android studio update image on button press

Above we discussed the fitXY type along with adjustViewBounds to match the aspect ratio of the drawable. Scale TypesĪn ImageView can display an image differently based on the scaleType provided.

We can achieve this using an extended ResizableImageView class as described in the post. In certain cases, the image needs to be scaled to fit the parent view's width and the height should be adjusted proportionally. We can also size an ImageView at runtime within our Java source code by modifying the width or height inside getLayoutParams() for the view: imageView. īy combining these properties together we can control the rough size of the image and still adjust the image according to the proper aspect ratio. Otherwise, the dimensions cannot be readjusted to meet the required aspect ratio. by using maxWidth and using wrap_content for the dimension). However, we must either allow the height and/or width to be adjustable (i.e. We can take advantage of the adjustViewBounds parameter to preserve this aspect ratio. The scaleType above has been set to fitXY which sets the height and the width up or down to fit the maximum dimensions specified.įixing the width and height however means that the proportions of the width and height of the original image, known as the aspect ratio, will be altered. They can also be bounded by their layout_width and layout_height attributes: Sizing ImageView Controlsīy default, contents of an ImageView control are of a certain size - usually the size of the image dimensions.

In the example, using scaleType 'center', the image will be displayed at its native resolution and centered in the view, regardless of how much space the view consumes. Note the scaleType attribute which defines how the images will be scaled to fit in your layout. The ImageView handles all the loading and scaling of the image for you. The ImageView looks like this in res/layout/activity_main.xml: UsageĪt the simplest level, an ImageView is simply a view you embed within an XML layout that is used to display an image (or any drawable) on the screen. In this guide, we will take a look at how to use an ImageView, how to manipulate bitmaps, learn about the different density folders and more. This view takes care of the loading and optimizing of the image, freeing you to focus on app-specific details like the layout and content. Typically, images are displayed using the built-in image view.

Android studio update image on button press