week1_09month
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package animtest.com.example.e531.week1_09month;
import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ListView;
import android.widget.ProgressBar;
import com.google.gson.Gson;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.conn.ssl.AllowAllHostnameVerifier;
import org.apache.http.conn.ssl.SSLSocketFactory;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private ListView listView;private ProgressBar progressBar;@Overrideprotected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Button btnClient = (Button) findViewById(R.id.btn_client); Button btnUrl = (Button) findViewById(R.id.btn_url); listView = (ListView) findViewById(R.id.lv); progressBar=(ProgressBar) findViewById(R.id.progressBar); //初使化为 看不见的状态 progressBar.setVisibility(View.INVISIBLE); btnClient.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //执行异步任务 MyTask myTask = new MyTask(); myTask.execute(new String[]{"https://api.tianapi.com/wxnew/?key=8d6e3228d25298f13af4fc40ce6c9679&num=10", "1"}); } }); btnUrl.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //执行异步任务 MyTask myTask = new MyTask(); myTask.execute(new String[]{"https://api.tianapi.com/wxnew/?key=8d6e3228d25298f13af4fc40ce6c9679&num=10", "2"}); } });}class MyTask extends AsyncTask<String, Void, String> { @Override protected String doInBackground(String... params) { String resultStr = ""; //得到请求的类型 String type = params[1]; if ("1".equals(type)) {//如果是"1" 执行 HttpGet请求 //因为请求的是https协议的网址，eclipse下使用HttpGet请求会报错，需要添加以下这行代码 SSLSocketFactory.getSocketFactory().setHostnameVerifier(new AllowAllHostnameVerifier()); //1.创建一个HttpClient对象 HttpClient hc = new DefaultHttpClient(); //2.创建httpGet对象 HttpGet hg = new HttpGet(params[0]); try { //3.执行请求 HttpResponse response = hc.execute(hg); //4.判断结果码 int code = response.getStatusLine().getStatusCode(); if (code == 200) { //5.得到请求的结果 HttpEntity result = response.getEntity(); resultStr = EntityUtils.toString(result); } } catch (IOException e) { e.printStackTrace(); } } else if ("2".equals(type)) {//如果是2执行 HttpUrlConnection请求 try { //1.创建Url对象 URL url = new URL(params[0]); //2.打开连接 HttpURLConnection connection = (HttpURLConnection) url.openConnection(); //3.设置 connection.setRequestMethod("GET"); connection.setConnectTimeout(5000); connection.setReadTimeout(5000); //4.得到响应码，进行判断 int code = connection.getResponseCode(); if (code == 200) { //5.得到结果 InputStream inputStream = connection.getInputStream(); resultStr =streamToString(inputStream); } } catch (Exception ex) { ex.printStackTrace(); } } else { } return resultStr; } @Override protected void onPostExecute(String s) { super.onPostExecute(s); Log.d("zzz", s); //进行解析，并显示到listView上// Gson gson=new Gson();
// ResultBean resultBean=gson.fromJson(s,ResultBean.class);
List<News> newsList=new ArrayList<News>(); try { JSONObject obj=new JSONObject(s); JSONArray array=obj.optJSONArray("newslist"); for(int i=0;i<array.length();i++){ JSONObject news=array.optJSONObject(i); News ns=new News(); ns.setCtime(news.optString("ctime")); ns.setDescription(news.optString("description")); ns.setPicUrl(news.optString("picUrl")); ns.setTitle(news.optString("title")); ns.setUrl(news.optString("url")); newsList.add(ns); } } catch (JSONException e) { e.printStackTrace(); } //设置listview的适配器 MyLvAdapter adapter=new MyLvAdapter(newsList,MainActivity.this); listView.setAdapter(adapter); //请求完成时，进度条控件为不可见状态 progressBar.setVisibility(View.INVISIBLE); //请求完成时，设置listview为可见状态 listView.setVisibility(View.VISIBLE); } @Override protected void onPreExecute() { super.onPreExecute(); //设置进度条为显示的状态 progressBar.setVisibility(View.VISIBLE); //设置listview为不可见状态 listView.setVisibility(View.INVISIBLE); }}/** * 将流转换成字符串 * @param stream * @return */public String streamToString(InputStream stream) { StringBuilder builder = new StringBuilder(); try { BufferedReader br = new BufferedReader(new InputStreamReader(stream, "utf-8")); String con; while ((con = br.readLine()) != null) { builder.append(con); } } catch (Exception ex) { ex.printStackTrace(); } return builder.toString();}}
Adapter:
package animtest.com.example.e531.week1_09month;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.List;
/**
* Created by e531 on 2017/10/8.
