问题
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. Thanks in advance.
回答1:
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);
}
});
回答2:
Please, try this principle to create a communication between activity, adapter through the interface, I hope this principle helps you:
Interface:
public interface AdapterCallback {
void onClickCallback(YourModel itemModel);
}
Adapter:
public class YourAdapter extends RecyclerView.Adapter<YourAdapter.ViewHolder> {
private List<String> mList;
private AdapterCallback callback;
private Context context;
public YourAdapter(List<String> list, AdapterCallback adapterCallback) {
this.mList = list;
adapter = adapterCallback
}
@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 = list.get(position);
String lastName = itemModel.getLastName(); // for example;
String firstName = itemModel.getFirstName(); // for example;
holder.tvFirstName.setText(firstName);
holder.tvLastName.setText(lastName);
holder.tvFirstName.setOnClickListener(
// you can override this onClick into your Activity.
adapterCallback.onClickCallback(itemModel));
}
}
@Override
public int getItemCount() {
return mList.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<String> 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<String>() // empty
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 few buttons and check id or something else to get needed information what you need. Good luck
回答3:
Try this
In your activity do like this
CustomItemClickListener listner;
listner=YourActivityName.this // in OnCreate Method
and pass this listner in your adapter
adapter = new ItemsListAdapter(getActivity(), data, listner);
And in your Adapter use it like this
CustomItemClickListener listner;
this.listner=listner; // In your Adapter COnstructor
and last in your onBindViewHolder do like this
holder.button1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
listner.onItemClick(holder.getLayoutPosition()); //getting position
}
});
holder.button2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
listner.onItemClick(holder.getLayoutPosition()); //getting position
}
});
回答4:
Here my solution if it could help someone.
You could click in one item of the recyclerview or one of the two buttons.
The interface implements:
onStudentItemClick, for click in the recyclerview item
onChatItemClick and onAbsenceItemClick for click the buttons
With
holder.imgChat.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
mOnClickListener.onChatItemClick(mStudents.get(index));
}
});
I set the click listener for one button
And in the class StudentViewHolder I implement OnClickListener and override onClik
@Override
public void onClick(View v) {
if (mOnClickListener != null){
int clickedPosition = getAdapterPosition();
mOnClickListener.onStudentItemClick(mStudents.get(clickedPosition));
}
}
Here the Adapter:
public class StudentsAdapter extends RecyclerView.Adapter<StudentsAdapter.StudentsViewHolder> {
private ListItemClickListener mOnClickListener;
private ArrayList<Student> mStudents;
public interface ListItemClickListener {
void onStudentItemClick(Student student);
void onChatItemClick(Student student);
void onAbsenceItemClick(Student student);
}
public StudentsAdapter(ArrayList<Student> students, ListItemClickListener listener) {
mStudents = students;
mOnClickListener = listener;
}
@Override
public StudentsViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
Context context = viewGroup.getContext();
int layoutIdForListItem = R.layout.student_list_item;
LayoutInflater inflater = LayoutInflater.from(context);
boolean shouldAttachToParentImmediately = false;
View view = inflater.inflate(layoutIdForListItem, viewGroup, shouldAttachToParentImmediately);
StudentsViewHolder viewHolder = new StudentsViewHolder(view);
return viewHolder;
}
@Override
public void onBindViewHolder(StudentsViewHolder holder, int position) {
final Integer index = position;
holder.tvStudent.setText(mStudents.get(position).nameForList());
holder.imgChat.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
mOnClickListener.onChatItemClick(mStudents.get(index));
}
});
holder.imgAbsence.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
mOnClickListener.onAbsenceItemClick(mStudents.get(index));
}
});
}
public Student getItem(Integer position){
return mStudents.get(position);
}
@Override
public int getItemCount() {
return mStudents.size();
}
class StudentsViewHolder extends RecyclerView.ViewHolder
implements OnClickListener {
ImageView imgStudent;
TextView tvStudent;
ImageButton imgChat, imgAbsence;
public StudentsViewHolder(View itemView) {
super(itemView);
imgStudent = (ImageView) itemView.findViewById(R.id.img_student);
tvStudent = (TextView) itemView.findViewById(R.id.tv_student);
imgChat = (ImageButton) itemView.findViewById(R.id.btn_chat_student);
imgAbsence = (ImageButton) itemView.findViewById(R.id.btn_absence);
itemView.setOnClickListener(this);
}
@Override
public void onClick(View v) {
if (mOnClickListener != null){
int clickedPosition = getAdapterPosition();
mOnClickListener.onStudentItemClick(mStudents.get(clickedPosition));
}
}
}
}
Fragment the implement the interface:
public class SubjectDetailFragment extends Fragment implements StudentsAdapter.ListItemClickListener {
...
@Override
public void onStudentItemClick(Student student) {
StudentDetailFragment detailFragment = StudentDetailFragment.newInstance();
Bundle bundle = new Bundle();
bundle.putParcelable("student", student);
detailFragment.setArguments(bundle);
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.frame_layout, detailFragment);
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
}
@Override
public void onChatItemClick(Student student) {
...
}
@Override
public void onAbsenceItemClick(Student student) {
...
}
回答5:
I do it this way.
Set an OnClickListener on your Button in the ViewHolder
Create a method in your activity with the button position as a parameter
Pass the position of the clicked entry and do stuff
ViewHolder
yourButton.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
int position = getAdapterPosition(); //Clicked entry in your List
//Method from your activity
yourActivity.methodOnBtnClick(position);
}
Activity
public void methodOnBtnClick(int position)
{
yourList.remove(position);
recycler.getAdapter().notifyDataSetChanged();
}
来源：https://stackoverflow.com/questions/44238018/recyclerview-onclick-for-multiple-buttons-and-handling-from-activity