自定义的ListView与日期为SectionHeader（使用的自定义SimpleCursorAdapter） [英] Custom ListView with Date as SectionHeader (Used custom SimpleCursorAdapter)

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问题描述

我想与日期为SectionHeader显示的ListView。

I want to display ListView with Date as SectionHeader.

我有：   我从SQLite数据库使用自定义SimpleCursorAdapter显示的ListView。

What i have : I am displaying ListView from sqlite database using custom SimpleCursorAdapter.

我的自定义SimpleCursorAdapter是：

My Custom SimpleCursorAdapter is :

public class DomainAdapter extends SimpleCursorAdapter{
private Cursor dataCursor;

private LayoutInflater mInflater;

public DomainAdapter(Context context, int layout, Cursor dataCursor, String[] from,
        int[] to) {
    super(context, layout, dataCursor, from, to);
        this.dataCursor = dataCursor;
        mInflater = LayoutInflater.from(context);
}


public View getView(int position, View convertView, ViewGroup parent) {

    ViewHolder holder;

    if (convertView == null) {
        convertView = mInflater.inflate(R.layout.todo_row, null);

        holder = new ViewHolder();
        holder.text1 = (TextView) convertView.findViewById(R.id.label);//Task Title
        holder.text2 = (TextView) convertView.findViewById(R.id.label2);//Task Date
        holder.img =   (ImageView) convertView.findViewById(R.id.task_icon);

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

    dataCursor.moveToPosition(position);
    int title = dataCursor.getColumnIndex("title"); 
    String task_title = dataCursor.getString(title);

    int title_date = dataCursor.getColumnIndex("day"); 
    String task_day = dataCursor.getString(title_date);

    int description_index = dataCursor.getColumnIndex("priority"); 
    int priority = dataCursor.getInt(description_index);

    holder.text1.setText(task_title);
    holder.text2.setText(task_day);

    if(priority==1) holder.img.setImageResource(R.drawable.redbutton);
    else if(priority==2) holder.img.setImageResource(R.drawable.bluebutton);
    else if(priority==3)holder.img.setImageResource(R.drawable.greenbutton);
    else holder.img.setImageResource(R.drawable.redbuttonchecked);

    return convertView;
}

static class ViewHolder {
    TextView text1;
    TextView text2;
    ImageView img;
}
}

谷歌到目前为止结果：

MergeAdapter

杰夫·夏基

惊人的ListView

SO问题

问题：我要显示的ListView与日期为节头。 Ofcourse日期值来自SQLite数据库。

Problem : I want to display listview with Date as section headers. Ofcourse Date values come from sqlite database.

任何人都可以请指导我怎样才能实现这个任务。

Can anyone please guide me how can i achieve this task.

或提供我一个样品code或涉及到完全相同的（像）code。

Or Provide me a Sample Code or Exact(like) Code related to the same.

编辑据格雷厄姆Borald的回答（这工作得很好。但是这是一个速战速决。）

Edited According to Graham Borald's Answer (This works fine. However it was a quick fix.)

public class DomainAdapter extends SimpleCursorAdapter{
    private Cursor dataCursor;
    private LayoutInflater mInflater;

    public DomainAdapter(Context context, int layout, Cursor dataCursor, String[] from,
            int[] to) {
        super(context, layout, dataCursor, from, to);
            this.dataCursor = dataCursor;
            mInflater = LayoutInflater.from(context);
    }

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

        ViewHolder holder;

        if (convertView == null) 
        {
            convertView = mInflater.inflate(R.layout.tasks_row, null);
            holder = new ViewHolder();
            holder.text1 = (TextView) convertView.findViewById(R.id.label);//Task Title
            holder.text2 = (TextView) convertView.findViewById(R.id.label2);//Task Date
            holder.img =   (ImageView) convertView.findViewById(R.id.taskImage);

            holder.sec_hr=(TextView) convertView.findViewById(R.id.sec_header);

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

        dataCursor.moveToPosition(position);
        int title = dataCursor.getColumnIndex("title"); 
        String task_title = dataCursor.getString(title);

        int title_date = dataCursor.getColumnIndex("due_date"); 
        String task_day = dataCursor.getString(title_date);

        int description_index = dataCursor.getColumnIndex("priority"); 
        int priority = dataCursor.getInt(description_index);

        String prevDate = null;

        if (dataCursor.getPosition() > 0 && dataCursor.moveToPrevious()) {
            prevDate = dataCursor.getString(title_date);
            dataCursor.moveToNext();
        }


        if(task_day.equals(prevDate))
        {
            holder.sec_hr.setVisibility(View.GONE);
        }
        else
        {
            holder.sec_hr.setText(task_day);
            holder.sec_hr.setVisibility(View.VISIBLE);
        }

        holder.text1.setText(task_title);
        holder.text2.setText(task_day);

        if(priority==1) holder.img.setImageResource(R.drawable.redbutton);
        else if(priority==2) holder.img.setImageResource(R.drawable.bluebutton);
        else if(priority==3)holder.img.setImageResource(R.drawable.greenbutton);
        else holder.img.setImageResource(R.drawable.redbuttonchecked);

        return convertView;
    }

    static class ViewHolder {
        TextView text1;
        TextView text2;
        TextView sec_hr;
        ImageView img;
    }
}

