Add a button you can tap to trigger a crash. Paste this code into your layout where you’d like the button to appear.
<Button
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:text="Force Crash!"
android:onClick="forceCrash"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true" />
Throw a RuntimeException
public void forceCrash(View view) {
throw new RuntimeException("This is a crash");
}
Run your app and tap the new button to cause a crash. In a minute or two you should be able to see the crash on your Crashlytics dashboard as well as you will get a mail.