CODEWITHSUNDEEP
javaandroidimagebitmap
smith324
smith324

Reputation: 13060

Crop and resize an image in Android

I am reading an image from disk and displaying it inside of a row in a ListView. The image files are larger than what needs to be displayed inside the ImageView of the rows. Since I need to cache the bitmaps in RAM for faster access I would like them to only be as large as the ImageViews (85x85 dip)

Right now I am reading in the file with

bitmap = BitmapFactory.decodeFile(file);

and the ImageView is responsible for scaling and cropping it

android:scaleType="centerCrop"

AFAIK this is keeping the entire bitmap in memory (because I cached it XD) and that is bad

How can I remove this responsibility from the ImageView and do the crop + scale while loading the file? All the bitmaps will be displayed at 85x85 dip and need to be 'centerCrop'

Upvotes: 3

Views: 13562

Answers (1)

Phyrum Tea
Phyrum Tea

Reputation: 2653

You can find out the dimensions of your pictures before loading, cropping and scaling:


BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;

    Bitmap bmo = BitmapFactory.decodeFile(file.getAbsolutePath(), options);

Then load it in sample size:


...
options.inSampleSize = 1/2;
bmo = BitmapFactory.decodeFile(file.getAbsolutePath(), options);

...
 = Bitmap.createScaledBitmap(bmo, dW, dH, false);

don't forget to recycle temporary bitmaps or you'll get OOME.


bmo.recycle();

Upvotes: 6

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