Android 服务无法启动 Intent 和 NullPointerException

Question

我正在创建一个后台服务(在它自己的进程中)并且在让它工作时遇到了很多麻烦。我试图在应用程序启动时启动它，但我在日志中收到无法启动服务并出现 Intent 错误。我一直在浏览论坛、示例(和谷歌)，但找不到我做错了什么。

这是我得到的错误:
E/AndroidRuntime(1398): java.lang.RuntimeException: 无法使用 Intent { cmp=xxxx } 启动服务 com.test.alarms.AlarmService@41550cb0: java.lang.NullPointerException

在我的 Activity 中:

startService(new Intent(AlarmService.class.getName()));

服务类是:

package com.test.alarms;


public class AlarmService extends Service{

Context context; 

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

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

@Override
public void onDestroy() {
//code to execute when the service is shutting down
}

@Override
public void onStart(Intent intent, int startid) {
//code to execute when the service is starting up
    Intent i = new Intent(context, StartActivity.class);
    PendingIntent detailsIntent = PendingIntent.getActivity(this, 0, i, 0);

    NotificationManager notificationSingleLine = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
    Notification notificationDropText = new Notification(R.drawable.ic_launcher, "Alarm for...", System.currentTimeMillis());

    CharSequence from = "Time for...";
    CharSequence message = "Alarm Text";        
    notificationDropText.setLatestEventInfo(this, from, message, detailsIntent);

    notificationDropText.vibrate = new long[] { 100, 250, 100, 500};        
    notificationSingleLine.notify(0, notificationDropText);
}

list 文件有:

<service
        android:name=".AlarmService"
        android:process=":remote">
        <intent-filter>
            <action android:name="com.test.alarms.AlarmService"/>
        </intent-filter>
    </service>

谢谢，

Answer 1

也许问题是您覆盖了 OnCreate 和 OnDestroy，但您没有调用 super.Oncreate() 和 super.onDestroy()。

如果不行试试

startService(new Intent(context , AlarmService.class));

编辑: 也可以在 onStart 中使用它

Intent i = new Intent(this, StartActivity.class);

代替

Intent i = new Intent(context, StartActivity.class);