Android实现网页图片浏览功能

本文实例为大家分享了andandroid实现网页图片浏览的具体代码，供大家参考，具体内容如下

基本功能：输入图片的url然后点击按钮加载出来图片

activity_main.xml

<?xml version="1.0" encoding="utf-8"?> 
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android" 
 xmlns:tools="http://schemas.android.com/tools" 
 android:id="@+id/activity_main" 
 android:layout_width="match_parent" 
 android:layout_height="match_parent" 
 android:orientation="vertical" 
 tools:context="cn.edu.bzu.imageview.mainactivity"> 

 <imageview 
  android:layout_width="fill_parent" 
  android:layout_height="fill_parent" 
  android:id="@+id/iv" 
  android:layout_weight="1000" 
  /> 
 <edittext 
  android:id="@+id/et_path" 
  android:layout_width="fill_parent" 
  android:layout_height="wrap_content" 
  android:hint="请输入图片的路径" 
  android:text="http://pic.58pic.com/58pic/16/62/63/97m58picywm_1024.jpg" 
  android:singleline="true" /> 
 <button 
  android:text="浏览" 
  android:layout_width="match_parent" 
  android:layout_height="wrap_content" 
  android:onclick="click"/> 
</linearlayout> 

mainactivity：

package cn.edu.bzu.imageview; 

import android.app.activity; 
import android.graphics.bitmap; 
import android.graphics.bitmapfactory; 
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.imageview; 
import android.widget.toast; 

import java.io.inputstream; 
import java.net.httpurlconnection; 
import java.net.malformedurlexception; 
import java.net.url; 

public class mainactivity extends activity { 
 protected static final int change_ui = 1; 
 protected static final int error = 2; 
 private edittext et_path; 
 private imageview iv; 
 private handler handler = new handler() { 
  public void handlemessage(message msg) { 
   if (msg.what == change_ui) { 
    bitmap bitmap = (bitmap) msg.obj; 
    iv.setimagebitmap(bitmap); 

   } else if (msg.what == error) { 
    toast.maketext(mainactivity.this, "显示图片错误",toast.length_short).show(); 
   } 
  } 

  ; 
 }; 

 @override 
 protected void oncreate(bundle savedinstancestate) { 
  super.oncreate(savedinstancestate); 
  setcontentview(r.layout.activity_main); 
  et_path = (edittext) findviewbyid(r.id.et_path); 
  iv = (imageview) findviewbyid(r.id.iv); 
 } 

 public void click(view view) { 
  final string path = et_path.gettext().tostring().trim(); 
  if (textutils.isempty(path)) { 
   toast.maketext(this, "图片路径不能为空", toast.length_short).show(); 
  } else { 
//子线程请求网络，android4.0以后访问网络不能放在主线程中 
   new thread() { 
    private httpurlconnection conn; 
    private bitmap bitmap; 

    public void run() {//连接服务器get请求，获取图片 
     //创建url对象 
     try { 
      url url = new url(path); 
      conn = (httpurlconnection) url.openconnection();//根据url发送http的请求 
      conn.setrequestmethod("get");//设置请求的方式 
      conn.setconnecttimeout(5000);//设置超时时间 
      conn.setrequestproperty("user-agent", "mozilla/4.0(compatible;msie 6.0;windows nt 5.1;" + "sv1;.net4.0c;.net4.0e;.net clr 2.0.50727;" + ".net clr 3.0.4506.2152;.net clr 3.5.30729;shuame)");//设置浏览器的版本 
      int code = conn.getresponsecode();//得到服务器返回的响应码 
      if (code == 200) {//请求成功后返回码是200 
       inputstream is = conn.getinputstream(); 
       bitmap = bitmapfactory.decodestream(is); 
       message msg = new message(); 
       msg.what = change_ui; 
       msg.obj = bitmap; 
       handler.sendmessage(msg); 
      } else { 
       message msg = new message(); 
       msg.what = error; 
       handler.sendmessage(msg); 
      } 

     } catch (java.io.ioexception e) { 
      e.printstacktrace(); 
      message msg = new message(); 
      msg.what = error; 
      handler.sendmessage(msg); 
     } 
    } 
   }.start(); 
  } 
 } 

 这样基本功能就能实现了。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。