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POCustom ListView with Date as SectionHeader (Used custom SimpleCursorAdapter)
 

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  1. POCustom ListView with Date as SectionHeader (Used custom SimpleCursorAdapter)
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    <p>I want to display ListView with Date as SectionHeader. </p> <p><strong>What i have :</strong> I am displaying ListView from sqlite database using custom SimpleCursorAdapter.</p> <p>My Custom SimpleCursorAdapter is :</p> <pre class="lang-java prettyprint-override"><code>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; } } </code></pre> <p><strong>Google Results so far :</strong></p> <p><a href="https://github.com/commonsguy/cwac-merge" rel="nofollow noreferrer">MergeAdapter</a></p> <p><a href="http://jsharkey.org/blog/2008/08/18/separating-lists-with-headers-in-android-09/" rel="nofollow noreferrer">Jeff Sharkey</a></p> <p><a href="http://code.google.com/p/android-amazing-listview/" rel="nofollow noreferrer">Amazing ListView</a></p> <p><a href="https://stackoverflow.com/questions/3841078/section-header-in-listview-not-show-correctly">SO Question</a></p> <p><strong>Problem :</strong> I want to display listview with Date as section headers. Ofcourse Date values come from sqlite database.</p> <p>Can anyone please guide me how can i achieve this task.</p> <p>Or Provide me a Sample Code or Exact(like) Code related to the same.</p> <p><strong>Edited</strong> According to Graham Borald's Answer (This works fine. However it was a quick fix.)</p> <pre class="lang-java prettyprint-override"><code>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() &gt; 0 &amp;&amp; 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; } } </code></pre> <p><strong>Edited</strong> According to CommonsWare's Answer</p> <pre class="lang-java prettyprint-override"><code>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(); }*/ } </code></pre> <p>I am getting <em>Null Pointer Exception</em> at line : <code>Cursor date=adapter.fetchTodo(id);</code> Seems that Cursor is not getting any data.</p>
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