通過viewId獲取控件，泛型返回值
??//通過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，返回一個泛型，不為空時候返回什么形式?。?/p>
不加返回值A(chǔ)S會報錯，
返回為空時，程序調(diào)試會閃退。
求大神指點(diǎn)~
2016-07-16
public <T extends View>T getView(int viewId)
{
View view = mViews.get(viewId);
if (null == view)
{
//下一行是這么寫的
view = mConvertView.findViewById(viewId);
mViews.put(viewId, view);
}
return (T) view;
}