How to set background drawable programmatically in Android

java

android-development

performance-optimization

best-practices

byNikita Barsukov·Sep 17, 2024

To set a background drawable to an Android view programmatically, you can use the following code:

// Find that button like it's a game of Where's Waldo
Button myButton = findViewById(R.id.my_button);
// Rydell High's resident bad boy Danny Zuko said it best, 
// "You're the (drawable) that I want" 🎵🎵R.drawable.my_drawable 🎵🎵
myButton.setBackground(ContextCompat.getDrawable(getApplicationContext(), R.drawable.my_drawable));

Replace myButton and my_drawable with your respective ID and drawable. For those adventurous folks still rocking devices fossilized in pre-API 16 times, don't fret, there's this option too:

//Old school cool
myButton.setBackgroundDrawable(getResources().getDrawable(R.drawable.my_drawable));

Make sure to replace myButton and my_drawable with your button's and drawable's actual names. Talk about a personal touch, right?

Navigating Android versions

As Android versions get more numerous than Star Trek sequels, here are some best practices:

ContextCompat.getDrawable(): No need to feel like Goldilocks with this one. It helps find the drawable that’s just right for the Android version you're dealing with.
ResourcesCompat.getDrawable(): Like a time lord, it transcends time and space (or at least Android versions)
AppCompatResources.getDrawable(): Your golden ticket for AndroidX compatibility

And remember, folks, using getResources().getDrawable() without the fab three above is like bringing Spock to a Sith fight: it's deprecated and incompatible with newer API versions.

Working with large drawables

Feeling like Atlas, carrying the world of large bitmaps and complex drawables? Let these practices be your Hercules:

Performance Optimization: Nobody likes a "Sorry! The app stopped working" pop up. Ensure you follow Android's advice on loading large bitmaps efficiently to avoid tripping over OOM errors.
Lifecycle consciousness: Be the lifecycle whisperer and set backgrounds in the onCreate() or onResume() functions. It's best to tickle the dragon's tail when it's sure to be seen.

Adding a touch of diligence

Here's what your checklist should look like when dealing with drawables:

Global references: To access views across different methods, declare them globally. Because who wants to play hide n seek with views?
Null checks: Null errors are the scarecrows in fields of code; don't forget to guard against them.
Layout references: Check and recheck! Ensure the correct view reference is being modified.
Usage of setContentView(): Think of this as serving the main course; do it after setting the background to savor the full effect.
Support library inclusion: Don't leave the support-v4 library (or equivalent AndroidX libraries) behind. Like a passport, it unlocks compatibility doors.
SDK best practices: Familiarity with target SDK version practices ensures your app plays nice across different Android versions.

explain-codes / Java / How to set background drawable programmatically in Android

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