在AndroidManifest.xml里面先添加权限访问网络的权限：

<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/1bp6EwyF

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/1bp6EwyF

http://pan.baidu.com/s/1c2H1JlI

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