请求方式的集合

package com.example.lianxi;


import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;


import com.google.gson.Gson;


import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.app.ProgressDialog;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;


public class MainActivity extends Activity {
String str = "";
private List<News> list;
private ListView lv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

lv = (ListView) findViewById(R.id.lv);

MyTask myTask = new MyTask();
myTask.execute("https://api.tianapi.com/wxnew/?key=8d6e3228d25298f13af4fc40ce6c9679&num=10");
}


//HttpURlconnection请求

class MyTask extends AsyncTask<String, Void, String>{


private ProgressDialog dialog;


@Override
protected String doInBackground(String... params) {
//请求网络的代码
try {
//创建一个Url对象
URL url = new URL(params[0]);
//打开连接
HttpURLConnection openConnection = (HttpURLConnection) url.openConnection();

//进行设置
openConnection.setRequestMethod("GET");
openConnection.setReadTimeout(3000);
openConnection.setConnectTimeout(3000);

//得到响应妈
int code = openConnection.getResponseCode();
//判断
if (code == 200) {
//得到数据
InputStream inputStream = openConnection.getInputStream();
str = streamToString(inputStream);
//进行解析
Gson gson = new Gson();
Result json = gson.fromJson(str, Result.class);
list = json.getNewslist();

}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return str;
}

@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();

dialog = new ProgressDialog(MainActivity.this);
dialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
dialog.setMessage("正在加载...");
dialog.show();
}

@Override
protected void onPostExecute(String result) {
// TODO Auto-generated method stub
super.onPostExecute(result);

if (dialog != null && dialog.isShowing()) {

dialog.dismiss();
}

MyAdapter adapter = new MyAdapter();
lv.setAdapter(adapter);
}

}

class Myimg extends AsyncTask<String, Void, Bitmap>{
private ImageView imgs;


public Myimg(ImageView imgs) {
super();
this.imgs = imgs;
}

private Bitmap bitmap;







@Override
protected Bitmap doInBackground(String... params) {
try {
URL url = new URL(params[0]);
HttpURLConnection oc = (HttpURLConnection) url.openConnection();
//设置链接超时时间
oc.setConnectTimeout(3000);
//数据返回的超时时间
oc.setReadTimeout(5000);
//数据返回
int codes = oc.getResponseCode();

if (codes == 200) {
InputStream stream = oc.getInputStream();
bitmap = BitmapFactory.decodeStream(stream);
}
} catch (Exception e) {

// TODO Auto-generated catch block
e.printStackTrace();
}
return bitmap;
}

@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
}

@Override
protected void onPostExecute(Bitmap result) {
// TODO Auto-generated method stub
super.onPostExecute(result);

imgs.setImageBitmap(bitmap);
}




}

class MyAdapter extends BaseAdapter{


@Override
public int getCount() {
// TODO Auto-generated method stub
return list.size();
}


@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return list.get(position);
}


@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}


@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = View.inflate(MainActivity.this, R.layout.item, null);
TextView  tv1 = (TextView) view.findViewById(R.id.tv1);
TextView  tv2 = (TextView) view.findViewById(R.id.tv2);
TextView  tv3 = (TextView) view.findViewById(R.id.tv3);
ImageView img = (ImageView) view.findViewById(R.id.img);

tv1.setText(list.get(position).getCtime());
tv2.setText(list.get(position).getDescription());
tv3.setText(list.get(position).getTitle());
new Myimg(img).execute(list.get(position).getPicUrl());
return view;
}

}

public String streamToString(InputStream is){

StringBuilder sb = new StringBuilder();
String con;
BufferedReader br = new BufferedReader(new InputStreamReader(is));

try {
while ((con = br.readLine())!=null) {
sb.append(con);
}
br.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return sb.toString();

}
}