java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.content.Context.getPackageName()' on a null object reference

/*Device Info*/
[硬]设备制造商=Genymotion
[硬]设备型号=Custom
[硬]CPU型号=null
[硬]RAM=1.04 GB
[硬]ROM=13.38 GB
[OS][三方定制系统版本]=Android/vbox86p/vbox86p:8.0.0/OPR6.170623.017/32:userdebug/test-keys
[OS]产品名称(adb shell)=vbox86p
[OS][系统名称]=Android
[OS][Android版本]=8.0.0(26)
[app]versionName=0.2.5-internal.2
[app]versionCode=2
/*Exception*/
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.content.Context.getPackageName()' on a null object reference
    at android.preference.PreferenceManager.getDefaultSharedPreferencesName(PreferenceManager.java:537)
    at android.preference.PreferenceManager.getDefaultSharedPreferences(PreferenceManager.java:526)
    at io.github.TomGarden.tetris.Fragments.LogDialogFragment.<init>(LogDialogFragment.java:35)
    at io.github.TomGarden.tetris.Fragments.SettingPreferenceFragment.onPreferenceClick(SettingPreferenceFragment.java:82)
    at android.preference.Preference.performClick(Preference.java:1136)
    at android.preference.PreferenceScreen.onItemClick(PreferenceScreen.java:249)
    at android.widget.AdapterView.performItemClick(AdapterView.java:318)
    at android.widget.AbsListView.performItemClick(AbsListView.java:1165)
    at android.widget.AbsListView$PerformClick.run(AbsListView.java:3134)
    at android.widget.AbsListView.onTouchUp(AbsListView.java:4061)
    at android.widget.AbsListView.onTouchEvent(AbsListView.java:3820)
    at android.view.View.dispatchTouchEvent(View.java:11721)
    at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2955)
    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2636)
    at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2961)
    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2650)
    at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2961)
    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2650)
    at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2961)
    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2650)
    at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2961)
    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2650)
    at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2961)
    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2650)
    at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2961)
    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2650)
    at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2961)
    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2650)
    at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2961)
    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2650)
    at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2961)
    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2650)
    at com.android.internal.policy.DecorView.superDispatchTouchEvent(DecorView.java:445)
    at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1828)
    at android.app.Activity.dispatchTouchEvent(Activity.java:3292)
    at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:68)
    at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:68)
    at com.android.internal.policy.DecorView.dispatchTouchEvent(DecorView.java:407)
    at android.view.View.dispatchPointerEvent(View.java:11960)
    at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4776)
    at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4590)
    at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4128)
    at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4181)
    at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4147)
    at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4274)
    at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4155)
    at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4331)
    at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4128)
    at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4181)
    at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4147)
    at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4155)
    at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4128)
    at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:6642)
    at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:6616)
    at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:6577)
    at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:6745)
    at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)
    at android.view.InputEventReceiver.nativeConsumeBatchedInputEvents(Native Method)
    at android.view.InputEventReceiver.consumeBatchedInputEvents(InputEventReceiver.java:176)
    at android.view.ViewRootImpl.doConsumeBatchedInput(ViewRootImpl.java:6716)
    at android.view.ViewRootImpl$ConsumeBatchedInputRunnable.run(ViewRootImpl.java:6768)
    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:911)
    at android.view.Choreographer.doCallbacks(Choreographer.java:723)
    at android.view.Choreographer.doFrame(Choreographer.java:652)
    at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:897)
    at android.os.Handler.handleCallback(Handler.java:789)
    at android.os.Handler.dispatchMessage(Handler.java:98)
    at android.os.Looper.loop(Looper.java:164)
    at android.app.ActivityThread.main(ActivityThread.java:6541)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
TomGarden / Tetris

java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.content.Context.getPackageName()' on a null object reference #54
