判断是否存在的代码：
private static boolean c(Activity paramActivity)
{
List localList = ((ActivityManager)paramActivity.getSystemService("activity")).getRunningTasks(1);
return (localList.size() > 0) && ("com.rytong.egbank".equals(((ActivityManager.RunningTaskInfo)localList.get(0)).topActivity.getPackageName()));
}
{
List localList = ((ActivityManager)paramActivity.getSystemService("activity")).getRunningTasks(1);
return (localList.size() > 0) && ("com.rytong.egbank".equals(((ActivityManager.RunningTaskInfo)localList.get(0)).topActivity.getPackageName()));
}
需要增加权限：<uses-permission android:name="android.permission.GET_TASKS" />