Timber and Crashlytics are a good match for logging and crash reporting in Android apps. Timber provides logging utilities and can be configured to report logs and crashes to Crashlytics in production instead of just logcat. An AppCrashHandler can restart the app instead of showing an ugly system dialog when a crash occurs.

1. Timber + Crashlytics →
A match made in
heaven
DAMIAN MARUŠIĆ

2. MAIN TOPICS
• Timber
• Crashlytics
• App crash handler

3. WHAT DO WE WANT ?
• Development - logging to logcat
• Production - crash reporting to Crashlytics

4. TIMBER
• Utility on top of Android's normal Log class
• by Jake Wharton

5. Timber.plant(new Timber.DebugTree());
Timber.d(...)
Timber.i(...)
Timber.v(...)
Timber.e(...)
Timber.w(...)
Timber.wtf(...)

6. CRASHLYTICS
• Crash reporting tool
• Automatic and manual crash reports
• Stack trace
• Android version
• Device model
• etc.

8. CRASH REPORTING TREE
private static class CrashReportingTree extends Timber.Tree {
@Override
protected void log(int priority, String tag, String message, Throwable t) {
if (priority == Log.VERBOSE || priority == Log.DEBUG) {
return;
}
// will write to the crash report but NOT to logcat
Crashlytics.log(message);
if (t != null) {
Crashlytics.logException(t);
}
}
}

9. CRASH REPORTING TREE
@Override
public void onCreate() {
super.onCreate();
CrashlyticsCore crashlyticsCore = new CrashlyticsCore.Builder()
.disabled(BuildConfig.DEBUG).build();
Fabric.with(this, new Crashlytics.Builder().core(crashlyticsCore).build());
if (BuildConfig.DEBUG) {
Timber.plant(new Timber.DebugTree());
} else {
Timber.plant(new CrashReportingTree());
}
}

10. USAGE
try {
...
} catch (Exception e) {
Timber.e(e, "Failure in " + getClass().getSimpleName());
}

11. APP CRASH HANDLER
• No more ugly system dialogs
• Restart app
• Simple configuration
• by Square

12. APP CRASH HANDLER
→

13. APP CRASH HANDLER EXAMPLE
public class AppCrashHandler implements Thread.UncaughtExceptionHandler {
private Activity liveActivity;
public AppCrashHandler(Application application) {
application.registerActivityLifecycleCallbacks(new
Application.ActivityLifecycleCallbacks() {
@Override
public void onActivityResumed(Activity activity) {
liveActivity = activity;
}
@Override
public void onActivityPaused(Activity activity) {
liveActivity = null;
}
});
}
@Override
public void uncaughtException(Thread thread, Throwable ex) {
if(liveActivity != null){
Intent intent = new Intent(getApplicationContext(), MainActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
liveActivity.finish();
liveActivity.startActivity(intent);
}
System.exit(0);
}
}

14. APP CRASH HANDLER EXAMPLE
@Override
public void onCreate() {
super.onCreate();
Thread.setDefaultUncaughtExceptionHandler(new AppCrashHandler(this));
}

15. Thank you!
DAMIAN.MARUSIC@INFINUM.HR
Visit infinum.co or find us on social networks:
infinum.co infinumco infinumco infinum

16. REFERENCES
• Timber - https://github.com/JakeWharton/timber
• Square’s approach to Android crashes - https://vimeo.com/
145042944
• Željko’s crash handler lib - https://github.com/zplesac/
android-crash-handler