查看颜色变化点击每8个位置的变化RecyclerView

Question

因此，当我点击recyclerview的0位置来更改视图的颜色时，它也会在第8、第16和第24位置更改颜色(我在recyclerview中总共有26个项目(，如果我点击位置1，它会在第1、第9、第17和第25位置更改颜色，依此类推。我该如何修复这个

我的recyclerview适配器是

public class AdapterOccupiedRoomCleaning extends RecyclerView.Adapter<AdapterOccupiedRoomCleaning.ViewHolder> {
private List<ItemsAdapter> mList;
private Context mContext;
public AdapterOccupiedRoomCleaning(List<ItemsAdapter> list, Context context){
super();
mList = list;
mContext = context;
}
@NonNull
@Override
public AdapterOccupiedRoomCleaning.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int i) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.occupiedrooms_cleaning_item, parent, false);
ViewHolder viewHolder = new ViewHolder(v);
return viewHolder;
}
@Override
public void onBindViewHolder(@NonNull AdapterOccupiedRoomCleaning.ViewHolder viewHolder, int position) {
ItemsAdapter itemAdapter = mList.get(position);
((ViewHolder) viewHolder).setUrduText.setText(itemAdapter.getUrdutext());
((ViewHolder) viewHolder).setEnglishText.setText(itemAdapter.getEnglishText());
((ViewHolder) viewHolder).setCleaningImage.setImageResource(itemAdapter.getImage());
//        ((ViewHolder) viewHolder).background.setOnClickListener(new View.OnClickListener() {
//            @Override
//            public void onClick(View v) {
//
//                //viewHolder.background.setBackgroundColor(Color.parseColor("#08A467"));
//                
//                Toast.makeText(mContext, "Recycle Click " + viewHolder.setEnglishText.getText().toString(), Toast.LENGTH_SHORT).show();
//            }
//        });
viewHolder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
viewHolder.background.setBackgroundColor(Color.parseColor("#08A467"));
}
});
}
@Override
public int getItemCount() {
//notifyDataSetChanged();
return mList.size();
}

class ViewHolder extends RecyclerView.ViewHolder{
public TextView setUrduText, setEnglishText;
public ImageView setCleaningImage;
public View background;
public ViewHolder(View itemView) {
super(itemView);
setUrduText = (TextView) itemView.findViewById(R.id.urduTextView);
setEnglishText = (TextView) itemView.findViewById(R.id.englishTextView);
setCleaningImage = (ImageView) itemView.findViewById(R.id.imageCleaning);
background = (View) itemView.findViewById(R.id.backgroundColor);
}
}
}

我的java类是

public class OccupiedRoomCleaning extends AppCompatActivity {
String getQrCode, patientMRNO, roomNumber;
private RecyclerView mRecycleview;
private List<ItemsAdapter> mList = new ArrayList<>();
private AdapterOccupiedRoomCleaning mAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_occupied_room_cleaning);

getQrCode = getIntent().getExtras().getString("qrcode");
init();
addList();
adapter();
}
private void init(){
mRecycleview = findViewById(R.id.recyclerview);
}
private void addList(){
ItemsAdapter itemAdapter = new ItemsAdapter();
itemAdapter.setImage(R.drawable.pillowclean);
itemAdapter.setUrdutext("sdf");
itemAdapter.setEnglishText("Pillow Parachute Cover Cleaning");
mList.add(itemAdapter);
itemAdapter = new ItemsAdapter();
itemAdapter.setImage(R.drawable.bedclean);
itemAdapter.setUrdutext("sdfs");
itemAdapter.setEnglishText("Patient Bed Cleaning(Blood Spots)");
mList.add(itemAdapter);
//... more items


}
private void adapter(){
Log.d("anhtt","mlist : " +mList.size());
mAdapter = new AdapterOccupiedRoomCleaning(mList, this);

mRecycleview.setAdapter(mAdapter);
mRecycleview.setLayoutManager(new LinearLayoutManager(this));
}
}

我做错了什么，每8件都会变色

Answer 1

这似乎是RecyclerView的视图回收行为的问题。

一般来说，每当您的ViewHolder的某些属性只在onBindViewHolder()中有条件地设置时，您都会遇到这样的问题。也就是说，因为您不总是更新ViewHolder的背景色，所以您将得到"；错误的"；回收和重复使用时的颜色。

您将不得不以某种方式存储"；点击"；或"；选择"；状态，然后每次在onBindViewHolder()中更新ViewHolder的背景色。类似这样的东西：

@Override
public void onBindViewHolder(@NonNull AdapterOccupiedRoomCleaning.ViewHolder viewHolder, int position) {
ItemsAdapter itemAdapter = mList.get(position);
...
if (itemAdapter.isSelected()) {
viewHolder.background.setBackgroundColor(Color.parseColor("#08A467"));
} else {
viewHolder.background.setBackgroundColor(Color.parseColor("#FFFFFF"));
}
viewHolder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
itemAdapter.setSelected(true);
viewHolder.background.setBackgroundColor(Color.parseColor("#08A467"));
}
});
}

请注意，最好在onCreateViewHolder()中定义点击侦听器，并使用notifyItemChanged()，而不是手动更新背景色，但这超出了本问题的范围。

Answer 2

由于Recycler视图重用视图而不创建新视图，因此需要在onBindViewHolder函数中设置默认颜色。

@Override
public void onBindViewHolder(@NonNull AdapterOccupiedRoomCleaning.ViewHolder viewHolder, int position) {
ItemsAdapter itemAdapter = mList.get(position);
((ViewHolder) viewHolder).setUrduText.setText(itemAdapter.getUrdutext());
((ViewHolder) viewHolder).setEnglishText.setText(itemAdapter.getEnglishText());
((ViewHolder) viewHolder).setCleaningImage.setImageResource(itemAdapter.getImage());
// Add this line
((ViewHolder) viewHolder).background.setBackgroundColor(Color.parseColor("default color"));
viewHolder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
viewHolder.background.setBackgroundColor(Color.parseColor("#08A467"));
}
});
}