学步园

功能的实现结合了网上很多非常的好的实现，小小的优化看下。

实现思路：

1. 获取手机联系人列表：通过Uri uri = Uri.parse("content://com.android.contacts/data/phones");  查询联系人列表

2 联系人的字段非常的多，摘取了NAME = "name", NUMBER = "number", SORT_KEY = "sort_key";姓名，电话号码，以及非常重要的sort_key 字段，

      在之前做项目，而是通过导入的拼音包转化的，这是看网上学的，非常的不错。

3 得到联系列表，则通过listview显示，显示的时候进行A--Z分组显示， 这个也好办，因为通过sort_key已经得到了从A--Z的排序，只要判断是否属于同一字符下，是则不显示，不是则显示，同时把该条设置分组标题

4 安字母分组显示完全后，发现联系人一多，定位到某一个分组下也很大的力气，上面加上一个搜索的话，又懒得输入，因为手机嘛，操作不变，如果能选择，并且直接定位到

该分组下面，那就容易了，因为人再懒，让你去摸一下还是不费力气的，并且体验的效果也不错

所以废话不多说，就是在右边需要一个A--z竖直排列的字母表，能选择，并且能够定位到该字母的分组。

定位到分组这还容易，用为listview为咋门提供了方法setSelection（postion）就ok 能定位了

关键是实现右边的点击，并且知道你点击的字母：

5 。 首先是布局，布局方式很多，直接帧布局把他定义在右边，但发现相对布局也行，而且更简单

package com.droid;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.regex.Pattern;

import android.app.Activity;
import android.content.AsyncQueryHandler;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.graphics.PixelFormat;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.view.WindowManager;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;

import com.droid.MyLetterListView.OnTouchingLetterChangedListener;

public class ContactList extends Activity {
	private BaseAdapter adapter;  
    private ListView personList;
    private TextView overlay;
    private MyLetterListView letterListView;
    private AsyncQueryHandler asyncQuery;  
    private static final String NAME = "name", NUMBER = "number", SORT_KEY = "sort_key";
    private HashMap<String, Integer> alphaIndexer;//存放存在的汉语拼音首字母和与之对应的列表位置
    private String[] sections;//存放存在的汉语拼音首字母
    private Handler handler;
    private OverlayThread overlayThread;
  
    @Override  
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.main);  
        
        personList = (ListView) findViewById(R.id.list_view);
        letterListView = (MyLetterListView) findViewById(R.id.MyLetterListView01);
        letterListView.setOnTouchingLetterChangedListener(new LetterListViewListener());
        
        asyncQuery = new MyAsyncQueryHandler(getContentResolver());
        alphaIndexer = new HashMap<String, Integer>();
        handler = new Handler();
        overlayThread = new OverlayThread();
        initOverlay();
    }  
  
    @Override  
    protected void onResume() {  
        super.onResume();  
        Uri uri = Uri.parse("content://com.android.contacts/data/phones");  
        String[] projection = { "_id", "display_name", "data1", "sort_key" };  
        asyncQuery.startQuery(0, null, uri, projection, null, null,  
                "sort_key COLLATE LOCALIZED asc");
       
    }  
  
    //异步查询联系人
    private class MyAsyncQueryHandler extends AsyncQueryHandler {  
  
        public MyAsyncQueryHandler(ContentResolver cr) {  
            super(cr);  
  
        }  
  
        @Override  
        protected void onQueryComplete(int token, Object cookie, Cursor cursor) {  
            if (cursor != null && cursor.getCount() > 0) {  
                List<ContentValues> list = new ArrayList<ContentValues>();  
                cursor.moveToFirst();  
                for (int i = 0; i < cursor.getCount(); i++) {
                    ContentValues cv = new ContentValues();  
                    cursor.moveToPosition(i);  
                    String name = cursor.getString(1);  
                    String number = cursor.getString(2);  
                    String sortKey = cursor.getString(3);
                    System.out.println(sortKey);
                    if (number.startsWith("+86")) {  
                        cv.put(NAME, name);  
                        cv.put(NUMBER, number.substring(3));  //去掉+86
                        cv.put(SORT_KEY, sortKey);  
                    } else {  
                        cv.put(NAME, name);  
                        cv.put(NUMBER, number);  
                        cv.put(SORT_KEY, sortKey);  
                    }  
                    list.add(cv);  
                }  
                if (list.size() > 0) {  
                    setAdapter(list);  
                }  
            }  
        }  
  
    }  
  
    private void setAdapter(List<ContentValues> list) {
    	adapter = new ListAdapter(this, list);
        personList.setAdapter(adapter);  
  
