Adding Markers in Google Map and Focusing Camera when map loaded

How to Add Section Indexers in a Android List View

Crete the Adapter for list view .

   
public class ContactsAdapter extends BaseAdapter implements SectionIndexer {

    Context context;
    String[] strings;
    String[] sections ;
    HashMap alphaIndexer;


    public ContactsAdapter(Context context, String[] strings) {
        this.context = context;
        this.strings = strings;
        alphaIndexer = new HashMap();
        int size = strings.length;

        for (int x = 0; x < size; x++) {
            String s = strings[x];
            String ch = s.substring(0, 1);
            ch = ch.toUpperCase();
            if (!alphaIndexer.containsKey(ch))
                alphaIndexer.put(ch, x);
        }

        Set sectionLetters = alphaIndexer.keySet();
        ArrayList sectionList = new ArrayList<>(sectionLetters);
        Collections.sort(sectionList);
        sections = new String[sectionList.size()];
        sectionList.toArray(sections);

    }

    @Override
    public int getCount() {
        return strings.length;
    }

    @Override
    public Object getItem(int position) {
        return strings[position];
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

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


        ViewHolder holder;
        if (convertView == null) {
            convertView = LayoutInflater.from(context).inflate(R.layout.main, parent, false);
            holder = new ViewHolder();
            holder.text = (TextView) convertView.findViewById(R.id.tv_contact);
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        holder.text.setText(strings[position]);

        return convertView;
    }

    @Override
    public Object[] getSections() {

        return sections;
    }

    @Override
    public int getPositionForSection(int sectionIndex) {
        return alphaIndexer.get(sections[sectionIndex]);
    }

    @Override
    public int getSectionForPosition(int position) {
        return 0;
    }

    static class ViewHolder {
        TextView text;
    }
}

list Row for your adapter class

In your activity Initialize the list view and set adapter thats all

 
 
public class Registration extends BaseActivity{

 private ListView listview;
 @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

          listview = (ListView) findViewById(R.id.listView);

               ContactsAdapter contactsAdapter = new ContactsAdapter(Registration.this,YourArry[]);

        listview.setAdapter(contactsAdapter);

        listview.setFastScrollEnabled(true);


    }
}

thats all ,