Develop Reference

RecyclerView insert animation breaks OnClick

I am using RecyclerView and new items appear in it only at the top of the list. I want to use default insert animation for this action, but it breaks OnClick() method inside ViewHolder.
If I have inserted new item, OnClick() uses data from the previous item of ArrayList. If I use NotifyDataSetChanged(), data is ok, but of course, there is no animation. Looks like there is problem with ViewHolder.bind() method being not called. How can I update index of every item after NotifyItemInserted(0)?
RecyclerAdapter.java
public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.ViewHolder> {
private Context context;
private LayoutInflater inflater;
private ArrayList<Song> data = new ArrayList<>();
//то, что ниже - для анимации
private static final int UNSELECTED = -1;
private RecyclerView recyclerView;
private int selectedItem = UNSELECTED;
public RecyclerAdapter(Context context, ArrayList<Song> data, RecyclerView recyclerView) {
this.context = context;
inflater = LayoutInflater.from(context);
this.data = data;
this.recyclerView = recyclerView;
}
public void insert(Song song)
{
data.add(0, song);
recyclerView.scrollToPosition(0);
notifyItemInserted(0);
}
public void swap(ArrayList<Song> datas){
data.clear();
data.addAll(datas);
notifyDataSetChanged();
}
public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
TextView tv_songName;
TextView tv_songGenreID;
TextView tv_songUserInfo;
ExpandableLayout expandableLayout;
private CardView expandButton;
private int position;
private TextView youtubeButton;
private TextView shareButton;
public ViewHolder(View itemView) {
super(itemView);
tv_songName = (TextView) itemView.findViewById(R.id.tv_songName);
tv_songGenreID = (TextView) itemView.findViewById(R.id.tv_songGenreID);
tv_songUserInfo = (TextView) itemView.findViewById(R.id.tv_songUserInfo);
youtubeButton = (TextView) itemView.findViewById(R.id.youtube_button);
shareButton = (TextView) itemView.findViewById(R.id.share_button);
expandableLayout = (ExpandableLayout) itemView.findViewById(R.id.expandable_layout);
expandableLayout.setInterpolator(new OvershootInterpolator());
expandButton = (CardView) itemView.findViewById(R.id.card_view);
expandButton.setOnClickListener(this);
youtubeButton.setOnClickListener(this);
shareButton.setOnClickListener(this);
}
public void bind(int position) {
this.position = position;
Song current = data.get(position);
StringBuilder songInfo = new StringBuilder();
songInfo.append(context.getString(R.string.genre));
songInfo.append(current.songGenreID);
songInfo.append(System.getProperty("line.separator"));
songInfo.append(context.getString(R.string.album));
this.tv_songName.setText(current.songName);
this.tv_songGenreID.setText(songInfo);
this.tv_songUserInfo.setText(current.songUserInfo);
expandButton.setSelected(false);
expandableLayout.collapse(false);
}
#Override
public void onClick(View view) {
switch (view.getId())
{
case R.id.youtube_button:
String youtubeURL = data.get(position).songName.replaceAll(" ", "%20");
youtubeURL = "https://www.youtube.com/results?search_query=" + youtubeURL;
Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(youtubeURL));
context.startActivity(browserIntent);
break;
case R.id.share_button:
String songName = data.get(position).songName;
Intent shareIntent = new Intent();
shareIntent.setAction(Intent.ACTION_SEND);
shareIntent.putExtra(Intent.EXTRA_TEXT, songName);
shareIntent.setType("text/plain");
context.startActivity(shareIntent);
break;
default:
ViewHolder holder = (ViewHolder) recyclerView.findViewHolderForAdapterPosition(selectedItem);
if (holder != null) {
holder.expandButton.setSelected(false);
holder.expandableLayout.collapse();
}
if (position == selectedItem) {
selectedItem = UNSELECTED;
} else {
expandButton.setSelected(true);
expandableLayout.expand();
selectedItem = position;
}
break;
}
}
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v=inflater.inflate(R.layout.recycler_item, parent,false);
return new ViewHolder(v);
}
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
holder.bind(position);
setAnimation(holder.itemView, position);
}
private int lastPosition = -1;
private void setAnimation(View viewToAnimate, int position) {
if (position > lastPosition) {
Animation anim = AnimationUtils.loadAnimation(context, android.R.anim.fade_in);
viewToAnimate.startAnimation(anim);
lastPosition = position;
}
}
#Override
public int getItemCount() {
return data.size();
}
}
OnCreate() of Activity.java
protected void onCreate(Bundle savedInstanceState) {
setTheme(R.style.AppTheme_NoActionBar);
super.onCreate(savedInstanceState);
setContentView(R.layout.main_layout);
layout = (CoordinatorLayout)findViewById(R.id.coordinator1);
FloatingActionButton myFab = (FloatingActionButton) findViewById(R.id.floatingActionButton);
mRecyclerView = (RecyclerViewEmptySupport) findViewById(R.id.my_recycler_view);
mRecyclerView.setEmptyView(findViewById(R.id.list_empty));
myFab.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
FragmentManager fm = getSupportFragmentManager();
AddSongDialogFragment addSongDialogFragment = new AddSongDialogFragment();
addSongDialogFragment.show(fm, "add_song");
}
});
mAdapter = new RecyclerAdapter(MainActivity.this, data, mRecyclerView);
mLayoutManager = new LinearLayoutManager(MainActivity.this);
mRecyclerView.setAdapter(mAdapter);
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setLayoutManager(mLayoutManager);
dbHelper = new DBHelper(this);
mAdapter.swap(dbHelper.readFromDB());
RecyclerView.ItemAnimator itemAnimator = new DefaultItemAnimator();
itemAnimator.setAddDuration(700);
itemAnimator.setRemoveDuration(1000);
mRecyclerView.setItemAnimator(itemAnimator);
}

