Android bitmap byte [] drawable

Android will perform some type conversion when processing a write image resource. Now I have time to sort it out:
1. drawable → bitmap
Java code

1. Public static bitmap drawabletobitmap (drawable ){
3. Bitmap bitmap = bitmap
4. . Createbitmap (
5. Drawable. getintrinsicwidth (),
6. Drawable. getintrinsicheight (),
7. Drawable. getopacity ()! = Pixelformat. opaque? Bitmap. config. argb_8888
8. : Bitmap. config. rgb_565 );
9. Canvas canvas = new canvas (Bitmap );
10. // Canvas. setbitmap (Bitmap );
11. Drawable. setbounds (0, 0, drawable. getintrinsicwidth (), drawable. getintrinsicheight ());
12. Drawable. Draw (canvas );
13. Return bitmap;
14. }
15. 2. Obtain bitmap from a resource
16. Java code
18. Resources res = getresources ();
20. Bitmap BMP = bitmapfactory. decoderesource (Res, R. drawable. PIC );
21. 3. Bitmap → byte []
22. Java code
24. Private byte [] bitmap2bytes (Bitmap BM ){
25. Bytearrayoutputstream baos = new bytearrayoutputstream ();
26. BM. Compress (bitmap. compressformat. PNG, 100, baos );
27. Return baos. tobytearray ();
28. }
30. 4. byte [] → bitmap
32. Java code
34. Private bitmap bytes2bimap (byte [] B ){
35. If (B. length! = 0 ){
36. Return bitmapfactory. decodebytearray (B, 0, B. Length );
37. }
38. Else {
39. Return NULL;
40. }
41. }

Some activity styles:
• Android: theme = "@ Android: style/theme. Dialog" shows an activity as a dialog box
• Android: theme = "@ Android: style/theme. notitlebar" does not display the application title bar
• Android: theme = "@ Android: style/theme. notitlebar. fullscreen": The application title bar is not displayed and displayed in full screen.
• Android: theme = "@ Android: style/theme. Light" the background is white
• Android: theme = "@ Android: style/theme. Light. notitlebar" the white background does not have a title bar.
• Android: theme = "@ Android: style/theme. Light. notitlebar. fullscreen" white background, no title bar, full screen
• Android: theme = "@ Android: style/theme. Black" background black
• Android: theme = "@ Android: style/theme. Black. notitlebar" the black background does not have a title bar.
• Android: theme = "@ Android: style/theme. Black. notitlebar. fullscreen" black background, no title bar, full screen
• Android: theme = "@ Android: style/theme. Wallpaper" uses the system desktop as the background of the application
• Android: theme = "@ Android: style/theme. wallpaper. notitlebar" uses the system desktop as the background of the application without a title bar.
• Android: theme = "@ Android: style/theme. wallpaper. notitlebar. fullscreen" uses the system desktop as the background of the application, with no title bar and full screen
• Android: theme = "@ Android: style/translucent" Translucent Effect
• Android: theme = "@ Android: style/theme. translucent. notitlebar" translucent and no title bar
• Android: theme = "@ Android: style/theme. translucent. notitlebar. fullscreen" Translucent effect, no title bar, full screen
• Android: theme = "@ Android: style/theme. Panel"

• Android: theme = "@ Android: style/theme. Light. Panel"

From: http://makeyouown.iteye.com/blog/1273319