偶遇一个不错的懒加载fragment实现，仅记录。
public abstract class LazyFragment extends BaseFragment {
protected boolean isViewInitiated; //控件是否初始化完成
protected boolean isVisibleToUser; //页面是否可见
protected boolean isDataInitiated; //数据是否加载
@Override
public void setUserVisibleHint(boolean isVisibleToUser) {
super.setUserVisibleHint(isVisibleToUser);
this.isVisibleToUser = isVisibleToUser;
prepareFetchData(false);
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
isViewInitiated = true;
prepareFetchData(false);
}
public abstract void loadData();
protected void prepareFetchData(boolean forceUpdate) {
if (isVisibleToUser && isViewInitiated && (!isDataInitiated || forceUpdate)) {
loadData();
isDataInitiated = true;
}
}
}