    }
    
    private class ListAdapter extends BaseAdapter {
    	 private LayoutInflater inflater;  
         private List<ContentValues> list;
    	
    	public ListAdapter(Context context, List<ContentValues> list) {
    		this.inflater = LayoutInflater.from(context);
    		this.list = list;
    		alphaIndexer = new HashMap<String, Integer>();
    		sections = new String[list.size()];
    		
    		for (int i = 0; i < list.size(); i++) {
    			//当前汉语拼音首字母
    			String currentStr = getAlpha(list.get(i).getAsString(SORT_KEY));
    			//上一个汉语拼音首字母，如果不存在为“ ”
                String previewStr = (i - 1) >= 0 ? getAlpha(list.get(i - 1).getAsString(SORT_KEY)) : " ";
                if (!previewStr.equals(currentStr)) {
                	String name = getAlpha(list.get(i).getAsString(SORT_KEY));
                	alphaIndexer.put(name, i);  
                	sections[i] = name; 
                }
            }
    	}
    	
		@Override
		public int getCount() {
			return list.size();
		}

		@Override
		public Object getItem(int position) {
			return list.get(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 = inflater.inflate(R.layout.list_item, null);
                holder = new ViewHolder();  
                holder.alpha = (TextView) convertView.findViewById(R.id.alpha);  
                holder.name = (TextView) convertView.findViewById(R.id.name);  
                holder.number = (TextView) convertView.findViewById(R.id.number);  
                convertView.setTag(holder);  
            } else {  
                holder = (ViewHolder) convertView.getTag();  
            }  
            ContentValues cv = list.get(position);  
            holder.name.setText(cv.getAsString(NAME));
            holder.number.setText(cv.getAsString(NUMBER));
            String currentStr = getAlpha(list.get(position).getAsString(SORT_KEY));//当前字母
            String previewStr = (position - 1) >= 0 ? getAlpha(list.get(position - 1).getAsString(SORT_KEY)) : " ";
            if (!previewStr.equals(currentStr)) {  
                holder.alpha.setVisibility(View.VISIBLE);
                holder.alpha.setText(currentStr);
            } else {  
                holder.alpha.setVisibility(View.GONE);
            }  
            return convertView;  
		}
		
		private class ViewHolder {
			TextView alpha;  
            TextView name;  
            TextView number;
		}
    	
    }
    
    //初始化汉语拼音首字母弹出提示框
    private void initOverlay() {
    	LayoutInflater inflater = LayoutInflater.from(this);
    	overlay = (TextView) inflater.inflate(R.layout.overlay, null);
    	overlay.setVisibility(View.INVISIBLE);
		WindowManager.LayoutParams lp = new WindowManager.LayoutParams(
				LayoutParams.WRAP_CONTENT, 
				LayoutParams.WRAP_CONTENT,
				WindowManager.LayoutParams.TYPE_APPLICATION,
				WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE| WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE,
				PixelFormat.TRANSLUCENT);
		WindowManager windowManager = (WindowManager) this.getSystemService(Context.WINDOW_SERVICE);
		windowManager.addView(overlay, lp);
    }
    
    private class LetterListViewListener implements OnTouchingLetterChangedListener{

		@Override
		public void onTouchingLetterChanged(final String s) {
			if(alphaIndexer.get(s) != null) {
				int position = alphaIndexer.get(s);
				personList.setSelection(position);
				overlay.setText(sections[position]);
				overlay.setVisibility(View.VISIBLE);
				handler.removeCallbacks(overlayThread);
				//延迟一秒后执行，让overlay为不可见
				handler.postDelayed(overlayThread, 1500);
			} 
		}
    	
    }
    
    //设置overlay不可见
    private class OverlayThread implements Runnable {

		@Override
		public void run() {
			overlay.setVisibility(View.GONE);
		}
    	
    }
    
    
	//获得汉语拼音首字母
    private String getAlpha(String str) {  
        if (str == null) {  
            return "#";  
        }  
  
        if (str.trim().length() == 0) {  
            return "#";  
        }  
  
        char c = str.trim().substring(0, 1).charAt(0);  
        // 正则表达式，判断首字母是否是英文字母  
        Pattern pattern = Pattern.compile("^[A-Za-z]+$");  
        if (pattern.matcher(c + "").matches()) {  
            return (c + "").toUpperCase();  
        } else {  
            return "#";  
        }  
    }  
  
