android - Getting java.lang.NullPointerException On simply populating spinner from string array or list or xml file(strings.xml) -
i want populate spinner through string array or through xml file(strings.xml). getting java.lang.nullpointerexception: error. have searched lot on google worthless. have tried below.
secondactivity.java
package com.example.android02.personalityinsight; import android.os.bundle; import android.support.design.widget.tablayout; import android.support.v4.app.fragment; import android.support.v4.app.fragmentmanager; import android.support.v4.app.fragmentstatepageradapter; import android.support.v4.view.viewpager; import android.support.v7.app.appcompatactivity; import android.view.view; import android.widget.arrayadapter; import android.widget.button; import android.widget.spinner; public class secondactivity extends appcompatactivity implements view.onclicklistener { tablayout tabs; viewpager viewpager; mypageradapter pageradapter; spinner sp1, sp2; @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.activity_second); // string colors[] = {"red", "blue", "white", "yellow", "black", "green", "purple", "orange", "grey"}; // sp1 = (spinner) findviewbyid(r.id.sp1); // // arrayadapter<string> spinnerarrayadapter = new arrayadapter<string>(this, android.r.layout.simple_spinner_item, colors); // spinnerarrayadapter.setdropdownviewresource(android.r.layout.simple_spinner_dropdown_item); // sp1.setadapter(spinnerarrayadapter); sp2 = (spinner) findviewbyid(r.id.sp2); arrayadapter<charsequence> adapter = arrayadapter.createfromresource( this, r.array.ans, android.r.layout.simple_spinner_item); adapter.setdropdownviewresource(android.r.layout.simple_spinner_dropdown_item); sp2.setadapter(adapter); tabs = (tablayout) findviewbyid(r.id.tabs); viewpager = (viewpager) findviewbyid(r.id.viewpager); submit = (button) findviewbyid(r.id.btn_submit); tabs.addtab(tabs.newtab().settext("personality insights")); tabs.addtab(tabs.newtab().settext("quiz")); tabs.addtab(tabs.newtab().settext("pi v/s quiz")); pageradapter = new mypageradapter(getsupportfragmentmanager(), tabs.gettabcount()); viewpager.setadapter(pageradapter); tabs.settabsfrompageradapter(pageradapter); tabs.setupwithviewpager(viewpager); } @override public void onclick(view v) { switch (v.getid()) { case r.id.btn_submit: break; default: } } private class mypageradapter extends fragmentstatepageradapter { int mnumoftabs; public mypageradapter(fragmentmanager fm, int mnumoftabs) { super(fm); this.mnumoftabs = mnumoftabs; } public mypageradapter(fragmentmanager fm) { super(fm); } @override public fragment getitem(int position) { switch (position) { case 0: return tabone_fragment.newinstance(); case 1: return tantwo_fragment.newinstance(); case 2: return tabthree_fragment.newinstance(); default: return tabone_fragment.newinstance(); } } @override public int getcount() { return mnumoftabs; } } } tabtwo_fragment.xml
<?xml version="1.0" encoding="utf-8"?> <relativelayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:padding="10dp"> <tablelayout android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center_horizontal"> <tablerow android:id="@+id/row1" android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center_vertical"> <textview android:id="@+id/q1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:gravity="center" android:padding="6dp" android:text="sitting , reading: " android:textappearance="?android:attr/textappearance" /> <spinner android:id="@+id/sp1" android:layout_width="wrap_content" android:layout_height="wrap_content"></spinner> </tablerow> <tablerow android:id="@+id/row2" android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center_vertical"> <textview android:id="@+id/q2" android:layout_width="250dp" android:layout_height="wrap_content" android:gravity="center" android:padding="6dp" android:text="sitting, inactive in public place (e.g. theatre or meeting): " android:textappearance="?android:attr/textappearance" /> <spinner android:id="@+id/sp2" android:layout_width="wrap_content" android:layout_height="wrap_content"></spinner> </tablerow> </tablelayout> </relativelayout> strings.xml
<resources> <string name="app_name">personalityinsight</string> <!-- custom --> <string name="facebook_app_id">xxxxxxxxxxxxxxxx</string> <string-array name="ans"> <item>zero</item> <item>one</item> <item>two</item> <item>three</item> </string-array> </resources> however getting error @ line sp2.setadapter(adapter); no matter filling spinner array or xml file. have tried filling spinner list same error occurred.
thanks in advance.
the error says adapter null.
try change adapter initialise adapter this:
arrayadapter<charsequence> adapter = new arrayadapter<charsequence>(this, android.r.layout.simple_spinner_item, r.array.ans); edit
actually know what, why not in xml file instead, this:
<spinner android:id="@+id/sp1" android:layout_width="match_parent" android:layout_height="wrap_content" android:spinnermode="dropdown" android:entries="@array/ans" android:prompt="@string/select_one"/> edit2
since prefer programmatically, try:
arrayadapter<string> adapter = new arrayadapter<string>(this, android.r.layout.simple_spinner_item, getresources().getstringarray(r.array.ans)); adapter.setdropdownviewresource(android.r.layout.simple_spinner_dropdown_item); sp2.setadapter(adapter); r.array.anschangedgetresources().getstringarray(r.array.ans)
hope helps.
Comments
Post a Comment