Android如何获取到正在运行Activity的缩略图，RunningTaskInfo的thumbnail属性获取总是为空，求解

Question

[size=medium][color=red]Android如何获取到正在运行Activity的缩略图，RunningTaskInfo的thumbnail属性获取总是为空，求解![/color][/size]

[code="java"]
public void getAppProcesses(){
taskPics = new ArrayList();
ActivityManager actManager = (ActivityManager)this.getSystemService(Activity.ACTIVITY_SERVICE);
List runningApp = actManager.getRunningTasks(10);
PackageManager pm = TaskDemActivity.this.getPackageManager();
for(RunningTaskInfo tempApp : runningApp){
String pkgName=tempApp.baseActivity.getPackageName();
if(tempApp.thumbnail == null){
taskPics.add(getResources().getDrawable(R.drawable.icon));
}else{
taskPics.add(new BitmapDrawable(tempApp.thumbnail));
}

        System.out.println("tempApp.thumbnail=="+tempApp.thumbnail);
   }

}

[/code]

Answer 1

[code="java"]http://www.bangchui.org/read.php?tid=12612&page=1[/code]