CODEWITHSUNDEEP
androidbitmap
user289463
user289463

Reputation: 2814

Bitmap byte-size after decoding?

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)

Thanks for any solutions!

Update: getRowBytes * getHeight might do the trick.. I'll implement it this way until someone comes up with something against it.

Upvotes: 76

Views: 86810

Answers (4)

android developer
android developer

Reputation: 116050

It's best to just use the support library:

int bitmapByteCount=BitmapCompat.getAllocationByteCount(bitmap)

But if you have the Android project to use at least minSdk of 19 (kitkat, meaning 4.4), you can just use bitmap.getAllocationByteCount() .

Upvotes: 64

ahmed_khan_89
ahmed_khan_89

Reputation: 2773

public static int sizeOf(Bitmap data) {
    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB_MR1) {
        return data.getRowBytes() * data.getHeight();
    } else if (Build.VERSION.SDK_INT<Build.VERSION_CODES.KITKAT){
        return data.getByteCount();
    } else{
        return data.getAllocationByteCount();
    }
}

The only difference with @user289463 answer, is the use of getAllocationByteCount() for KitKat and above versions.

Upvotes: 8

Patrick
Patrick

Reputation: 35232

Here is the 2014 version that utilizes KitKat's getAllocationByteCount() and is written so that the compiler understands the version logic (so @TargetApi is not needed)

/**
 * returns the bytesize of the give bitmap
 */
public static int byteSizeOf(Bitmap bitmap) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
        return bitmap.getAllocationByteCount();
    } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR1) {
        return bitmap.getByteCount();
    } else {
        return bitmap.getRowBytes() * bitmap.getHeight();
    }
}

Note that the result of getAllocationByteCount() can be larger than the result of getByteCount() if a bitmap is reused to decode other bitmaps of smaller size, or by manual reconfiguration.

Upvotes: 22

user289463
user289463

Reputation: 2814

getRowBytes() * getHeight() seems to be working fine to me.

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

----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();
        }
    }

Upvotes: 125

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