Conversion between drawable, bitmap, and byte)

Android will perform some type conversion when processing a write image resource. Now I have time to sort it out:

1. Simple Method of drawable → bitmap
(Bitmapdrawable) res. getdrawable (R. drawable. youricon). getbitmap ();

2. drawable → bitmap
Java Code
Public static bitmap drawabletobitmap (drawable ){

Bitmap bitmap = bitmap
. Createbitmap (
Drawable. getintrinsicwidth (),
Drawable. getintrinsicheight (),
Drawable. getopacity ()! = Pixelformat. opaque? Bitmap. config. argb_8888
: Bitmap. config. rgb_565 );
Canvas canvas = new canvas (Bitmap );
// Canvas. setbitmap (Bitmap );
Drawable. setbounds (0, 0, drawable. getintrinsicwidth (), drawable. getintrinsicheight ());
Drawable. Draw (canvas );
Return bitmap;
}

3. Simple Method of Bitmap → drawable
Bitmapdrawable = (bitmapdrawable) bitmap;
Drawable = (drawable) bitmapdrawable;


Bitmap bitmap = new Bitmap (...);
Drawable = new bitmapdrawable (Bitmap );

3. Obtain bitmap from the Resource
Java code
Resources res = getresources ();

Bitmap BMP = bitmapfactory. decoderesource (Res, R. drawable. PIC );

4. Bitmap → byte []
Java code
Private byte [] bitmap2bytes (Bitmap BM ){
Bytearrayoutputstream baos = new bytearrayoutputstream (); & nbsp;
BM. Compress (bitmap. compressformat. PNG, 100, baos); & nbsp;
Return baos. tobytearray ();
}

5. byte [] → bitmap
JAVA code
private bitmap bytes2bimap (byte [] B) {
If (B. length! = 0) {
return bitmapfactory. decodebytearray (B, 0, B. length);
}< br> else {
return NULL;
}< BR >}