Use getAdapterPosition() to get correct position of your item from your VIewHolder. That way the positions will not be mixed up after moving/deleting items from the RecyclerView.
NOTE: If the user clicks on the empty space during the animationgetAdapterPosition() might return -1: make sure to handle the case.
Good luck

You can use notifyItemRangeChanged(position, data.size()); to notify the other items after you added the new item.
You can also animate the swap() function if you use the functions notifyItemRemoved() notifyItemInserted() and notifyItemMoved() instead of notifyDataSetChanged(). You only have to check if the new list includes the items of the old list.

Get parent layout from custom Adapter

Could anybody explain me, how to realize?
I have an activity with listview and footer with some elements(textview).
Listview built with custom adapter. Each listview item has few elements. And my question: how can i change textview in footer, from custom adapter, when i clicking on some listview's element?
Thx a lot!
/**** My adapter ****/
public class MyListAdapter extends ArrayAdapter<Product> implements UndoAdapter {
private final Context mContext;
private HashMap<Product, Integer> mIdMap = new HashMap<Product, Integer>();
ArrayList<Product> products = new ArrayList<Product>();
final int INVALID_ID = -1;
LayoutInflater lInflater;
String imagePath;
public MyListAdapter(Context context, int textViewResourceId, List<Product> prod) {
//super(context, textViewResourceId, prod);
super(prod);
lInflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
mContext = context;
for (int i = 0; i < prod.size(); i++) {
//add(prod.get(i));
mIdMap.put(prod.get(i),i);
}
}
#Override
public long getItemId(final int position) {
//return getItem(position).hashCode();
Product item = (Product) getItem(position);
return mIdMap.get(item);
}
#Override
public boolean hasStableIds() {
return true;
}
#Override
public View getView(final int position, View convertView, final ViewGroup parent) {
ViewHolder holder = null;;
Product p = getItem(position);
if (convertView == null) {
convertView = lInflater.inflate(R.layout.item, null);
//convertView.setBackgroundResource(R.drawable.rounded_corners);
int currentTheme = Utils.getCurrentTheme(convertView.getContext());
switch (currentTheme) {
case 0:
convertView.setBackgroundResource(R.drawable.rounded_corners);
break;
case 1:
convertView.setBackgroundResource(R.drawable.border);
break;
default:
convertView.setBackgroundResource(R.drawable.rounded_corners);
break;
}
holder = new ViewHolder();
holder.tvDescr = (TextView) convertView.findViewById(R.id.tvDescr);
holder.list_image = (ImageView) convertView.findViewById(R.id.list_image);
holder.products_amount = (TextView) convertView.findViewById(R.id.amountDigits);
holder.products_price = (TextView) convertView.findViewById(R.id.priceDigits);
holder.ivImage = (ImageView) convertView.findViewById(R.id.ivImage);
holder.unit = (TextView) convertView.findViewById(R.id.unit);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
