Develop Reference

app crashes when changing the font style of the device

I am facing a issue in Samsung mobile, the issue is this, i open the application that i have made and minimized the app now the app is running at the background, now i go to my mobile
settings-->Display--> font style,
Then i changed the font when i come back and open the app that was running at the back ground the app crashes
I do not know where the issue is can you please give some idea on how to move about
This was the error that i was able to see in my logcat
2-12 17:58:54.883 1473-1473/com.mysmcc E/AndroidRuntime: FATAL EXCEPTION: main Process: com.mysmcc, PID: 1473 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mysmcc/com.mysmcc.activities.AppMainActivity}: java.lang.StringIndexOutOfBoundsException: length=0; index=0 at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2695) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2769) at android.app.ActivityThread.access$900(ActivityThread.java:177) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1430) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5910) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1405) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1200) Caused by: java.lang.StringIndexOutOfBoundsException: length=0; index=0 at java.lang.String.indexAndLength(String.java:500) at java.lang.String.charAt(String.java:494) at android.graphics.Color.parseColor(Color.java:209) at com.mysmcc.activities.AppMainActivity.onCreate(AppMainActivity.java:213) at android.app.Activity.performCreate(Activity.java:6178) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2648) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2769) at android.app.ActivityThread.access$900(ActivityThread.java:177) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1430) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5910) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1405) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1200)

Telegram getting force closed on VOIP call?

Getting following error:
FATAL EXCEPTION: main
Process: com.SocialMob.Txme, PID: 29963
java.lang.UnsatisfiedLinkError: No implementation found for void
org.telegram.messenger.voip.VoIPController.nativeSetAudioOutputGainControlEnabled(long,
boolean) (tried
Java_org_telegram_messenger_voip_VoIPController_nativeSetAudioOutputGainControlEnabled
and
Java_org_telegram_messenger_voip_VoIPController_nativeSetAudioOutputGainControlEnabled__JZ)
at org.telegram.messenger.voip.VoIPController.nativeSetAudioOutputGainControlEnabled(Native
Method)
at org.telegram.messenger.voip.VoIPController.setAudioOutputGainControlEnabled(VoIPController.java:244)
at org.telegram.messenger.voip.VoIPBaseService.updateOutputGainControlState(VoIPBaseService.java:691)
at org.telegram.messenger.voip.VoIPBaseService.configureDeviceForCall(VoIPBaseService.java:445)
at org.telegram.messenger.voip.VoIPService.startOutgoingCall(VoIPService.java:200)
at org.telegram.messenger.voip.VoIPService.access$100(VoIPService.java:64)
at org.telegram.messenger.voip.VoIPService$1.run(VoIPService.java:127)
at android.os.Handler.handleCallback(Handler.java:746)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5459)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)

One of the libraries of the telegram was updated and was not mentioned on the source code page.
By updating library https://github.com/grishka/libtgvoip, and cleaning my project made my app working fine

