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POExpandableListView -UnsupportedOperationException: addView(View, LayoutParams) is not supported in AdapterView
 

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  1. POExpandableListView -UnsupportedOperationException: addView(View, LayoutParams) is not supported in AdapterView
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    <p>I am implementing Expandable List view in android and i am getting the above titled error. Please help me.</p> <p>Main activity is - </p> <pre><code>package com.expand; import android.app.Activity; import android.os.Bundle; import android.util.DisplayMetrics; import android.util.Log; import android.view.View; import android.widget.ExpandableListView; import android.widget.Toast; public class MyExpandableListViewActivity extends Activity { /** Called when the activity is first created. */ static final String groupElements[]= { "India", "Australia", "England", "South Africa" }; static final String[][] childElements= { { "Sachin Tendulkar", "Raina", "Dhoni", "Yuvi" }, { "Ponting", "Adam Gilchrist", "Michael Clarke" }, { "Andrew Strauss", "kevin Peterson", "Nasser Hussain" }, { "Graeme Smith", "AB de villiers", "Jacques Kallis" } }; DisplayMetrics metrics; int width; ExpandableListView expandList; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); expandList = (ExpandableListView)findViewById(R.id.expandList1); metrics = new DisplayMetrics(); getWindowManager().getDefaultDisplay().getMetrics(metrics); width = metrics.widthPixels; //ExpAdapter adapter = new ExpAdapter(MyExpandableListViewActivity.this, groupElements, childElements); expandList.setAdapter(new ExpAdapter(MyExpandableListViewActivity.this, groupElements, childElements)); expandList.setIndicatorBounds(width - GetDipsFromPixel(50), width - GetDipsFromPixel(10)); expandList.setOnGroupExpandListener(new ExpandableListView.OnGroupExpandListener() { @Override public void onGroupExpand(int groupPosition) { // TODO Auto-generated method stub Log.e("onGroupExpand", "OK"); } }); expandList.setOnGroupCollapseListener(new ExpandableListView.OnGroupCollapseListener() { @Override public void onGroupCollapse(int groupPosition) { // TODO Auto-generated method stub Log.e("onGroupCollapse", "OK"); } }); expandList.setOnChildClickListener(new ExpandableListView.OnChildClickListener() { @Override public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) { //getting the item that is selected //String s = (String) expandList.getItemAtPosition((int) id); Toast.makeText(MyExpandableListViewActivity.this, "You have selected :" , Toast.LENGTH_SHORT).show(); return false; } }); } public int GetDipsFromPixel(float pixels) { // Get the screen's density scale final float scale = getResources().getDisplayMetrics().density; // Convert the dps to pixels, based on density scale return (int) (pixels * scale + 0.5f); } } </code></pre> <p>ExpAdapter class is - I have implemented the adapter in other class and have called it in mt main activity</p> <pre><code>package com.expand; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseExpandableListAdapter; import android.widget.TextView; public class ExpAdapter extends BaseExpandableListAdapter { public Context myContext; public String[][] childElements; TextView childValues; public String[] groupElements; public ExpAdapter(Context context, String[] group, String[][] childs) { this.myContext=context; this.groupElements = group; this.childElements = childs; } @Override public Object getChild(int groupPosition, int childPosition) { // TODO Auto-generated method stub return childElements[groupPosition][childPosition]; } @Override public long getChildId(int groupPosition, int childPosition) { // TODO Auto-generated method stub return 0; } @Override public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) { // TODO Auto-generated method stub if(convertView==null){ LayoutInflater inflator = (LayoutInflater)myContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE); convertView = inflator.inflate(R.layout.child_rows, parent); } childValues = (TextView)convertView.findViewById(R.id.rowValues); childValues.setText(childElements[groupPosition][childPosition]); return convertView; } @Override public int getChildrenCount(int groupPosition) { // TODO Auto-generated method stub return groupElements[groupPosition].length(); } @Override public Object getGroup(int groupPosition) { // TODO Auto-generated method stub return groupElements[groupPosition]; } @Override public int getGroupCount() { // TODO Auto-generated method stub return groupElements.length; } @Override public long getGroupId(int groupPosition) { // TODO Auto-generated method stub return 0; } @Override public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { // TODO Auto-generated method stub if(convertView==null){ LayoutInflater inflator = (LayoutInflater)myContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE); convertView = inflator.inflate(R.layout.group_rows, null); } TextView group = (TextView)convertView.findViewById(R.id.groupId); group.setText(groupElements[groupPosition]); return convertView; } @Override public boolean hasStableIds() { // TODO Auto-generated method stub return false; } @Override public boolean isChildSelectable(int groupPosition, int childPosition) { // TODO Auto-generated method stub return true; } } </code></pre> <p>main.xml-</p> <p>this is the xnl that is displayed at the first by the main activity</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="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" &gt; &lt;ExpandableListView android:id="@+id/expandList1" android:layout_width="fill_parent" android:layout_height="fill_parent" &gt; &lt;TextView android:id="@+id/android:empty" android:layout_width="fill_parent" android:layout_height="fill_parent" &gt; &lt;/TextView&gt; &lt;/ExpandableListView&gt; &lt;/LinearLayout&gt; </code></pre> <p>group_row.xml</p> <p>this is the xml for the group elements</p> <pre><code> &lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/gropu_name" android:layout_width="fill_parent" android:layout_height="40dp" android:orientation="vertical" &gt; &lt;TextView android:id="@+id/groupId" android:layout_height="40dp" android:layout_width="wrap_content" android:paddingLeft="30dp" android:gravity="center_vertical" android:textSize="16dp" android:textStyle="bold" /&gt; &lt;/LinearLayout&gt; </code></pre> <p>child_row.xml this is the xml for the child elements</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="fill_parent" android:layout_height="40dp" android:orientation="horizontal" &gt; &lt;TextView android:id="@+id/rowValues" android:layout_width="wrap_content" android:layout_height="30dp" android:gravity="center_vertical" android:paddingLeft="50dp" android:textSize="12dp" /&gt; &lt;/LinearLayout&gt; </code></pre>
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