if(p.getProductImageBitmap() != null && p.getProductImageBitmap() != "") {
Log.d("PATH -- ", p.getProductImageBitmap());
ImageLoader imageLoader = ImageLoader.getInstance();
DisplayImageOptions options = new DisplayImageOptions.Builder().cacheInMemory(true)
.resetViewBeforeLoading(true)
.showImageForEmptyUri(R.drawable.ic_launcher)
.showImageOnFail(R.drawable.ic_launcher)
/*.showImageOnLoading(R.id.progress_circular)*/
.build();
imageLoader.displayImage(p.getProductImageBitmap(), holder.list_image, options);
} else {
holder.list_image.setImageResource(R.drawable.ic_launcher);
}
holder.tvDescr.setText(p.getProductName());
holder.ivImage.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
String deletedItem = getItem(position).getProductName();
MyListAdapter.this.remove(getItem(position));
if (MyListAdapter.this.getCount() > 0) {
Toast.makeText(mContext, deletedItem + " " + mContext.getString(R.string.deleted_item), Toast.LENGTH_SHORT).show();
MyListAdapter.this.notifyDataSetChanged();
} else {
Toast.makeText(mContext,mContext.getString(R.string.sklerolist_empty), Toast.LENGTH_SHORT).show();
}
}
});
//Функционал для большой картинки продукта
//открывается новое активити с большой картинкой
holder.list_image.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
imagePath = getItem(position).getProductImageBitmap();
if(imagePath != null && imagePath != "") {
Pattern normalPrice = Pattern.compile("^file");
Matcher m2 = normalPrice.matcher(imagePath);
if (m2.find()) {
Intent myIntent = new Intent(view.getContext(), ViewImage.class).putExtra("imagePath", imagePath);
view.getContext().startActivity(myIntent);
}
}
}
});
holder.products_price.setText(fmt(p.getProductPrice()));
holder.products_amount.setText(fmt(p.getProductAmount()));
holder.unit.setText(p.getProductUnit());
return convertView;
}
public static String fmt(double d){
if(d == (long) d)
return String.format("%d",(long)d);
else
return String.format("%s",d);
}
static class ViewHolder {
ImageView list_image;
TextView tvDescr;
TextView products_amount;
TextView products_price;
TextView unit;
ImageView ivImage;
ProgressBar circleProgress;
}
#NonNull
#Override
public View getUndoView(final int position, final View convertView, #NonNull final ViewGroup parent) {
View view = convertView;
if (view == null) {
//view = LayoutInflater.from(mContext).inflate(R.layout.undo_row, parent, false);
view = lInflater.inflate(R.layout.undo_row, parent, false);
}
return view;
}
#NonNull
#Override
public View getUndoClickView(#NonNull final View view) {
return view.findViewById(R.id.undo_row_undobutton);
}
public View getHeaderView(final int position, final View convertView, final ViewGroup parent) {
TextView view = (TextView) convertView;
//View view = convertView;
if (view == null) {
//view = (TextView) LayoutInflater.from(mContext).inflate(R.layout.list_header, parent, false);
//view = lInflater.inflate(R.layout.list_header, parent, false);
}
//view.setText(mContext.getString(R.string.header, getHeaderId(position)));
return view;
}
public long getHeaderId(final int position) {
return position / 10;
}
}

