Android互联网访问图片并在客户端显示的方法

<relativelayout 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:paddingbottom="@dimen/activity_vertical_margin"
 android:paddingleft="@dimen/activity_horizontal_margin"
 android:paddingright="@dimen/activity_horizontal_margin"
 android:paddingtop="@dimen/activity_vertical_margin"
 tools:context=".mainactivity" >
 <edittext
  android:id="@+id/url_text"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_alignparentleft="true"
  android:layout_alignparentright="true"
  android:layout_alignparenttop="true"
  android:ems="10"
  android:inputtype="textpostaladdress"
  android:text="@string/url_text" >
  <requestfocus />
 </edittext>
 <button
  android:id="@+id/btn_text"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_alignleft="@+id/url_text"
  android:layout_below="@+id/url_text"
  android:layout_margintop="32dp"
  android:onclick="sendhttp"
  android:text="@string/btn_text" />
 <imageview
  android:id="@+id/iv_ie"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_alignparentbottom="true"
  android:layout_alignparentleft="true"
  android:layout_alignright="@+id/url_text"
  android:layout_below="@+id/btn_text"
  android:src="@drawable/ic_launcher" />
</relativelayout>

package com.example.lession08_code.utis;
import java.io.inputstream;
import java.net.httpurlconnection;
import java.net.url;
import android.graphics.bitmap;
import android.graphics.bitmapfactory;
public class httputils {
 public static string sendget(string path){
  string content=null;
  try{
   //设置访问的url
   url url=new url(path);
   //打开请求
   httpurlconnection httpurlconnection=(httpurlconnection) url.openconnection();
   //设置请求的信息
   httpurlconnection.setrequestmethod("get");
   //设置请求是否超时
   httpurlconnection.setconnecttimeout(5000);
   //判断服务器是否响应成功
   if(httpurlconnection.getresponsecode()==200){
    //获取响应的输入流对象
    inputstream is=httpurlconnection.getinputstream();
    byte data[]=streamtools.istodata(is);
    //把转换成字符串
    content=new string(data);
    //内容编码方式
    if(content.contains("gb2312")){
     content=new string(data,"gb2312");
    }
   }
   //断开连接
   httpurlconnection.disconnect();
  }catch(exception e){
   e.printstacktrace();
  }
  return content;
 }
 public static bitmap sendgets(string path){
  bitmap bitmap=null;
  try{
   //设置访问的url
   url url=new url(path);
   //打开请求
   httpurlconnection httpurlconnection=(httpurlconnection) url.openconnection();
   //设置请求的信息
   httpurlconnection.setrequestmethod("get");
   //设置请求是否超时
   httpurlconnection.setconnecttimeout(5000);
   //判断服务器是否响应成功
   if(httpurlconnection.getresponsecode()==200){
    //获取响应的输入流对象
    inputstream is=httpurlconnection.getinputstream();
    //直接把is的流转换成bitmap对象
    bitmap=bitmapfactory.decodestream(is);
   }
   //断开连接
   httpurlconnection.disconnect();
  }catch(exception e){
   e.printstacktrace();
  }
  return bitmap;
 }
}

package com.example.lession08_code.utis;
import android.app.alertdialog;
import android.content.componentname;
import android.content.context;
import android.content.dialoginterface;
import android.content.intent;
import android.net.connectivitymanager;
import android.net.networkinfo;
import android.widget.toast;
public class networkutils {
 private context context;
 // 网路链接管理对象
 public connectivitymanager connectivitymanager;
 public networkutils(context context) {
  this.context = context;
  // 获取网络链接的对象
  connectivitymanager = (connectivitymanager) context
    .getsystemservice(context.connectivity_service);
 }
 public boolean setactivenetwork() {
  boolean flag=false;
  // 获取可用的网络链接对象
  networkinfo networkinfo = connectivitymanager.getactivenetworkinfo();
  if (networkinfo == null) {
   new alertdialog.builder(context)
     .settitle("网络不可用")
     .setmessage("可以设置网络?")
     .setpositivebutton("确认",
       new dialoginterface.onclicklistener() {
        @override
        public void onclick(dialoginterface dialog,
          int which) {
         toast.maketext(context, "点击确认",
           toast.length_long).show();
         // 声明意图
         intent intent = new intent();
         intent.setaction(intent.action_main);
         intent.addcategory("android.intent.category.launcher");
         intent.setcomponent(new componentname(
           "com.android.settings",
           "com.android.settings.settings"));
         intent.setflags(0x10200000);
         // 执行意图
         context.startactivity(intent);
        }
       })
     .setnegativebutton("取消",
       new dialoginterface.onclicklistener() {
        @override
        public void onclick(dialoginterface dialog,
          int which) {
        }
       }).show();// 必须.show();
  }
  if(networkinfo!=null){
   flag=true;
  }
  return flag;
 }
}

package com.example.lession08_code.utis;
import java.io.bytearrayoutputstream;
import java.io.ioexception;
import java.io.inputstream;
public class streamtools {
 public static byte[] istodata(inputstream is) throws ioexception{
  //字节输出流
  bytearrayoutputstream bops=new bytearrayoutputstream();
  //读取数据的缓冲区
  byte buffer[]=new byte[1024];
  //读取记录的长度
  int len=0;
  while((len=is.read(buffer))!=-1){
   bops.write(buffer, 0, len);
  }
  //把读取的内容转换成byte数组
  byte data[]=bops.tobytearray();
  return data;
 }
}

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