Android Oreo's downloadable fonts exceptions

Just uploaded a new version of my app to beta with the new Downloadable Fonts and Fonts in XML features and the pre-launch report from google is showing me crashes on some devices.
LG G6, Android 7.0:
FATAL EXCEPTION: ControllerMessenger
Process: com.example.mobile, PID: 11263
java.lang.NullPointerException: Attempt to invoke a virtual method on a null object reference
at android.support.v4.graphics.TypefaceCompatUtil.mmap(TypefaceCompatUtil.java:98)
at android.support.v4.graphics.TypefaceCompatApi24Impl.createFromFontInfo(TypefaceCompatApi24Impl.java:140)
at android.support.v4.graphics.TypefaceCompat.createFromFontInfo(TypefaceCompat.java:167)
at android.support.v4.provider.FontsContractCompat.getFontInternal(FontsContractCompat.java:190)
at android.support.v4.provider.FontsContractCompat.getFontSync(FontsContractCompat.java:244)
at android.support.v4.graphics.TypefaceCompat.createFromResourcesFamilyXml(TypefaceCompat.java:124)
at android.support.v4.content.res.ResourcesCompat.loadFont(ResourcesCompat.java:390)
at android.support.v4.content.res.ResourcesCompat.loadFont(ResourcesCompat.java:336)
at android.support.v4.content.res.ResourcesCompat.getFont(ResourcesCompat.java:205)
at com.example.libs.fragments.BaseFragment.onStart(BaseFragment.java:148)
at android.support.v4.app.Fragment.performStart(Fragment.java:2287)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1458)
at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1750)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1819)
at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:797)
at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2590)
at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2377)
at android.support.v4.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2332)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2239)
at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:700)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.support.test.espresso.base.Interrogator.loopAndInterrogate(Interrogator.java:148)
at android.support.test.espresso.base.UiControllerImpl.loopUntil(UiControllerImpl.java:466)
at android.support.test.espresso.base.UiControllerImpl.loopUntil(UiControllerImpl.java:420)
at android.support.test.espresso.base.UiControllerImpl.injectMotionEvent(UiControllerImpl.java:234)
at android.support.test.espresso.action.MotionEvents.sendUp(MotionEvents.java:140)
at android.support.test.espresso.action.MotionEvents.sendUp(MotionEvents.java:123)
at android.support.test.espresso.action.Tap.sendSingleTap(Tap.java:170)
at android.support.test.espresso.action.Tap.access$100(Tap.java:31)
at android.support.test.espresso.action.Tap$1.sendTap(Tap.java:46)
at android.support.test.espresso.action.GeneralClickAction.perform(GeneralClickAction.java:136)
at android.support.test.espresso.ViewInteraction$SingleExecutionViewAction.perform(ViewInteraction.java:355)
at android.support.test.espresso.ViewInteraction.doPerform(ViewInteraction.java:242)
at android.support.test.espresso.ViewInteraction.access$100(ViewInteraction.java:62)
at android.support.test.espresso.ViewInteraction$1.call(ViewInteraction.java:149)
at android.support.test.espresso.ViewInteraction$1.call(ViewInteraction.java:146)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6316)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:872)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:762)
Moto G4 Play, Android 6.0:
FATAL EXCEPTION: main
Process: com.example.mobile, PID: 13208
java.lang.NullPointerException: Attempt to read from field 'int android.support.v4.provider.FontsContractCompat$TypefaceResult.mResult' on a null object reference
at android.support.v4.provider.FontsContractCompat$2.onReply(FontsContractCompat.java:277)
at android.support.v4.provider.FontsContractCompat$2.onReply(FontsContractCompat.java:274)
at android.support.v4.provider.FontsContractCompat$3.onReply(FontsContractCompat.java:312)
at android.support.v4.provider.FontsContractCompat$3.onReply(FontsContractCompat.java:300)
at android.support.v4.provider.SelfDestructiveThread$2$1.run(SelfDestructiveThread.java:149)
at android.os.Handler.handleCallback(Handler.java:746)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5459)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
P8 Lite, Android 5.0:
FATAL EXCEPTION: main
Process: com.example.mobile, PID: 19646
android.view.InflateException: Binary XML file line #145: Error inflating class
at android.view.LayoutInflater.createView(LayoutInflater.java:652)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:762)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:825)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:828)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:828)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:828)
at android.view.LayoutInflater.inflate(LayoutInflater.java:523)
at android.view.LayoutInflater.inflate(LayoutInflater.java:425)
at com.example.libs.fragments.BasicBaseFragment.initView(BasicBaseFragment.java:46)
at com.example.libs.fragments.BasicBaseFragment.onCreateView(BasicBaseFragment.java:73)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:2261)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1419)
at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1750)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1819)
at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:797)
at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2590)
at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2377)
at android.support.v4.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2332)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2239)
at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:700)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5538)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:960)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Constructor.newInstance(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:288)
at android.view.LayoutInflater.createView(LayoutInflater.java:626)
... 27 more
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.os.ParcelFileDescriptor.getFd()' on a null object reference
at android.support.v4.graphics.TypefaceCompatApi21Impl.getFile(TypefaceCompatApi21Impl.java:50)
at android.support.v4.graphics.TypefaceCompatApi21Impl.createFromFontInfo(TypefaceCompatApi21Impl.java:72)
at android.support.v4.graphics.TypefaceCompat.createFromFontInfo(TypefaceCompat.java:167)
at android.support.v4.provider.FontsContractCompat.getFontInternal(FontsContractCompat.java:190)
at android.support.v4.provider.FontsContractCompat.getFontSync(FontsContractCompat.java:244)
at android.support.v4.graphics.TypefaceCompat.createFromResourcesFamilyXml(TypefaceCompat.java:124)
at android.support.v4.content.res.ResourcesCompat.loadFont(ResourcesCompat.java:390)
at android.support.v4.content.res.ResourcesCompat.loadFont(ResourcesCompat.java:336)
at android.support.v4.content.res.ResourcesCompat.getFont(ResourcesCompat.java:205)
at com.example.libs.widget.view.MandatoryEditTextView.initialize(MandatoryEditTextView.java:179)
at com.example.libs.widget.view.MandatoryEditTextView.init(MandatoryEditTextView.java:120)
at com.example.libs.widget.view.MandatoryEditTextView.(MandatoryEditTextView.java:98)
... 30 more
I noticed in the report videos that those crashes are occurring in the first screens of the app but when i run the app myself on an emulator or a real device (Oreo or pre Oreo) this crashes dont happen.
Also, as a side note, but i think its related, i've been trying to use
<meta-data android:name="preloaded_fonts"
android:resource="#array/preloaded_fonts" />
in AndroidManifest.xml but it doesnt seem to work at all. when trying to access a font, either via xml or by code, the app crashes because the font isnt being recognized. So i decided eventually to remove this meta-data.
Help is appreciated.

