大图、小图缩放避免模糊的较好方式

最新推荐文章于 2021-12-31 15:39:29 发布

原创最新推荐文章于 2021-12-31 15:39:29 发布 · 1.2k 阅读

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本文详细介绍了如何使用staticDrawablezoomDrawable和drawableToBitmap函数，优化Drawable组件的缩放和转换过程，包括获取组件的内在宽度和高度，将Drawable转换为Bitmap，并应用缩放矩阵进行比例调整。

记录积累知识

static Drawable zoomDrawable(Drawable drawable, int w, int h)
{
int width = drawable.getIntrinsicWidth();
int height= drawable.getIntrinsicHeight();
Bitmap oldbmp = drawableToBitmap(drawable);
Matrix matrix = new Matrix();
float scaleWidth = ((float)w / width);
float scaleHeight = ((float)h / height);
matrix.postScale(scaleWidth, scaleHeight);
Bitmap newbmp = Bitmap.createBitmap(oldbmp, 0, 0, width, height, matrix, true);
return new BitmapDrawable(newbmp);
}

static Bitmap drawableToBitmap(Drawable drawable)
{
int width = drawable.getIntrinsicWidth();
int height = drawable.getIntrinsicHeight();
Bitmap.Config config = drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888:Bitmap.Config.RGB_565;
Bitmap bitmap = Bitmap.createBitmap(width, height, config);
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, width, height);
drawable.draw(canvas);
return bitmap;
}