Android:静态数组列表在服务中变得空洞

Question

我在服务文件 (backgroundService.java) 中声明了一个 static Arraylist 变量。一旦收到推送消息(使用 GCM)，我就会更新静态变量。我正在使用 4.0.4 设备(三星 S3)。静态变量变为空，一旦我的应用程序进入后台，然后如果我长按 memu 按钮并滑动我的应用程序(一旦我们滑动应用程序完成但不会强制停止), 服务暂停一段时间然后再次启动，即服务 onDestroy 方法没有被调用，而是在暂停之后调用 OnCreate 方法。暂停之后静态 ArrayList 变为空。如何解决？我不想让我的静态 Arraylist 失去它的值(value)..

此问题仅出现在 Android 4.0+ 版本的设备中。

public class BackgroundService extends Service 

{ 私有(private)定时器定时器=新定时器()；

Context mContext;

String LOG_TAG=BackgroundService.class.getSimpleName();
    ApplicationInfo ai;
    private static boolean isRunning = false; 
public static ArrayList<String> mDMPush=new ArrayList<String>();

@Override
public void onCreate() 
{
      super.onCreate();
      Log.e(LOG_TAG,"on create ");
      isRunning = true; 


}


@Override
public void onStart(Intent intent, int startId) {

    super.onStart(intent, startId);  


    Log.e(LOG_TAG,"mDMPush"+mDMPush);

    Log.e(LOG_TAG,"mDMPush outside if else "+mDMPush.size()+"   "+mDMPush.isEmpty());
            startService();



}

public static boolean isRunning() 
{ 
    return isRunning; 
} 

private void startService()
{        
   int delay = 100;
   int period =500;
final PackageManager pm = getPackageManager();

   timer.scheduleAtFixedRate(new TimerTask() {
       public void run() 
       {

        ActivityManager am = (ActivityManager) mContext.getSystemService(Activity.ACTIVITY_SERVICE);
        String packageName = am.getRunningTasks(1).get(0).topActivity.getPackageName();
        try {
                 ai = pm.getApplicationInfo(packageName, 0);
                 if ((ai.flags & ApplicationInfo.FLAG_SYSTEM) != 0) {


                       **Iam doing an action inside this timer using that arraylist mDMPush.. I ll add value to the arraylist once i received a push***              

                 }
           } catch (NameNotFoundException e) {
                 // TODO Auto-generated catch block
                 e.printStackTrace();
           }



       }
     }, delay, period);

}  

Answer 1

这就是你必须如何在持久性存储中保存数组列表

  Set<String> localStore = new HashSet<String>();
            List<String> list = new ArrayList<String>();
    localStore.addAll(list);
    SharedPreferences ssidPref = getSharedPreferences("ssidPref", Context.MODE_PRIVATE);
                SharedPreferences.Editor EDITIOR = ssidPref.edit();
                EDITIOR.putStringSet("ssidStored", localStore);
                EDITIOR.commit();

阅读

localStore = ssidPref.getStringSet("ssidStored", null);