? ?//通過(guò)viewId獲取控件
????public?<T?extends?View>T?getView(int?viewId){
????????View?viewd=mViews.get(viewId);
????????if?(viewd?==?null)?{
????????????viewd=mview.findViewById(viewId);
????????????mViews.put(viewId,viewd);
????????????return?(T)?viewd;
????????}
????}

?當(dāng)viewd?==?null時(shí)，返回一個(gè)泛型，不為空時(shí)候返回什么形式?。?/span>

不加返回值A(chǔ)S會(huì)報(bào)錯(cuò)，

返回為空時(shí)，程序調(diào)試會(huì)閃退。

求大神指點(diǎn)~