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：

 1 package caicai.cn.netimag;
 2 
 3  import java.io.ByteArrayOutputStream;
 4  import java.io.InputStream;
 5  import java.net.HttpURLConnection;
 6  import java.net.URL;
 7 
 8  public class imageserver {
 9  public static byte[] getimage(String path) throws Exception{ //连接远程网址
10  URL url=new URL(path);
11  HttpURLConnection conn=(HttpURLConnection) url.openConnection();
12  conn.setConnectTimeout(5000);
13  conn.setRequestMethod("GET");
14  if(conn.getResponseCode()==200){
15  InputStream instream=conn.getInputStream();
16  return read(instream); 
17  }
18  return null;
19  }
20 
21  private static byte[] read(InputStream instream) throws Exception{ //  读取数据流，返回字节数据流
22  ByteArrayOutputStream outstream=new ByteArrayOutputStream(); 
23  byte[] buffer=new byte[1024];
24  while( (instream.read(buffer))!=-1){
25  outstream.write(buffer); 
26  } 
27  instream.close();
28  return outstream.toByteArray();
29  }
30  }

imageserver.java

 1 package caicai.cn.netimag;
 2 
 3  import android.app.Activity;
 4  import android.graphics.Bitmap;
 5  import android.graphics.BitmapFactory;
 6  import android.os.Bundle;
 7  import android.view.View;
 8  import android.widget.ImageView;
 9  import android.widget.Toast;
10 
11  public class NetimageActivity extends Activity {
12 
13  public ImageView imageview;
14  public void onCreate(Bundle savedInstanceState) {
15  super.onCreate(savedInstanceState);
16  setContentView(R.layout.main);
17  imageview=(ImageView) findViewById(R.id.imageview);
18  }
19  public void submit(View v){
20  String path="http://192.168.0.117/testxml/bottom.png";
21  try{
22    byte[] data=imageserver.getimage(path);
23    Bitmap bitmap=BitmapFactory.decodeByteArray(data, 0, data.length);   //生成图片工厂
24  imageview.setImageBitmap(bitmap);  //显示图片
25  }catch(Exception e){
26 
27  Toast.makeText(getApplicationContext(), "出错了", 1).show();
28  }
29  }
30  }

NetimageActivity.java

 1 <?xml version="1.0" encoding="utf-8"?>
 2  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3  android:layout_width="fill_parent"
 4  android:layout_height="fill_parent"
 5  android:orientation="vertical" >
 6 
 7  <Button 
 8  android:layout_width="fill_parent"
 9  android:layout_height="wrap_content"
10  android:text="获取网络图片"
11  android:onClick="submit"/>
12  <ImageView 
13  android:layout_width="fill_parent"
14  android:layout_height="wrap_content"
15  android:id="@+id/imageview"
16  android:src="@drawable/ic_launcher"
17  />
18 
19  </LinearLayout>

main.xml

 1 <?xml version="1.0" encoding="utf-8"?>
 2  <manifest xmlns:android="http://schemas.android.com/apk/res/android"
 3  package="caicai.cn.netimag"
 4  android:versionCode="1"
 5  android:versionName="1.0" >
 6 
 7  <uses-sdk android:minSdkVersion="8" />
 8  <uses-permission android:name="android.permission.INTERNET"/>
 9 
10  <application
11  android:icon="@drawable/ic_launcher"
12  android:label="@string/app_name" >
13  <activity
14  android:label="@string/app_name"
15  android:name=".NetimageActivity" >
16  <intent-filter >
17  <action android:name="android.intent.action.MAIN" />
18 
19  <category android:name="android.intent.category.LAUNCHER" />
20  </intent-filter>
21  </activity>
22  </application>
23 
24  </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;
	}