package com.com.mr_wrong.ImageLoaderWithCaches;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import com.example.mr_wrong.androidstudioproject.R;
import java.util.List;
/**
* Created by Mr_Wrong on 2015/5/2.
*/
public class MyAdapterUseCaches extends BaseAdapter implements AbsListView.OnScrollListener {
private LayoutInflater mInflater;
private List<String> mData;
private ImageLoaderWithCaches mImageLoader;
private int mStart = 0, mEnd = 0;
private boolean mFirstFlag;
public MyAdapterUseCaches(Context context, List<String> data, ListView listView) {
this.mData = data;
mInflater = LayoutInflater.from(context);
mImageLoader = new ImageLoaderWithCaches(listView);
mImageLoader.loadImages(mStart, mEnd);
mFirstFlag = true;
listView.setOnScrollListener(this);
}
@Override
public int getCount() {
return mData.size();
}
@Override
public Object getItem(int position) {
return mData.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
String url = mData.get(position);
ViewHolder viewHolder = null;
if (convertView == null) {
viewHolder = new ViewHolder();
convertView = mInflater.inflate(R.layout.listview_item, null);
viewHolder.imageView =
(ImageView) convertView.findViewById(R.id.iv_lv_item);
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
viewHolder.imageView.setTag(url);
viewHolder.imageView.setImageResource(R.mipmap.ic_launcher);
mImageLoader.showImage(url, viewHolder.imageView);
return convertView;
}
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
if (scrollState == SCROLL_STATE_IDLE) {
mImageLoader.loadImages(mStart, mEnd);
} else {
mImageLoader.cancelAllTasks();
}
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
mStart = firstVisibleItem;
mEnd = firstVisibleItem + visibleItemCount;
if (mFirstFlag && visibleItemCount > 0) {
mImageLoader.loadImages(mStart, mEnd);
mFirstFlag = false;
}
}
public class ViewHolder {
public ImageView imageView;
}
}