;
import android.os.IBinder;
import android.util.Log;

public class MyService extends Service {

    private static String TAG = "MyService";
    private Handler handler;
    private Runnable runnable;
    private final int runTime = 5000;

    @Override
    public void onCreate() {
        super.onCreate();
        Log.i(TAG, "onCreate");

        handler = new Handler();
        runnable = new Runnable() {
            @Override
            public void run() {

                handler.postDelayed(runnable, runTime);
            }
        };
        handler.post(runnable);
    }

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

    @Override
    public void onDestroy() {
        if (handler != null) {
            handler.removeCallbacks(runnable);
        }
        super.onDestroy();
    }

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

    @SuppressWarnings("deprecation")
    @Override
    public void onStart(Intent intent, int startId) {
        super.onStart(intent, startId);
        Log.i(TAG, "onStart");
    }

}

将此服务定义为Project的清单文件：

在清单文件中添加以下标记：

<service android:enabled="true" android:name="com.my.packagename.MyService" />

完成

Answer 4

我喜欢让它变得更有活力

Class<?> serviceMonitor = MyService.class; 


private void startMyService() { context.startService(new Intent(context, serviceMonitor)); }
private void stopMyService()  { context.stopService(new Intent(context, serviceMonitor));  }

不要忘记清单

<service android:enabled="true" android:name=".MyService.class" />

Answer 5

Intent serviceIntent = new Intent(this,YourActivity.class);

startService(serviceIntent);

在Manifist中添加服务

<service android:enabled="true" android:name="YourActivity.class" />

用于在oreo上运行服务以及更多设备用于地面服务并向用户显示通知

或使用地理围栏服务在后台更新位置参考 http://stackoverflow.com/questions/tagged/google-play-services

在Android中启动服务

5 个答案: