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

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

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

baos.close();    

html;

}

}

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