Android 从服务发送到活动的数据已丢失。为什么？

我是android新手，我的服务中有以下代码：

int icon = R.drawable.gcm_notification;
long when = System.currentTimeMillis();
String notificationText = "Message From SimplePay";

//get the notification service
NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
Notification notification = new Notification(icon,notificationText,when);
String title = context.getString(R.string.app_name);

String messageBody = "You have " + 1 + " payment request pending";

Intent notificationIntent = new Intent(context,InvoiceActivity.class);

notificationIntent.putExtra("invoice",message);

 System.out.println(message);

//always create a new activity! So recent values get updated
PendingIntent intent = PendingIntent.getActivity(context,0,notificationIntent,PendingIntent.FLAG_ONE_SHOT);
notification.setLatestEventInfo(context,title,messageBody,intent);
notification.flags |= Notification.FLAG_AUTO_CANCEL;
notificationManager.notify(0,notification);

我可以看到我传递给intent的

消息

是存在的（即它不是

null

）。但是在我的

InvoiceActivity

方面，当我试图获取

消息

值时，我总是得到

null

。我在

InvoiceActivity

中使用以下代码：

 Bundle extras = getIntent().getExtras();
 message = extras.getString("invoice");
 System.out.println(message); //always null

我不知道为什么会这样。我在哪里犯了错误

---

提前感谢。

这是我为该服务准备的：（确保您在onReceive中使用了正确的意图。onReceive接收到一个意图；启动该服务的意图。我注意到，当Eclipse创建onReceive时，意图参数的默认名称是“intent”（您不想使用此名称）。另外，为什么要使用变量上下文而不是关键字this？服务类扩展了扩展上下文的ContextWrapper

package com.example.solution;

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

public class Serv extends Service {

    @Override
    public IBinder onBind(Intent arg0) {
        // TODO Auto-generated method stub
        return null;
    }

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

        String message = "Hello";
        long when = System.currentTimeMillis();
        String notificationText = "Message From SimplePay";

        //get the notification service
        NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        Notification notification = new Notification(R.drawable.ic_launcher, notificationText,when);
        String title = this.getString(R.string.app_name);

        String messageBody = "You have " + 1 + " payment request pending";

        Intent notificationIntent = new Intent(this,InvoiceActivity.class);

        notificationIntent.putExtra("invoice",message);



        //always create a new activity! So recent values get updated
        PendingIntent intentp = PendingIntent.getActivity(this,0,notificationIntent,PendingIntent.FLAG_ONE_SHOT);
        notification.setLatestEventInfo(this,title,messageBody,intentp);
        notification.flags |= Notification.FLAG_AUTO_CANCEL;
        notificationManager.notify(0,notification);
        return START_STICKY;
    }

}

以下是主要活动（启动器）

这是发票活动

package com.example.solution;

import android.app.Activity;
import android.util.Log;

public class InvoiceActivity extends Activity {
@Override
protected void onResume() {
    // TODO Auto-generated method stub
    super.onResume();

    Log.e("MESSAGE",getIntent().getExtras().getString("invoice"));
}
}

---

希望这对您有所帮助

如果您的活动正在运行，那么新的意图可能会在onNewIntent中实现

@Override
protected void onNewIntent(Intent intent)
{
    super.onNewIntent(intent);

    message = getIntent().getStringExtra("invoice");
    System.out.println(message); //always null 
} 

---

你用哪种方法抓住了这个机会data@StinePike：OnCreate方法。

@Override
protected void onNewIntent(Intent intent)
{
    super.onNewIntent(intent);

    message = getIntent().getStringExtra("invoice");
    System.out.println(message); //always null 
}