10_Access the network through HttpUrlConnection in Android, use Handler and multi-threading, read network html code and display it on the interface, use of ScrollView component_html/css_WEB-ITnose

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1. 编写如下项目：

2 编写Android清单文件

    package="com.itheima28.htmldemo"

    android:versionCode="1"

    android:versionName="1.0" >

 

   

        android:minSdkVersion="8"

        android:targetSdkVersion="19" />

   

 

   

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

       

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

            android:label="@string/app_name" >

           

               

 

               

           

       

   

 

    package="com.itheima28.htmldemo"     android:versionCode="1"     android:versionName="1.0" >               android:minSdkVersion="8"         android:targetSdkVersion="19" />                   android:allowBackup="true"         android:icon="@drawable/ic_launcher"         android:label="@string/app_name"         android:theme="@style/AppTheme" >                     android:name="com.itheima28.htmldemo.MainActivity"             android:label="@string/app_name" >                                                                        

3 编写布局文件activity_main.xml

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical"

    tools:context=".MainActivity" >

   

   

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:orientation="horizontal">

       

       

            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"/>

       

       

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:onClick="getHtml"

            android:text="GO"/>

   

 

   

        android:layout_width="fill_parent"

        android:layout_height="fill_parent">

      

       

            android:id="@ id/tv_html"

            android:layout_width="fill_parent"

            android:layout_height="fill_parent"/>

   

   

    xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:orientation="vertical"     tools:context=".MainActivity" >                 android:layout_width="fill_parent"         android:layout_height="wrap_content"         android:orientation="horizontal">                             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"/>                             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:onClick="getHtml"             android:text="GO"/>                   android:layout_width="fill_parent"         android:layout_height="fill_parent">                            android:id="@ id/tv_html"             android:layout_width="fill_parent"             android:layout_height="fill_parent"/>        

4 编写Activity的类MainActivity如下：

package com.itheima28.htmldemo;

 

import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.net.HttpURLConnection;

import java.net.URL;

 

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;

 

public class MainActivity extends Activity {

 

    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() {

 

       @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, "访问失败", 0).show();

              break;

           default:

              break;

           }

       }

      

    };

 

    @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);

      

    }

 

    public void getHtml(View v) {

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

      

       new Thread(new Runnable() {

          

           @Override

           public void run() {

              // 请求网络

              String html = getHtmlFromInternet(url);

             

              if(!TextUtils.isEmpty(html)) {

                  // 更新textview的显示了

                  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();

    }

 

    /**

* Access the network based on the given url and grab the html code

* @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, "访问失败: " responseCode);

           }

       } catch (Exception e) {

           e.printStackTrace();

       }

       return null;

    }

   

    /**

* Return a string information according to the stream

* @param is

* @return

* @throws IOException

*/

    private String getStringFromInputStream(InputStream is) throws IOException {

       ByteArrayOutputStream baos = new ByteArrayOutputStream();

       byte[] buffer = new byte[1024];

       int len = -1;

      

                                                                                                                                                                           } is.close();

: utf-8

                                                                                                                                             .contains("gb2312")

|| html.contains("GBK") || html.contains("GB2312")) { // If it contains gbk, gb2312 encoding, use gbk encoding for comparison String encoding

charset = "gbk";

}

html

new

String(baos.toByteArray() , charset); // Encode the encoding name after using the original byte array

baos.close();    

return

html;

}

}

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