将标头添加到ListView行或将标头附加到项目组

Question

我经历了很多关于如何分离项目并将它们分组在一个标题下的文章。总之，我喜欢根据是否显示标题使标题可见和不可见的想法。我也知道这种魔法发生在自定义适配器类的bindView / newView方法中。到现在为止还挺好。现在我正在查询数据库中的日期，我希望属于唯一日期的项目在日期标题下组合在一起。 （那就是我想按日期对项目进行分组）有没有办法可以在if else条件下检查日期（从光标中取出日期）并根据这些条件将它们组合在一起。我发现的一篇关于这个主题的文章是This。但是我无法完全理解它。对我来说，做同样的算法也行。

到目前为止，这是我的代码：

private class CurAdapter extends CursorAdapter{
        //  Context context; 
        //  Cursor c; 
        public CurAdapter(Context context, Cursor c, int flags) {
            super(context, c, flags);

            //      this.context = context; 
            //      this.c= c; 

        }


        @Override
        public void bindView(View view, Context context, Cursor c) {
            TextView tV = (TextView)view.findViewById(R.id.textView1); 
            TextView tV1 = (TextView)view.findViewById(R.id.textView2); 
            TextView tV2 = (TextView)view.findViewById(R.id.textView3);
            ImageView iM = (ImageView)view.findViewById(R.id.imageView2); 

            tV1.setTypeface(tf); 
            tV2.setTypeface(tf); 

            tV.setText(dateConvert(c.getString(c.getColumnIndexOrThrow("DateToNotify"))));
            String B = c.getString(c.getColumnIndexOrThrow("NotificationFor")); 
            tV1.setText(c.getString(c.getColumnIndexOrThrow("NotificationDateFor")));



            if(B.equalsIgnoreCase("1")){
                tV2.setText("Is "+c.getString(c.getColumnIndexOrThrow("NotificationData"))+" XXX");
                iM.setBackgroundResource(R.drawable.icon_XXX); 


            }else if(B.equalsIgnoreCase("2")){
                tV2.setText("Is "+c.getString(c.getColumnIndexOrThrow("NotificationData"))+" XXX");
                iM.setBackgroundResource(R.drawable.icon_XXX); 


            }else if(B.equalsIgnoreCase("3")){
                tV2.setText("Is "+c.getString(c.getColumnIndexOrThrow("NotificationData"))+" XXX");
                iM.setBackgroundResource(R.drawable.icon_XXX); 


            }else if(B.equalsIgnoreCase("4")){
                tV2.setText("Is "+c.getString(c.getColumnIndexOrThrow("NotificationData"))+" XXX");
                iM.setBackgroundResource(R.drawable.icon_XXX); 


            }else if(B.equalsIgnoreCase("5")){
                tV2.setText("Is "+c.getString(c.getColumnIndexOrThrow("NotificationData"))+" XXX");
                iM.setBackgroundResource(R.drawable.icon_XXX); 


            }else if(B.equalsIgnoreCase("6")){
                tV2.setText("Is "+c.getString(c.getColumnIndexOrThrow("NotificationData"))+" XXX");
                iM.setBackgroundResource(R.drawable.icon_XXX); 


            }else if(B.equalsIgnoreCase("7")){
                tV2.setText("Is "+c.getString(c.getColumnIndexOrThrow("NotificationData"))+" XXX");
                iM.setBackgroundResource(R.drawable.icon_XXX); 

            }


        }

        @Override
        public View newView(Context context, Cursor c, ViewGroup parent) {


            LayoutInflater inflater = LayoutInflater.from(context);
            View v = inflater.inflate(R.layout.detail_list, parent, false);
            bindView(v, context, c);
            return v;
        }

