Android 网络图片查看器与网页源码查看器

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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