Android后台服务确定前台应用程序

Question

我正在开发一款能够全天监控手机使用情况的应用程序.为此,我有一个后台服务,它从设备启动开始,并继续轮询以找出当前前台应用程序是什么.当我单击一个应用程序然后退出它并单击另一个应用程序时,以下代码有效.现在假设我打开浏览器并转到另一个网页,它将停止将浏览器注册为前台应用程序.或者,例如,我打开google talk,它会将其注册为当前活动,但是当我发送消息时,它将不再将其注册为前台应用程序.关于这个bug可能是什么原因的任何想法或想法？如果需要,我会提供任何其他信息,请告诉我.也许答案在于这篇文章,我找不到它...... 从后台任务或服务中确定当前的前台应用程序

public static RunningAppProcessInfo getForegroundApp() throws NameNotFoundException{
    RunningAppProcessInfo result = null, info = null;
    String currApp = null;
    am = (ActivityManager)context.getSystemService(ACTIVITY_SERVICE);
    Drawable icon = null;
List <RunningAppProcessInfo> l = am.getRunningAppProcesses();
Iterator <RunningAppProcessInfo> i = l.iterator();
PackageManager pm = context.getPackageManager();

while(i.hasNext()){
    info = i.next();
        if(info.importance == RunningAppProcessInfo.IMPORTANCE_FOREGROUND && getActivityForApp(info)!=null ){

            try {
                currApp = getCurrentApplication(info);
                System.out.println(currApp);
                System.out.println(pm.getApplicationInfo(info.processName, PackageManager.GET_META_DATA));
                icon = pm.getApplicationIcon(pm.getApplicationInfo(info.processName, PackageManager.GET_META_DATA));
                System.out.println(getActivityForApp(info));
            } catch (NameNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            }
        }
    break;       
}

return result;

}

private static ComponentName getActivityForApp(RunningAppProcessInfo target){
    ComponentName result=null;
    ActivityManager.RunningTaskInfo info;

    if(target==null)
        return null;

    if(am==null)
        am = (ActivityManager)context.getSystemService(Context.ACTIVITY_SERVICE);
    List <ActivityManager.RunningTaskInfo> l = am.getRunningTasks(9999);
    Iterator <ActivityManager.RunningTaskInfo> i = l.iterator();

    while(i.hasNext()){
        info=i.next();
        if(info.baseActivity.getPackageName().equals(target.processName)){
            result=info.topActivity;
            break;
        }
    }
    return result;
}

Answer 1

下面的代码适合我.列表中的第一个任务是我需要确定前台应用程序名称.

ActivityManager activityManager = (ActivityManager) getSystemService(UpdateService.ACTIVITY_SERVICE);
List<ActivityManager.RunningTaskInfo> appProcesses = activityManager.getRunningTasks(1);

Log.i("MyApp", "Foreground Package: " + appProcesses.get(0).topActivity.getPackageName());