*/
public class MyLvAdapter extends BaseAdapter {
private List<News> newsList;private Context context;public MyLvAdapter(List<News> newsList, Context context) { this.newsList = newsList; this.context = context;}public int getCount() { return newsList.size();}@Overridepublic Object getItem(int position) { return newsList.get(position);}@Overridepublic long getItemId(int position) { return position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) { ViewHolder holder; if(convertView==null){ convertView=View.inflate(context,R.layout.item,null); holder=new ViewHolder(); holder.tvDate= (TextView) convertView.findViewById(R.id.tv_date); holder.tvTitle= (TextView) convertView.findViewById(R.id.tv_title); holder.img= (ImageView) convertView.findViewById(R.id.img); convertView.setTag(holder); }else{ holder=(ViewHolder) convertView.getTag(); } holder.tvDate.setText(newsList.get(position).getCtime()); holder.tvTitle.setText(newsList.get(position).getTitle()); //图片使用异步加载 MyPicTask myPicTask=new MyPicTask(holder.img); myPicTask.execute(newsList.get(position).getPicUrl()); return convertView;}static class ViewHolder{ ImageView img; TextView tvTitle; TextView tvDate;}/** * 使用异步任务请求图片 */class MyPicTask extends AsyncTask<String,Void,Bitmap>{ private ImageView imageView; public MyPicTask(ImageView imageView){ this.imageView=imageView; } @Override protected Bitmap doInBackground(String... params) { Bitmap bitmap=null; try { //1.创建url对象 URL url=new URL(params[0]); //2.打开连接 HttpURLConnection connection= (HttpURLConnection) url.openConnection(); //3.设置 connection.setRequestMethod("GET"); connection.setConnectTimeout(5000); connection.setConnectTimeout(5000); //4.得到结果码，并且判断 int code=connection.getResponseCode(); if(code==200){ //5.得到结果 InputStream inputStream=connection.getInputStream(); //将流转换成Bitmap对象 bitmap=BitmapFactory.decodeStream(inputStream); } } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return bitmap; } @Override protected void onPostExecute(Bitmap bitmap) { super.onPostExecute(bitmap); //显示图片 imageView.setImageBitmap(bitmap); }}}
工具类:
ResultBean:
public class ResultBean {
private String code;
private String msg;
private List newslist;
News:
public class News {
private String ctime;
private String description;
private String picUrl;
private String title;
private String url;
layout:
<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="animtest.com.example.e531.week1_09month.MainActivity"> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="HttpClient请求" android:id="@+id/btn_client" android:layout_alignParentTop="true" android:layout_alignParentLeft="true" android:layout_alignParentStart="true" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="HttpURLConnect请求" android:id="@+id/btn_url" android:layout_alignParentTop="true" android:layout_alignParentRight="true" android:layout_alignParentEnd="true" /> <FrameLayout android:layout_width="match_parent" android:layout_below="@+id/btn_client" android:layout_height="match_parent" > <ListView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/lv" android:layout_alignParentLeft="true" android:layout_gravity="center" /> <ProgressBar style="?android:attr/progressBarStyleLarge" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/progressBar" android:layout_gravity="center" /> </FrameLayout></RelativeLayout>List_iteam:<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <ImageView android:layout_width="60dp" android:layout_height="60dp" android:layout_alignParentLeft="true" android:id="@+id/img" android:scaleType="fitXY"/> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/tv_title" android:layout_toRightOf="@id/img" android:padding="5dp"/> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/tv_date" android:layout_toRightOf="@+id/img" android:layout_below="@id/tv_title" android:padding="5dp"/></RelativeLayout>
