android httpclient

 res/layout/main.xml的内容如下：

 

01<?xmlversion="1.0"encoding="utf-8"?>

02<LINEARLAYOUTandroid:layout_height="fill_parent"android:layout_width="fill_parent"android:orientation="vertical"xmlns:android="http://schemas.android.com/apk/res/android">

03  

04<TEXTVIEWandroid:layout_height="wrap_content"android:layout_width="fill_parent"android:text="网络连接测试"android:id="@+id/TextView01"/>

05  

06<BUTTONtype=submitandroid:layout_height="wrap_content"android:layout_width="wrap_content"android:text="使用URLConnection访问GoogleWeatherAPI"android:id="@+id/Button01">

07</BUTTON>

08  

09<BUTTONtype=submitandroid:layout_height="wrap_content"android:layout_width="wrap_content"android:text="使用HttpClient访问GoogleWeatherAPI"android:id="@+id/Button02">

10</BUTTON>

11  

12<SCROLLVIEWandroid:layout_height="wrap_content"android:layout_width="wrap_content"android:id="@+id/ScrollView01">

13    <TEXTVIEWandroid:layout_height="wrap_content"android:layout_width="wrap_content"android:id="@+id/TextView02">

14    </TEXTVIEW>

15</SCROLLVIEW>

16</LINEARLAYOUT>

3、MainActivity.java的内容如下：

 

001package android.basic.lesson30;

002  

003import java.io.InputStreamReader;

004import java.net.HttpURLConnection;

005import java.net.URL;

006  

007import org.apache.http.client.ResponseHandler;

008import org.apache.http.client.methods.HttpGet;

009import org.apache.http.impl.client.BasicResponseHandler;

010import org.apache.http.impl.client.DefaultHttpClient;

011  

012import android.app.Activity;

013import android.os.Bundle;

014import android.view.View;

015import android.widget.Button;

016import android.widget.TextView;

017import android.widget.Toast;

018  

019public class MainActivity extendsActivity {

020  

021    TextView tv;

022  

023    String googleWeatherUrl1 ="http://www.google.com/ig/api?weather=zhengzhou";

024    String googleWeatherUrl2 ="http://www.google.com/ig/api?hl=zh-cn&weather=zhengzhou";

025  

026    /** Called when the activity is first created. */

027    @Override

028    publicvoidonCreate(Bundle savedInstanceState) {

029        super.onCreate(savedInstanceState);

030        setContentView(R.layout.main);

031  

032        // 定义UI组件

033        Button b1 = (Button) findViewById(R.id.Button01);

034        Button b2 = (Button) findViewById(R.id.Button02);

035        tv = (TextView) findViewById(R.id.TextView02);

036  

037        // 设置按钮单击监听器

038        b1.setOnClickListener(newView.OnClickListener() {

039            @Override

040            publicvoidonClick(View v) {

041                // 使用URLConnection连接GoogleWeatherAPI

042                urlConn();

043            }

044        });

045  

046        // 设置按钮单击监听器

047        b2.setOnClickListener(newView.OnClickListener() {

048            @Override

049            publicvoidonClick(View v) {

050                // 使用HttpCient连接GoogleWeatherAPI

051                httpClientConn();

052  

053            }

054        });

055  

056    }

057  

058    // 使用URLConnection连接GoogleWeatherAPI

059    protectedvoidurlConn() {

060  

061        try{

062            // URL

063            URL url =newURL(googleWeatherUrl1);

064            // HttpURLConnection

065            HttpURLConnection httpconn = (HttpURLConnection) url.openConnection();

066  

067            if(httpconn.getResponseCode() == HttpURLConnection.HTTP_OK) {

068                Toast.makeText(getApplicationContext(),"连接Google Weather API成功!",

069                        Toast.LENGTH_SHORT).show();

070                // InputStreamReader

071                InputStreamReader isr =newInputStreamReader(httpconn.getInputStream(),"utf-8");

072                inti;

073                String content ="";

074                // read

075                while((i = isr.read()) != -1) {

076                    content = content + (char) i;

077                }

078                isr.close();

079                //设置TextView

080                tv.setText(content);

081            }

082            //disconnect

083            httpconn.disconnect();

084  

085        }catch(Exception e) {

086            Toast.makeText(getApplicationContext(),"连接Google Weather API失败", Toast.LENGTH_SHORT)

087                    .show();

088            e.printStackTrace();

089        }

090    }

091  

092    // 使用HttpCient连接GoogleWeatherAPI

093    protectedvoidhttpClientConn() {

094        //DefaultHttpClient

095        DefaultHttpClient httpclient =newDefaultHttpClient();

096        //HttpGet

097        HttpGet httpget =newHttpGet(googleWeatherUrl2);

098        //ResponseHandler

099        ResponseHandler<STRING> responseHandler =newBasicResponseHandler();

100  

101        try{

102            String content = httpclient.execute(httpget, responseHandler);

103            Toast.makeText(getApplicationContext(),"连接Google Weather API成功!",

104                    Toast.LENGTH_SHORT).show();

105            //设置TextView

106            tv.setText(content);

107        }catch(Exception e) {

108            Toast.makeText(getApplicationContext(),"连接Google Weather API失败", Toast.LENGTH_SHORT)

109            .show();

110            e.printStackTrace();

111        }

112        httpclient.getConnectionManager().shutdown();

113    }

114}</STRING>

4、最后别忘了在AndroidManifest.xml中加入访问网络的权限，<uses-permission android:name="android.permission.INTERNET"></uses-permission>

 

 

深入了解

http://topmanopensource.iteye.com/blog/821964