}  

package com.droid;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Typeface;
import android.text.style.TypefaceSpan;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;


public class MyLetterListView extends View {
	
	OnTouchingLetterChangedListener onTouchingLetterChangedListener;
	String[] b = {"#","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"};
	int choose = -1;
	Paint paint = new Paint();
	boolean showBkg = false;

	public MyLetterListView(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
	}

	public MyLetterListView(Context context, AttributeSet attrs) {
		super(context, attrs);
	}

	public MyLetterListView(Context context) {
		super(context);
	}
	
	@Override
	protected void onDraw(Canvas canvas) {
		super.onDraw(canvas);
		if(showBkg){
		    canvas.drawColor(Color.parseColor("#40000000"));
		}
		
	    int height = getHeight();
	    int width = getWidth();
	    int singleHeight = height / b.length;
	    for(int i=0;i<b.length;i++){
	       paint.setColor(Color.WHITE);
	       paint.setTypeface(Typeface.DEFAULT_BOLD);
	       paint.setAntiAlias(true);
	       if(i == choose){
	    	   paint.setColor(Color.parseColor("#3399ff"));
	    	   paint.setFakeBoldText(true);
	       }
	       float xPos = width/2  - paint.measureText(b[i])/2;
	       float yPos = singleHeight * i + singleHeight;
	       canvas.drawText(b[i], xPos, yPos, paint);
	       paint.reset();
	    }
	   
	}
	
	@Override
	public boolean dispatchTouchEvent(MotionEvent event) {
		final int action = event.getAction();
	    final float y = event.getY();
	    final int oldChoose = choose;
	    final OnTouchingLetterChangedListener listener = onTouchingLetterChangedListener;
	    final int c = (int) (y/getHeight()*b.length);
	    
		switch (action) {
			case MotionEvent.ACTION_DOWN:
				showBkg = true;
				if(oldChoose != c && listener != null){
					if(c > 0 && c< b.length){
						listener.onTouchingLetterChanged(b[c]);
						choose = c;
						invalidate();
					}
				}
				
				break;
			case MotionEvent.ACTION_MOVE:
				if(oldChoose != c && listener != null){
					if(c > 0 && c< b.length){
						listener.onTouchingLetterChanged(b[c]);
						choose = c;
						invalidate();
					}
				}
				break;
			case MotionEvent.ACTION_UP:
				showBkg = false;
				choose = -1;
				invalidate();
				break;
		}
		return true;
	}

	@Override
	public boolean onTouchEvent(MotionEvent event) {
		return super.onTouchEvent(event);
	}

	public void setOnTouchingLetterChangedListener(
			OnTouchingLetterChangedListener onTouchingLetterChangedListener) {
		this.onTouchingLetterChangedListener = onTouchingLetterChangedListener;
	}

	public interface OnTouchingLetterChangedListener{
		public void onTouchingLetterChanged(String s);
	}
	
}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent">

	<TextView
		android:id="@+id/alpha"
		android:layout_width="fill_parent"
  		android:layout_height="wrap_content"
  		android:paddingLeft="13dip"
  		android:background="#333333"
		android:textColor="#99CCFF"
		android:textAppearance="?android:textAppearanceMedium"
		android:visibility="gone" />
		
	<ImageView
		android:id="@+id/image_view"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:layout_alignParentLeft="true"
		android:layout_marginRight="5.0dip"
		android:src="@drawable/contact_list_icon"
		android:layout_below="@id/alpha" />
		
    <TextView
    	android:id="@+id/name"
    	android:textAppearance="?android:textAppearanceMedium"
    	android:layout_width="wrap_content"
    	android:layout_height="wrap_content"
    	android:layout_marginLeft="2.0dip"
    	android:layout_marginTop="6.0dip"
    	android:layout_marginRight="5.0dip"
    	android:singleLine="true"
    	android:layout_toRightOf="@id/image_view"
    	android:layout_alignTop="@id/image_view" />
    	
    <TextView
    	android:id="@+id/number"
    	android:textAppearance="?android:textAppearanceSmall"
    	android:ellipsize="marquee"
    	android:layout_width="wrap_content"
    	android:layout_height="wrap_content"

<?xml version="1.0" encoding="utf-8"?>  
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    android:orientation="vertical"  
    android:layout_width="fill_parent"  
    android:layout_height="fill_parent" > 
     
    <ListView android:id="@+id/list_view" 
		android:layout_height="wrap_content" 
		android:layout_width="fill_parent"
		android:scrollbars="none"
		android:cacheColorHint="#00000000" />
    <com.droid.MyLetterListView 
    	android:id="@+id/MyLetterListView01" 
		android:background="#40000000" 
		android:layout_width="30dip" 
		android:layout_height="fill_parent"
		android:layout_alignParentRight="true" />
</RelativeLayout> 

<TextView
  	xmlns:android="http://schemas.android.com/apk/res/android"
  	android:textSize="70sp"
    android:textColor="#3399ff"
    android:background="#ffffff"  
    android:minWidth="80dip"  
    android:maxWidth="80dip"  
    android:padding="5dip"
    android:gravity="center" 
/>
list_item.xml


main.xml


overlay.xml