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http://www.eoeandroid.com/viewthread.php?tid=26&extra=page%3D2

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在android 当中显示一张网络图片的时候，其实是比较麻烦的。首先得把这个网络图片转换成java的imputstream流，然后再把这个留转换成一个bitMap.
bitMap是可以作为参数传给imageView的。

在下边的returnBitMap函数是最核心的，也是大家可以重用的，它负责把一个url的网络图片变成一个本地的BitMap。

1. package com.jinyan.image;
3. import java.io.IOException;
4. import java.io.InputStream;
5. import java.net.HttpURLConnection;
6. import java.net.MalformedURLException;
7. import java.net.URL;
9. import android.app .Activity;
10. import android.graphics.Bitmap;
11. import android.graphics.BitmapFactory;
12. import android.os.Bundle;
13. import android.util.Log;
14. import android.view.View;
15. import android.view.View.OnClickListener;
16. import android.widget.Button;
17. import android.widget.ImageView;
19. public class ActivityMain extends Activity {
20. /** Called when the activity is first created. */
22. String imageUrl = "http://i.pbase.com/o6/92/229792/1/80199697.uAs58yHk.50pxCross_of_the_Knights_Templar_svg.png";
23. Bitmap bmImg;
24. ImageView imView;
26. Button button1;
28. @Override
29. public void onCreate(Bundle savedInstanceState) {
30. super.onCreate(savedInstanceState);
31. setContentView(R.layout.main);
32. imView = (ImageView) findViewById(R.id.imview);
33. imView.setImageBitmap(returnBitMap(imageUrl));
36. }
38. public Bitmap returnBitMap(String url) {
39. URL myFileUrl = null;
40. Bitmap bitmap = null;
41. try {
42. myFileUrl = new URL(url);
43. } catch (MalformedURLException e) {
44. e.printStackTrace();
45. }
46. try {
47. HttpURLConnection conn = (HttpURLConnection) myFileUrl
48. .openConnection();
49. conn.setDoInput(true);
50. conn.connect();
51. InputStream is = conn.getInputStream();
52. bitmap = BitmapFactory.decodeStream(is);
53. is.close();
54. } catch (IOException e) {
55. e.printStackTrace();
56. }
57. return bitmap;
58. }
60. }

1. xml version="1.0" encoding="utf-8"?>
2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
3. android:orientation="vertical" android:layout_width="fill_parent"
4. android:layout_height="fill_parent">
5. <ImageView android:id="@+id/imview" android:layout_width="wrap_content"
6. android:layout_height="wrap_content" android:layout_gravity="center" />
7. LinearLayout>

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