[Android] ListView

1. Docs
   
   • ListView Background
     http://developer.android.com/resources/articles/listview-backgrounds.html
   • xxx
     
2. Adapter
3. Customize Listview
   
   • Define and load data
     private String m_rows[] = {"Jimmy", "Jacky", "Lucy", "HanMeimei", "LiLei"}
     
   • Define layout of row
     
                   android:layout_width="fill_parent"
                   android:layout_height="wrap_content"
                   android:orientation="horizontal" >
                       android:layout_width="wrap_content"
                   android:layout_height="wrap_content"/>
                       android:layout_width="wrap_content"
                   android:layout_height="wrap_content"
                   android:orientation="vertical" >
                               android:layout_width="wrap_content"
                       android:layout_height="wrap_content" />
                               android:layout_width="wrap_content"
                       android:layout_height="wrap_content"/>
        
     
     
   • Implement BaseAdapter
     public class MyAdapter extends BaseAdapter { 
         private class ItemViewHolder
         {
             ImageView m_icon;
             TextView m_name;
             TextView m_time;
         }
      
      
         public int getCount()
         {                         
             return m_rows.length;  //Return the count of rows
         } 
      
         public Object getItem(int position)
         {      
             return m_rows[position]; 
         } 
      
         public long getItemId(int position)
         {   
             return position; 
         } 
      
         public View getView(int position, View convertView, ViewGroup parent)
         {  
             ItemViewHolder holder;
     
             if (convertView == null)
             {
                 convertView = inflater.inflate(R.layout.xxx, null);
                 holder = new ItemViewHolder();
                 holder.m_icon = (ImageView)convertView.findViewById(R.id.icon);
                 holder.m_name = (TextView)convertView.findViewById(R.id.name);
                 holder.m_time = (TextView)convertView.findViewById(R.id.time);
      
                 convertView.setTag(holder);
             }
             else
             {
                 holder = convertView.getTag();
             }   
     
             holder.m_icon.setImageBitmap(xxx);
             holder.m_name.setText(m_rows[position]);
             holder.m_time.setText(xxx);
        
             return convertView;
         } 
      
     } 
     
   • Display data
     ListView listview = (ListView) findViewById(xxx);
     MyAdapter adapter = new MyAdapter();
     listview.setAdapter(adapter);
     
   • xxx
     
4. Get selected items
   int i, pos;
   SparseBooleanArray array;
   array = listView.getCheckedItemPositions();
   for (i = 0; i < array.size(); i++)
   {
       pos = array.keyAt(i);
       System.out.println("the item " + pos + " is selected");
   }
   
5. Long clickable event
   
   • Add android:longClickable="true" to ListView element of layout file
   • Regieter listener with the following function
     ListView.setOnItemLongClickListener(AdapterView.OnItemLongClickListener listener)
     
   • xxx
     
6. Long clickable Context Menu
   
   • Add android:longClickable="true" to ListView element of layout file
     
   • Invoke registerForContextMenu(getListView()) in Activity
   • Override the following functions of Activity
     public void onCreateContextMenu(ContextMenu menu, View view, ContextMenuInfo menuInfoIn);
     public boolean onContextItemSelected(MenuItem item)
   • Note:
     
     • if you called ListView.setOnItemLongClickListener(AdapterView.OnItemLongClickListener listener) for the list view, you must ensure the method onItemLongClick of interface AdapterView.OnItemLongClickListener to return false;
       ie:
       public MyItemLongClickedListener implements AdapterView.OnItemLongClickListener
       {
           public boolean onItemLongClick(AdapterView parent, View view, int position, long id)
           {
               ....
               return false;
           }
       }
     • xxx
       
   • xxx
     
7. Set choice mode
   listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
   listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
   
8. Seperator View
               style="?android:attr/listSeparatorTextViewStyle"
               android:text="@string/listSeparatorTextViewStyle"
               android:layout_marginTop="5dip"
           />
   
   
9. xxx