react native webview java.lang.NullPointerException - android

Many times to open the WebView, resulting in a number of WebView, it is estimated that the memory leak, I would like to ask a way to solve it?
Shutting down VM
threadid=1: thread exiting with uncaught exception (group=0xa617e908)
uncaughtException java.lang.NullPointerException
java.lang.NullPointerException
at android.webkit.WebViewClassic.loadUrlImpl(WebViewClassic.java:2525)
at android.webkit.WebViewClassic.loadUrlImpl(WebViewClassic.java:2541)
at android.webkit.WebViewClassic.loadUrl(WebViewClassic.java:2534)
at android.webkit.WebView.loadUrl(WebView.java:784)
at cn.nin.common.MyAndroid$MyAsyncTask.onPostExecute(MyAndroid.java:1461)
at cn.nin.common.MyAndroid$MyAsyncTask.onPostExecute(MyAndroid.java:1362)
at android.os.AsyncTask.finish(AsyncTask.java:631)
at android.os.AsyncTask.access$600(AsyncTask.java:177)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5041)
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:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
at dalvik.system.NativeStart.main(Native Method)

You didn't give us enough information. NullPointerException can be thrown for many reasons.That error means that an application attempts to use an object reference that has the null value.

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A strange Exception about notification: ClassCastException: RemoteViews$SetOnClickPendingIntent cannot be cast to RemoteViews$ReflectionAction

I have encounteredd a problem. I collect a exception message about notification for startForeground. It mainly appears on SamSung GT-I9300, API 15. Is there any clue about it ? Expect your fabulous analysis. Thanks
Bad notification for startForeground: java.lang.ClassCastException:
android.widget.RemoteViews$SetOnClickPendingIntent cannot be cast to
android.widget.RemoteViews$ReflectionAction
android.app.ActivityThread$H.handleMessage(ActivityThread.java:1260)
android.os.Handler.dispatchMessage(Handler.java:99)
android.os.Looper.loop(Looper.java:137)
android.app.ActivityThread.main(ActivityThread.java:4424)
java.lang.reflect.Method.invokeNative(Native Method)
java.lang.reflect.Method.invoke(Method.java:511)
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Android weird "divide by zero" exception in ListView

I am using GA to tracking my applications. I have noticed that there is a weird exception reported sometimes on every release. The reported calling stack shows that it seems to be the Android issue of the user's device(I can never reproduce this issue). I tried hard but still cannot find a clue, is there anyone have some experience with this problem?
Thread: main, Exception: java.lang.ArithmeticException: divide by zero
at android.widget.AbsListView$FlingRunnable.run(AbsListView.java:2937)
at android.os.Handler.handleCallback(Handler.java:587)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:123)
at android.app.ActivityThread.main(ActivityThread.java:4627)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:521)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
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NullPointer exception at android.support.v4.app.FragmentManagerImpl.makeInactive

I'm seeing a weird exception in Android Support Library - the stack trace is below. Any ideas what could be causing this? I'm unable to reproduce the exception on any of my devices, but there seem to be quite a few visible in the Google Play DevConsole.
java.lang.NullPointerException
at android.support.v4.app.FragmentManagerImpl.makeInactive(FragmentManager.java:1133)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1044)
at android.support.v4.app.FragmentManagerImpl.removeFragment(FragmentManager.java:1171)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:582)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1416)
at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:420)
at android.os.Handler.handleCallback(Handler.java:608)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:156)
at android.app.ActivityThread.main(ActivityThread.java:5045)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
at dalvik.system.NativeStart.main(Native Method)
try check stack fragments in time rotate screen for example in onResume.

Exception in ActivityThread.setupGraphicsSupport()

I got the exception message from user.
java.lang.NullPointerException
at android.app.ActivityThread.setupGraphicsSupport(ActivityThread.java:3738)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:3808)
at android.app.ActivityThread.access$1300(ActivityThread.java:127)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1197)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4507)
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:790)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557)
at dalvik.system.NativeStart.main(Native Method)
He uses samsung galaxy S2 (ICS 4.0.3 with tegrak kernel and ADW launcher ex)
It's difficult to find what's the problem with this exception log.
Can anybody suggest a starting point to find why this exception raised.
Thanks.

NullPointerException in com.reg.project

I have no Idea why I get this error :/
Exception class java.lang.NullPointerException
Source method Jax$7.onClick()
java.lang.NullPointerException
at com.reg.lolsoundboard.Jax$7.onClick(Jax.java:83)
at android.view.View.performClick(View.java:2485)
at android.view.View$PerformClick.run(View.java:9089)
at android.os.Handler.handleCallback(Handler.java:587)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:123)
at android.app.ActivityThread.main(ActivityThread.java:3806)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
at dalvik.system.NativeStart.main(Native Method)
Obviously you are dereferencing a variable in line 83 of the file Jax.java where the variable is null.
java.lang.NullPointerException
at com.reg.lolsoundboard.Jax$7.onClick(Jax.java:83)
If show the relevant code, people may be able to help you.

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