Throwing error when RecyclerView is added to xml layout file in Android -
i developing android application. trying use recyclerview in application. added recyclerxml layout file. when run app, throwing error. please see scenario below.
this main_activity xml
<?xml version="1.0" encoding="utf-8"?> <android.support.design.widget.coordinatorlayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:fitssystemwindows="true" tools:context=".mainactivity"> <android.support.design.widget.appbarlayout android:id="@+id/htab_appbar" android:layout_width="match_parent" android:layout_height="wrap_content" android:fitssystemwindows="true" android:theme="@style/themeoverlay.appcompat.dark.actionbar"> <android.support.design.widget.collapsingtoolbarlayout android:id="@+id/htab_collapse_toolbar" android:layout_width="match_parent" android:layout_height="@dimen/main_activity_parallax_initial_height" android:fitssystemwindows="true" app:contentscrim="?attr/colorprimary" app:layout_scrollflags="scroll|exituntilcollapsed"> <relativelayout android:layout_width="match_parent" android:layout_height="wrap_content"> <imageview android:id="@+id/htab_header" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@drawable/apple" android:fitssystemwindows="true" android:scaletype="centercrop" app:layout_collapsemode="parallax" /> <textview android:layout_centerinparent="true" android:text="hello" android:textsize="20dp" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </relativelayout> <android.support.v7.widget.toolbar android:id="@+id/htab_toolbar" android:layout_width="match_parent" android:layout_height="@dimen/main_activity_toolbar_height" android:gravity="top" android:minheight="?attr/actionbarsize" app:layout_collapsemode="pin" app:popuptheme="@style/themeoverlay.appcompat.light" app:titlemargintop="13dp" /> <!-- <android.support.design.widget.tablayout android:id="@+id/htab_tabs" android:layout_width="match_parent" android:layout_height="?attr/actionbarsize" android:layout_gravity="bottom" app:tabindicatorcolor="@android:color/white" />--> </android.support.design.widget.collapsingtoolbarlayout> </android.support.design.widget.appbarlayout> <framelayout android:id="@+id/default_content_container" android:layout_width="match_parent" android:layout_height="wrap_content"></framelayout> </android.support.design.widget.coordinatorlayout> then set content of default_content_container fragment.
this xml of fragment recycler view
<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <android.support.v7.widget.recyclerview android:id="@+id/dc_rv_destination" android:scrollbars="vertical" android:layout_width="match_parent" android:layout_height="wrap_content"/> </linearlayout> i did not initialize , nothing in fragment.
but when run, giving me error.
05-28 14:42:15.956 8654-8654/com.deltatripagent.deltatripagent w/egl_genymotion: eglsurfaceattrib not implemented 05-28 14:42:15.956 8654-8654/com.deltatripagent.deltatripagent e/openglrenderer: getting max_texture_size gradiencache 05-28 14:42:15.956 8654-8654/com.deltatripagent.deltatripagent e/openglrenderer: getting max_texture_size caches::initconstraints() 05-28 14:42:15.960 8654-8654/com.deltatripagent.deltatripagent d/openglrenderer: enabling debug mode 0 05-28 14:42:15.960 8654-8654/com.deltatripagent.deltatripagent e/recyclerview: no adapter attached; skipping layout 05-28 14:42:15.964 8654-8654/com.deltatripagent.deltatripagent d/androidruntime: shutting down vm 05-28 14:42:15.964 8654-8654/com.deltatripagent.deltatripagent w/dalvikvm: threadid=1: thread exiting uncaught exception (group=0xa4bc9648) 05-28 14:42:15.964 8654-8654/com.deltatripagent.deltatripagent w/viewrootimpl: dropping event due no window focus: keyevent { action=action_down, keycode=keycode_alt_right, scancode=100, metastate=meta_alt_on|meta_alt_right_on, flags=0x8, repeatcount=25349, eventtime=1585081, downtime=277306, deviceid=1, source=0x301 } 05-28 14:42:15.964 8654-8654/com.deltatripagent.deltatripagent w/viewrootimpl: dropping event due no window focus: keyevent { action=action_down, keycode=keycode_alt_right, scancode=100, metastate=meta_alt_on|meta_alt_right_on, flags=0x8, repeatcount=25350, eventtime=1585450, downtime=277306, deviceid=1, source=0x301 } 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: fatal exception: main 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: java.lang.nullpointerexception 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.support.v7.widget.recyclerview.computeverticalscrollrange(recyclerview.java:1654) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.view.ondrawscrollbars(view.java:11596) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.view.draw(view.java:13950) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.support.v7.widget.recyclerview.draw(recyclerview.java:3097) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.view.getdisplaylist(view.java:12838) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.view.getdisplaylist(view.java:12880) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.view.draw(view.java:13657) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.viewgroup.drawchild(viewgroup.java:3086) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.viewgroup.dispatchdraw(viewgroup.java:2923) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.view.getdisplaylist(view.java:12833) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.view.getdisplaylist(view.java:12880) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.view.draw(view.java:13657) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.viewgroup.drawchild(viewgroup.java:3086) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.viewgroup.dispatchdraw(viewgroup.java:2923) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.view.getdisplaylist(view