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Resize a bitmap respecting the aspect radio. I use a custom transformations with Picasso library. This transformation calculate the new dimension of the bitmap scaling it to fit a specific width or height that we pass as a parameter (usually the biggest size of the imageView where we wanna set the bitmap).
public class ScaleToFitWidthHeightTransform implements Transformation {
private int mSize;
private boolean isHeightScale;
public ScaleToFitWidthHeightTransform(int size, boolean isHeightScale){
mSize =size;
this.isHeightScale = isHeightScale;
public Bitmap transform(Bitmap source) {
float scale;
int newSize;
Bitmap scaleBitmap;
scale = (float) mSize / source.getHeight();
newSize = Math.round(source.getWidth() * scale);
scaleBitmap= Bitmap.createScaledBitmap(source, newSize, mSize, true);
scale = (float) mSize / source.getWidth();
newSize = Math.round(source.getHeight() * scale);
scaleBitmap = Bitmap.createScaledBitmap(source, mSize,newSize, true);
if (scaleBitmap != source) {
return scaleBitmap;
public String key() {
return "scaleRespectRatio" + mSize + isHeightScale;
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