XListeView和Imageloader的使用

package com.example.myapplication;

import android.app.ProgressDialog;

import android.os.AsyncTask;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import com.example.myapplication.bean.MenuInfo;

import com.example.myapplication.utils.StreamTools;

import com.google.gson.Gson;

import com.limxing.xlistview.view.XListView;

import java.io.IOException;

import java.io.InputStream;

import java.net.HttpURLConnection;

import java.net.URL;

import java.net.URLEncoder;

import java.util.List;

public class MainActivity extends AppCompatActivity implements XListView.IXListViewListener {

private XListView lv;
private ProgressDialog dialog;
private int pageIndex = 1;
private MyBaseAdapter adapter;
//是否上拉
private boolean isLoadMore = true;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

lv = (XListView) findViewById(R.id.lv);
//设置是否允许上拉加载更多
lv.setPullLoadEnable(true);
lv.setXListViewListener(this);

//设置适配器
getData("http://apis.juhe.cn/cook/query.php?menu="+
URLEncoder.encode("秘制红烧肉")+"&key="+
URLEncoder.encode("a7a42220c5c1c5268be7ba25af764f6c")+"&pn="+pageIndex);

}

//这是请求菜谱信息操作
private void getData(String path){

new AsyncTask<String,Void,String >(){
@Override

protected void onPreExecute() {
super.onPreExecute();
//执行加载进度框
dialog = new ProgressDialog(MainActivity.this);
dialog.setMessage("玩命加载中...");
dialog.show();

}

@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
//隐藏进度条
dialog.dismiss();

if(s != null){

Gson gson = new Gson();
MenuInfo menuInfo = gson.fromJson(s,MenuInfo.class);
//设置数据
if(adapter == null) {
adapter = new MyBaseAdapter(MainActivity.this, menuInfo.getResult().
getData());
lv.setAdapter(adapter);
}else{
adapter.loadMore(menuInfo.getResult().getData(),isLoadMore);
//刷新适配器
adapter.notifyDataSetChanged();
}

}

}

@Override
protected String doInBackground(String... params) {
try {
String path = params[0];

URL url = new URL(path);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
connection.setConnectTimeout(5*1000);
connection.setReadTimeout(5*1000);
//与服务器建立连接
connection.connect();

//服务器响应
int code = connection.getResponseCode();

if(code == 200){
InputStream is = connection.getInputStream();
String str = StreamTools.readFromeNetWork(is);

return str;

}
} catch (Exception e) {
e.printStackTrace();
}

return null;
}
}.execute(path);
}

@Override
public void onRefresh() {
//执行网络请求
isLoadMore = false;
++pageIndex;
getData("http://apis.juhe.cn/cook/query.php?menu="+
URLEncoder.encode("秘制红烧肉")+"&key="+
URLEncoder.encode("a7a42220c5c1c5268be7ba25af764f6c")+"&pn="+pageIndex);
//停止刷新
lv.stopRefresh(true);
}

@Override
public void onLoadMore() {

isLoadMore = true;
++pageIndex;
getData("http://apis.juhe.cn/cook/query.php?menu="+
URLEncoder.encode("秘制红烧肉")+"&key="+
URLEncoder.encode("a7a42220c5c1c5268be7ba25af764f6c")+"&pn="+pageIndex);
//停止显示上拉的V
lv.stopLoadMore();

}

}

————-适配器———————-

package com.example.myapplication;

import android.content.Context;

import android.graphics.Bitmap;

import android.util.Log;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.ImageView;

import android.widget.TextView;

import android.widget.Toast;

import com.example.myapplication.bean.MenuInfo;

import com.example.myapplication.utils.ImageLoaderAsyncTask;

import com.nostra13.universalimageloader.core.ImageLoader;

import java.util.List;

public class MyBaseAdapter extends BaseAdapter {

private static final String TAG = "MyBaseAdapter";
private Context context;
private List<MenuInfo.ResultBean.DataBean> list;

public MyBaseAdapter(Context context, List<MenuInfo.ResultBean.DataBean> list) {
this.context = context;
this.list = list;
}

@Override
public int getCount() {
return list != null ? list.size() : 0;
}

@Override
public Object getItem(int position) {
return null;
}

@Override
public long getItemId(int position) {
return 0;
}

/**
* 加载更多
*/
public void loadMore(List<MenuInfo.ResultBean.DataBean> lists,boolean isLast) {

for (MenuInfo.ResultBean.DataBean dataBean : lists) {

if(isLast) {
//添加数据
list.add(dataBean);
}else{
//添加到最前面
list.add(0,dataBean);
}
}

}

@Override
public View getView(int position, View convertView, ViewGroup parent) {

if (convertView == null) {
convertView = convertView.inflate(context, R.layout.item, null);

}

ImageView ivIcon = (ImageView) convertView.findViewById(R.id.ivIcon);
TextView tvContent = (TextView) convertView.findViewById(R.id.tvContent);
tvContent.setText(list.get(position).getTags());
///ImageLoader.getInstance().displayImage(list.get(position).getAlbums().get(0),ivIcon);
loadImage(list.get(position).getAlbums().get(0), ivIcon);
return convertView;

}

private void loadImage(String url, final ImageView ivIcon) {

new ImageLoaderAsyncTask(new ImageLoaderAsyncTask.ImageCallBack() {
@Override
public void callBack(Bitmap bitmap) {

if (bitmap != null) {
ivIcon.setImageBitmap(bitmap);
} else {
Log.e(TAG, "callBack : 加载失败");
}

}
}).execute(url);

}

}

———————ImageLoader———————-

package com.example.myapplication;

import android.app.Application;

import com.nostra13.universalimageloader.core.ImageLoader;

import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;

public class MyApplication extends Application {

@Override
public void onCreate() {
super.onCreate();
ImageLoaderConfiguration configuration = ImageLoaderConfiguration.createDefault(this);
ImageLoader.getInstance().init(configuration);
}

}

—————–工具类——————-

package com.example.myapplication.utils;

import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.io.InputStream;

public class StreamTools {

public static String readFromeNetWork(InputStream is){

try {

ByteArrayOutputStream baos = new ByteArrayOutputStream();

byte[] buffer = new byte[1024];
int len = 0;
while ((len = is.read(buffer)) != -1){

baos.write(buffer,0,len);

}
//关闭流
is.close();
return baos.toString();

} catch (Exception e) {
e.printStackTrace();
}

return null;

}

}

——————–不使用Imageloader的读取图片——————

package com.example.myapplication.utils;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.os.AsyncTask;

import com.nostra13.universalimageloader.core.ImageLoader;

import java.io.InputStream;

import java.net.HttpURLConnection;

import java.net.URL;

public class ImageLoaderAsyncTask extends AsyncTask