城市列表切换

package com.bwei.city;

import java.util.ArrayList;
import java.util.List;

import android.R.bool;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity implements OnItemClickListener {

	String[] letter = { "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K",
			"L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X",
			"Y", "Z" };

	String[] city = { "C", "B", "H", "G", "W", "C", "S", "S", "C", "W", "H",
			"Z", "C", "D", "N", "L", "Q", "S", "S", "L", "N", "H", "X", "H",
			"S", "Z", "G", "N", "J", "T", "S", "X", "A" };
	String[] cityName = { "长沙", "北京", "杭州", "广州", "武汉", "重庆", "上海", "深圳", "长春",
			"乌鲁木齐", "哈尔滨", "郑州", "成都", "大连", "南昌", "兰州", "齐齐哈尔", "汕头", "苏州",
			"拉萨", "南京", "呼和浩特", "厦门", "合肥", "沈阳", "张家界", "贵州", "宁夏", "济南",
			"天津", "石家庄", "西安", "澳门" };

	List<String> list = new ArrayList<>();

	private ListView left_lv;

	private ListView right_lv;

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

		for (int i = 0; i < letter.length; i++) {

			boolean flag = false;

			for (int j = 0; j < city.length; j++) {
				//s
				if(letter[i].equals(city[j])){
					
					if(!flag){
						flag =true;
						//加载城市对应的字母  s
						list.add(letter[i]);
					}
					//加哉城市
					list.add(cityName[j]);
					
				}
				
			}

		}

		left_lv = (ListView) findViewById(R.id.left_lv);

		right_lv = (ListView) findViewById(R.id.right_lv);

		left_lv.setAdapter(new leftAdapter());
		right_lv.setAdapter(new RightAdapter());
		
		
		left_lv.setOnItemClickListener(this);
		right_lv.setOnItemClickListener(this);
	}

	class leftAdapter extends BaseAdapter {

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

		@Override
		public Object getItem(int position) {
			return null;
		}

		@Override
		public int getItemViewType(int position) {
			
			for (int i = 0; i < letter.length; i++) {
				
				if(letter[i].equals(list.get(position))){
					
					return 0;
				}
				
			}
			
			return 1;
		}

		@Override
		public int getViewTypeCount() {
			return 2;
		}

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

		@Override
		public View getView(int position, View convertView, ViewGroup parent) {
			
			int type = getItemViewType(position);
			
			if(convertView==null){
				switch (type) {
				case 0:
					convertView =View.inflate(MainActivity.this, R.layout.left_item1, null);
					
					break;

				case 1:
					
					convertView =View.inflate(MainActivity.this, R.layout.left_item2, null);
					break;

				
				}
				
				
				
			}
			
			TextView left_item1_tv = (TextView) convertView.findViewById(R.id.left_item1_tv);
			TextView left_item2_tv = (TextView) convertView.findViewById(R.id.left_item2_tv);
			
			switch (type) {
			case 0:
				left_item1_tv.setText(list.get(position));
				
				break;
				
			case 1:
				left_item2_tv.setText(list.get(position));
				break;

			
			}
			
			
			return convertView;
		}

	}

	class RightAdapter extends BaseAdapter {

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

		@Override
		public Object getItem(int position) {
			return null;
		}

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

		@Override
		public View getView(int position, View convertView, ViewGroup parent) {
			if(convertView==null){
				convertView = View.inflate(MainActivity.this, R.layout.right_item, null);
			}
			TextView right_item_tv = (TextView) convertView.findViewById(R.id.right_item_tv);
			
			right_item_tv.setText(letter[position]);
			return convertView;
		}

	}

	@Override
	public void onItemClick(AdapterView<?> parent, View view, int position,
			long id) {
		
		switch (parent.getId()) {
		case R.id.left_lv:
			boolean isLetter = false;
			for (int i = 0; i < letter.length; i++) {
				//如果letter[i] ==list.get(position) 说明我现在点击的是字母
				if(letter[i].equals(list.get(position))){
					isLetter = true;
					break;
				}
				
			}
			
			if(!isLetter){
				Toast.makeText(MainActivity.this, list.get(position), 0).show();
			}
			
			
			break;
			
		case R.id.right_lv:
			
			for (int i = 0; i < list.size(); i++) {
				if(letter[position].equals(list.get(i))){
					//根据索引跳到指定的位置
					left_lv.setSelection(i);
					
				}
				
			}
			
			break;

		
		}
		
	}

}