Android 网络图片查看器与网页源码查看器

在AndroidManifest.xml里面先添加访问网络的权限：

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

效果图如下：

下面是主要代码：

 package com.hb.neting;
 
 import java.io.InputStream;
 import java.net.HttpURLConnection;
 import java.net.URL;
 
 import android.annotation.SuppressLint;
 import android.app.Activity;
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
 import android.os.Bundle;
 import android.text.TextUtils;
 import android.view.View;
 import android.widget.EditText;
 import android.widget.ImageView;
 import android.widget.Toast;
 
 public class MainActivity extends Activity {
     private ImageView iv_show;
     private EditText et_input;
     private String path;
     private int code;
     private HttpURLConnection conn;
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         iv_show=(ImageView) findViewById(R.id.iv_show);
         et_input=(EditText) findViewById(R.id.et_inpput);
     }
     @SuppressLint("ShowToast") public void chakan(View view){
         path = et_input.getText().toString().trim();
         if (TextUtils.isEmpty(path)) {
             Toast.makeText(MainActivity.this, "不能输入空的", 0).show();
             return;
         }
         new Thread(){
             public void run() {
                 try {
                     URL url = new URL(path);
                     conn = (HttpURLConnection) url.openConnection();
                     conn.setRequestMethod("GET");
                     conn.setConnectTimeout(5000);
                     code = conn.getResponseCode();
                     if(code==200){
                         InputStream in = conn.getInputStream();
                         //解析图片
                         final Bitmap stream = BitmapFactory.decodeStream(in);
                         runOnUiThread(new  Runnable() {
                             public void run() {
                                 //更新UI
                                 iv_show.setImageBitmap(stream);
                             }
                         });
                         in.close();
                     }
                 } catch (Exception e) {
                     e.printStackTrace();
                 }
             };
         }.start();
     }
 }

这是xml的布局：

 <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" >
 
     <EditText
         android:id="@+id/et_inpput"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:hint="请输入获取图片的地址：" />
     <Button
         android:id="@+id/bt_read"
         android:onClick="chakan"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:text="查看"
         />
     <ImageView
         android:id="@+id/iv_show"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         />
 </LinearLayout>

源码：http://pan.baidu.com/s/1bUgMgY

接着看一下网页源码查看器的小案例：

　　既然都涉及到网络的添加一个如上的网络权限是必不可少的了，具体操做如上所示，先看效果图：

主要代码：

 package com.hb.network;
 
 import java.io.InputStream;
 import java.net.HttpURLConnection;
 import java.net.URL;
 
 import android.annotation.SuppressLint;
 import android.app.Activity;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.Message;
 import android.text.TextUtils;
 import android.view.View;
 import android.widget.EditText;
 import android.widget.TextView;
 import android.widget.Toast;
 
 import com.hb.utils.ReadStreamUtils;
 
 public class MainActivity extends Activity {
     protected static final int SUCESS = 0;
     protected static final int EORR = 1;
     private TextView tv_show;
     private EditText et_input;
     private URL url;
     private String path;
     @SuppressLint("HandlerLeak")
     private Handler handler=new Handler(){
         public void handleMessage(android.os.Message msg) {
             switch (msg.what) {
             case SUCESS:
                 String content=(String) msg.obj;
                 tv_show.setText(content);
                 break;
 
             case EORR:
                 Toast.makeText(MainActivity.this,"查看源码失败" , 0).show();
                 break;
             }
         };
     };
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         tv_show=(TextView) findViewById(R.id.tv_show);
         et_input=(EditText) findViewById(R.id.et_input);
 
     }
     public void onclick(View view){
         path = et_input.getText().toString().trim();
         if(TextUtils.isEmpty(path)){
             return;
         }new Thread(){
             public void run() {
                 try {
                     url = new URL(path);
                     //判断从EditText获取的数据否为空
                     if(TextUtils.isEmpty(path)){
                         return;
                     }
                     HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                     conn.setConnectTimeout(3000);
                     conn.setRequestMethod("GET");
                     int code = conn.getResponseCode();
                     if(code == 200){
                         InputStream is= conn.getInputStream();
                         String content = ReadStreamUtils.Read(is);
                         Message msg = new Message();
                         msg.what=SUCESS;
                         msg.obj=content;
                         handler.sendMessage(msg);
                     }
                 } catch (Exception e) {
                     e.printStackTrace();
                     Message msg = new Message();
                     msg.what=EORR;
                     handler.sendMessage(msg);
                 }
             };
         }.start();
 
     }
 }

 package com.hb.utils;
 
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 
 public class ReadStreamUtils {
 /**
  * 读取流的输入
  * @param is
  * @return
  * @throws IOException
  */
     public static String Read(InputStream is) throws IOException{
         ByteArrayOutputStream bos = new ByteArrayOutputStream();
         int len;
         byte [] buffer=new byte[1024];
         while((len=is.read(buffer))!=-1){
             bos.write(buffer,0,len);
         }
         is.close();
         bos.close();
         String temp = bos.toString();
         if(temp.contains("charset=utf-8")){
             return bos.toString("utf-8");
         }else if(temp.contains("charset=iso-8859-1")){
             return bos.toString("iso-8859-1");
         }
         return null;
 
     }
 
 }

及xml布局:

 <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="${relativePackage}.${activityClass}" >
 
     <EditText
         android:id="@+id/et_input"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:hint="请输入要查看源码的网址：" />
 
     <Button
         android:onClick="onclick"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:text="查看"
         android:textSize="25sp" />
 
     <ScrollView
         android:layout_width="match_parent"
         android:layout_height="match_parent" >
 
         <TextView
             android:id="@+id/tv_show"
             android:layout_width="match_parent"
             android:layout_height="match_parent" />
     </ScrollView>
 
 </LinearLayout>

　　源码：http://pan.baidu.com/s/1bUgMgY

　　　　　http://pan.baidu.com/s/1i46RQqL