android快速滑动列表+首字母提示(仿通讯录，iphone)

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 Activity01 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"); } //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); 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)); 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 getA