我在我的 recyclerview 中有兩個按鈕，用于增加（+）和減少（-）數量值，就像購物車應用程序一樣，同時增加第 0 個項目的項目值我的下一個項目，即第 1 個按第 0 個項目的 previuos 值增加意味著如果我的價值第 0 項是 4，對于第 1 項，如果我將它遞增 1，那么它將直接取 5，而不是從 0 開始。public class TeaListAdapter extends RecyclerView.Adapter<TeaListAdapter.MyViewHolder> { private int num=0; private List<TeaListPOJO> teaItemList; public class MyViewHolder extends RecyclerView.ViewHolder { public TextView tvitemName, tvitemRate,number; public ImageView ivItemImg; public Button btnIncrease,btnDecrease; RecyclerView.ViewHolder holder; public MyViewHolder(View view) { super(view); tvitemName = (TextView) view.findViewById(R.id.txt_item_name); tvitemRate = (TextView) view.findViewById(R.id.txt_item_price); ivItemImg= (ImageView) view.findViewById (R.id.iv_item); number=(TextView) view.findViewById (R.id.integer_number); btnIncrease =view.findViewById(R.id.btn_increase); btnDecrease = view.findViewById(R.id.btn_decrease); } } public TeaListAdapter(List<TeaListPOJO> teaItemList) { this.teaItemList = teaItemList; } @Override public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View itemView = LayoutInflater.from(parent.getContext()) .inflate(R.layout.rv_placeorder_items, parent, false); return new MyViewHolder (itemView); }
1 回答
UYOU
TA貢獻1878條經驗 獲得超4個贊
你的問題是只為所有視圖聲明一個變量，你應該從中獲取值然后TextView修改然后將它設置回TextView 試試這個代碼
holder.btnIncrease.setOnClickListener (new View.OnClickListener () {
@Override
public void onClick(View view) {
int val = 0;
try{
val = Integer.parseInt(holder.number.getText().toString());
}catch(Exception e) {
val = 0;
}
holder.number.setText (String.valueOf (val++));
}
});
holder.btnDecrease.setOnClickListener (new View.OnClickListener () {
@Override
public void onClick(View view) {
int val = 0;
try{
val = Integer.parseInt(holder.number.getText().toString());
}catch(Exception e) {
val = 0;
}
if(val>0) val--;
holder.number.setText (String.valueOf (val));
}
});
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