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"/>