У меня есть следующее приложение, над которым я работаю, и которое я пытаюсь сделать так, чтобы при каждом нажатии на изображение в RecyclerView его две соответствующие кнопки из строки xml становились видимыми (по умолчанию они невидимы).
Вот мой код ...
MainAcitivity.Java
package com.mdadi.animals2;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import java.util.ArrayList;
import static android.view.View.VISIBLE;
public class MainActivity extends AppCompatActivity implements MyAdapter.OnImageListener {
private RecyclerView list; //RecyclerView instance
private RecyclerView.Adapter mAdapter; //Adapter
private RecyclerView.LayoutManager mLayoutManager;
private ArrayList<ListData> data = new ArrayList<>();
ListData lastPosition;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Initialize data
data = ListData.initData();
final EditText editText = findViewById(R.id.editTxt);
list = findViewById(R.id.recyclerView); //Lookup RecyclerView in activity layout
list.setHasFixedSize(true);
mLayoutManager = new LinearLayoutManager(this);
list.setLayoutManager(mLayoutManager); //Set layout manager to position items/rows
//Attach adapter to RecyclerView to pop items
mAdapter = new MyAdapter(data, this);
list.setAdapter(mAdapter);
/* findViewById(R.id.delBtn).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String newFact = editText.getText().toString();
mAdapter.notifyItemInserted(listData.size() - 1);
}
});*/
}
@Override
public void onImageClick(int position) {
int lastPos = position;
Button delBtn = findViewById(R.id.delBtn);
Button nextBtn = findViewById(R.id.nextBtn);
data.remove(R.id.delBtn);
delBtn.setVisibility(VISIBLE);
mAdapter.notifyItemChanged(R.id.delBtn);
nextBtn.setVisibility(VISIBLE);
mAdapter.notifyItemChanged(R.id.nextBtn);
Log.d("MyActivity", position + " clicked");
}
}
MyAdapter.Java
package com.mdadi.animals2;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import java.util.ArrayList;
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {
//ViewHolder defined above
private ArrayList<ListData> data; //ArrayList member var for ListData
private OnImageListener mOnImageListener;
//Pass in data array for constructor
public MyAdapter(ArrayList<ListData> data, OnImageListener onImageListener) {
this.data = data;
this.mOnImageListener = onImageListener;
}
@NonNull
@Override
public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
//Inflate custom layout
View rootView = LayoutInflater.from(parent.getContext()).inflate
(R.layout.recycler_view_item, parent, false);
//Return new holder instance
return new MyViewHolder(rootView, mOnImageListener);
}
//Pop data into item through holder
@Override
public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
//Get data model based on position
ListData listData = data.get(position);
//String message = data.get(position).getDesc();
//holder.textView.setText(message);
//Set item views based on created views and data
holder.textView.setText(listData.getDesc());
holder.img.setImageResource(listData.getImgURL());
}
//Return total item count of list
@Override
public int getItemCount() {
if (data != null)
return data.size();
else
return 0;
}
public class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
private TextView textView;
private ImageView img;
private Button next;
private Button delete;
OnImageListener onImageListener;
public MyViewHolder(View v, OnImageListener onImageListener) {
super(v);
textView = v.findViewById(R.id.fact);
img = v.findViewById(R.id.image);
next = v.findViewById(R.id.nextBtn);
delete = v.findViewById(R.id.delBtn);
this.onImageListener = onImageListener;
v.setOnClickListener(this);
}
public void onClick(View view) {
onImageListener.onImageClick(getAdapterPosition());
}
}
public interface OnImageListener {
void onImageClick(int position);
}
}
ListData.Java
package com.mdadi.animals2;
import java.util.ArrayList;
public class ListData {
private String desc;
private int imgURL;
public ListData(String desc, int imgURL) {
this.desc = desc;
this.imgURL = imgURL;
}
public void setDesc(String desc) {
this.desc = desc;
}
public String getDesc() {
return desc;
}
public int getImgURL() {
return imgURL;
}
public static ArrayList<ListData> initData() {
ArrayList<ListData> list = new ArrayList<>();
list.add(new ListData("bird\n",R.drawable.bird)); //1
list.add(new ListData("cat\n",R.drawable.cat)); //2
list.add(new ListData("dog\n",R.drawable.dog)); //3
list.add(new ListData("fish\n",R.drawable.fish)); //4
list.add(new ListData("kangaroo\n",R.drawable.kangaroo)); //5
list.add(new ListData("monkey\n",R.drawable.monkey)); //6
list.add(new ListData("turtle\n",R.drawable.turtle)); //7
list.add(new ListData("horse\n",R.drawable.horse)); //8
list.add(new ListData("elephant\n",R.drawable.elephant)); //9
list.add(new ListData("turkey\n",R.drawable.turkey)); //10
return list;
}
}
Проблема здесь в том, что, хотя он возвращает правильную позицию изображения, по которому щелкнули, в logd, кнопки часто отображаются для неправильной строки.