ListView快速滚动加首字母提示

转载：http://marshal.easymorse.com/archives/3934

main.xml:

<?xml version="1.0" encoding="utf-8"?><LinearLayout 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/listView" android:layout_width="fill_parent"android:layout_height="fill_parent" android:fastScrollEnabled="true"android:focusable="true" /></LinearLayout>

overlay.xml:

<?xml version="1.0" encoding="utf-8"?><TextView xmlns:android="http://schemas.android.com/apk/res/android"android:minWidth="80dp" android:maxWidth="80dp" android:gravity="center"android:textSize="70sp" android:textColor="#ffffffff"android:background="#99000088" android:padding="10dp" android:visibility="invisible"/>

ListViewActivity.java:

public class ListViewActivity extends Activity {private String[] items = { "Abbaye de Belloc", "Abbaye du Mont des Cats","Abertam", "Abondance", "Ackawi", "Acorn", "Adelost","Affidelice au Chablis", "Afuega'l Pitu", "Airag", "Airedale","Aisy Cendre", "Allgauer Emmentaler", "Alverca", "Ambert","American Cheese", "Ami du Chambertin", "Anejo Enchilado","Anneau du Vic-Bilh", "Anthoriro", "Appenzell", "Aragon","Ardi Gasna", "Ardrahan", "Armenian String","Aromes au Gene de Marc", "Asadero", "Asiago", "Aubisque Pyrenees","Autun", "Avaxtskyr", "Baby Swiss", "Babybel","Baguette Laonnaise", "Bakers", "Baladi", "Balaton", "Bandal","Banon", "Barry's Bay Cheddar", "Basing", "Basket Cheese","Bath Cheese", "Bavarian Bergkase", "Baylough", "Beaufort","Beauvoorde", "Beenleigh Blue", "Beer Cheese", "Bel Paese","Bergader", "Bergere Bleue", "Berkswell", "Beyaz Peynir","Bierkase", "Bishop Kennedy", "Blarney", "Bleu d'Auvergne","Bleu de Gex", "Bleu de Laqueuille", "Bleu de Septmoncel","Bleu Des Causses", "Blue", "Blue Castello", "Blue Rathgore","Blue Vein (Australian)", "Blue Vein Cheeses", "Bocconcini","Bocconcini (Australian)", "Boeren Leidenkaas", "Bonchester","Bosworth", "Bougon", "Boule Du Roves", "Boulette d'Avesnes","Boursault", "Boursin", "Bouyssou", "Bra", "Braudostur","Breakfast Cheese", "Brebis du Lavort", "Brebis du Lochois","Brebis du Puyfaucon", "Bresse Bleu", "Brick", "Brie","Brie de Meaux", "Brie de Melun", "Brillat-Savarin", "Brin","Brin d' Amour", "Brin d'Amour", "Brinza (Burduf Brinza)","Briquette de Brebis", "Briquette du Forez", "Broccio","Broccio Demi-Affine", "Brousse du Rove", "Bruder Basil","Brusselae Kaas (Fromage de Bruxelles)", "Bryndza","Buchette d'Anjou", "Buffalo", "Burgos", "Butte", "Butterkase","Button (Innes)", "Buxton Blue", "Cabecou", "Caboc", "Cabrales","Cachaille", "Caciocavallo", "Caciotta", "Caerphilly","Cairnsmore", "Calenzana", "Cambazola", "Camembert de Normandie","Canadian Cheddar", "Canestrato", "Cantal", "Caprice des Dieux","Capricorn Goat", "Capriole Banon", "Carre de l'Est","Casciotta di Urbino", "Cashel Blue", "Castellano", "Castelleno","Castelmagno", "Castelo Branco", "Castigliano", "Cathelain","Celtic Promise", "Cendre