Uploaded on

 

More in: Technology
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Be the first to comment
    Be the first to like this
No Downloads

Views

Total Views
96
On Slideshare
0
From Embeds
0
Number of Embeds
1

Actions

Shares
Downloads
0
Comments
0
Likes
0

Embeds 0

No embeds

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
    No notes for slide

Transcript

  • 1. Crashing inCrashing in
  • 2. About /me • Tam HANNA – CEO, Tamoggemon Ltd. – Director, Tamoggemon Holding k.s. – Runs web sites about mobile computing – Writes scientific books
  • 3. About /girly • Annette BOSBACH – Clerk to the coordinating office, Tamoggemon Holding k.s. – First GottaTxt fan
  • 4. Overview • The schedule • Why track crashes • Basic methods • ACRA
  • 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. The schedule
  • 7. Crash first, Qt second• 60% / 40% – More about Qt: at our booth • Please tweet about us
  • 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. Why trackWhy track
  • 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. 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. 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. 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. 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. Private debuggerPrivate debugger Picture: Wikimedia Commons / fluteflute
  • 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. How to implement • By foot • No ready made libraries available
  • 18. Example • GottaTxt 1. Open Thread 2. Enter „Secret Code“ 3. Enter commands 4. Give response
  • 19. Try it at our booth FREE VODKAFREE VODKA INCLUDED!!!INCLUDED!!!
  • 20. Basic crashBasic crash handlinghandling Wikimedia Commons / David Monack
  • 21. Really easy way • Thread.setDefaultExceptionHandler() • Write to file, then die • Tell user to email file – Can usually be accomplished
  • 22. Problems • IO is buffered • Thread terminates before data written • Data lost • !!!Occurs rarely!!! – Never saw it on Android
  • 23. Non-working solution• StackOverflow user gupta • Fire intent from exception handler • Hope for it to arrive
  • 24. Non-working solution - II• Doesn‘t work in practice • Intent never arrives at application
  • 25. Workable solution • Completely override crash handling – No Android Crash message shown • Re-invoke application • Example a360crash1
  • 26. public ExceptionTrap(Context _context, String _filePath) { myContext=_context; myFilePath=_filePath; myHandler=Thread.getDefaultUncaughtExceptionHandler(); }
  • 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. 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. 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. 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. <service android:name=".ErrorReporter"> <intent-filter > <action android:name="com.tamoggemon.a360crash1.intent.CALLERROR REPORTER" /> </intent-filter> </service>
  • 32. ACRAACRAWikimedia Commons / gerol
  • 33. What is ACRA • Android Crash Report for Android • Very flexible library • Can dump crash data to Google Docs
  • 34. Set up online • Google Account needed • Create new form via SpreadSheet • Export it to get FormKey
  • 35. Integrate into app @ReportsCrashes(formKey = "dExKcElJWjVaUkpMem9WOWg3VE80SlE6MQ") public class MyApplication extends Application { @Override public void onCreate() { ACRA.init(this); super.onCreate(); } }
  • 36. Custom data • if(v==cmdStoreA) • { • ErrorReporter.getInstance().putCustomData("myVariable ", "A"); • } • if(v==cmdStoreB) • { • ErrorReporter.getInstance().putCustomData("myVariable ", "B"); • }
  • 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. Further Options • ACRA does a LOT – Interact with users – Custom databases • https://github.com/ACRA/acra/wiki/AdvancedUsage
  • 39. OOP FTW
  • 40. Problem of all solutions• Integration requires manual work – Find all classes – Integrate logging code • Better solution: „stub objects“
  • 41. How to implement it • By foot • Loads of leeway for developers – Abstract actual logging?
  • 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. Other vendors
  • 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. Crash Trackers • BugSense – Specialized service • Flurry – Afterthought for premium analytics • Yours? – Tell us in Q&A
  • 46. ConclusionConclusion
  • 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. 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. Olympic spirit • Important: – TRACK CRASHES – Perform PDCA cycle on data • Not so important – How to track them – Track 100% of them
  • 50. ?!? tamhan@tamoggemon.com @tamhanna