Android显示网络图片

main.xml:

<?xml version="1.0" encoding="utf-8"?><LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical"android:layout_width="fill_parent"android:layout_height="fill_parent"android:gravity="center"><ImageViewandroid:id="@+id/img"android:layout_width="wrap_content"android:layout_height="wrap_content"/></LinearLayout>

MyWebDemo.java:

import java.io.ByteArrayOutputStream;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.URL;import android.app.Activity;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.Bundle;import android.widget.ImageView;public class MyWebDemo extends Activity {private static final String PATH = "http://image2.sina.com.cn/pfp/ask/images/zhishi/logo_zhishi.gif"; private ImageView img = null ;// 定义图片显示@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);super.setContentView(R.layout.main);// 调用布局管理器this.img = (ImageView) super.findViewById(R.id.img) ;// 取得组件try {byte data [] = this.getUrlData() ;// 接收数据Bitmap bm = BitmapFactory.decodeByteArray(data, 0, data.length);// 生成图形 this.img.setImageBitmap(bm) ;// 显示图片} catch (Exception e) {e.printStackTrace();}}public byte[] getUrlData() throws Exception {// 取得网络图片数据ByteArrayOutputStream bos = null ;// 内存输出流try {URL url = new URL(PATH) ;// 定义URLbos = new ByteArrayOutputStream() ;// 定义内存输出流byte data [] = new byte[1024] ;// 每次读取1024HttpURLConnection conn = (HttpURLConnection) url.openConnection();// 打开连接InputStream input = conn.getInputStream() ;// 取得输入流int len = 0 ;// 接收读取长度while((len = input.read(data)) != -1) {// 没有读取到底部bos.write(data, 0, len) ;// 向内存中保存}return bos.toByteArray() ;// 变为字节数组返回} catch (Exception e) {throw e ;} finally { if (bos != null) {bos.close();// 关闭输出流}}}}

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