I'm using RecyclerView
with CardView
and inside the CardView
have 2 buttons. Now, have implemented the onClick
events by implementing View.OnClickListener
by the ViewHolder
static class and overriding the event (its working )like
@Override
public void onClick(View v) {
if (v.getId() == mClassBtn.getId()){
}
else if (v.getId() == mDaysBtn.getId()){
}
}
Looking for a solution/pattern to handle the Click
in the Activity
class like
adapter = new ItemsListAdapter(getActivity(), data, new CustomItemClickListener() {
@override
public void onItemClick(View v, int position) {
Log.d(TAG, "clicked position:" + position);
// which button clicked and separate action for each button
}
});
// CustomItemClickListener -- interface in the adapter class which holds the click event .
The above code working fine and able to log the Clicks
but not able to differentiate which button has clicked.
Appreciate any help
Update the ViewHolder to take in onClick() as a parameter. In the initializer, call setOnClickListener{} on the itemView . That's it! Your RecyclerView is now responsive so time to get your click on!
This method internally calls onBindViewHolder to update the ViewHolder contents with the item at the given position and also sets up some private fields to be used by RecyclerView. This method calls onCreateViewHolder to create a new ViewHolder and initializes some private fields to be used by RecyclerView.
By default it have 5. you can increase as per your need. Save this answer.
What does notifyDataSetChanged() do on recyclerview ? Notify any registered observers that the data set has changed. There are two different classes of data change events, item changes and structural changes. Item changes are when a single item has its data updated but no positional changes have occurred.
here is the best way to achieve that:--
this is how i have implemented
public class FollowersDetailsAdapter extends RecyclerView.Adapter<FollowersDetailsAdapter.MyViewHolder> {
private List<GetUserFollowDetailsResponseData> followersList;
Context context;
public FollowersDetailsAdapterListener onClickListener;
public class MyViewHolder extends RecyclerView.ViewHolder {
public TextView rv_tv_follower_name, rv_tv_follower_desig;
public CircleImageView rv_iv_follower_image;
RelativeLayout rv_rel_layout_followers, rel_layout_followers;
LikeButton rv_iv_follower_icon;
public MyViewHolder(View view) {
super(view);
rv_rel_layout_followers = (RelativeLayout) view.findViewById(R.id.rv_rel_layout_followers);
rel_layout_followers = (RelativeLayout) view.findViewById(R.id.rel_layout_followers);
rv_iv_follower_image = (CircleImageView) view.findViewById(R.id.rv_iv_follower_image);
rv_tv_follower_name = (TextView) view.findViewById(R.id.rv_tv_follower_name);
rv_tv_follower_desig = (TextView) view.findViewById(R.id.rv_tv_follower_desig);
rv_iv_follower_icon = (LikeButton) view.findViewById(R.id.rv_iv_follower_icon);
rel_layout_followers.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
onClickListener.iconTextViewOnClick(v, getAdapterPosition());
}
});
}
}
public FollowersDetailsAdapter(List<GetUserFollowDetailsResponseData> FollowersList, FollowersDetailsAdapterListener listener) {
this.followersList = FollowersList;
this.onClickListener = listener;
}
@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.followers_list_row, parent, false);
return new MyViewHolder(itemView);
}
@Override
public void onBindViewHolder(final MyViewHolder holder, final int position) {
if (followersList.get(position).getImage() != null && !followersList.get(position).getImage().trim().equalsIgnoreCase("")) {
Picasso.with(context)
.load(followersList.get(position).getImage())
.resize(200, 200).into(holder.rv_iv_follower_image);
}
holder.rv_tv_follower_name.setText(followersList.get(position).getName());
holder.rv_tv_follower_desig.setText(followersList.get(position).getDescription());
if (followersList.get(holder.getAdapterPosition()).getID() == Integer.parseInt(ApplicationPreference.getUserId())) {
holder.rv_iv_follower_icon.setVisibility(View.GONE);
} else {
