问题
i am using RecyclerVeiw to display some images and on click its should start New Activity showing id, name of the RecyclerView. I implemented the code but its now working, its not clickable. below is my adapter
import android.content.Context;
import android.content.Intent;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import com.squareup.picasso.Picasso;
import java.util.ArrayList;
import zesteve.com.myapplication.Catagory;
import zesteve.com.myapplication.CatagoryVendListActivity;
import zesteve.com.myapplication.R;
/**
* Created by Ravi Shankar on 5/13/2017.
*/
public class CatagoryAdapter extends RecyclerView.Adapter<CatagoryAdapter.MyViewHolder>{
private Context mContext;
private ArrayList<Catagory> CatagoryList;
public CatagoryAdapter(Context mContext, ArrayList<Catagory> CatagoryList) {
this.mContext = mContext;
this.CatagoryList = CatagoryList;
}
@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.catagory_card, parent, false);
return new MyViewHolder(itemView,mContext,CatagoryList);
}
@Override
public void onBindViewHolder(final MyViewHolder holder, int position) {
Catagory catagory = CatagoryList.get(position);
holder.title.setText(catagory.getName());
holder.count.setText(catagory.getNumOfVend() + " Places");
// loading album cover using Picasso library
Picasso.with(mContext).load(catagory.getThumbnail()).into(holder.thumbnail);
}
@Override
public int getItemCount() {
return CatagoryList.size();
}
public class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
public TextView title, count;
public ImageView thumbnail;
ArrayList<Catagory> CatagoryList = new ArrayList<Catagory>();
Context mContext;
public MyViewHolder(View view , Context mContext, ArrayList<Catagory> CatagoryList ) {
super(view);
this.CatagoryList = CatagoryList;
this.mContext = mContext;
view.setOnClickListener(this);
title = (TextView) view.findViewById(R.id.title);
count = (TextView) view.findViewById(R.id.count);
thumbnail = (ImageView) view.findViewById(R.id.thumbnail);
}
@Override
public void onClick(View view) {
int position = getAdapterPosition();
Catagory catagory = this.CatagoryList.get(position);
Intent intent = new Intent(this.mContext, CatagoryVendListActivity.class);
intent.putExtra("CatId",catagory.getVendId());
intent.putExtra("CatName",catagory.getName());
this.mContext.startActivity(intent);
}
}
}
and my Catatgory.java
public class Catagory {
private String name;
private int numOfVend;
private int thumbnail;
private int VendId;
public Catagory() {
}
public Catagory(String name, int numOfVend, int VendId , int thumbnail) {
this.name = name;
this.VendId = VendId;
this.numOfVend = numOfVend;
this.thumbnail = thumbnail;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getNumOfVend() {
return numOfVend;
}
public void setNumOfVend(int numOfVend) {
this.numOfVend = numOfVend;
}
public int getThumbnail() {
return thumbnail;
}
public void setThumbnail(int thumbnail) {
this.thumbnail = thumbnail;
}
public int getVendId() {
return VendId;
}
public void setVendId(int VendId) {
this.VendId = VendId;
}
}
and my fragment
import android.content.Intent;
import android.content.res.Resources;
import android.graphics.Rect;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.v4.app.Fragment;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.TypedValue;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import java.util.ArrayList;
import zesteve.com.myapplication.adapter.CatagoryAdapter;
/**
* Created by Ratan on 7/29/2015.
