Android显示在线图片

转自：http://blog.csdn.net/ameyume/article/details/6106286

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1. import java.io.ByteArrayOutputStream;  
2. import java.io.InputStream;  
3. import java.net.HttpURLConnection;  
4. import java.net.URL;  
5.   
6. import android.app.Activity;  
7. import android.graphics.Bitmap;  
8. import android.graphics.BitmapFactory;  
9. import android.os.Bundle;  
10. import android.view.View;  
11. import android.widget.Button;  
12. import android.widget.EditText;  
13. import android.widget.ImageView;  
14. import android.widget.Toast;  
15.   
16. public class AndroidTest extends Activity {  
17.     private static final String URL = "http://avatar.csdn.net/3/2/4/2_ameyume.jpg";  
18.     private EditText pathText;  
19.     private ImageView imageView;  
20.   
21.     /** Called when the activity is first created. */  
22.     @Override  
23.     public void onCreate(Bundle savedInstanceState) {  
24.         super.onCreate(savedInstanceState);  
25.         setContentView(R.layout.main);  
26.           
27.         pathText = (EditText) this.findViewById(R.id.path);  
28.         pathText.setText(URL);  
29.         imageView = (ImageView) this.findViewById(R.id.imageView);  
30.         Button button = (Button) this.findViewById(R.id.button);  
31.         button.setOnClickListener(new View.OnClickListener() {  
32.               
33.             public void onClick(View v) {  
34.                 String path = pathText.getText().toString();  
35.                 try {  
36.                     byte[] data = getImage(path);  
37.                     if(data!=null){  
38.                         Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);// bitmap  
39.                         imageView.setImageBitmap(bitmap);// display image  
40.                     }else{  
41.                         Toast.makeText(AndroidTest.this, "Image error!", 1).show();  
42.                     }  
43.                 } catch (Exception e) {  
44.                     Toast.makeText(AndroidTest.this,"Newwork error!", 1).show();  
45.                     e.printStackTrace();  
46.                 }  
47.             }  
48.         });  
49.   
50.     }  
51.   
52.     /** 
53.      * Get image from newwork 
54.      * @param path The path of image 
55.      * @return 
56.      * @throws Exception 
57.      */  
58.     public static byte[] getImage(String path) throws Exception{  
59.         URL url = new URL(path);  
60.         HttpURLConnection conn = (HttpURLConnection) url.openConnection();  
61.         conn.setConnectTimeout(5 * 1000);  
62.         conn.setRequestMethod("GET");  
63.         InputStream inStream = conn.getInputStream();  
64.         if(conn.getResponseCode()==200){  
65.             return readStream(inStream);  
66.         }  
67.         return null;  
68.     }  
69.   
70.     /** 
71.      * Get data from stream 
72.      * @param inStream 
73.      * @return 
74.      * @throws Exception 
75.      */  
76.     public static byte[] readStream(InputStream inStream) throws Exception{  
77.         ByteArrayOutputStream outStream = new ByteArrayOutputStream();  
78.         byte[] buffer = new byte[1024];  
79.         int len = 0;  
80.         while( (len=inStream.read(buffer)) != -1){  
81.             outStream.write(buffer, 0, len);  
82.         }  
83.         outStream.close();  
84.         inStream.close();  
85.         return outStream.toByteArray();  
86.     }  
87.   
88. } 
    

manifest.xml中增加网络权限
 

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

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