android - 按钮在 ListView 项目中单击，混淆项目上的操作

Question

我有一个带有按钮的 ListView 。当我单击按钮时，我希望为整个项目设置一个 alpha 值并使按钮的文本发生变化。基本功能(项目被设置为 alpha 值和按钮文本更改)有效，但多个列表项目因此获得相同的效果。我也试过在 stackoverflow 中阅读很多关于这个的帖子，但对我来说没有用。我真的试了很多，请帮忙。

我的适配器代码如下:

public class CustomAdapter extends BaseAdapter {
    private LayoutInflater mInflater;  
    Context context;
    ArrayList<CustomModel> rowItem;
    String status = "strike";

CustomAdapter(Context context, ArrayList<CustomModel> rowItem) {
    this.mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    this.context = context;
    this.rowItem = rowItem;
}

@Override
public int getCount() {

    return rowItem.size();
}

@Override
public Object getItem(int position) {

    return rowItem.get(position);
}

@Override
public long getItemId(int position) {

    return rowItem.indexOf(getItem(position));
}

@Override
public View getView(int position, View vi, ViewGroup parent) {
    //View vi = convertView; // trying to reuse a recycled view
    final ViewHolder holder;
    if (vi == null) {
        // The view is not a recycled one: we have to inflate

        vi = mInflater.inflate(R.layout.order_item, null);
        holder = new ViewHolder();
        holder.rm = rowItem.get(position);
        holder.rootLayout = (LinearLayout) vi.findViewById(R.id.root_Layout);
        holder.tv_name = (TextView) vi.findViewById(R.id.item_name);
        holder.tv_quantity = (TextView) vi.findViewById(R.id.item_qty);
        holder.tv_price = (TextView) vi.findViewById(R.id.item_price);
        holder.tv_rate = (TextView) vi.findViewById(R.id.item_rate);

        holder.layout1 = (LinearLayout) vi.findViewById(R.id.layout1);
        holder.layout2 = (LinearLayout) vi.findViewById(R.id.layout2);
        holder.layout3 = (LinearLayout) vi.findViewById(R.id.layout3);
        holder.layout4 = (LinearLayout) vi.findViewById(R.id.layout4);

        holder.tv_prefs = (TextView) vi.findViewById(R.id.pref_name);
        holder.baseLayout = (LinearLayout) vi
                .findViewById(R.id.base_layout);
        holder.strikeoff = (Button) vi.findViewById(R.id.item_strike);

        holder.status = "strike";


        vi.setTag(holder);
    } else {
        holder = (ViewHolder) vi.getTag();
    }

    //holder.strikeoff.setTag(holder);
    holder.strikeoff.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            //@SuppressWarnings("unused")
            //ViewHolder holder = (ViewHolder) v.getTag();
            if (holder.status.equals("strike")) {
                holder.tv_rate.setPaintFlags(holder.tv_rate.getPaintFlags()
                        | Paint.STRIKE_THRU_TEXT_FLAG);
                holder.tv_price.setPaintFlags(holder.tv_rate.getPaintFlags()
                        | Paint.STRIKE_THRU_TEXT_FLAG);

                holder.layout1.setAlpha(.25f);
                holder.layout2.setAlpha(.25f);
                holder.layout3.setAlpha(.25f);
                holder.layout4.setAlpha(.25f);
                holder.tv_name.setAlpha(.25f);

                holder.strikeoff.setText("Undo");
                holder.status = "undo";
            }
        }
    });
    if (rowItem != null || !rowItem.isEmpty() || rowItem.size() != 0) {

        holder.tv_name.setText(rowItem.get(position).getItemName());
        holder.tv_quantity.setText(rowItem.get(position).getItemQuantity());
        holder.tv_price.setText("Price: "
                + rowItem.get(position).getItemPrice());
        holder.tv_rate.setText("Rate :"
                + rowItem.get(position).getItemRate());
        if (!rowItem.get(position).getPrefName().equals("Nil")) {
            holder.tv_prefs.setText(rowItem.get(position).getPrefName());
        }


        // Alternate colour for rows in listview
        if (position % 2 == 0) {
            holder.baseLayout.setBackgroundColor(Color.WHITE);

