Question

我想根据更改的值更改网格视图中按钮的颜色。我的代码在这里。但它没有用。所有按钮的颜色始终相同

 public View getView(final int position, View convertView, ViewGroup parent) {
            final ViewHolder holder;
            System.out.println("Inside GETVIEW()");

            if (convertView == null) {
                 System.out.println("Inside convertVIEW()");
                holder = new ViewHolder();
                convertView = mInflater.inflate(R.layout.list_toggle_button, null);
                holder.button = (Button) convertView.findViewById(R.id.each_device);
                convertView.setTag(holder);
                View_device.add(convertView);
               if (Constants.Score!=null) {
                Log.i("SCORE:ARAY LIST",""+Constants.Score);

                for(int m=0;m<Constants.Score.size();m++)
                {
                    if(Constants.Score.get(m)==0){
                        holder.button.setBackgroundResource(R.drawable.red_btn);//FAILED
                        Log.i("SCORE::ZERO","RED BACKGROUND");
                    }
                    else {
                        holder.button.setBackgroundResource(R.drawable.green_btn);//PASS
                        Log.i("SCORE::ONE","GREEN BACKGROUND");
                    }
                }
               }
              }}

Answer 1

删除 for 循环，如下所示，它将起作用。

    public View getView(final int position, View convertView, ViewGroup parent) {
    final ViewHolder holder;
    System.out.println("Inside GETVIEW()");

    if (convertView == null) {
         System.out.println("Inside convertVIEW()");
        holder = new ViewHolder();
        convertView = mInflater.inflate(R.layout.list_toggle_button, null);
        holder.button = (Button) convertView.findViewById(R.id.each_device);
        convertView.setTag(holder);
        View_device.add(convertView);
       if (Constants.Score!=null) {
        Log.i("SCORE:ARAY LIST",""+Constants.Score);


            if(Constants.Score.get(position)==0){
                holder.button.setBackgroundResource(R.drawable.green_btn);//FAILED
                Log.i("SCORE::ZERO","RED BACKGROUND");
            }
            else {
                holder.button.setBackgroundResource(R.drawable.red_btn);//PASS
                Log.i("SCORE::ONE","GREEN BACKGROUND");
            }

       }
      }}

Answer 2

试试这个，

public View getView(final int position, View convertView, ViewGroup parent) {
            final ViewHolder holder;
            System.out.println("Inside GETVIEW()");

            if (convertView == null) {
                 System.out.println("Inside convertVIEW()");
                holder = new ViewHolder();
                convertView = mInflater.inflate(R.layout.list_toggle_button, null);
                holder.button = (Button) convertView.findViewById(R.id.each_device);
                convertView.setTag(holder);
                View_device.add(convertView);
           }else{
               holder=(ViewHolder)convertView.getTag();
            }
               if (Constants.Score!=null) {
                Log.i("SCORE:ARAY LIST",""+Constants.Score);

                for(int m=0;m<Constants.Score.size();m++)
                {
                    if(Constants.Score.get(m)==0){
                        holder.button.setBackgroundResource(R.drawable.red_btn);//FAILED
                        Log.i("SCORE::ZERO","RED BACKGROUND");
                    }
                    else {
                        holder.button.setBackgroundResource(R.drawable.green_btn);//PASS
                        Log.i("SCORE::ONE","GREEN BACKGROUND");
                    }
                }
              }else{
                holder.button.setBackgroundResource(R.drawable.red_btn);//FAILED
                            Log.i("SCORE::ZERO","RED BACKGROUND");
    }
 }

按钮网格视图的背景颜色不会根据条件而变化

2 个答案: