<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

??? package="com.itheima28.htmldemo"

??? android:versionCode="1"

??? android:versionName="1.0" >

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??? <uses-sdk

??????? android:minSdkVersion="8"

??????? android:targetSdkVersion="19" />

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

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??? <application

??????? android:allowBackup="true"

??????? android:icon="@drawable/ic_launcher"

??????? android:label="@string/app_name"

??????? android:theme="@style/AppTheme" >

??????? <activity

??????????? android:name="com.itheima28.htmldemo.MainActivity"

??????????? android:label="@string/app_name" >

??????????? <intent-filter>

??????????????? <action android:name="android.intent.action.MAIN" />

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??????????????? <category android:name="android.intent.category.LAUNCHER" />

??????????? </intent-filter>

??????? </activity>

??? </application>

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</manifest>

<LinearLayout 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:orientation="vertical"

??? tools:context=".MainActivity" >

???

??? <LinearLayout

??????? android:layout_width="fill_parent"

??????? android:layout_height="wrap_content"

??????? android:orientation="horizontal">

???????

??????? <EditText

??????????? android:id="@+id/et_url"

??????????? android:layout_width="0dip"

??????????? android:text="http://www.baidu.com"

??????????? android:layout_height="wrap_content"

??????????? android:singleLine="true"

??????????? android:layout_weight="1"/>

???????

??????? <Button

??????????? android:layout_width="wrap_content"

??????????? android:layout_height="wrap_content"

??????????? android:onClick="getHtml"

??????????? android:text="GO"/>

??? </LinearLayout>

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??? <ScrollView

??????? android:layout_width="fill_parent"

??????? android:layout_height="fill_parent">

??????

??????? <TextView

??????????? android:id="@+id/tv_html"

??????????? android:layout_width="fill_parent"

??????????? android:layout_height="fill_parent"/>

??? </ScrollView>

???

</LinearLayout>

package com.itheima28.htmldemo;

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import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.net.HttpURLConnection;

import java.net.URL;

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import android.app.Activity;

import android.os.Bundle;

import android.os.Handler;

import android.os.Message;

import android.text.TextUtils;

import android.util.Log;

import android.view.View;

import android.widget.EditText;

import android.widget.TextView;

import android.widget.Toast;

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public class MainActivity extends Activity {

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??? private static final String TAG = "MainActivity";

??? private static final int SUCCESS = 0;

??? protected static final int ERROR = 1;

??? private EditText etUrl;

??? private TextView tvHtml;

???

??? private Handler handler = new Handler() {

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?????? @Override

?????? public void handleMessage(Message msg) {

?????????? super.handleMessage(msg);

?????????? switch (msg.what) {

?????????? case SUCCESS:

????????????? ?tvHtml.setText((String) msg.obj);

????????????? break;

?????????? case ERROR:

????????????? Toast.makeText(MainActivity.this, "訪問失敗", 0).show();

????????????? break;

?????????? default:

????????????? break;

?????????? }

?????? }

??????

??? };

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??? @Override

??? protected void onCreate(Bundle savedInstanceState) {

?????? super.onCreate(savedInstanceState);

?????? setContentView(R.layout.activity_main);

??????

?????? etUrl = (EditText) findViewById(R.id.et_url);

?????? tvHtml = (TextView) findViewById(R.id.tv_html);

??????

??? }

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??? public void getHtml(View v) {

?????? final String url = etUrl.getText().toString();

??????

?????? new Thread(new Runnable() {

??????????

?????????? @Override

?????????? public void run() {

????????????? // 請求網(wǎng)絡

????????????? String html = getHtmlFromInternet(url);

?????????????

????????????? if(!TextUtils.isEmpty(html)) {

????????????????? // 更新textview的顯示了

????????????????? Message msg = new Message();

????????????????? msg.what = SUCCESS;

????????????????? msg.obj = html;

????????????????? handler.sendMessage(msg);

????????????? } else {

????????????????? Message msg = new Message();

????????????????? msg.what = ERROR;

????????????????? handler.sendMessage(msg);

????????????? }

?????????? }

?????? }).start();

??? }

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??? /**

??? ?* 根據(jù)給定的url訪問網(wǎng)絡, 抓去html代碼

??? ?* @param url

??? ?* @return

??? ?*/

??? protected String getHtmlFromInternet(String url) {

??????

?????? try {

?????????? URL mURL = new URL(url);

?????????? HttpURLConnection conn = (HttpURLConnection) mURL.openConnection();

??????????

?????????? conn.setRequestMethod("GET");

?????????? conn.setConnectTimeout(10000);

?????????? conn.setReadTimeout(5000);

??????????

//???????? conn.connect();

??????????

?????????? int responseCode = conn.getResponseCode();

??????????

?????????? if(responseCode == 200) {

????????????? InputStream is = conn.getInputStream();

????????????? String html = getStringFromInputStream(is);

????????????? return html;

?????????? } else {

????????????? Log.i(TAG, "訪問失敗: " + responseCode);

?????????? }

?????? } catch (Exception e) {

?????????? e.printStackTrace();

?????? }

?????? return null;

??? }

???

??? /**

??? ?* 根據(jù)流返回一個字符串信息

??? ?* @param is

??? ?* @return

??? ?* @throws IOException

??? ?*/

??? private String getStringFromInputStream(InputStream is) throws IOException {

?????? ByteArrayOutputStream baos = new ByteArrayOutputStream();

?????? byte[] buffer = new byte[1024];

?????? int len = -1;

??????

?????? while((len = is.read(buffer)) != -1) {

?????????? baos.write(buffer, 0, len);

?????? }

?????? is.close();

??????

?????? String html = baos.toString();? // 把流中的數(shù)據(jù)轉(zhuǎn)換成字符串, 采用的編碼是: utf-8

??????

?????? String charset = "utf-8";

?????? if(html.contains("gbk") || html.contains("gb2312")

????????????? || html.contains("GBK") || html.contains("GB2312")) {?????? // 如果包含gbk, gb2312編碼, 就采用gbk編碼進行對字符串編碼

?????????? charset = "gbk";

?????? }

??????

?????? html = new String(baos.toByteArray(), charset);? // 對原有的字節(jié)數(shù)組進行使用處理后的編碼名稱進行編碼

?????? baos.close();

?????? return html;

??? }

}