Android Open Source - ListIndex Main Activity

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License

The source code is released under:

Apache License

Java Source Code

package com.nozomi.listindex.demo;
/* w w  w  . ja v a 2s.co  m*/
import java.util.ArrayList;
import java.util.Collections;
import java.util.Random;

import com.nozomi.listindex.R;
import com.nozomi.listindex.view.IndexComparator;
import com.nozomi.listindex.view.IndexView;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

public class MainActivity extends Activity {

  private Random random = new Random();
  private ArrayList<Item> itemArray = new ArrayList<Item>();

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main_activity);

    initView();
  }

  private void initView() {

    final ListView itemListView = (ListView) findViewById(R.id.item_list);
    for (int i = 0; i < 300; i++) {
      itemArray.add(new Item(generateRandomWord(), R.drawable.nozomi));
    }

    Collections.sort(itemArray, new IndexComparator());
    ItemAdapter itemAdapter = new ItemAdapter(this);
    itemListView.setAdapter(itemAdapter);
    TextView selectIndexView = (TextView) findViewById(R.id.select_index);

    IndexView indexView = (IndexView) findViewById(R.id.index);
    indexView.init(itemListView, selectIndexView);

  }

  private class ItemAdapter extends BaseAdapter {

    private Context context;

    public ItemAdapter(Context context) {
      this.context = context;
    }

    @Override
    public int getCount() {
      return itemArray.size();
    }

    @Override
    public Object getItem(int position) {
      return itemArray.get(position);
    }

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
      final ViewHolder holder;
      if (convertView == null) {
        holder = new ViewHolder();
        convertView = LayoutInflater.from(context).inflate(
            R.layout.item, null, false);

        holder.picView = (ImageView) convertView.findViewById(R.id.pic);
        holder.nameView = (TextView) convertView
            .findViewById(R.id.name);

        convertView.setTag(holder);
      } else {
        holder = (ViewHolder) convertView.getTag();
      }
      Item item = itemArray.get(position);
      String name = item.getName();
      holder.picView.setImageResource(item.getPic());
      holder.nameView.setText(name);

      return convertView;
    }

    private class ViewHolder {
      ImageView picView;
      TextView nameView;
    }
  }

  private String generateRandomWord() {

    int length = 1 + random.nextInt(5);
    StringBuilder sb = new StringBuilder();
    for (int i = 0; i < length; i++) {
      sb.append((char) (32 + random.nextInt(127 - 32)));
    }
    return sb.toString();
  }
}

Java Source Code List

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