ExpandableListView -UnsupportedOperationException: addView(View, LayoutParams) is not supported in AdapterView
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02-06-2021 - |
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>
Solution
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.
OTHER TIPS
Note that you can also get this error when your layout xml is invalid.
As were noted above,
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.
According to Android Lint your child view should always provide a reference to its parent view when inflated. I had the exact same error in my code. Is was occurring because the TextView was placed inside the ExpandableListView. When I rearranged my xml layout the error stopped appearing.
This error can also be caused because of instant run feature. I was working on listview and because of this error app kept crashing. Uninstalling the app and running again resolved the error.