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Working with ImageViews and Bitmaps in Android Application Development

Jul 27, 2015

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Android Application Development in 24 Hours, Sams Teach Yourself, 4th Edition

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Introducing Picasso

Picasso is an open source Android library from the team at Square. Picasso is an image downloading and caching library. When you use Picasso to download and display an image, the library keeps track of whether it has a copy of the image in memory or stored locally on the disk. The response time for retrieving and showing images in Picasso is very fast.

Picasso uses a context that is often your current Activity. In this example, the context is indicated by this, which refers to the Activity. Basic usage for displaying an image from a resource file into an ImageView is as follows:

        Picasso.with(this).load(R.drawable.ic_launcher).into(imageView);

There are many other methods for Picasso; you can learn more at http://square.github.io/picasso/.

TRY IT YOURSELF: Installing and Using Picasso

Picasso enhances your app when you work with images and bitmaps. These are the steps to download and use Picasso:

Go to http://square.github.io/picasso/ to learn more about Picasso.
In Android Studio, in Project view, find the app folder and locate the build.gradle file.
Add the line compile ‘com.squareup.picasso:picasso:2.5.0’ to the dependencies. That adds the Picasso library to the project.
Create an Activity with an ImageView.
Display an image from the drawable resources folder into the ImageView using Picasso.

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