Your ListView has a listener for the click events on list elements.
#Override
public void onListItemClick(ListView l, View v, int position, long id) {
// Do something when a list item is clicked
}
But if you want to pas something else back from the adapter to the Activity or the Fragment that contains that ListView and Adapter, you should create a simple interface and set it as listener to your adapter. After that, set click events on your rows from within the adapter, and notify the Activity or Fragment using your own interface.
For example you have the interface defined like this
public interface OnItemClickedCustomAdapter {
public void onClick(ItemPosition position);
}
and in your Adapter class you will have a private member
private OnItemClickedCustomAdapter mListener;
and a method used to set the listener
public void setOnItemClickedCustomAdapter(OnItemClickedCustomAdapter listener){
this.mListener = listener;
}
From your Activity or Fragment where your ListView is defined, and your adapter is set, you will be able to call setOnItemClickedCustomAdapter with this as parameter, and there you go. Your activity will now listen for your events. To trigger an event, just call mListener.onClick() from your custom adapter. You can pass back data you need back to the Activity or Fragment, and from there you have access to your Header or Footer directly, and you can change the text on them.

Android JSON Data not parsing into ListView

Android not parsing JSON data into ListView, I am using this tutorial and just made few changes in ListViewAdapter.java
Like in my new implementation i used ViewHolder, and my code looks like this:
public class ListViewAdapter extends BaseAdapter {
// Declare Variables
Context context;
ArrayList<HashMap<String, String>> data;
ImageLoader imageLoader;
HashMap<String, String> resultp = new HashMap<String, String>();
ViewHolder holder;
public ListViewAdapter(Context context,
ArrayList<HashMap<String, String>> arraylist) {
this.context = context;
data = arraylist;
imageLoader = new ImageLoader(context);
}
#Override
public int getCount() {
return data.size();
}
#Override
public Object getItem(int position) {
return data.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
static class ViewHolder {
public ViewHolder(View convertView) {
// TODO Auto-generated constructor stub
}
TextView rank;
TextView country;
TextView population;
ImageView flag;
}
public View getView(final int position, View convertView, ViewGroup parent) {
// Declare Variables
// Avoid unneccessary calls to findViewById() on each row, which is expensive!
holder = null;
/*
* If convertView is not null, we can reuse it directly, no inflation required!
* We only inflate a new View when the convertView is null.
*/
if (convertView == null) {
convertView = ((Activity) context).getLayoutInflater().inflate(R.layout.listview_item, null);
// Create a ViewHolder and store references to the two children views
holder = new ViewHolder(convertView);
holder.rank = (TextView) convertView.findViewById(R.id.rank);
holder.country = (TextView) convertView.findViewById(R.id.country);
holder.population = (TextView) convertView.findViewById(R.id.population);
// Locate the ImageView in listview_item.xml
holder.flag = (ImageView) convertView.findViewById(R.id.flag);
// The tag can be any Object, this just happens to be the ViewHolder
convertView.setTag(holder);
} else {
// Get the ViewHolder back to get fast access to the TextView
// and the ImageView.
holder = (ViewHolder) convertView.getTag();
}
// Capture position and set results to the TextViews
holder.rank.setText(resultp.get(MainActivity.RANK));
holder.country.setText(resultp.get(MainActivity.COUNTRY));
holder.population.setText(resultp.get(MainActivity.POPULATION));
// Capture position and set results to the ImageView
// Passes flag images URL into ImageLoader.class
imageLoader.DisplayImage(resultp.get(MainActivity.FLAG), holder.flag);
// Capture ListView item click
return convertView;
}
}
Edited: Click on ListItem code
#Override
protected void onPostExecute(Void args) {
// Locate the listview in listview_main.xml
listview = (ListView) findViewById(R.id.listview);
// Pass the results into ListViewAdapter.java
adapter = new ListViewAdapter(MainActivity.this, arraylist);
// Set the adapter to the ListView
listview.setAdapter(adapter);
// Close the progressdialog
mProgressDialog.dismiss();
listview.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// code to handle click
}
});
}
But i don't no why i am not getting data into ListView !