    }

基本上我想要一种方法来检查DateToNotify对每一行的含义，具体取决于我将隐藏视图。任何提示？

修改

到目前为止，这是我尝试过的，虽然我得到了理想的结果，但滚动列表会弄乱一切：

@Override
        public void bindView(View view, Context context, Cursor c) {

            TextView tV = (TextView)view.findViewById(R.id.textView1); 
            TextView tV1 = (TextView)view.findViewById(R.id.textView2); 
            TextView tV2 = (TextView)view.findViewById(R.id.textView3);
            ImageView iM = (ImageView)view.findViewById(R.id.imageView2); 

            tV1.setTypeface(tf); 
            tV2.setTypeface(tf); 


            if(tV.getText().toString().equals(dateConvert(c.getString(c.getColumnIndexOrThrow("DateToNotify"))))){


                tV.setVisibility(View.INVISIBLE); 
            }else{
                tV.setVisibility(View.VISIBLE); 

                tV.setText(dateConvert(c.getString(c.getColumnIndexOrThrow("DateToNotify"))));
            }

修改

根据This Question on StackOverflow优化代码

@Override
        public View newView(Context context, Cursor c, ViewGroup parent) {


            View view = LayoutInflater.from(context).inflate(R.layout.detail_list, null);
            //bindView(v, context, c);
            TextView tV = (TextView)view.findViewById(R.id.textView1); 
            TextView tV1 = (TextView)view.findViewById(R.id.textView2); 
            TextView tV2 = (TextView)view.findViewById(R.id.textView3);
            ImageView iM = (ImageView)view.findViewById(R.id.imageView2); 
            RelativeLayout RL = (RelativeLayout)view.findViewById(R.id.relative1); 

            view.setTag(R.id.textView1, tV); 
            view.setTag(R.id.textView2, tV1); 
            view.setTag(R.id.textView3, tV2); 
            view.setTag(R.id.imageView2, iM); 
            view.setTag(R.id.relative1, RL); 
            return view;
        }

和BindView：

@Override
        public void bindView(View view, Context context, Cursor c) {

            ((TextView) view.getTag(R.id.textView2)).setTypeface(tf); 
            ((TextView) view.getTag(R.id.textView3)).setTypeface(tf); 
        //  RelativeLayout RL =(RelativeLayout)view.findViewById(R.id.relative1); 
            String Bb = ((TextView) view.getTag(R.id.textView1)).getText().toString(); 
            if(Bb.equals(dateConvert(c.getString(c.getColumnIndexOrThrow("DateToNotify"))))){

                Toast.makeText(getActivity(), "If Condition: "+Bb, 10000).show(); 
                ((RelativeLayout)view.getTag(R.id.relative1)).setVisibility(View.INVISIBLE); 

            }else{

                ((RelativeLayout)view.getTag(R.id.relative1)).setVisibility(View.VISIBLE); 

                ((TextView) view.getTag(R.id.textView1)).setText(dateConvert(c.getString(c.getColumnIndexOrThrow("DateToNotify"))));
            }

Answer 1

以下是针对您的问题定制的解决方案:(基于您提供的链接）

private class CurAdapter extends CursorAdapter{


        private static final int VIEW_TYPE_GROUP_START = 0;
        private static final int VIEW_TYPE_GROUP_CONT = 1;
        private static final int VIEW_TYPE_COUNT = 2;

        LayoutInflater mInflater ;
        public CurAdapter(Context context, Cursor c, int flags) {
            super(context, c, flags);
            mInflater = LayoutInflater.from(context);


        }


        @Override
        public int getViewTypeCount() {
            return VIEW_TYPE_COUNT;
        }

        @Override
        public int getItemViewType(int position) {
            if (position == 0) {
                return VIEW_TYPE_GROUP_START;
            }
            Cursor cursor = getCursor();
            cursor.moveToPosition(position);
            boolean newGroup = isNewGroup(cursor, position);

            if (newGroup) {
                return VIEW_TYPE_GROUP_START;
            } else {
                return VIEW_TYPE_GROUP_CONT;
            }
        }