holder.rv_iv_follower_icon.setVisibility(View.VISIBLE);
if (followersList.get(position).getIsFollowing() == 0) {
holder.rv_iv_follower_icon.setLiked(false);
} else if (followersList.get(position).getIsFollowing() == 1) {
holder.rv_iv_follower_icon.setLiked(true);
}
}
holder.rv_iv_follower_icon.setOnLikeListener(new OnLikeListener() {
@Override
public void liked(LikeButton likeButton) {
onClickListener.iconImageViewOnClick(likeButton, position);
}
@Override
public void unLiked(LikeButton likeButton) {
onClickListener.iconImageUnFollowOnClick(likeButton, position);
}
});
}
public interface FollowersDetailsAdapterListener {
void iconTextViewOnClick(View v, int position);
void iconImageViewOnClick(View v, int position);
void iconImageUnFollowOnClick(View v, int position);
}
@Override
public int getItemCount() {
return followersList.size();
}
}
and in your activity where you initialize the adapter--
followersDetailsAdapter = new FollowersDetailsAdapter(followersList, new FollowersDetailsAdapter.FollowersDetailsAdapterListener() {
@Override
public void iconTextViewOnClick(View v, int position) {
gotoUserProfile(followersList.get(position).getID());
}
@Override
public void iconImageViewOnClick(View v, int position) {
followUserProfile(followersList.get(position).getID(),1);
}
@Override
public void iconImageUnFollowOnClick(View v, int position){
followUserProfile(followersList.get(position).getID(),0);
}
});
Please, try this principle to create a communication between activity, adapter through the interface, I hope this principle helps you:
Model Class:
public class YourModel {
private String firstName;
private String lastName;
public YourModel(String firstName, String lastName) {
this.firstName = firstName;
this.lastName = lastName;
}
//... setters & getters
}
Interface:
public interface AdapterCallback {
void onClickCallback(YourModel itemModel);
}
Adapter:
public class YourAdapter extends RecyclerView.Adapter<YourAdapter.ViewHolder> {
private List<YourModel> data;
private AdapterCallback callback;
private Context context;
public YourAdapter(List<YourModel> data, AdapterCallback callback) {
this.data = data;
this.callback = callback
}
@Override
public YourAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
context = parent.getContext();
LayoutInflater inflater = LayoutInflater.from(context);
View item = inflater.inflate(R.layout.item_recycler, parent, false);
return new ViewHolder(item);
}
@Override
public void onBindViewHolder(YourAdapter.ViewHolder holder, int position) {
YourModel itemModel = data.get(position);
String lastName = itemModel.getLastName();
String firstName = itemModel.getFirstName();
holder.tvFirstName.setText(firstName);
holder.tvLastName.setText(lastName);
holder.tvFirstName.setOnClickListener {
callback.onClickCallback(itemModel));
}
}
@Override
public int getItemCount() {
return data.size();
}
static class ViewHolder extends RecyclerView.ViewHolder {
private TextView tvFirstName;
private TextView tvLastName;
ViewHolder(View itemView) {
super(itemView);
tvFirstName = (TextView) itemView.findViewById(R.id.tv_first);
tvLastName = (TextView) itemView.findViewById(R.id.tv_last);
}
}
Activity:
public class MyActivity extends AppCompatActivity implements AdapterCallback {
private YourAdapter adapter;
private List<YourModel> items;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// 1. init your list && fill it with needed data
// 2. init your adapter
// 3. put your list as parameter into constructor + interface
items = new ArrayList<YourModel>()
items.add(YourModel("John", "Doe"));
items.add(YourModel("Bob", "Marley"));
adapter = new YourAdapter(items, this)
}
@Override
public void onClickCallback(YourModel itemModel) {
Toast.makeText(this, itemModel.getFirstName(), Toast.LENGTH_SHORT).show();
}
I think that this information is enough to understand what I mean. The same principle you can create multiple OnClick methods in your interface or put one onClick for a few buttons and check id or something else to get needed information that you need. Good luck
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