The issue is that you are not assigning the HashMap to `resultp that has the information you want to display
public View getView(final int position, View convertView, ViewGroup parent) {
holder = null;
if (convertView == null) {
convertView = ((Activity) context).getLayoutInflater().inflate(R.layout.listview_item, null);
holder = new ViewHolder(convertView);
holder.rank = (TextView) convertView.findViewById(R.id.rank);
holder.country = (TextView) convertView.findViewById(R.id.country);
holder.population = (TextView) convertView.findViewById(R.id.population);
holder.flag = (ImageView) convertView.findViewById(R.id.flag);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
// Here's the change
resultp = data.get(position);
// Here's the change
holder.rank.setText(resultp.get(MainActivity.RANK));
holder.country.setText(resultp.get(MainActivity.COUNTRY));
holder.population.setText(resultp.get(MainActivity.POPULATION));
imageLoader.DisplayImage(resultp.get(MainActivity.FLAG), holder.flag);
return convertView;
}
To attach OnItemClickListener to your ListView, in the Activity that contains the ListView, add the following:
public class MyActivity implements OnItemClickListener{
ListView lv;
#Override
public void onCreate(Bundle savedInstanceState() {
....
....
// lv initialized here
// adapter of lv set here
attachListeners();
}
private void attachListeners() {
....
....
// attach listeners to other views if you like
lv.setOnItemClickListener(this);
}
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// code to handle click
}
}
Or, if you don't want your Activity to implement OnItemClickListener, then,
public class MyActivity {
ListView lv;
#Override
public void onCreate(Bundle savedInstanceState() {
....
....
// lv initialized here
// adapter of lv set here
attachListeners();
}
private void attachListeners() {
....
....
// attach listeners to other views if you like
lv.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// code to handle click
}
});
}
}

First of all try to fix this:
#Override
public Object getItem(int position) {
return data.get(position);
}
#Override
public long getItemId(int position) {
return position;
}

Get Selected value from Spinner inside ListView Android

I have a ListView of Spinners I'm trying to get the selected values out of. Some of the Spinners have the first selection automatically selected if there is only 1 item in the list, so I feel
setOnItemSelectedListener
won't necessarily work? Either way, I'm unsure how to code this scenario. Even if I had the listener coded correctly, How do I use it in my class to work with the adapter?
CustomAdapter
public class CustomPLNViewAdapter extends BaseAdapter{
private static ArrayList<ArrayList<String>> partLotNumbersArrayList;
private static ArrayList<String> partNames;
private LayoutInflater mInflater;
private Context myContext;
public CustomPLNViewAdapter(Context context, ArrayList<ArrayList<String>> results, ArrayList<String> parts){
partLotNumbersArrayList = results;
partNames = parts;
mInflater = LayoutInflater.from(context);
myContext = context;
}
#Override
public int getCount() {
return partLotNumbersArrayList.size();
}
#Override
public Object getItem(int position) {
return partLotNumbersArrayList.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = mInflater.inflate(R.layout.view_assembly_parts, null);
holder = new ViewHolder();
holder.txtName = (TextView) convertView.findViewById(R.id.partName);
holder.spinner = (Spinner) convertView.findViewById(R.id.LotNumbers);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.txtName.setText(partNames.get(position));
ArrayAdapter<String> adp1=new ArrayAdapter<String>(myContext, android.R.layout.simple_list_item_1, partLotNumbersArrayList.get(position));
adp1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
//set the adapter to the spinnner
holder.spinner.setAdapter(adp1);
//if there is only one other part besides "" then set that as default part
if(partLotNumbersArrayList.get(position).size() == 2){
holder.spinner.setSelection(1);
}
return convertView;
}
static class ViewHolder {
TextView txtName;
Spinner spinner;
}
}
Where I am calling the code. Obviously I get an error here because an ArrayList cannot be cast to Spinner, but I'm unsure how to get the View of the Adapter and then the subsequent spinner?
// save button click event
saveButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
Log.d("lv count", Integer.toString(lv.getCount()));
//iterate through listview,
for(int i = 0; i < lv.getCount(); i++){
Spinner temp = (Spinner) lv.getItemAtPosition(i);
Log.d("lv isItemCheck", temp.getSelectedItem().toString());
}
//check to make sure all items have been selected
if(!checkAllParts()){
Toast.makeText(getApplicationContext(), "Please Select All List Items", Toast.LENGTH_SHORT).show();
}
else{
Toast.makeText(getApplicationContext(), "All items have been selected", Toast.LENGTH_SHORT).show();
}
//go back to previous intent, return 100 that saving succeeded
//close intent
}
});

