java.lang.RuntimeException: Unable to start activity ComponentInfo{com.wenming.weiswift/com.wenming.weiswift.ui.login.activity.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.support.v7.widget.RecyclerView.getChildCount()' on a null object reference

Searched on Google with the first line of a JAVA stack trace?

We can recommend more relevant solutions and speed up debugging when you paste your entire stack trace with the exception message. Try a sample exception.

Recommended solutions based on your search

Solutions on the web

via GitHub by wenmingvs
, 1 year ago
Unable to start activity ComponentInfo{com.wenming.weiswift/com.wenming.weiswift.ui.login.activity.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.support.v7.widget.RecyclerView.getChildCount()' on a null object reference
via GitHub by BishopGIS
, 1 year ago
Unable to start activity ComponentInfo{com.nextgis.mobile/com.nextgis.maplibui.activity.VectorLayerSettingsActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.util.Map com.nextgis.maplib.display.FieldStyleRule.getStyleRules()' on a null object reference
via GitHub by DavidEdwards
, 1 year ago
Unable to start activity ComponentInfo{com.package.name/com.google.android.libraries.cast.companionlibrary.cast.player.VideoCastControllerActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'int com.google.android.gms.cast.ah.k()' on a null object reference
via Stack Overflow by CBA110
, 1 year ago
Unable to start activity ComponentInfo{uk.co.my_package.weatherscan/uk.co.my_package.weatherscan.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.widget.LinearLayoutManager.onRestoreInstanceState(android.os.Parcelable)' on a null object reference
via GitHub by misaochan
, 2 months ago
Unable to start activity ComponentInfo{fr.free.nrw.commons/fr.free.nrw.commons.contributions.ContributionsActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.app.ActionBar.setDisplayHomeAsUpEnabled(boolean)' on a null object reference
via GitHub by mvysny
, 1 year ago
Unable to start activity ComponentInfo{sk.baka.aedict3/sk.baka.aedict3.EdictEntryDetailActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.view.View.findViewById(int)' on a null object reference
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.wenming.weiswift/com.wenming.weiswift.ui.login.activity.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.support.v7.widget.RecyclerView.getChildCount()' on a null object reference
at com.wenming.weiswift.ui.login.activity.MainActivity.showHomeFragment(MainActivity.java:254)
at com.wenming.weiswift.ui.login.activity.MainActivity.switchToFragment(MainActivity.java:216)
at com.wenming.weiswift.ui.login.activity.MainActivity.restoreFragment(MainActivity.java:148)
at com.wenming.weiswift.ui.login.activity.MainActivity.onCreate(MainActivity.java:125)
at android.app.Activity.performCreate(Activity.java:6876)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1135)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3206)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3349)
at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:5382)
at android.app.ActivityThread.access$1200(ActivityThread.java:221)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1800)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7224)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:134)

Users with the same issue

You are the first who have seen this exception. Write a tip to help other users and build your expert profile.

Know the solutions? Share your knowledge to help other developers to debug faster.