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POExpandable Listview with fragment
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  1. POExpandable Listview with fragment
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    copied!<p>I got an issue while developing an app in android. I didn't find the solution after doing a lot of searches.</p> <p>An app having two fragment panels.First one, a <code>Fragment</code> showing the list of categories and sub categories where user can select a category or more specifically its sub category. Then its appropriate description will displayed on second fragment.</p> <p>I'm using an expandable <code>view</code> for the category list. But I got an error during run time. </p> <blockquote> <p>System service not available to activities before onCreate()</p> </blockquote> <p>Following are xml and code used in my app</p> <p><strong>activity_main_base.xml</strong></p> <pre><code> &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="top" android:orientation="horizontal" tools:context=".MainBase" &gt; &lt;LinearLayout style="@style/FullscreenActionBarStyle" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="50dp"&gt; &lt;/LinearLayout&gt; &lt;LinearLayout android:id="@+id/categoryfragment" android:layout_width="fill_parent" android:layout_height="fill_parent" /&gt; &lt;/LinearLayout&gt; </code></pre> <p><strong>MainBase.java</strong></p> <pre><code>package my.newapp.x; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentActivity; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentTransaction; public class MainBase extends FragmentActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main_base); Fragment f=new Jobcat(); FragmentManager fm=getSupportFragmentManager(); FragmentTransaction ft=fm.beginTransaction(); ft.add(R.id.categoryfragment,f); ft.commit(); } } </code></pre> <p><strong>catlayout.xml</strong></p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:scrollbars="vertical"&gt; &lt;ExpandableListView android:id="@+id/android:list" android:layout_width="match_parent" android:layout_height="wrap_content" android:childIndicatorRight="30dp" &gt; &lt;/ExpandableListView&gt; &lt;/LinearLayout&gt; </code></pre> <p><strong>jobcat.java</strong></p> <pre><code>package my.newapp.x; import android.os.Bundle; import android.support.v4.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; public class Jobcat extends Fragment { @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View v=inflater.inflate(R.layout.catlayout,container,false); return v; } @Override public void onActivityCreated(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onActivityCreated(savedInstanceState); try{ categoryfill j =new categoryfill(); j.fillme(); } catch(Exception e){ System.out.println("Errrr +++ " + e.getMessage()); } } } </code></pre> <p><strong>categoryfill.java</strong></p> <pre><code>package my.newapp.x; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import android.app.ExpandableListActivity; import android.widget.ExpandableListView; import android.widget.SimpleExpandableListAdapter; public class Jobcategoryfill extends ExpandableListActivity { private SimpleExpandableListAdapter listadapter; ExpandableListView expand; public void fillme() { List&lt;Map&lt;String,String&gt;&gt; category=new ArrayList&lt;Map&lt;String,String&gt;&gt;(); List&lt;List&lt;Map&lt;String, String&gt;&gt;&gt; subcategory=new ArrayList&lt;List&lt;Map&lt;String,String&gt;&gt;&gt;(); Map&lt;String,String&gt; cat1=new HashMap&lt;String, String&gt;(); cat1.put("Parent","A"); category.add(cat1); List&lt;Map&lt;String,String&gt;&gt; sublist1=new ArrayList&lt;Map&lt;String,String&gt;&gt;(); Map&lt;String,String&gt; sub11=new HashMap&lt;String, String&gt;(); sub11.put("child","a1"); sublist1.add(sub11); Map&lt;String,String&gt; sub12=new HashMap&lt;String, String&gt;(); sub12.put("child","a2"); sublist1.add(sub12); Map&lt;String,String&gt; sub13=new HashMap&lt;String, String&gt;(); sub13.put("child","a3"); sublist1.add(sub13); Map&lt;String,String&gt; sub14=new HashMap&lt;String, String&gt;(); sub14.put("child","a4"); sublist1.add(sub14); sublist1.add(sub115); subcategory.add(sublist1); listadapter=new SimpleExpandableListAdapter(this, category, R.layout.categoryparent, new String[] { "Parent" },new int[]{R.id.parentview}, subcategory, R.layout.categorychild, new String[]{"child"},new int[]{R.id.childview}); setListAdapter(listadapter); } } </code></pre> <p>I am unable to find the solution. Pleas anyone help me to resolve this issue or suggest me another method to implement this concept.</p>
 

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