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();
  }
  }

imageserver.java

 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();
  }
  }
  }

NetimageActivity.java

 <?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>

main.xml

 <?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>

AndroidManifest.xml

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;
	}