Android 缩放bitmap的函数

//放大缩小图片

public static Bitmap zoomBitmap(Bitmap bitmap,int w,int h) {
		int width = bitmap.getWidth();
		int height = bitmap.getHeight();
		Matrix matrix = new Matrix();
		float scaleWidht = ((float)w / width);
		float scaleHeight = ((float)h / height);
		matrix.postScale(scaleWidht, scaleHeight);
		Bitmap newbmp = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);
		return newbmp;
	}