d'Olivet", "Cerney", "Chabichou","Chabichou du Poitou", "Chabis de Gatine", "Chaource", "Charolais","Chaumes", "Cheddar", "Cheddar Clothbound", "Cheshire", "Chevres","Chevrotin des Aravis", "Chontaleno", "Civray","Coeur de Camembert au Calvados", "Coeur de Chevre", "Colby","Cold Pack", "Comte", "Coolea", "Cooleney", "Coquetdale","Corleggy", "Cornish Pepper", "Cotherstone", "Cotija","Cottage Cheese", "Cottage Cheese (Australian)", "Cougar Gold","Coulommiers", "Coverdale", "Crayeux de Roncq", "Cream Cheese","Cream Havarti", "Crema Agria", "Crema Mexicana", "Creme Fraiche","Crescenza", "Croghan", "Crottin de Chavignol","Crottin du Chavignol", "Crowdie", "Crowley", "Cuajada", "Curd","Cure Nantais", "Curworthy", "Cwmtawe Pecorino","Cypress Grove Chevre", "Danablu (Danish Blue)", "Danbo","Danish Fontina", "Daralagjazsky", "Dauphin", "Delice des Fiouves","Denhany Dorset Drum", "Derby", "Dessertnyj Belyj", "Devon Blue","Devon Garland", "Dolcelatte", "Doolin", "Doppelrhamstufel","Dorset Blue Vinney", "Double Gloucester", "Double Worcester","Dreux a la Feuille", "Dry Jack", "Duddleswell", "Dunbarra","Dunlop", "Dunsyre Blue", "Duroblando", "Durrus","Dutch Mimolette (Commissiekaas)", "Edam", "Edelpilz","Emental Grand Cru", "Emlett", "Emmental", "Epoisses de Bourgogne","Esbareich", "Esrom", "Etorki", "Evansdale Farmhouse Brie","Evora De L'Alentejo", "Exmoor Blue", "Explorateur", "Feta","Feta (Australian)", "Figue", "Filetta", "Fin-de-Siecle","Finlandia Swiss", "Finn", "Fiore Sardo", "Fleur du Maquis","Flor de Guia", "Flower Marie", "Folded","Folded cheese with mint", "Fondant de Brebis", "Fontainebleau","Fontal", "Fontina Val d'Aosta", "Formaggio di capra", "Fougerus","Four Herb Gouda", "Fourme d' Ambert", "Fourme de Haute Loire","Fourme de Montbrison", "Fresh Jack", "Fresh Mozzarella","Fresh Ricotta", "Fresh Truffles", "Fribourgeois", "Friesekaas","Friesian", "Friesla", "Frinault", "Fromage a Raclette","Fromage Corse", "Fromage de Montagne de Savoie", "Fromage Frais","Fruit Cream Cheese", "Frying Cheese", "Fynbo", "Gabriel","Galette du Paludier", "Galette Lyonnaise","Galloway Goat's Milk Gems", "Gammelost", "Gaperon a l'Ail","Garrotxa", "Gastanberra", "Geitost", "Gippsland Blue", "Gjetost","Gloucester", "Golden Cross", "Gorgonzola", "Gornyaltajski","Gospel Green", "Gouda", "Goutu", "Gowrie", "Grabetto", "Graddost","Grafton Village Cheddar", "Grana", "Grana Padano", "Grand Vatel","Grataron d' Areches", "Gratte-Paille", "Graviera", "Greuilh","Greve", "Gris de Lille", "Gruyere", "Gubbeen", "Guerbigny","Halloumi", "Halloumy (Australian)", "Haloumi-Style Cheese","Harbourne Blue", "Havarti", "Heidi Gruyere", "Hereford Hop","Herrgardsost", "Herriot Farmhouse", "Herve", "Hipi Iti","Hubbardston Blue Cow", "Hushallsost", "Iberico", "Idaho Goatster","Idiazabal", "Il Boschetto al Tartufo", "Ile d'Yeu","Isle of Mull", "Jarlsberg", "Jermi Tortes", "Jibneh Arabieh","Jindi Brie", "Jubilee