Android用复选框onClick刷新TextView？

Posted 2023-04-19

【中文标题】Android用复选框onClick刷新TextView？

【英文标题】：Android refreshing TextView with checkbox onClick?

【发布时间】：2014-11-18 05:05:59

【问题描述】：

当用户选中 CheckBox 时，我正在尝试动态更新（更改颜色和删除线文本）ListView 中的 TextView。

我的代码有点工作，但由于某种原因，仅在第二次单击复选框时，即用户检查没有任何反应，用户取消检查并再次检查 TextView，然后根据需要更新？

任何帮助表示赞赏。

我的代码：

@Override
public View getView(final int position, final View convertView, final ViewGroup parent) 

    View view = convertView;
    if (view == null) 
        view = lInflater.inflate(R.layout.shoppinglist, parent, false);
    

    String anItem = get_Item(position);//from item array

    ((TextView) view.findViewById(R.id.tvSLItemName)).setText(anItem);

    final CheckBox checkBox = (CheckBox) view.findViewById(R.id.cbBoxSL);

    checkBox.setOnCheckedChangeListener(new OnCheckedChangeListener()

        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) 
            View aView = convertView;
            if (aView == null) 
                aView = lInflater.inflate(R.layout.shoppinglist, parent, false);
            
            if(isChecked)  

                checked[position] = true;
                ((TextView) aView.findViewById(R.id.tvSLItemName)).setTextColor(Color.GRAY);
                ((TextView) aView.findViewById(R.id.tvSLItemName)).setPaintFlags(
                        ((TextView) aView.findViewById(R.id.tvSLItemName)).getPaintFlags()
                        | Paint.STRIKE_THRU_TEXT_FLAG);
                //aView.invalidate();
                notifyDataSetChanged();

            
            else
                checked[position] = false;
            

        
    );

    checkBox.setChecked(checked[position]);
    return view;

更新的代码如下所示：

@Override
public View getView(final int position, final View convertView, final ViewGroup parent) 

    View view = convertView;
    if (view == null) 
        view = lInflater.inflate(R.layout.shoppinglist, parent, false);
    

    String anItem = get_Item(position);//from item array

    ((TextView) view.findViewById(R.id.tvSLItemName)).setText(anItem);

    final CheckBox checkBox = (CheckBox) view.findViewById(R.id.cbBoxSL);

    checkBox.setOnClickListener(new OnClickListener() 

        @Override
        public void onClick(View v) 
            View aView = convertView;
            if (aView == null) 
                aView = lInflater.inflate(R.layout.shoppinglist, parent, false);
            
            if(((CheckBox) v).isChecked()) 
                checked[position] = true;
                ((TextView) aView.findViewById(R.id.tvSLItemName)).setTextColor(Color.GRAY);
                ((TextView) aView.findViewById(R.id.tvSLItemName)).setPaintFlags(
                        ((TextView) aView.findViewById(R.id.tvSLItemName)).getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG);
                //aView.invalidate();
                notifyDataSetChanged();
            else
                checked[position] = false;
            

        
    );

    checkBox.setChecked(checked[position]);
    return view;

问题陈述没有变化。

【参考方案1】：

好吧，我解决了，不太清楚发生了什么，也许有人可以详细解释一下？无论如何，问题在于我在 getView() 中反复声明 TextView，只需将其声明为变量（在本例中为 tv），然后在该方法中调用 tv 即可。感谢您的帮助。

        @Override
    public View getView(final int position, final View convertView, final ViewGroup parent) 

        View view = convertView;

        if (view == null) 
            view = lInflater.inflate(R.layout.shoppinglist, parent, false);
        
        final TextView tv = (TextView)view.findViewById(R.id.tvSLItemName);
        String anItem = get_Item(position);//from item array
        tv.setText(anItem);
        final CheckBox checkBox = (CheckBox) view.findViewById(R.id.cbBoxSL);        
        checkBox.setOnCheckedChangeListener(new OnCheckedChangeListener()

            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) 
                View aView = convertView;
                if (aView == null) 
                    aView = lInflater.inflate(R.layout.shoppinglist, parent, false);
                
                if(isChecked)                          
                    checked[position] = true;                       
                    tv.setTextColor(Color.GRAY);                    
                    tv.setPaintFlags(
                            ((TextView) aView.findViewById(R.id.tvSLItemName)).getPaintFlags()
                            | Paint.STRIKE_THRU_TEXT_FLAG);
                    notifyDataSetChanged();     
                
                else
                    checked[position] = false;
                                   
            
        );         
        checkBox.setChecked(checked[position]);
        return view;