实现最简单的网络demo

网络编程的第一个基点:获取最简答的数据

HttpDemoMain.java 主体代码

package com.yht.test.http;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class HttpDemoMain extends Activity implements android.view.View.OnClickListener{
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

Button startUpHttp = (Button) findViewById(R.id.btn);
startUpHttp.setOnClickListener(this);
}

@Override
public void onClick(View v) {
try {
URL url = new URL("http://www.baidu.com");
HttpURLConnection urlConn = (HttpURLConnection) url.openConnection();
InputStreamReader in = new InputStreamReader(urlConn.getInputStream());
BufferedReader buffer = new BufferedReader(in);
String inputLine = null;
String resultData = null;
while((inputLine = buffer.readLine()) != null){
resultData += (inputLine + "\n");
}
System.out.println(resultData);
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}

}
}

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
<Button
android:id="@+id/btn"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="start http"
/>
</LinearLayout>

AndroidManifest.xml 添加网络权限

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.yht.test.http"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="8" />

<uses-permission android:name="android.permission.INTERNET"></uses-permission>

<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".HttpDemoMain"
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>