android读取远程图片案例

关键代码：
Bitmap bitmap=BitmapFactory.decodeByteArray(data, 0, data.length);
imageview.setImageBitmap(bitmap);

注意访问网络权限：<uses-permission android:name="android.permission.INTERNET"/>

完整测试代码如下：

package caicai.cn.netimag;

 import java.io.ByteArrayOutputStream;
 import java.io.InputStream;
 import java.net.HttpURLConnection;
 import java.net.URL;

 public class imageserver {
 public static byte[] getimage(String path) throws Exception{ //连接远程网址
 URL url=new URL(path);
 HttpURLConnection conn=(HttpURLConnection) url.openConnection();
 conn.setConnectTimeout(5000);
 conn.setRequestMethod("GET");
 if(conn.getResponseCode()==200){
 InputStream instream=conn.getInputStream();
 return read(instream); 
 }
 return null;
 }

 private static byte[] read(InputStream instream) throws Exception{ //  读取数据流，返回字节数据流
 ByteArrayOutputStream outstream=new ByteArrayOutputStream(); 
 byte[] buffer=new byte[1024];
 while( (instream.read(buffer))!=-1){
 outstream.write(buffer); 
 } 
 instream.close();
 return outstream.toByteArray();
 }
 }

package caicai.cn.netimag;

 import android.app.Activity;
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
 import android.os.Bundle;
 import android.view.View;
 import android.widget.ImageView;
 import android.widget.Toast;

 public class NetimageActivity extends Activity {

 public ImageView imageview;
 public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.main);
 imageview=(ImageView) findViewById(R.id.imageview);
 }
 public void submit(View v){
 String path="http://192.168.0.117/testxml/bottom.png";
 try{
   byte[] data=imageserver.getimage(path);
   Bitmap bitmap=BitmapFactory.decodeByteArray(data, 0, data.length);   //生成图片工厂
 imageview.setImageBitmap(bitmap);  //显示图片
 }catch(Exception e){

 Toast.makeText(getApplicationContext(), "出错了", 1).show();
 }
 }
 }

<?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"
 android:orientation="vertical" >

 <Button 
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 android:text="获取网络图片"
 android:onClick="submit"/>
 <ImageView 
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 android:id="@+id/imageview"
 android:src="@drawable/ic_launcher"
 />

 </LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
 package="caicai.cn.netimag"
 android:versionCode="1"
 android:versionName="1.0" >

 <uses-sdk android:minSdkVersion="8" />
 <uses-permission android:name="android.permission.INTERNET"/>

 <application
 android:icon="@drawable/ic_launcher"
 android:label="@string/app_name" >
 <activity
 android:label="@string/app_name"
 android:name=".NetimageActivity" >
 <intent-filter >
 <action android:name="android.intent.action.MAIN" />

 <category android:name="android.intent.category.LAUNCHER" />
 </intent-filter>
 </activity>
 </application>

 </manifest>

 更新最新加载方法

	/**
	 * 根据一个网络连接(String)获取bitmap图像
	 * 
	 * @param imageUri
	 * @return
	 * @throws MalformedURLException
	 */
	public static Bitmap getbitmap(String imageUri) {
		// 显示网络上的图片
		Bitmap bitmap = null;
		try {
			URL myFileUrl = new URL(imageUri);
			HttpURLConnection conn = (HttpURLConnection) myFileUrl.openConnection();
			conn.setDoInput(true);
			conn.connect();
			InputStream is = conn.getInputStream();
			bitmap = BitmapFactory.decodeStream(is);
			is.close();
		} catch (IOException e) {
			e.printStackTrace();
			return null;
		}
		return bitmap;
	}