Adding a new row on button click to a list view

I want to add a new row on clicking add button in a list view in android.
Can someone help me out?
Here is the code I have so far:
public class prsnlhstry<EventArgs> extends Activity implements OnItemClickListener {
public static ArrayList<String> arr_sort_textview1= null;
public static ArrayList<String> arr_sort_textview2=null;
public static ArrayList<String> arr_sort_textview3=null;
public Resources ApptResources= null;
private ContextWrapper mycontext;
tododata todo;
int clickcounter = 0;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ListView lv= (ListView)findViewById(R.id.listview);
todo = new tododata(this);
List<listObject> List = new ArrayList<listObject>();
for(int i = 0; i <= 5; i++){
listObject lo = new listObject();
lo.grade = Integer.toString(i);
lo.reason = Integer.toString(i);
lo.school = Integer.toString(i);
List.add(lo);
}
CustomAdapter ca = new CustomAdapter(this);
lv = (ListView)findViewById(R.id.listview);
lv.setAdapter(ca);
lv.setOnItemClickListener(this);
ca.notifyDataSetChanged();
Button button = (Button) findViewById(R.id.btn);
button.setOnClickListener(new OnClickListener(){
public void onClick(View v) {
Toast.makeText(prsnlhstry.this, "Row Added Successfully", Toast.LENGTH_SHORT).show();
}
});
}
private class listObject {
String grade;
String school;
String reason;
}
public class CustomAdapter extends BaseAdapter {
private LayoutInflater mInflater;
public CustomAdapter(Context context) {
mInflater = LayoutInflater.from(context);
}
#Override
public int getCount() {
return todo.getLength();
}
#Override
public Object getItem(int position) {
return position;
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
String temp = null;
// to reinflate it. We only inflate a new View when the convertView supplied
// by ListView is null.
if (convertView == null) {
convertView = mInflater.inflate(R.layout.grid_item, null);
// Creates a ViewHolder and store references to the views
// we want to bind data to.
holder = new ViewHolder();
holder.textview1 = (TextView) convertView.findViewById(R.id.item2);
holder.textview2 = (TextView) convertView.findViewById(R.id.item3);
holder.textview3 = (TextView) convertView.findViewById(R.id.item4);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.textview1.setText(todo.getgrade(position));
holder.textview2.setText(todo.getschool(position));
holder.textview3.setText(todo.getreason(position));
return convertView;
}
}
static class ViewHolder {
TextView textview1;
TextView textview2;
TextView textview3;
}
#Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
// TODO Auto-generated method stub
}
}

Just add the item to your list and refresh the adapter, nothing special.

You need to increment your "tododata" data structure on button click and then call to notifyDataSetChanged() method:
Button button = (Button) findViewById(R.id.btn);
button.setOnClickListener(new OnClickListener(){
public void onClick(View v) {
todo.addNewRow();
ca.notifyDataSetChanged();
Toast.makeText(prsnlhstry.this, "Row Added Successfully", Toast.LENGTH_SHORT).show();
}
});
To compile the above code you will need to define "ca" variable as the final one, or make it class member.
I hope it helps.