要使自己的Android程序进行http操作，就必须现在AndroidManifest.xml定义访问Internet的权限：
<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.ncs.hj" android:versionCode="1" android:versionName="1.0"> <uses-sdk android:minSdkVersion="8" /> <uses-permission android:name="android.permission.INTERNET"/> <application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name=".HttpTestActivity" android:label="@string/app_name"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application></manifest>
下面是布局文件，layout/main.xml
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_height="wrap_content" android:layout_width="match_parent"><TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" /><Button android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="TEST" android:id="@+id/btn"/></LinearLayout>
下面是Activity的代码：
package com.ncs.hj;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.client.ClientProtocolException;import org.apache.http.client.HttpClient;import org.apache.http.client.methods.HttpGet;import org.apache.http.impl.client.DefaultHttpClient;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class HttpTestActivity extends Activity { /** Called when the activity is first created. */ Button btn =null; HttpResponse httpResponse = null; HttpEntity httpEntity = null; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); btn = (Button)findViewById(R.id.btn); btn.setOnClickListener(new HttpTest()); } class HttpTest implements OnClickListener { @Override public void onClick(View v) { // TODO Auto-generated method stub HttpGet httpGet = new HttpGet("http://www.google.com"); HttpClient httpClient = new DefaultHttpClient(); InputStream inputStream = null; try { httpResponse = httpClient.execute(httpGet); httpEntity = httpResponse.getEntity(); inputStream = httpEntity.getContent(); BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream)); String result = ""; String line =""; while((line = reader.readLine()) != null) { result = result +line; } System.out.println(result); } catch (ClientProtocolException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } finally { try { inputStream.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } }}