互联网访问图片，在android客户端显示

1、布局界面

<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>

2、封转的一些类

URL的封装：

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urlURL 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urlURL 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;}}

判断网络是否连接的封装类

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() {@Overridepublic 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() {@Overridepublic void onClick(DialogInterface dialog,int which) {}}).show();// 必须.show();}if(networkInfo!=null){flag=true;}return flag;}}

输出流的封装类

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;}}

注意：在这里还需要加权限问题

 

 <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>    <uses-permission android:name="android.permission.INTERNET"/>