Develop Reference

Get error when back to the previous activity in intent

In My app When I go to the settings activity then back, my app force to stop the activity, I don't know which mistake is there.Please help me to solve that. Thanks for your help in advance!
08-13 11:36:36.355 21968-21968/com.example.user.dictationapp E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.user.dictationapp, PID: 21968
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.user.dictationapp/com.example.user.dictationapp.DictationVocab}: java.lang.ClassCastException: android.view.AbsSavedState$1 cannot be cast to android.widget.CompoundButton$SavedState
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2202)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2252)
at android.app.ActivityThread.access$800(ActivityThread.java:139)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1200)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5103)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:606)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.ClassCastException: android.view.AbsSavedState$1 cannot be cast to android.widget.CompoundButton$SavedState
at android.widget.CompoundButton.onRestoreInstanceState(CompoundButton.java:378)
at android.view.View.dispatchRestoreInstanceState(View.java:12842)
at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:2658)
at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:2658)
at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:2658)
at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:2658)
at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:2658)
at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:2658)
at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:2658)
at android.view.View.restoreHierarchyState(View.java:12820)
at com.android.internal.policy.impl.PhoneWindow.restoreHierarchyState(PhoneWindow.java:1874)
at android.app.Activity.onRestoreInstanceState(Activity.java:949)
at android.app.Activity.performRestoreInstanceState(Activity.java:921)
at android.app.Instrumentation.callActivityOnRestoreInstanceState(Instrumentation.java:1138)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2252)
at android.app.ActivityThread.access$800(ActivityThread.java:139)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1200)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5103)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:606)
at dalvik.system.NativeStart.main(Native Method)

android.view.AbsSavedState$1 cannot be cast to android.widget.CompoundButton$SavedState
Having experienced these ClassCastExceptions before, I'd suggest that you check that you do not have a same id being shared by different widgets. Also, check with layouts in different layout-qualifiers folders for the same condition.

App crashing on particular Android version

I am working on an Android application. when I run my App below api 16 it works fine but when it runs on a post api 16 phone it crashes. Here is a the logact log which appears when it crashes.
06-19 20:20:05.096 5812-5812/com.ets.medecord W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0x42011898)
06-19 20:20:05.106 5812-5812/com.ets.medecord E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.ets.medecord/com.ets.medecord.SignupActivity2}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2218)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2268)
at android.app.ActivityThread.access$600(ActivityThread.java:148)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1263)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5162)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:756)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:572)
at miui.dexspy.DexspyInstaller.main(DexspyInstaller.java:171)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at com.ets.medecord.SignupActivity2.onCreate(SignupActivity2.java:72)
at android.app.Activity.performCreate(Activity.java:5135)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
at com.lbe.security.service.core.client.b.x.callActivityOnCreate(Unknown Source)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2182)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2268)
            at android.app.ActivityThread.access$600(ActivityThread.java:148)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1263)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:5162)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:525)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:756)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:572)
            at miui.dexspy.DexspyInstaller.main(DexspyInstaller.java:171)
            at dalvik.system.NativeStart.main(Native Method)
To see code of the activity you can checkout this gist https://gist.github.com/darthvish/873dc292c841e5c86312

As you are using some deprecated features, so it may not supported for some API levels. For this you can check the api level as well as version before using the deprecated features using if condition. For example :
if(Build.VERSION.RELEASE.equals("4.4.4")) {
//Do somthing
}

Unable to start activity NullPointerException-onActivityCreated

My App crash rarely
i want to get off this bug for ever.
this is the log that users Report
i tried so long on this but nothing helps
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.xxx.xxx/com.xxx.xxx.Master_}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2072)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2097)
at android.app.ActivityThread.access$600(ActivityThread.java:136)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1207)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4787)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:556)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at com.xxx.xxx.HomeFragment.onActivityCreated(HomeFragment.java:140)
at android.support.v4.app.Fragment.performActivityCreated(Fragment.java:1508)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:958)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1115)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1097)
at android.support.v4.app.FragmentManagerImpl.dispatchActivityCreated(FragmentManager.java:1895)
at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:566)
at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1163)
at android.app.Activity.performStart(Activity.java:5018)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2045)
... 11 more

