前台服务(在通知栏显示服务)

关键代码:

public class MyService extends Service {
    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onCreate() {

        Intent notifyIntent = new Intent(this, MainActivity.class);
        PendingIntent pendingIntent = PendingIntent.getActivity(this,
                0, notifyIntent,0);

        Notification notification = new Notification.Builder(this).
                setSmallIcon(R.mipmap.ic_launcher).
                setContentTitle("通知").
                setContentText("我是服务的通知").
                setContentIntent(pendingIntent).
                setDefaults(Notification.DEFAULT_ALL). // 设置用手机默认的震动或声音来提示
                build();

        // 设置为前台服务,在系统状态栏显示
        startForeground(1, notification);

        super.onCreate();
    }
}