The app crashes in Logcat with 'java.lang.NullPointerException'. This is often caused by findViewById returning null due to a wrong layout ID, or calling a method on an object before it's initialized.
Trace the exact line from the stack trace, verify view IDs match the inflated layout, and use ViewBinding to eliminate findViewById-related null risks entirely.
Step-by-Step Guide
Read the Logcat stack trace carefully - it names the exact line and variable
Verify the view ID used in findViewById matches the XML layout exactly
Initialize objects in onCreate() (after setContentView), not in field declarations
Migrate to ViewBinding to remove findViewById null-safety issues entirely
Add explicit null checks before calling methods on views or objects
Use @Nullable and @NonNull annotations to catch issues at compile time
Enable Android Lint / NullAway static analysis in your build
Never call view methods before setContentView() has run
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