Android app crashing after push notification is received while running in background

I'm developing an app with titanium but when I test it on android it crashes occasionally when receiving push notifications in background. On the iOS version this is not causing any problem.
I'm using an Android with 4.4.2 version installed and Titanium SDK 3.4.0
Here's the crash report:
java.lang.RuntimeException: Unable to start activity ComponentInfo{de.hitabis.elsa.mobile/org.appcelerator.titanium.TiActivity}: android.support.v4.app.Fragment$InstantiationException: Unable to instantiate fragment ti.modules.titanium.ui.widget.tabgroup.TiUIActionBarTab$TabFragment: make sure class name exists, is public, and has an empty constructor that is public
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2596)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2653)
at android.app.ActivityThread.access$800(ActivityThread.java:156)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1355)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:157)
at android.app.ActivityThread.main(ActivityThread.java:5872)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:674)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.support.v4.app.Fragment$InstantiationException: Unable to instantiate fragment ti.modules.titanium.ui.widget.tabgroup.TiUIActionBarTab$TabFragment: make sure class name exists, is public, and has an empty constructor that is public
at android.support.v4.app.Fragment.instantiate(Fragment.java:413)
at android.support.v4.app.FragmentState.instantiate(Fragment.java:97)
at android.support.v4.app.FragmentManagerImpl.restoreAllState(FragmentManager.java:1801)
at android.support.v4.app.FragmentActivity.onCreate(FragmentActivity.java:213)
at android.support.v7.app.ActionBarActivity.onCreate(ActionBarActivity.java:97)
at org.appcelerator.titanium.TiBaseActivity.onCreate(TiBaseActivity.java:473)
at org.appcelerator.titanium.TiActivity.onCreate(TiActivity.java:18)
at android.app.Activity.performCreate(Activity.java:5312)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1111)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2552)
... 11 more
Caused by: java.lang.InstantiationException: can't instantiate class ti.modules.titanium.ui.widget.tabgroup.TiUIActionBarTab$TabFragment; no empty constructor
at java.lang.Class.newInstanceImpl(Native Method)
at java.lang.Class.newInstance(Class.java:1208)
at android.support.v4.app.Fragment.instantiate(Fragment.java:402)
... 20 more

Android Studio AVD Emulator non-watch error

I am trying my hand at developing simple apps with the Android Studio and I cannot seem to run even the default app with a blank activity containing the string "Hello World". When I try and run a device on a running Emulator, it gives me an error message and says it the app is not compatible on a watch. I don't know why it would think the emulator is a watch, but I don't know why I cannot emulate an app without changing anything manifest on the simplest AVD provided. Here is an image of the compatibility http://imgur.com/DEWoaON
08-26 16:09:16.500 733-733/com.example.mac.trial3 E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.example.mac.trial3, PID: 733
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.mac.trial3/com.example.mac.trial3.MyActivity}: android.util.AndroidRuntimeException: You cannot combine swipe dismissal and the action bar.
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2197)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2258)
at android.app.ActivityThread.access$800(ActivityThread.java:138)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1209)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5026)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.util.AndroidRuntimeException: You cannot combine swipe dismissal and the action bar.
at com.android.internal.policy.impl.PhoneWindow.requestFeature(PhoneWindow.java:275)
at com.android.internal.policy.impl.PhoneWindow.generateLayout(PhoneWindow.java:2872)
at com.android.internal.policy.impl.PhoneWindow.installDecor(PhoneWindow.java:3129)
at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:303)
at android.app.Activity.setContentView(Activity.java:1930)
at com.example.mac.trial3.MyActivity.onCreate(MyActivity.java:14)
at android.app.Activity.performCreate(Activity.java:5242)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2161)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2258)
            at android.app.ActivityThread.access$800(ActivityThread.java:138)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1209)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5026)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602)
            at dalvik.system.NativeStart.main(Native Method)