        } else {
            holder.baseLayout.setBackgroundColor(Color
                    .parseColor("#ededed"));

        }

    }

    return vi;
}

class strikeButtonClickListener implements OnClickListener {
    int position;
    ViewHolder holder;

    public strikeButtonClickListener(int pos, ViewHolder holder) {
        this.position = pos;
        this.holder = holder;
    }

    public void onClick(View v) {

        if (holder.status.equals("strike")) {
            holder.tv_rate.setPaintFlags(holder.tv_rate.getPaintFlags()
                    | Paint.STRIKE_THRU_TEXT_FLAG);
            holder.tv_price.setPaintFlags(holder.tv_rate.getPaintFlags()
                    | Paint.STRIKE_THRU_TEXT_FLAG);

            holder.layout1.setAlpha(.25f);
            holder.layout2.setAlpha(.25f);
            holder.layout3.setAlpha(.25f);
            holder.layout4.setAlpha(.25f);
            holder.tv_name.setAlpha(.25f);

            holder.strikeoff.setText("Undo");
            holder.status = "undo";
        } else {
            holder.tv_rate.setPaintFlags(holder.tv_rate.getPaintFlags()
                    & (~Paint.STRIKE_THRU_TEXT_FLAG));
            holder.tv_price.setPaintFlags(holder.tv_rate.getPaintFlags()
                    & (~Paint.STRIKE_THRU_TEXT_FLAG));

            holder.layout1.setAlpha(1f);
            holder.layout2.setAlpha(1f);
            holder.layout3.setAlpha(1f);
            holder.layout4.setAlpha(1f);
            holder.tv_name.setAlpha(1f);

            holder.strikeoff.setText("Strike off");
            holder.status = "strike";
        }

    }
}

static class ViewHolder {
    CustomModel rm;
    Button strikeoff;
    View strikeview;
    TextView tv_name, tv_quantity, tv_price, tv_rate, tv_prefs, ratetxt,
            pricetxt;
    LinearLayout baseLayout, rootLayout, layout1, layout2, layout3,
            layout4;
    FrameLayout frameLayout;
    ViewGroup vg;
    String status = "strike";
}

Answer 1

尝试在 CustomModel 类上添加一个 String 状态标志，并为此标志设置默认值:

public class CustomModel {
    private String status = "strike";

    public String getStatus() {
        return status;
    }

    public void setStatus(String status) {
        this.status = status;
    }
}

现在尝试在点击发生时改变状态值，并通知 adapter:

holder.strikeoff.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View v) {
       if(rowItem.get(position).getStatus().equals("strike")){
         rowItem.get(position).setStatus("undo");
       }else{
         rowItem.get(position).setStatus("strike");
       }
       notifyDataSetChanged();
    }
}

根据 getView() 中的状态更改列表项 alpha 和文本值:

@Override
public View getView(int position, View vi, ViewGroup parent) {

       if(rowItem.get(position).getStatus().equals("strike")){
            holder.tv_rate.setPaintFlags(holder.tv_rate.getPaintFlags()
                    | Paint.STRIKE_THRU_TEXT_FLAG);
            holder.tv_price.setPaintFlags(holder.tv_rate.getPaintFlags()
                    | Paint.STRIKE_THRU_TEXT_FLAG);

            holder.layout1.setAlpha(.25f);
            holder.layout2.setAlpha(.25f);
            holder.layout3.setAlpha(.25f);
            holder.layout4.setAlpha(.25f);
            holder.tv_name.setAlpha(.25f);

            holder.strikeoff.setText("Undo");
        } else {
            holder.tv_rate.setPaintFlags(holder.tv_rate.getPaintFlags()
                    & (~Paint.STRIKE_THRU_TEXT_FLAG));
            holder.tv_price.setPaintFlags(holder.tv_rate.getPaintFlags()
                    & (~Paint.STRIKE_THRU_TEXT_FLAG));

            holder.layout1.setAlpha(1f);
            holder.layout2.setAlpha(1f);
            holder.layout3.setAlpha(1f);
            holder.layout4.setAlpha(1f);
            holder.tv_name.setAlpha(1f);

            holder.strikeoff.setText("Strike off");
        }


        return vi;
    }