Android Bitmap，Drawable， byte[]转化

Bitmap  --  Drawable

1:
BitmapDrawable bd= new BitmapDrawable(bitmap)

Bitmap  --  byte[]

1:
	private byte[] bitmap2Bytes(Bitmap bitmap) {
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		bitmap.compress(Bitmap.CompressFormat.PNG, 100, baos);
		return baos.toByteArray();
	}

Drawable  --  Bitmap

1:
Bitmap bitmap = ((BitmapDrawable) getResources().getDrawable(R.drawable.icon)).getBitmap();
2:
	private Bitmap drawable2Bitmap(Drawable 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);
		drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
		drawable.draw(canvas);
		return bitmap;
	}

byte[]  --  Bitmap

1:
	public Bitmap bytes2Bimap(byte[] bytes) {
		if (bytes.length != 0) {
			return BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
		} else {
			return null;
		}
	}