Android 圖像系列: 將本地圖片加載到Drawable

Android 圖像系列: 將本地圖片加載到Drawable

1. /**
2. * 將文件生成位圖
3. * @param path
4. * @return
5. * @throws IOException
6. */
7. public BitmapDrawable getImageDrawable(String path)
8. throws IOException
9. {
10. //打開文件
11. File file = new File(path);
12. if(!file.exists())
13. {
14. return null;
15. }
17. ByteArrayOutputStream outStream = new ByteArrayOutputStream();
18. byte[] bt = new byte[BUFFER_SIZE];
20. //得到文件的輸入流
21. InputStream in = new FileInputStream(file);
23. //將文件讀出到輸出流中
24. int readLength = in.read(bt);
25. while (readLength != -1) {
26. outStream.write(bt, 0, readLength);
27. readLength = in.read(bt);
28. }
30. //轉換成byte 後 再格式化成位圖
31. byte[] data = outStream.toByteArray();
32. Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);// 生成位圖
33. BitmapDrawable bd = new BitmapDrawable(bitmap);
35. return bd;
36. }