*/
public class PrimaryFragment extends Fragment {
FloatingActionButton fab;
private RecyclerView recyclerView;
private CatagoryAdapter adapter;
private ArrayList<Catagory> catagoryList;
@Override
public View onCreateView(final LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View root = inflater.inflate(R.layout.primary_layout,container,false);
recyclerView = (RecyclerView) root.findViewById(R.id.recycler_view);
fab = (FloatingActionButton) root.findViewById(R.id.post_new_event);
catagoryList = new ArrayList<>();
adapter = new CatagoryAdapter(getActivity(), catagoryList);
RecyclerView.LayoutManager mLayoutManager = new GridLayoutManager(getActivity(), 2);
recyclerView.setLayoutManager(mLayoutManager);
recyclerView.addItemDecoration(new GridSpacingItemDecoration(2, dpToPx(10), true));
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.setAdapter(adapter);
prepareCatagory();
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(getActivity(),PostNewEvent.class);
startActivity(intent);
}
});
return root;
}
private void prepareCatagory() {
int[] covers = new int[]{
R.drawable.album1,
R.drawable.album2,
R.drawable.album3,
R.drawable.album4,
R.drawable.album5,
R.drawable.album6,
R.drawable.album7,
R.drawable.album8,
R.drawable.album9,
R.drawable.album10,
R.drawable.album11
};
Catagory a = new Catagory("True Romance", 13, 1, covers[0]);
catagoryList.add(a);
a = new Catagory("Xscpae", 8, 2 ,covers[1]);
catagoryList.add(a);
a = new Catagory("Maroon 5",3 ,11, covers[2]);
catagoryList.add(a);
a = new Catagory("Born to Die",4, 12, covers[3]);
catagoryList.add(a);
a = new Catagory("Honeymoon",5, 14, covers[4]);
catagoryList.add(a);
a = new Catagory("I Need a Doctor",6, 1, covers[5]);
catagoryList.add(a);
a = new Catagory("Loud", 11,7, covers[6]);
catagoryList.add(a);
a = new Catagory("Legend", 14,8, covers[7]);
catagoryList.add(a);
a = new Catagory("Hello", 11,9, covers[8]);
catagoryList.add(a);
a = new Catagory("Greatest Hits",10, 17, covers[9]);
catagoryList.add(a);
adapter.notifyDataSetChanged();
}
/**
* RecyclerView item decoration - give equal margin around grid item
*/
public class GridSpacingItemDecoration extends RecyclerView.ItemDecoration {
private int spanCount;
private int spacing;
private boolean includeEdge;
public GridSpacingItemDecoration(int spanCount, int spacing, boolean includeEdge) {
this.spanCount = spanCount;
this.spacing = spacing;
this.includeEdge = includeEdge;
}
@Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
int position = parent.getChildAdapterPosition(view); // item position
int column = position % spanCount; // item column
if (includeEdge) {
outRect.left = spacing - column * spacing / spanCount; // spacing - column * ((1f / spanCount) * spacing)
outRect.right = (column + 1) * spacing / spanCount; // (column + 1) * ((1f / spanCount) * spacing)
if (position < spanCount) { // top edge
outRect.top = spacing;
}
outRect.bottom = spacing; // item bottom
} else {
outRect.left = column * spacing / spanCount; // column * ((1f / spanCount) * spacing)
outRect.right = spacing - (column + 1) * spacing / spanCount; // spacing - (column + 1) * ((1f / spanCount) * spacing)
if (position >= spanCount) {
outRect.top = spacing; // item top
}
}
}
}
/**
* Converting dp to pixel
*/
private int dpToPx(int dp) {
Resources r = getResources();
return Math.round(TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp, r.getDisplayMetrics()));
}
}
when i click on cardview nothing is happening, no error message also. Below is my app screen shot
please comment for any doubts.
回答1:
Step-1: Make an interface like below code :
public interface RecyclerViewItemClickListener {
void onClickListenerForItem(int position);
}
Step-2: Implements this interface :
RecyclerViewItemClickListener recyclerItemClickListener = new RecyclerViewItemClickListener() {
@Override
public void onClickListenerForItem(int tournamentIndex, int matchIndex) {
//Todo implement your Code here
}
}
Step-3: send implemented interface in adapter class like below code:
mAdapter = new RecyclerViewAdapte(getContext(), recyclerItemClickListener);
Step-4: Implement callback for position in Adapter class:
private final RecyclerViewItemClickListener mListener;
public RecyclerViewAdapter(Context context, RecyclerViewItemClickListener mListener) {
this.context = context;
this.mListener = mListener;
}
Step-5: finaly set position in OnBindViewHolder():
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mListener.onClickListenerForItem(position);
}
});
来源：https://stackoverflow.com/questions/43962027/on-click-recyclerview-go-to-another-activity-with-data-in-android