crashing in style

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crashing in style

  1. 1. Crashing inCrashing in
  2. 2. About /me • Tam HANNA – CEO, Tamoggemon Ltd. – Director, Tamoggemon Holding k.s. – Runs web sites about mobile computing – Writes scientific books
  3. 3. About /girly • Annette BOSBACH – Clerk to the coordinating office, Tamoggemon Holding k.s. – First GottaTxt fan
  4. 4. Overview • The schedule • Why track crashes • Basic methods • ACRA
  5. 5. Source code • JAVA Source code is available – Via Twitter • Our IP: free to use – Too low to qualify for protection – Plus, you have to listen to us so 
  6. 6. The schedule
  7. 7. Crash first, Qt second• 60% / 40% – More about Qt: at our booth • Please tweet about us
  8. 8. The @tamhanna show is co GottaTxt is the best app at #droidconnl After listening to @tamhanna, my app doesn‘t crash anymore!!! @tamhanna threw chocolate on my head. Ouch! #droidconnl
  9. 9. Why trackWhy track
  10. 10. Market is crowded • Bad ratings kill an application • BUT: responding to feedback helps – „The developer responds to ME!!!“ – I am important – Ego issues => superhappy customer
  11. 11. Why track crashes? • Isn‘t it better not to crash? – Matthew A Brenner, UnME2 • Yes, but – Ever-increasing number of LOC – Fragmentation (to see /me mention that ) – Margin pressure • TU144 / Concorde problem
  12. 12. Users are stupid • What OS version do you use? – Common question for developers – Perceived as denigration by some users • Send me a file from the file system! – Common question for developers – But for developer‘s wife or husband?
  13. 13. Crash vs stat tracking• Stat tracking – Which flows are used – Entry/Exit path analysis – e.g. Google Analytics • Crash tracking – What causes crashes – Where do users „die“
  14. 14. And there‘s more • Track „points of pain“ for users – Rejection of user input – Games: user death • Fix them in the next release – First 2min with application are critical
  15. 15. Private debuggerPrivate debugger Picture: Wikimedia Commons / fluteflute
  16. 16. What‘s that • Special mode of operation – Allows developer access to internals – ON the users phone • Can be accessed via secret key – Must be easy to enter, difficult to guess – Prevent users from entering it by mistake • Customer provides info to developer
  17. 17. How to implement • By foot • No ready made libraries available
  18. 18. Example • GottaTxt 1. Open Thread 2. Enter „Secret Code“ 3. Enter commands 4. Give response
  19. 19. Try it at our booth FREE VODKAFREE VODKA INCLUDED!!!INCLUDED!!!
  20. 20. Basic crashBasic crash handlinghandling Wikimedia Commons / David Monack
  21. 21. Really easy way • Thread.setDefaultExceptionHandler() • Write to file, then die • Tell user to email file – Can usually be accomplished
  22. 22. Problems • IO is buffered • Thread terminates before data written • Data lost • !!!Occurs rarely!!! – Never saw it on Android
  23. 23. Non-working solution• StackOverflow user gupta • Fire intent from exception handler • Hope for it to arrive
  24. 24. Non-working solution - II• Doesn‘t work in practice • Intent never arrives at application
  25. 25. Workable solution • Completely override crash handling – No Android Crash message shown • Re-invoke application • Example a360crash1
  26. 26. public ExceptionTrap(Context _context, String _filePath) { myContext=_context; myFilePath=_filePath; myHandler=Thread.getDefaultUncaughtExceptionHandler(); }
  27. 27. @Override public void uncaughtException(Thread _t, Throwable _a) { try { StringWriter s=new StringWriter(); _a.printStackTrace(new PrintWriter(s)); Intent launchIntent=new Intent(ErrorReporter.INTENTSTRING); launchIntent.putExtra("StackTrace", s.toString()); launchIntent.putExtra("FilePath", myFilePath); PendingIntent pIntent=PendingIntent.getService(myContext, 0, launchIntent, launchIntent.getFlags()); AlarmManager mgr = (AlarmManager) myContext.getSystemService(Context.ALARM_SERVICE); mgr.set(AlarmManager.RTC, System.currentTimeMillis() + 2000, pIntent); System.exit(2);