编辑据CommonsWare的答案

Edited According to CommonsWare's Answer

public class DomainAdapter extends SimpleCursorAdapter{
        private Cursor dataCursor;
        private TodoDbAdapter adapter;

        private LayoutInflater mInflater;
        boolean header;
      String last_day;
      public DomainAdapter(Context context, int layout, Cursor dataCursor, String[] from,
        int[] to) {
        super(context, layout, dataCursor, from, to);
        this.dataCursor = dataCursor;
        mInflater = LayoutInflater.from(context);
        header=true;
        adapter=new TodoDbAdapter(context);
}


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

    ViewHolder holder = null;
    TitleHolder title_holder = null;

    if(getItemViewType(position)==1)
    {
        //convertView= mInflater.inflate(R.layout.todo_row, parent, false);

        if (convertView == null) 
        {
            convertView = mInflater.inflate(R.layout.todo_row, null);

            holder = new ViewHolder();
            holder.text1 = (TextView) convertView.findViewById(R.id.label);//Task Title
            holder.text2 = (TextView) convertView.findViewById(R.id.label2);//Task Date
            holder.img =   (ImageView) convertView.findViewById(R.id.task_icon);

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

        dataCursor.moveToPosition(position);
        int title = dataCursor.getColumnIndex("title"); 
        String task_title = dataCursor.getString(title);

        int title_date = dataCursor.getColumnIndex("day"); 
        String task_day = dataCursor.getString(title_date);

        int description_index = dataCursor.getColumnIndex("priority"); 
        int priority = dataCursor.getInt(description_index);

        holder.text1.setText(task_title);
        holder.text2.setText(task_day);

        if(priority==1) holder.img.setImageResource(R.drawable.redbutton);
        else if(priority==2) holder.img.setImageResource(R.drawable.bluebutton);
        else if(priority==3)holder.img.setImageResource(R.drawable.greenbutton);
        else holder.img.setImageResource(R.drawable.redbuttonchecked);
    }
    else
    {

        if (convertView == null) 
        {
            convertView = mInflater.inflate(R.layout.section_header, null);

            title_holder = new TitleHolder();
            title_holder.datee = (TextView) convertView.findViewById(R.id.sec_header);//Task Title

            convertView.setTag(title_holder);
        }
        else 
        {
            title_holder = (TitleHolder) convertView.getTag();
        }

        dataCursor.moveToPosition(position);

        int title_date = dataCursor.getColumnIndex("day"); 
        String task_day = dataCursor.getString(title_date);

        title_holder.datee.setText(task_day);
    }

    return convertView;
}

static class ViewHolder {
    TextView text1;
    TextView text2;
    ImageView img;
}

 static class TitleHolder{
    TextView datee;
}


@Override
public int getCount() {
    return dataCursor.getCount()+1; //just for testing i took no. of headers=1
}


@Override
public int getViewTypeCount() {
    return 2;
}

@Override
public int getItemViewType(int position) {

    dataCursor.moveToPosition(position);
    **Long id=dataCursor.getLong(position);**
    Cursor date=adapter.fetchTodo(id);
    int title_date = date.getColumnIndex("day"); 
        String task_day = date.getString(title_date);
        Log.i("tag",task_day);

    if(last_day.equals(task_day))
        return 1;//Display Actual Row
    else
    {
        last_day=task_day;//Displaying Header
        return 0;
    }

}

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

    final View view;

    if(getItemViewType(cursor.getPosition())==1)
        view= mInflater.inflate(R.layout.todo_row, parent, false);
    else
        view=mInflater.inflate(R.layout.section_header,parent, false);

    return view;

}

@Override
public void bindView(View convertView, Context context, Cursor cursor) {
    long id = cursor.getPosition();

}*/
}

我收到的空指针异常的在行：光标日期= adapter.fetchTodo（ID）; 看来，光标没有得到任何数据。

I am getting Null Pointer Exception at line : Cursor date=adapter.fetchTodo(id); Seems that Cursor is not getting any data.

推荐答案

到目前为止，要做到这一点最简单的方法是嵌入每个项目的在日头视图的。然后，所有你需要做的， bindView 是比较previous行的日期到该行的日期，显示日期，如果是相同的。事情是这样的：

By far the simplest way to do this is to embed the date header view in every item. Then, all you need to do in bindView is compare the previous row's date to this row's date, and hide the date if it's the same. Something like this:

    String thisDate = cursor.getString(dateIndex);
    String prevDate = null;

    // get previous item's date, for comparison
    if (cursor.getPosition() > 0 && cursor.moveToPrevious()) {
        prevDate = cursor.getString(dateIndex);
        cursor.moveToNext();
    }

    // enable section heading if it's the first one, or 
    // different from the previous one
    if (prevDate == null || !prevDate.equals(thisDate)) {
        dateSectionHeaderView.setVisibility(View.VISIBLE);
    } else {
        dateSectionHeaderView.setVisibility(View.GONE);
    }

这篇关于自定义的ListView与日期为SectionHeader（使用的自定义SimpleCursorAdapter）的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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