Fragment 延迟加载的实现（打开之后再加载数据）

import net.duohuo.dhroid.activity.BaseActivity;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class MyAlbumFragment extends BaseFragment {

private View mView;
private Context mActivity;

// 标志位，标志已经初始化完成。
private boolean isPrepared;
protected boolean isVisible;

private MyAlbumFragment() {
     super();
}

public static BaseFragment newInstance() {
     MyAlbumFragment f = new MyAlbumFragment();
     return f;
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
     Bundle savedInstanceState) {
     mActivity = getActivity();
     if (mView != null) {
                 ViewGroup parent = (ViewGroup) mView.getParent();
        if (parent != null) {
                  parent.removeView(mView);
        }
        return mView;
   } else {
     mView = inflater.inflate(R.layout.fragmeng_mt_topics, null);
   }
   initViews();

   isPrepared = true;
   loadData();
   return mView;
}

@Override
public void setUserVisibleHint(boolean isVisibleToUser) {
         super.setUserVisibleHint(isVisibleToUser);
         if (getUserVisibleHint()) {
                isVisible = true;
                onVisible();
         } else {
               isVisible = false;
         }
}

private void initViews() {
         // TODO Auto-generated method stub
}

private void onVisible() {
          loadData();
}

public void loadData() {
         if (!isPrepared || !isVisible) {
                 return;
          }
         //这里可以判断是否有数据，本地有数据可以不做网络请求
}