Blue", "Juustoleipa", "Kadchgall", "Kaseri","Kashta", "Kefalotyri", "Kenafa", "Kernhem", "Kervella Affine","Kikorangi", "King Island Cape Wickham Brie", "King River Gold","Klosterkaese", "Knockalara", "Kugelkase", "L'Aveyronnais","L'Ecir de l'Aubrac", "La Taupiniere", "La Vache Qui Rit","Laguiole", "Lairobell", "Lajta", "Lanark Blue", "Lancashire","Langres", "Lappi", "Laruns", "Lavistown", "Le Brin","Le Fium Orbo", "Le Lacandou", "Le Roule", "Leafield", "Lebbene","Leerdammer", "Leicester", "Leyden", "Limburger","Lincolnshire Poacher", "Lingot Saint Bousquet d'Orb", "Liptauer","Little Rydings", "Livarot", "Llanboidy", "Llanglofan Farmhouse","Loch Arthur Farmhouse", "Loddiswell Avondale", "Longhorn","Lou Palou", "Lou Pevre", "Lyonnais", "Maasdam", "Macconais","Mahoe Aged Gouda", "Mahon", "Malvern", "Mamirolle", "Manchego","Manouri", "Manur", "Marble Cheddar", "Marbled Cheeses","Maredsous", "Margotin", "Maribo", "Maroilles", "Mascares","Mascarpone", "Mascarpone (Australian)", "Mascarpone Torta","Matocq", "Maytag Blue", "Meira", "Menallack Farmhouse","Menonita", "Meredith Blue", "Mesost", "Metton (Cancoillotte)","Meyer Vintage Gouda", "Mihalic Peynir", "Milleens", "Mimolette","Mine-Gabhar", "Mini Baby Bells", "Mixte", "Molbo","Monastery Cheeses", "Mondseer", "Mont D'or Lyonnais", "Montasio","Monterey Jack", "Monterey Jack Dry", "Morbier","Morbier Cru de Montagne", "Mothais a la Feuille", "Mozzarella","Mozzarella (Australian)", "Mozzarella di Bufala","Mozzarella Fresh, in water", "Mozzarella Rolls", "Munster","Murol", "Mycella", "Myzithra", "Naboulsi", "Nantais","Neufchatel", "Neufchatel (Australian)", "Niolo", "Nokkelost","Northumberland", "Oaxaca", "Olde York", "Olivet au Foin","Olivet Bleu", "Olivet Cendre", "Orkney Extra Mature Cheddar","Orla", "Oschtjepka", "Ossau Fermier", "Ossau-Iraty", "Oszczypek","Oxford Blue", "P'tit Berrichon", "Palet de Babligny", "Paneer","Panela", "Pannerone", "Pant ys Gawn", "Parmesan (Parmigiano)","Parmigiano Reggiano", "Pas de l'Escalette", "Passendale","Pasteurized Processed", "Pate de Fromage", "Patefine Fort","Pave d'Affinois", "Pave d'Auge", "Pave de Chirac","Pave du Berry", "Pecorino", "Pecorino in Walnut Leaves","Pecorino Romano", "Peekskill Pyramid", "Pelardon des Cevennes","Pelardon des Corbieres", "Penamellera", "Penbryn", "Pencarreg","Perail de Brebis", "Petit Morin", "Petit Pardou", "Petit-Suisse","Picodon de Chevre", "Picos de Europa", "Piora","Pithtviers au Foin", "Plateau de Herve", "Plymouth Cheese","Podhalanski", "Poivre d'Ane", "Polkolbin", "Pont l'Eveque","Port Nicholson", "Port-Salut", "Postel", "Pouligny-Saint-Pierre","Pourly", "Prastost", "Pressato", "Prince-Jean","Processed Cheddar", "Provolone", "Provolone (Australian)","Pyengana Cheddar", "Pyramide", "Quark", "Quark (Australian)","Quartirolo Lombardo", "Quatre-Vents", "Quercy Petit","Queso Blanco", "Queso Blanco con Frutas --Pina y Mango","Queso de