.java:12833) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.view.getdisplaylist(view.java:12880) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.view.draw(view.java:13657) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.viewgroup.drawchild(viewgroup.java:3086) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.support.design.widget.coordinatorlayout.drawchild(coordinatorlayout.java:1077) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.viewgroup.dispatchdraw(viewgroup.java:2923) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.view.getdisplaylist(view.java:12833) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.view.getdisplaylist(view.java:12880) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.view.draw(view.java:13657) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.viewgroup.drawchild(viewgroup.java:3086) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.viewgroup.dispatchdraw(viewgroup.java:2923) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.view.draw(view.java:13947) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.widget.framelayout.draw(framelayout.java:467) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.view.getdisplaylist(view.java:12838) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.view.getdisplaylist(view.java:12880) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.view.draw(view.java:13657) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.viewgroup.drawchild(viewgroup.java:3086) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.viewgroup.dispatchdraw(viewgroup.java:2923) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.view.getdisplaylist(view.java:12833) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.view.getdisplaylist(view.java:12880) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.view.draw(view.java:13657) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.viewgroup.drawchild(viewgroup.java:3086) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.viewgroup.dispatchdraw(viewgroup.java:2923) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.view.getdisplaylist(view.java:12833) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.view.getdisplaylist(view.java:12880) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.view.draw(view.java:13657) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.viewgroup.drawchild(viewgroup.java:3086) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.viewgroup.dispatchdraw(viewgroup.java:2923) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.view.getdisplaylist(view.java:12833) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.view.getdisplaylist(view.java:12880) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.view.draw(view.java:13657) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.viewgroup.drawchild(viewgroup.java:3086) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.viewgroup.dispatchdraw(viewgroup.java:2923) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.view.draw(view.java:13947) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.widget.framelayout.draw(framelayout.java:467) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ com.android.internal.policy.impl.phonewindow$decorview.draw(phonewindow.java:2224) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.view.getdisplaylist(view.java:12838) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.view.getdisplaylist(view.java:12880) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.hardwarerenderer$glrenderer.builddisplaylist(hardwarerenderer.java:1411) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.hardwarerenderer$glrenderer.draw(hardwarerenderer.java:1359) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.viewrootimpl.draw(viewrootimpl.java:2367) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.viewrootimpl.performdraw(viewrootimpl.java:2239) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.viewrootimpl.performtraversals(viewrootimpl.java:1872) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.viewrootimpl.dotraversal(viewrootimpl.java:1004) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.viewrootimpl$traversalrunnable.run(viewrootimpl.java:5481) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.choreographer$callbackrecord.run(choreographer.java:749) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.choreographer.docallbacks(choreographer.java:562) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.choreographer.doframe(choreographer.java:532) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.view.choreographer$framedisplayeventreceiver.run(choreographer.java:735) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.os.handler.handlecallback(handler.java:730) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.os.handler.dispatchmessage(handler.java:92) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.os.looper.loop(looper.java:137) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ android.app.activitythread.main(activitythread.java:5103) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ java.lang.reflect.method.invokenative(native method) 05-28 14:42:15.968 8654-8654/com.deltatripagent.deltatripagent e/androidruntime: @ java.la so please why cannot add recycler view? when add list view instead, can run app. please how can fix that? please me.
that happens because "did not initialize , nothing in fragment."
recyclerview must be initialised view layoutmanager after being inflated.
that happens because lot of layout calculation recycleview happens in layoutmanager.
that said, simple fix, after inflating fragment layout, during fragment oncreateview add layout manager via:
recycler.setlayoutmanager( /* add here layout manager of choice */ );
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