Android联系人姓氏提示

自己用着M1S，感觉里面的联系人姓氏提示功能不错，用起来挺好的，就自己做了个比较简单的类似于这样的功能，代码如下：

package com.fnd.ui;import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;import android.os.Bundle;
import android.os.Handler;
import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;public class MainActivity extends Activity {private TextView tv_displayfamilyname;private ListView lv_displaylinkman;private String[] linkmanStrings = new String[] { "涂bing", "刘", "张fa", "徐","美", "郭", "王", "赵", "燕", "平三", "汗", "好哈", "新", "涂", "二", "三", "八戒","猴哥", "钟", "雨", "填", "张", "涂", "刘", "张", "徐", "美", "郭", "王", "赵","燕", "平", "汗", "好哈", "新", "涂", "二", "三", "八戒", "猴哥", "钟", "雨", "填","张", "涂", "刘", "张", "徐", "美", "郭", "王", "赵", "燕", "平", "汗", "好哈","新", "涂", "二", "三", "八戒", "猴哥", "钟", "雨", "填", "张" };private String firstdisplaystring;private boolean isshowing;private String predisplaystring;private Runnable displayrunnable;private int displaycount = 0;Handler handler = new Handler();@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);tv_displayfamilyname = (TextView) findViewById(R.id.tv_displayfamilyname);lv_displaylinkman = (ListView) findViewById(R.id.lv_displaylinkman);//给ListView添加一个滚动监听器lv_displaylinkman.setOnScrollListener(new DisplayLinkmanOnScrollListener());List<Map<String, Object>> stringlist = new ArrayList<Map<String, Object>>();for (String str : linkmanStrings) {Map<String, Object> map = new HashMap<String, Object>();map.put("name", str);stringlist.add(map);}ListItemAdapter lia = new ListItemAdapter(MainActivity.this,stringlist, R.layout.ll_lvdisplaylinkman_item,new String[] { "name" }, new int[] { R.id.tv_item });lv_displaylinkman.setAdapter(lia);tv_displayfamilyname.setVisibility(View.INVISIBLE);displayrunnable = new DisplayRunnable();}final class DisplayLinkmanOnScrollListener implements OnScrollListener {//存储当前屏最上层Item在ListView中的位置private int firstVisibleItem = 0;@Overridepublic void onScroll(AbsListView view, int firstVisibleItem,int visibleItemCount, int totalItemCount) {this.firstVisibleItem = firstVisibleItem;}@Overridepublic void onScrollStateChanged(AbsListView view, int scrollState) {switch (scrollState) {case OnScrollListener.SCROLL_STATE_IDLE://当滑动停止// 提取出姓氏(当前屏中间Item)firstdisplaystring = linkmanStrings[firstVisibleItem+ displaycount / 2].substring(0, 1);if (!isshowing && !firstdisplaystring.equals(predisplaystring)) {tv_displayfamilyname.setVisibility(View.VISIBLE);isshowing = true;}tv_displayfamilyname.setText(firstdisplaystring);//移除当前消息队列Runnablehandler.removeCallbacks(displayrunnable);//添加新的消息队列Runnablehandler.postDelayed(displayrunnable, 2000);break;}}}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {getMenuInflater().inflate(R.menu.activity_main, menu);return true;}final class DisplayRunnable implements Runnable {@Overridepublic void run() {isshowing = false;tv_displayfamilyname.setVisibility(View.INVISIBLE);}}final class ListItemAdapter extends SimpleAdapter {LayoutInflater mInflater;List<Map<String, Object>> stringlist;public ListItemAdapter(Context context,List<Map<String, Object>> stringlist, int resource,String[] from, int[] to) {super(context, stringlist, resource, from, to);mInflater = LayoutInflater.from(context);this.stringlist = stringlist;}@Overridepublic int getCount() {return super.getCount();}@Overridepublic Object getItem(int position) {return super.getItem(position);}@Overridepublic long getItemId(int position) {return super.getItemId(position);}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {ViewHolder holder;if (convertView == null) {convertView = mInflater.inflate(R.layout.ll_lvdisplaylinkman_item, null);holder = new ViewHolder();holder.name = (TextView) convertView.findViewById(R.id.tv_item);convertView.setTag(holder);} else {holder = (ViewHolder) convertView.getTag();}System.out.println("position:" + position);System.out.println("stringlist size:" + stringlist.size());int lv_height = lv_displaylinkman.getHeight();int item_height = convertView.getHeight();System.out.println("lv_height:" + lv_height);System.out.println("item_height:" + item_height);// 算出手机一屏显示ListView Item的个数if (item_height != 0) {displaycount = lv_height / item_height;}holder.name.setText((String) stringlist.get(position).get("name"));return convertView;}}static class ViewHolder {TextView name;}
}

上面只实现了非常简单的功能，有兴趣的话可以实现非常丰富的功能。

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