Android Preference persistString method is getting java.lang.ClassCastException error

I'm trying to do TimePickerPreferences and I tried accepted answer and second answer in the question. And I got following error when I call persistString(time) function at onDialogClosed
FATAL EXCEPTION: main
Process: com.foo.example, PID: 29414
java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.String
at android.app.SharedPreferencesImpl.getString(SharedPreferencesImpl.java:225)
at android.preference.Preference.getPersistedString(Preference.java:1472)
at android.preference.Preference.persistString(Preference.java:1441)
at com.foo.example.ui.preferences.TimePreference.onDialogClosed(TimePreference.java:60)
at android.preference.DialogPreference.onDismiss(DialogPreference.java:395)
at android.app.Dialog$ListenersHandler.handleMessage(Dialog.java:1323)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

An app using zbar library for scanning QR codes is getting crash.

I am trying to run the QR scanner app downloaded from
http://kvenkataprasad.blogspot.in/2015/01/bar-code-and-qr-code-scanner-example.html?showComment=1449051540990#c226949441944394510
App getting started but when I am clicking the scan button, the app get crashed.
Following the log of crash.
13239-13239/com.kvprasad.zbarbarcodescanner E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.kvprasad.zbarbarcodescanner, PID: 13239
java.lang.UnsatisfiedLinkError: dlopen failed: /data/app/com.kvprasad.zbarbarcodescanner-1/lib/arm/libzbarjni.so: has text relocations
at java.lang.Runtime.loadLibrary(Runtime.java:372)
at java.lang.System.loadLibrary(System.java:1076)
at net.sourceforge.zbar.ImageScanner.<clinit>(Unknown Source)
at com.kvprasad.zbarbarcodescanner.BarcodeScanner.initControls(BarcodeScanner.java:52)
at com.kvprasad.zbarbarcodescanner.BarcodeScanner.onCreate(BarcodeScanner.java:42)
at android.app.Activity.performCreate(Activity.java:6237)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
I am not getting the main issue behind crashing because I am a newbie in android. Please guide me to solve the problem.
Thanks.