Android实现从服务类到扩展服务类的意图

Question

有机器人专家吗？请帮我解决这个..。

我有一个活动类，它将意向数据传递给Service，如下所示

活动类

public class UsherActivity extends ListActivity {
    ...

    public void createNotification() {

        int subtotal = 580;


        Intent serviceIntent = new Intent(this, SampleOverlayService.class);
        serviceIntent.putExtra("box", "8");
        serviceIntent.putExtra("tot", subtotal);
        startService(serviceIntent);

    }
}

我的SampleOverlayService类如下所示:请注意，"subtotal_from_intent_putExtra_Here"...this是我希望数据显示的地方。

import android.app.Notification;
import android.app.PendingIntent;

import android.content.Intent;

public class SampleOverlayService extends OverlayService {

    public static SampleOverlayService instance;

    private SampleOverlayView overlayView;

    @Override
    public void onCreate() {
        super.onCreate();

        instance = this;

        overlayView = new SampleOverlayView(this);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();

        if (overlayView != null) {
            overlayView.destory();
        }

    }

    static public void stop() {
        if (instance != null) {
            instance.stopSelf();
        }
    }

    @Override
    protected Notification foregroundNotification(int notificationId) {
        Notification notification;

        notification = new Notification(R.drawable.ic_launcher, "getString(R.string.title_notification), System.currentTimeMillis());

        notification.flags = notification.flags | Notification.FLAG_ONGOING_EVENT | Notification.FLAG_ONLY_ALERT_ONCE;

        notification.setLatestEventInfo(this, "subtotal_from_intent_putExtra_Here", getString(R.string.message_notification), notificationIntent());

        return notification;
    }


    private PendingIntent notificationIntent() {
        Intent intent = new Intent(this, SampleOverlayHideActivity.class);

        PendingIntent pending = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);

        return pending;
    }

}

OverlayService类如下所示

import android.app.Notification;
import android.app.NotificationManager;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;

public class OverlayService extends Service {

    protected boolean foreground = false;
    protected boolean cancelNotification = false;
    protected int id = 0;

    protected Notification foregroundNotification(int notificationId) {
        return null;
    }

    public void moveToForeground(int id, boolean cancelNotification) {
        moveToForeground(id, foregroundNotification(id), cancelNotification);
    }

    public void moveToForeground(int id, Notification notification, boolean cancelNotification) {
        if (! this.foreground && notification != null) {
            this.foreground = true;
            this.id = id;
            this.cancelNotification = cancelNotification;

            super.startForeground(id, notification);
        } else if (this.id != id && id > 0 && notification != null) {
            this.id = id;
            ((NotificationManager) getSystemService(NOTIFICATION_SERVICE)).notify(id, notification);
        }
    }


    public void moveToBackground(int id, boolean cancelNotification) {
        foreground = false;
        id = 0;
        super.stopForeground(cancelNotification);
    }

    public void moveToBackground(int id) {
        moveToBackground(id, cancelNotification);
    }

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

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

}

我真的尝试过不同的方法，但都没有用。我刚得到java.lang.nullPointerException自从intent.getExtras()..。在我放置它的地方返回null。如何将小计输入通知？

提前谢谢。

编辑：，我来自https://gist.github.com/bjoernQ/6975256

Answer 1

在onStartCommand(Intent intent,, int flags, int startId)中重写SampleOverlayService。

代码：

public class SampleOverlayService extends OverlayService {

private int totalCount = 0;

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        totalCount = intent.getIntExtra("tot", 0);
        return super.onStartCommand(intent, flags, startId);
    }

}

这将在totalCount变量中获得值，您可以相应地使用该值。

Answer 2

意图被传递给'onStartCommand‘方法