问题描述
我如何能够确定/计算(与BitmapFactory解码之后)的位图的字节大小?我需要知道有多少内存空间占用,因为我在做内存缓存/管理我的应用程序。 (文件大小是不够的,因为这些是JPG / PNG文件)
How can I determine/calculate the byte size of a bitmap (after decoding with BitmapFactory)?I need to know how much memory space it occupies, because I'm doing memory caching/management in my app. (file size is not enough, since these are jpg/png files)
感谢您的解决方案!
更新:getRowBytes *的getHeight可能做的伎俩。我将实现这种方式,直到有人想出了一些反对
Update: getRowBytes * getHeight might do the trick.. I'll implement it this way until someone comes up with something against it.
推荐答案
getRowBytes()*的getHeight()
似乎是工作的罚款我。
getRowBytes() * getHeight()
seems to be working fine to me.
更新了我的〜2岁的答案:由于API级别12位图有一个直接的方式来查询的字节大小:http://developer.android.com/reference/android/graphics/Bitmap.html#getByteCount%28%29
Update to my ~2 year old answer:Since API level 12 Bitmap has a direct way to query the byte size:http://developer.android.com/reference/android/graphics/Bitmap.html#getByteCount%28%29
----样品code
----Sample code
@TargetApi(Build.VERSION_CODES.HONEYCOMB_MR1)
protected int sizeOf(Bitmap data) {
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB_MR1) {
return data.getRowBytes() * data.getHeight();
} else {
return data.getByteCount();
}
}
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