public class MainActivity extends the Activity 
{

Private ListView mListView; 
Private TextView tv1. 
Public void onCreate (Bundle savedInstanceState) 
{
Super. OnCreate (savedInstanceState); 
The setContentView (R.l ayout. Activity_main); 
MListView=(ListView) the findViewById (R.i d.l istInfo); 
Tv1=(TextView) the findViewById (R.i d.l ist_title); 

//initialization data 
List List=new ArrayList (a); 
for (int i=0; I & lt; 10; I++) {
The Content of m. 
If (I & lt; 3) 
M=new Content (" A ", "b"); 
Else if (I & lt; 6) 
M=new Content (" F ", "party"); 
The else 
M=new Content (" D ", "east"); 
List. Add (m); 
} 

//instantiate custom content adaptation class 
MyAdapter adapter=new MyAdapter (this, list, tv1); 
//for listView 
MListView. SetAdapter (adapter); 
MListView. SetOnItemClickListener (new AdapterView. OnItemClickListener () {
@ Override 
Public void onItemClick (AdapterView<?> The parent, View View, int position, long id) {
} 
}); 

} 

} 

 public class MyAdapter extends BaseAdapter {

Private List List=null; 
Private Context mContext; 
TextView TV; 

Public MyAdapter (Context mContext List The list, the TextView TextView) {
Enclosing mContext=mContext; 
Enclosing a list=list; 
TV=textview; 
} 

Public void onItemClick (AdapterView<?> The parent, View View, int position, long id) {
Toast. MakeText (mContext, (String) the getItem (position), Toast. LENGTH_SHORT), show (); 
TV. SetText ((String) the getItem (position)); 
} 


Public int getCount () {
Return this. The list. The size (); 
} 

Public Object the getItem (int position) {
return null; 
} 

Public long getItemId (int position) {
Return the position; 
} 

Public View getView (final int position, View View and ViewGroup arg2) {
Final String item=(String) the getItem (position); 
ViewHolder ViewHolder=null; 
If (view==null) {
ViewHolder=new viewHolder (); 
View=LayoutInflater. The from (mContext). Inflate (R.l ayout. Item, null); 
ViewHolder. TvTitle=(TextView) view. The findViewById (R.i which itle); 
ViewHolder. TvLetter=(TextView) view. The findViewById (R.i, dc atalog); 
The setTag (viewHolder); 
} else {
ViewHolder=(viewHolder) the getTag (); 
} 

The final Content mContent=list. Get (position); 

If (position==0) {
ViewHolder. TvLetter. SetVisibility (the VISIBLE). 
ViewHolder. TvLetter. SetText (mContent getLetter ()); 
} else {
String lastCatalog=list. Get (position 1) getLetter (); 
If (mContent. GetLetter (.) the equals (lastCatalog)) {
ViewHolder. TvLetter. SetVisibility (View. GONE); 
} else {
ViewHolder. TvLetter. SetVisibility (the VISIBLE). 
ViewHolder. TvLetter. SetText (mContent getLetter ()); 
} 
} 

ViewHolder. TvTitle. SetText (enclosing a list. The get (position). The getName ()); 

Return the view; 

} 




Final static class ViewHolder {
TextView tvTitle; 
TextView tvLetter; 
} 


Public Object [] getSections () {
//TODO Auto - generated method stub 
return null; 
} 

Public int getSectionForPosition (int position) {

return 0; 
} 

Public int getPositionForSection (int section) {
The Content mContent; 
String l; 
If (section=='! ') {
return 0; 
} else {
for (int i=0; I & lt; GetCount (); I++) {
MContent=(Content) list. Get (I); 
L=mContent. GetLetter (); 
Char firstChar=l.t oUpperCase (). The charAt (0); 
If (firstChar==section) {
Return the I + 1; 
} 

} 
} 
MContent=null; 
L=null; 
return -1; 
} 
} 

CodePudding user response:

 

MListView. SetOnItemClickListener (new AdapterView. OnItemClickListener () {
@ Override 
Public void onItemClick (AdapterView<?> The parent, View View, int position, long id) {
//there is no writing? 
} 
}); 

CodePudding user response: