我正在尝试使recyclerView
项目在滑动时变色,因此它会被加亮,因为在滑动时我打开了一个,AlertDialog
这样人就会知道他正在改变哪个项目。
但是我的主要问题是当我尝试通过使用更改背景颜色时
viewHolder.itemView.setBackgroundColor(Color.parseColor("#cc0000"));
没什么大不了的,这是我的完整代码 recyclerView
public void buildTopRecyclerView(){
mRecyclerViewTOP = findViewById(R.id.listView);
mRecyclerViewTOP.setHasFixedSize(true);
RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(this);
exampleAdapter = new ExampleAdapter(itemCassas);
mRecyclerViewTOP.setLayoutManager(mLayoutManager);
mRecyclerViewTOP.setAdapter(exampleAdapter);
// onSwipe();
new ItemTouchHelper(new ItemTouchHelper.SimpleCallback(0,ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT) {
@Override
public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
return false;
}
@Override
public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
int position = viewHolder.getAdapterPosition();
if (direction == ItemTouchHelper.RIGHT) {
customAllertDelete(position);
viewHolder.itemView.setBackgroundColor(Color.parseColor("#cc0000"));
exampleAdapter.notifyDataSetChanged();
}
if (direction == ItemTouchHelper.LEFT) {
customAllertQuantity(position);
}
}
}).attachToRecyclerView(mRecyclerViewTOP);
}
如果可能有用的话,这里也是适配器代码
public class ExampleAdapter extends RecyclerView.Adapter<ExampleAdapter.ExampleViewHolder> {
private ArrayList<ItemCassa> mExampleList;
@NonNull
@Override
public ExampleViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.recyclerlist_item,parent,false);
return new ExampleViewHolder(v);
}
ExampleAdapter(ArrayList<ItemCassa> exampleList){
mExampleList = exampleList;
}
@Override
public void onBindViewHolder(@NonNull ExampleViewHolder holder, int position) {
ItemCassa item = mExampleList.get(position);
holder.desc.setText(item.getBtnName());
holder.qta.setText(String.valueOf(item.getQuant()));
holder.imp.setText(String.valueOf((new DecimalFormat("#0.00").format(item.getPrice()))));
if(position % 2 == 0 ){
holder.itemView.setBackgroundColor(Color.parseColor("#C0C0C0"));
holder.desc.setBackgroundColor(Color.parseColor("#C0C0C0"));
holder.qta.setBackgroundColor(Color.parseColor("#C0C0C0"));
holder.imp.setBackgroundColor(Color.parseColor("#C0C0C0"));
}else if(position % 2 == 1){
holder.itemView.setBackgroundColor(Color.parseColor("#D3D3D3"));
holder.desc.setBackgroundColor(Color.parseColor("#D3D3D3"));
holder.qta.setBackgroundColor(Color.parseColor("#D3D3D3"));
holder.imp.setBackgroundColor(Color.parseColor("#D3D3D3"));
}
}
@Override
public int getItemCount() {
return mExampleList.size();
}
public static class ExampleViewHolder extends RecyclerView.ViewHolder {
public TextView desc;
public TextView qta;
public TextView imp;
ExampleViewHolder(View itemView) {
super(itemView);
desc = itemView.findViewById(R.id.Desc);
qta = itemView.findViewById(R.id.Qta);
imp = itemView.findViewById(R.id.Imp);
}
}
public void removeItem(int position) {
mExampleList.remove(position);
notifyItemRemoved(position);
}
}
这是gif,它“解释”了我想做的事情,正如您在滑动上看到的那样,它打开一个AlertDialog并返回选定的项目,但是现在我将为选定的项目着色背景,直到用户做出选择为止在AlertDialog中
尝试像这样使用:
首先,在onSwiped方法中调用适配器的方法并传递必需的参数。
@Override
public void onSwiped(RecyclerView.ViewHolder viewHolder, int swipeDir) {
int swipedPosition = viewHolder.getAdapterPosition();
YourAdapter adapter = (YourAdapter) rlCartList.getAdapter();
adapter.remove(swipedPosition); // I was removing items so you
can change the name of method as you like
}
现在在您的适配器中执行以下操作:
public void remove(int position) {
YourModel item = cartItems.get(position);
if (cartItems.contains(item)) {
ViewHolder.tvItemName.setBackgroundColor(mContext.getResources().getColor(R.color.grey));
notifyDataSetChanged();
}
}
还有一件事是,您将需要制作textView或您要为其分配背景的视图Static
。而且我已经测试了这段代码,在我的项目中,当TextView的背景在滑动时发生了变化时,它运行良好。
告诉我您是否需要进一步的帮助。此外,您还可以在适配器中使用警报对话框:)
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