android - Why do my objects become null on returning to my previous Activity -


i have 2 activities suppose , b;

activity a has several objects of view [textview, tabview, listview etc]:

i fire intent using startactivityforresult , go activity b

then computation required in activity b , return activity a setruslt , finish();

on returning onactivityresult work according result sent activity b;

everything above works fine.[during testing]

but when have deployed application facing crashes [unexpected nullpointer exception]

-> in cases listview inside onresume method null;

-> in cases tabview null;

-> in cases database object instance null;

am missing important step of activity lifecycle. works fine while in testing.

please note: have map views on both activities

please help. thank in advance.

here's stack trace

java.lang.nullpointerexception @ in.abmulani.thisway.mainactivity.onkeydown(mainactivity.java:511) @ android.view.keyevent.dispatch(keyevent.java:2719) @ android.app.activity.dispatchkeyevent(activity.java:2419) @ com.android.internal.policy.impl.phonewindow$decorview.dispatchkeyevent(phonewindow.java:190) @ android.view.viewrootimpl.deliverkeyeventpostime(viewrootimpl.java:4150) @ android.view.viewrootimpl.handleimefinishedevent(viewrootimpl.java:4112) @ android.view.viewrootimpl$viewroothandler.handlemessage(viewrootimpl.java:3292) @ android.os.handler.dispatchmessage(handler.java:99)

sometimes data in onactivityresult null.have checked it?

and if activity has launchmode of singleinstance,the onactivityresult invoked android staractivityforresult.make sure activity not singleinstance activity.

last, have done in onresume method?


Comments

Post a Comment

Popular posts from this blog

Android layout hidden on keyboard show -

i have strange problem layout. when tap on edittext , keyboard shown edittext stay on bottom , when tap on to hide keyboard , keyboard hides , edittext go should when want input text. when tap again, keyboard shown , edittext goes down behind keyboard... <relativelayout android:layout_width="match_parent" android:layout_height="match_parent" > <scrollview android:layout_width="match_parent" android:layout_height="fill_parent" android:above="@+id/rl_commands"> <textview android:layout_width="match_parent" android:layout_height="wrap_content"/> </scrollview> <relativelayout android:layout_width="match_parent android:layout_height="24dp" android:id="@+id/rl_commands" android:alignparentbottom="true">
Read more

google app engine - 403 Forbidden POST - Flask WTForms -

i have flask application running on google app engine. trying submit form built using wtform , keep getting following error. 403 forbidden: don't have permission access requested resource. either read-protected or not readable server. location.html (part of code) <form method=post action="/home/location"> .... <button type="submit" class="btn btn-primary" value="submit"> directions </button> </form> main.py @app.route('/home/location', methods=['post', 'get']) def location(): form = cfcdirections.direction(request.form) print(request.method) if request.method == 'post' , form.validate(): print("after if") directions = cfcdirections() street_no = directions.no street = directions.street suburb = directions.suburb postcode = directions.postcode
Read more

c - Why would PK11_GenerateRandom() return an error -8023? -

i looking through internet trying find source of pk11_generaterandom() function see why function fail. have program uses function when moved new flavor of linux, fails after forking ( fork() ) since not believe there problem nss, suspect doing incorrectly disregarded in older versions of linux new 1 there issue. the openssl package same on 'good' , 'bad' server: openssl 0.9.8e-fips-rhel5 01 jul nss rpm differs though. 'good' has nss-3.12.2.0-2.el5 and bas has version nss-3.15.3-4.el5_10 the 'good' server uses quite obsolete linux: linux 2.6.18-128.el5 #1 smp wed jan 21 08:45:05 est 2009 x86_64 x86_64 x86_64 gnu/linux enterprise linux enterprise linux server release 5.3 (carthage) red hat enterprise linux server release 5.3 (tikanga) the 'bad' server newer: linux bad 2.6.18-371.4.1.el5 #1 smp wed jan 29 11:05:49 pst 2014 x86_64 x86_64 x86_64 gnu/linux oracle linux server release 5.10 red hat enterprise linux server release
Read more