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ultramega / elementary

Elementary is a simple Periodic Table and element reference application for Android.
MIT License
55 stars 16 forks source link

Attempt to invoke interface method 'boolean android.content.SharedPreferences.getBoolean(java.lang.String, boolean)' on a null object reference #45

Closed yogajiwanjaya closed 3 years ago

yogajiwanjaya commented 3 years ago

I tried to make this application, but after I copied the file to my project there was a problem that appeared like this

E/AndroidRuntime: FATAL EXCEPTION: main Process: com.edulab.ipa_sma, PID: 23364 java.lang.RuntimeException: Unable to start activity ComponentInfo{ /.PeriodicTableActivity}: java.lang.NullPointerException: Attempt to invoke interface method 'boolean android.content.SharedPreferences.getBoolean(java.lang.String, boolean)' on a null object reference at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3556) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3703) at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83) at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135) at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2216) at android.os.Handler.dispatchMessage(Handler.java:107) at android.os.Looper.loop(Looper.java:237) at android.app.ActivityThread.main(ActivityThread.java:7948) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1075) Caused by: java.lang.NullPointerException: Attempt to invoke interface method 'boolean android.content.SharedPreferences.getBoolean(java.lang.String, boolean)' on a null object reference at com.edulab.ipa_sma.util.PreferenceUtils.getPrefDarkTheme(PreferenceUtils.java:83) at com.edulab.ipa_sma.PeriodicTableActivity.onCreate(PeriodicTableActivity.java:127) at android.app.Activity.performCreate(Activity.java:7955) at android.app.Activity.performCreate(Activity.java:7944) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1307) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3531) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3703)  at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)  at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)  at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2216)  at android.os.Handler.dispatchMessage(Handler.java:107)  at android.os.Looper.loop(Looper.java:237)  at android.app.ActivityThread.main(ActivityThread.java:7948)  at java.lang.reflect.Method.invoke(Native Method)  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1075) 

iam not modified PreferenceUtils.java and PeriodicTableActivity.java

yogajiwanjaya commented 3 years ago

forgot to add android:name=".ElementaryApplication" in AndroidManifest.xml