android城市列表特效-触摸查找源码

package com.city.list.main; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import com.city.list.db.DBManager; import com.city.list.main.MyLetterListView.OnTouchingLetterChangedListener; import android.app.Activity; import android.content.Context; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; import android.graphics.PixelFormat; 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.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.BaseAdapter; import android.widget.ListView; import android.widget.TextView; import android.widget.Toast; /** * 城市列表 * * @author sy * */ public class CityList extends Activity { private BaseAdapter adapter; private ListView mCityLit; private TextView overlay; private MyLetterListView letterListView; 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; private SQLiteDatabase database; private ArrayList<CityModel> mCityNames; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.city_list); mCityLit = (ListView) findViewById(R.id.city_list); letterListView = (MyLetterListView) findViewById(R.id.cityLetterListView); DBManager dbManager = new DBManager(this); dbManager.openDateBase(); dbManager.closeDatabase(); database = SQLiteDatabase.openOrCreateDatabase(DBManager.DB_PATH + "/" + DBManager.DB_NAME, null); mCityNames = getCityNames(); database.close(); letterListView.setOnTouchingLetterChangedListener(new LetterListViewListener()); alphaIndexer = new HashMap<String, Integer>(); handler = new Handler(); overlayThread = new OverlayThread(); initOverlay(); setAdapter(mCityNames); mCityLit.setOnItemClickListener(new CityListOnItemClick()); } /** * 从数据库获取城市数据 * * @return */ private ArrayList<CityModel> getCityNames() { ArrayList<CityModel> names = new ArrayList<CityModel>(); Cursor cursor = database.rawQuery("SELECT * FROM T_City ORDER BY NameSort", null); for (int i = 0; i < cursor.getCount(); i++) { cursor.moveToPosition(i); CityModel cityModel = new CityModel(); cityModel.setCityName(cursor.getString(cursor.getColumnIndex("CityName"))); cityModel.setNameSort(cursor.getString(cursor.getColumnIndex("NameSort"))); names.add(cityModel); } return names; } /** * 城市列表点击事件 * * @author sy * */ class CityListOnItemClick implements OnItemClickListener { @Override public void onItemClick(AdapterView<?> arg0, View arg1, int pos, long arg3) { CityModel cityModel = (CityModel) mCityLit.getAdapter().getItem(pos); Toast.makeText(CityList.this, cityModel.getCityName(), Toast.LENGTH_SHORT).show(); } } /** * 为ListView设置适配器 * * @param list */ private void setAdapter(List<CityModel> list) { if (list != null) { adapter = new ListAdapter(this, list); mCityLit.setAdapter(adapter); } } /** * ListViewAdapter * * @author sy * */ private class ListAdapter extends BaseAdapter { private LayoutInflater inflater; private List<CityModel> list; public ListAdapter(Context context, List<CityModel> 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 // getAlpha(list.get(i)); String currentStr = list.get(i).getNameSort(); // 上一个汉语拼音首字母，如果不存在为“ ” String previewStr = (i - 1) >= 0 ? list.get(i - 1).getNameSort() : " "; if (!previewStr.equals(currentStr)) { String name = list.get(i).getNameSort(); 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); convertView.setTag(holder); } else { holder = (ViewHolder) convertView.getTag(); } holder.name.setText(list.get(position).getCityName()); String currentStr = list.get(position).getNameSort(); String previewStr = (position - 1) >= 0 ? list.get(position - 1).getNameSort() : " "; 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; } } // 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); mCityLit.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); } } }