java.lang.NullPointerException

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  • java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.Resources android.content.Context.getResources()' on a null object reference at com.smartfon_apps.timetable_sch32.Db$DbHelper.onCreate(Db.java:68) at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:251) at android.database.sqlite.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:187) at com.smartfon_apps.timetable_sch32.Db.getAllItems(Db.java:38) at com.smartfon_apps.timetable_sch32.MondayFragment.onCreateView(MondayFragment.java:33) at android.support.v4.app.Fragment.performCreateView(Fragment.java:2074) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1286) at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:758) at android.support.v4.app.FragmentManagerImpl.execSingleAction(FragmentManager.java:1632) at android.support.v4.app.BackStackRecord.commitNowAllowingStateLoss(BackStackRecord.java:637) at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:143) at android.support.v4.view.ViewPager.populate(ViewPager.java:1237) at android.support.v4.view.ViewPager.populate(ViewPager.java:1085) at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1611) at android.view.View.measure(View.java:17496) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5466) at android.support.design.widget.CoordinatorLayout.onMeasureChild(CoordinatorLayout.java:671) at android.support.design.widget.HeaderScrollingViewBehavior.onMeasureChild(HeaderScrollingViewBehavior.java:90) at android.support.design.widget.AppBarLayout$ScrollingViewBehavior.onMeasureChild(AppBarLayout.java:1319) at android.support.design.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:736) at android.view.View.measure(View.java:17496) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5466) at android.widget.FrameLayout.onMeasure(FrameLayout.java:430) at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:135) at android.view.View.measure(View.java:17496) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5466) at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1438) at android.widget.LinearLayout.measureVertical(LinearLayout.java:724) at android.widget.LinearLayout.onMeasure(LinearLayout.java:615) at android.view.View.measure(View.java:17496) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5466) at android.widget.FrameLayout.onMeasure(FrameLayout.java:430) at android.view.View.measure(View.java:17496) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5466) at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1438) at android.widget.LinearLayout.measureVertical(LinearLayout.java:724) at android.widget.LinearLayout.onMeasure(LinearLayout.java:615) at android.view.View.measure(View.java:17496) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5466) at android.widget.FrameLayout.onMeasure(FrameLayout.java:430) at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2636) at android.view.View.measure(View.java:17496) at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2031) at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1193) at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1400) at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1078) at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5875) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767) at android.view.Choreographer.doCallbacks(Choreographer.java:580) at android.view.Choreographer.doFrame(Choreographer.java:550)
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