You want to use an ImageView on your App and you are wondering which ScaleType you should use. I have a good news for you, there is an App for that
Yes I created an App that you can find here to show you all the different ScaleType values. And even further below are screenshots of all those values side by side
The full descriptions of each ScaleType from the official Android documentation.
CENTER
Center the image in the view, but perform no scaling.
android:scaleType="center"
CENTER_CROP
Scale the image uniformly (maintain the image's aspect ratio) so that both dimensions (width and height) of the image will be equal to or larger than the corresponding dimension of the view (minus padding).
android:scaleType="centerCrop"
CENTER_INSIDE
Scale the image uniformly (maintain the image's aspect ratio) so that both dimensions (width and height) of the image will be equal to or less than the corresponding dimension of the view (minus padding).
android:scaleType="centerInside"
FIT_CENTER
Scale the image using Matrix.ScaleToFit#CENTER.
android:scaleType="fitCenter".
FIT_END
Scale the image using Matrix.ScaleToFit#END.
android:scaleType="fitEnd"
FIT_START
Scale the image using Matrix.ScaleToFit#START.
android:scaleType="fitStart"
FIT_XY
Scale the image using Matrix.ScaleToFit#FILL.
android:scaleType="fitXY"
MATRIX
Scale using the image matrix when drawing. The image matrix can be set using ImageView#setImageMatrix(Matrix).
android:scaleType="matrix"
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