  28. 28. public class ErrorReporter extends IntentService { public static final String INTENTSTRING ="com.tamoggemon.a360crash1.intent.CALLERRORREPORTER"; public ErrorReporter() { super("TAG"); } @Override public void onCreate() { super.onCreate(); }
  29. 29. protected void onHandleIntent(Intent intent) {//Newline, etc removed try { boolean newFile=false; File writeFile=new File(intent.getStringExtra("FilePath")); if(writeFile.exists()==false) { newFile=true; writeFile.createNewFile(); } BufferedWriter buf = new BufferedWriter(new FileWriter(writeFile, true)); if(newFile) { buf.append(android.os.Build.MODEL); buf.append(android.os.Build.VERSION.RELEASE); } buf.append("-------------------CRASH-------------------") buf.append(intent.getStringExtra("StackTrace"));
  30. 30. public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); myTrap=new ExceptionTrap(this, "/sdcard/A360Crash.log"); Thread.setDefaultUncaughtExceptionHandler(myTrap); setContentView(R.layout.main); findViewById(R.id.button1).setOnClickListener(this); } @Override public void onClick(View v) { throw new RuntimeException("Fehler erfolgreich ausgelöst!"); }
  31. 31. <service android:name=".ErrorReporter"> <intent-filter > <action android:name="com.tamoggemon.a360crash1.intent.CALLERROR REPORTER" /> </intent-filter> </service>
  32. 32. ACRAACRAWikimedia Commons / gerol
  33. 33. What is ACRA • Android Crash Report for Android • Very flexible library • Can dump crash data to Google Docs
  34. 34. Set up online • Google Account needed • Create new form via SpreadSheet • Export it to get FormKey
  35. 35. Integrate into app @ReportsCrashes(formKey = "dExKcElJWjVaUkpMem9WOWg3VE80SlE6MQ") public class MyApplication extends Application { @Override public void onCreate() { ACRA.init(this); super.onCreate(); } }
  36. 36. Custom data • if(v==cmdStoreA) • { • ErrorReporter.getInstance().putCustomData("myVariable ", "A"); • } • if(v==cmdStoreB) • { • ErrorReporter.getInstance().putCustomData("myVariable ", "B"); • }
  37. 37. Enable / Disable • if(v==cmdEnable) • { • SharedPreferences aPrefs=ACRA.getACRASharedPreferences(); • Editor anEditor=aPrefs.edit(); • anEditor.putBoolean("acra.enable", true); • anEditor.commit(); • } • if(v==cmdDisable) • { • SharedPreferences aPrefs=ACRA.getACRASharedPreferences(); • Editor anEditor=aPrefs.edit(); • anEditor.putBoolean("acra.enable", false); • anEditor.commit(); • }
  38. 38. Further Options • ACRA does a LOT – Interact with users – Custom databases • https://github.com/ACRA/acra/wiki/AdvancedUsage
  39. 39. OOP FTW
  40. 40. Problem of all solutions• Integration requires manual work – Find all classes – Integrate logging code • Better solution: „stub objects“
  41. 41. How to implement it • By foot • Loads of leeway for developers – Abstract actual logging?
  42. 42. Example public abstract class TMGNActivity extends Activity { @Override public final void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); logThis("Creating Activity"); logThis(getClass().getName()); tmgnOnCreate(savedInstanceState); } public abstract void tmgnOnCreate(Bundle savedInstanceState);
  43. 43. Other vendors
  44. 44. Google Play Crash tracking• Google Play provides crash tracking – Rudimentary, can‘t add own data • Better than nothing – Check often – Log-in freq. could (!!!) be used for ranking
  45. 45. Crash Trackers • BugSense – Specialized service • Flurry – Afterthought for premium analytics • Yours? – Tell us in Q&A
  46. 46. ConclusionConclusion
  47. 47. Crashes will happen • Today‘s mobile apps are – Highly complex – Underfunded (thanks, Apple!) • Even the OS crashes sometimes • Users tolerate reasonable crashingUsers tolerate reasonable crashing
  48. 48. Work-arounds are needed• Paid users expect frequent updates – Let them generate their wishes themselves • Monitoring is first step to improvement – See what users really think
  49. 49. Olympic spirit • Important: – TRACK CRASHES – Perform PDCA cycle on data • Not so important – How to track them – Track 100% of them
  50. 50. ?!? tamhan@tamoggemon.com @tamhanna
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