1、Drawable --> Bitmap

1. Bitmap drawable2Bitmap(Drawable drawable) {
2. if (drawable instanceof BitmapDrawable) {
3. return ((BitmapDrawable) drawable).getBitmap();
4. } else if (drawable instanceof NinePatchDrawable) {
5. Bitmap bitmap = Bitmap
6. .createBitmap(
7. drawable.getIntrinsicWidth(),
8. drawable.getIntrinsicHeight(),
9. drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
10. : Bitmap.Config.RGB_565);
11. Canvas canvas = new Canvas(bitmap);
12. drawable.setBounds(0, 0, drawable.getIntrinsicWidth(),
13. drawable.getIntrinsicHeight());
14. drawable.draw(canvas);
15. return bitmap;
16. } else {
17. return null;
18. }
19. }

2、從資源中獲取的Drawable --> Bitmap

1. Resources res = getResources();
2. Bitmap bmp = BitmapFactory.decodeResource(res, R.drawable.pic);

3、Bitmap --> Drawable

1. Drawable bitmap2Drawable(Bitmap bitmap) {
2. return new BitmapDrawable(bitmap);
3. }

4、Bitmap --> byte[]

1. byte[] Bitmap2Bytes(Bitmap bm) {
2. ByteArrayOutputStream baos = new ByteArrayOutputStream();
3. bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
4. return baos.toByteArray();
5. }

5、 byte[] --> Bitmap

1. Bitmap Bytes2Bimap(byte[] b) {
2. if (b.length != 0) {
3. return BitmapFactory.decodeByteArray(b, 0, b.length);
4. } else {
5. return null;
6. }
7. }

Android中 Bitmap和Drawable相互轉換的方法