        @Override
        public void bindView(View view, Context context, Cursor c) {

            TextView tV = (TextView)view.findViewById(R.id.textView1); 
            TextView tV1 = (TextView)view.findViewById(R.id.textView2); 
            TextView tV2 = (TextView)view.findViewById(R.id.textView3);
            ImageView iM = (ImageView)view.findViewById(R.id.imageView2); 
            tV1.setTypeface(tf); 
            tV2.setTypeface(tf); 
            if(tV!=null)
                tV.setText(dateConvert(c.getString(c.getColumnIndexOrThrow("DateToNotify"))));


            String B = c.getString(c.getColumnIndexOrThrow("NotificationFor")); 
            tV1.setText(c.getString(c.getColumnIndexOrThrow("NotificationDateFor")));


            if(B.equalsIgnoreCase("1")){
                tV2.setText("Is "+c.getString(c.getColumnIndexOrThrow("NotificationData"))+" XXX");
                iM.setBackgroundResource(R.drawable.XXX); 

            }else if(B.equalsIgnoreCase("2")){
                tV2.setText("Is "+c.getString(c.getColumnIndexOrThrow("NotificationData"))+" XXX");
                iM.setBackgroundResource(R.drawable.icon_XXX); 

            }else if(B.equalsIgnoreCase("3")){

                tV2.setText("Is "+c.getString(c.getColumnIndexOrThrow("NotificationData"))+" XXX");

                iM.setBackgroundResource(R.drawable.icon_XXX); 

            }else if(B.equalsIgnoreCase("4")){

                tV2.setText("Is "+c.getString(c.getColumnIndexOrThrow("NotificationData"))+" XXX");
                iM.setBackgroundResource(R.drawable.icon_XXX); 

            }else if(B.equalsIgnoreCase("5")){

                tV2.setText("Is "+c.getString(c.getColumnIndexOrThrow("NotificationData"))+" XXX");
                iM.setBackgroundResource(R.drawable.icon_XXX); 

            }else if(B.equalsIgnoreCase("6")){
                tV2.setText("Is "+c.getString(c.getColumnIndexOrThrow("NotificationData"))+" XXX"); 
                iM.setBackgroundResource(R.drawable.icon_XXX); 

            }else if(B.equalsIgnoreCase("7")){

                tV2.setText("Is "+c.getString(c.getColumnIndexOrThrow("NotificationData"))+" XXX");
                iM.setBackgroundResource(R.drawable.icon_XXX); 
            }
        }

        @Override
        public View newView(Context context, Cursor cursor, ViewGroup parent) {

            int position = cursor.getPosition();
            int nViewType;

            if (position == 0) {
                nViewType = VIEW_TYPE_GROUP_START;
            } else {
                boolean newGroup = isNewGroup(cursor, position);
                if (newGroup) {
                    nViewType = VIEW_TYPE_GROUP_START;
                } else {
                    nViewType = VIEW_TYPE_GROUP_CONT;
                }
            }

            View v;

            if (nViewType == VIEW_TYPE_GROUP_START) {
                v = mInflater.inflate(R.layout.detail_list, parent, false);

                View vHeader = v.findViewById(R.id.relativeSecondary);
                vHeader.setOnClickListener(new OnClickListener() {
                    @Override
                    public void onClick(View v) {


                    }
                });
            } else {

                v = mInflater.inflate(R.layout.detail_list_no_header, parent, false);
            }
            return v;
        }


        private boolean isNewGroup(Cursor cursor, int position) {
            String ThisDate = dateConvert(cursor.getString(cursor.getColumnIndexOrThrow("DateToNotify"))); 
            cursor.moveToPosition(position - 1);
            String compareDate = dateConvert(cursor.getString(cursor.getColumnIndexOrThrow("DateToNotify"))); 
            cursor.moveToPosition(position);    
            if (!ThisDate.equalsIgnoreCase(compareDate)) {
                return true;
            }

            return false;
        }
    }