Choose images in SD card and set it as wallpaper.

various preferences.
- 'overall' mode for avoiding unexpected image zoom.
- 'avoid status bar','avoid navigation bar' for just-fit image size to home screen.
- 'fullcolor loading' and 'dither output' for image quality and decrease byte size of wallpaper.

* restriction:
If you want to stop scroll wallpaper, please find home screen app that has the option.

* permission
SET_WALLPAPER for set wallpaper
READ_EXTERNAL_STORAGE for read image
WRITE_EXTERNAL_STORAGE for delete image

Recent changes:
1.34
! add permission: android.permission.WRITE_SETTINGS
seems WallpaperManager#clear() requires this permission in case of some devices.

1.33
! add permission: android.permission.WRITE_EXTERNAL_STORAGE

1.32
! add permission: android.permission.READ_EXTERNAL_STORAGE

1.30
+ "avoid navigation bar" for Android 4.0 (Ice cream sandwich)