Android開發之獲取網絡數據

Android開發之獲取網絡數據

獲取網絡圖片

首先我們需要把界面搭建好

1. <?xml version="1.0" encoding="utf-8"?>
3. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
5. android:layout_width="fill_parent"
7. android:layout_height="fill_parent"
9. android:orientation="vertical" >
13. <Button
15. android:id="@+id/showImageID"
17. android:layout_width="wrap_content"
19. android:layout_height="wrap_content"
21. android:text="@string/btn" />
23. //用來點擊事件
27. <ImageView
29. android:id="@+id/imageViewID"
31. android:layout_width="wrap_content"
33. android:layout_height="wrap_content" />
35. //用來顯示圖片
39. </LinearLayout>

接下來我們需要添加ImageService類

1. package cn.class3g.service;
5. import java.io.ByteArrayOutputStream;
7. import java.io.InputStream;
9. import java.net.HttpURLConnection;
11. import java.net.URL;
15. public class ImageService {
17. public static byte[] getImageData(String path) throws Exception {
19. URL url = new URL(path);
23. HttpURLConnection conn = (HttpURLConnection) url.openConnection();
27. conn.setRequestMethod("GET");
31. conn.setConnectTimeout(5000);
35. InputStream inStream = conn.getInputStream();
39. ByteArrayOutputStream bos = new ByteArrayOutputStream();
43. byte[] buffer = new byte[1024];
45. int len = 0;
47. while ((len = inStream.read(buffer)) != -1) {
49. bos.write(buffer, 0, len);
51. }
55. byte[] data = bos.toByteArray();
59. return data;
63. }
65. }