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

Question

I am implementing Expandable List view in android and i am getting the above titled error. Please help me.

Main activity is -

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);     }   } 

ExpAdapter class is - I have implemented the adapter in other class and have called it in mt main activity

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;         }         } 

main.xml-

this is the xnl that is displayed at the first by the main activity

  <?xml version="1.0" encoding="utf-8"?>     <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"         android:layout_width="fill_parent"         android:layout_height="fill_parent"         android:orientation="vertical" >            <ExpandableListView              android:id="@+id/expandList1"             android:layout_width="fill_parent"             android:layout_height="fill_parent"             >                    <TextView                  android:id="@+id/android:empty"                 android:layout_width="fill_parent"                 android:layout_height="fill_parent"                 >             </TextView>           </ExpandableListView>       </LinearLayout> 

group_row.xml

this is the xml for the group elements

 <?xml version="1.0" encoding="utf-8"?>     <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" >           <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"             />      </LinearLayout> 

child_row.xml this is the xml for the child elements

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="fill_parent"     android:layout_height="40dp"     android:orientation="horizontal" >      <TextView         android:id="@+id/rowValues"         android:layout_width="wrap_content"         android:layout_height="30dp"         android:gravity="center_vertical"         android:paddingLeft="50dp"         android:textSize="12dp" />   </LinearLayout> 

Answer 1

Seems like Adapterview does not allow adding new view, I encountered same problem

Solve it by replacing following line

convertView  = inflator.inflate(R.layout.child_rows, parent); 

to

convertView  = inflator.inflate(R.layout.child_rows, null); 

UPDATE

Instead of not using a parent at all, you should simply tell the Inflater not to attach the inflated view to the parent with

convertView = inflator.inflate(R.layout.child_rows, parent, false);  

See also this answer.

The reason is that adapter takes care of attaching views to parent itself.

Answer 2

Note that you can also get this error when your layout xml is invalid.