查看htmlView

1、视图

 <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" >

     <EditText
         android:id="@+id/et_path"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:hint="请输入内容" />
     <Button
         android:onClick="viewSource"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:text="查看内容"
         />
     <ScrollView
         android:layout_width="fill_parent"
         android:layout_height="fill_parent"
         >
         <TextView
             android:layout_width="fill_parent"
             android:layout_height="fill_parent"
             android:id="@+id/tv_content"
             />
     </ScrollView>

 </LinearLayout>

2、权限

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

3、MainActivity

 package com.example.htmlview;

 import java.io.InputStream;
 import java.net.HttpURLConnection;
 import java.net.MalformedURLException;
 import java.net.URL;

 import com.example.htmlview.utils.StreamTools;

 import android.os.Bundle;
 import android.os.Handler;
 import android.os.Message;
 import android.app.Activity;
 import android.text.TextUtils;
 import android.view.Menu;
 import android.view.View;
 import android.widget.EditText;
 import android.widget.TextView;
 import android.widget.Toast;

 public class MainActivity extends Activity {

     private static final int VIEW_UI = 1;
     private static final int ERROR = 2;
     private TextView tv_content;
     private EditText et_path;
     private Handler handler = new Handler(){

         @Override
         public void handleMessage(android.os.Message msg) {
             // TODO Auto-generated method stub
             switch(msg.what){
             case ERROR:
                 Toast.makeText(MainActivity.this, "抛出异常", 0).show();
                 break;
             case VIEW_UI:
                 String str = (String)msg.obj;
                 tv_content.setText(str);
                 break;
             }
         }

     };
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);

         tv_content = (TextView)findViewById(R.id.tv_content);
         et_path = (EditText)findViewById(R.id.et_path);
     }

     public void viewSource(View view){
         final String path = et_path.getText().toString().trim();
         if(TextUtils.isEmpty(path)){
             Toast.makeText(this, "路径不能为空", 0).show();
         }else{
             new Thread(){
                 public void run(){
                     try {
                         URL url = new URL(path);
                         HttpURLConnection conn=(HttpURLConnection) url.openConnection();
                         conn.setRequestMethod("GET");
                         conn.setConnectTimeout(5000);
                         conn.setRequestProperty("User-Agent", "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)");
                         int code = conn.getResponseCode();
                         if(code == 200){
                             InputStream is = conn.getInputStream();
                             String result = StreamTools.readInputStream(is);
                             if(result != null){
                                 Message msg = new Message();
                                 msg.what = VIEW_UI;
                                 msg.obj = result;
                                 handler.sendMessage(msg);
                             }
                         }
                     } catch (Exception e) {
                         // TODO Auto-generated catch block
                         e.printStackTrace();
                         Message msg = new Message();
                         msg.what = ERROR;
                         handler.sendMessage(msg);

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

4、辅助类

 package com.example.htmlview.utils;

 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.InputStream;

 public class StreamTools {

     public static String readInputStream(InputStream is){
         try {
             ByteArrayOutputStream baos = new ByteArrayOutputStream();
             int len=0;
             byte[] buffer = new byte[1024];
             while((len = is.read(buffer)) != -1){
                 baos.write(buffer, 0, len);
             }
             baos.close();
             is.close();
             byte[] result = baos.toByteArray();
             return new String(result);
         } catch (Exception e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
             return null;
         }

     }
 }