改Android5.0 6.0以上尤其Nexus手机google

要更改Recent APPs列表的颜色 两行代码搞定

You can change this via ActivityManager.TaskDescription From an Activity context, call:

ActivityManager.TaskDescription taskDescription=new ActivityManager.TaskDescription(getResources().getString(R.string.app_name),null,getResources().getColor(R.color.gray));
((Activity)this).setTaskDescription(taskDescription);

参考Android官方开发者文件

https://developer.android.com/reference/android/app/ActivityManager.TaskDescription.html