Murcia", "Queso del Montsec", "Queso del Tietar","Queso Fresco", "Queso Fresco (Adobera)", "Queso Iberico","Queso Jalapeno", "Queso Majorero", "Queso Media Luna","Queso Para Frier", "Queso Quesadilla", "Rabacal", "Raclette","Ragusano", "Raschera", "Reblochon", "Red Leicester","Regal de la Dombes", "Reggianito", "Remedou", "Requeson","Richelieu", "Ricotta", "Ricotta (Australian)", "Ricotta Salata","Ridder", "Rigotte", "Rocamadour", "Rollot", "Romano","Romans Part Dieu", "Roncal", "Roquefort", "Roule","Rouleau De Beaulieu", "Royalp Tilsit", "Rubens", "Rustinu","Saaland Pfarr", "Saanenkaese", "Saga", "Sage Derby","Sainte Maure", "Saint-Marcellin", "Saint-Nectaire","Saint-Paulin", "Salers", "Samso", "San Simon", "Sancerre","Sap Sago", "Sardo", "Sardo Egyptian", "Sbrinz", "Scamorza","Schabzieger", "Schloss", "Selles sur Cher", "Selva", "Serat","Seriously Strong Cheddar", "Serra da Estrela", "Sharpam","Shelburne Cheddar", "Shropshire Blue", "Siraz", "Sirene","Smoked Gouda", "Somerset Brie", "Sonoma Jack","Sottocenare al Tartufo", "Soumaintrain", "Sourire Lozerien","Spenwood", "Sraffordshire Organic", "St. Agur Blue Cheese","Stilton", "Stinking Bishop", "String", "Sussex Slipcote","Sveciaost", "Swaledale", "Sweet Style Swiss", "Swiss","Syrian (Armenian String)", "Tala", "Taleggio", "Tamie","Tasmania Highland Chevre Log", "Taupiniere", "Teifi", "Telemea","Testouri", "Tete de Moine", "Tetilla", "Texas Goat Cheese","Tibet", "Tillamook Cheddar", "Tilsit", "Timboon Brie", "Toma","Tomme Brulee", "Tomme d'Abondance", "Tomme de Chevre","Tomme de Romans", "Tomme de Savoie", "Tomme des Chouans","Tommes", "Torta del Casar", "Toscanello", "Touree de L'Aubier","Tourmalet", "Trappe (Veritable)", "Trois Cornes De Vendee","Tronchon", "Trou du Cru", "Truffe", "Tupi", "Turunmaa","Tymsboro", "Tyn Grug", "Tyning", "Ubriaco", "Ulloa","Vacherin-Fribourgeois", "Valencay", "Vasterbottenost", "Venaco","Vendomois", "Vieux Corse", "Vignotte", "Vulscombe","Waimata Farmhouse Blue", "Washed Rind Cheese (Australian)","Waterloo", "Weichkaese", "Wellington", "Wensleydale","White Stilton", "Whitestone Farmhouse", "Wigmore","Woodside Cabecou", "Xanadu", "Xynotyro", "Yarg Cornish","Yarra Valley Pyramid", "Yorkshire Blue", "Zamorano","Zanetti Grana Padano", "Zanetti Parmigiano Reggiano" };private TextView overlay;/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);this.overlay = (TextView) View.inflate(this, R.layout.overlay, null);getWindowManager().addView(overlay,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));ListView listView = (ListView) findViewById(R.id.listView);listView.setAdapter(new BaseAdapter() {@Overridepublic View getView(int position, View convertView, ViewGroup parent) {TextView textView = new TextView(ListViewActivity.this);textView.setText(items[position]);return textView;}@Overridepublic long getItemId(int position) {return position;}@Overridepublic Object getItem(int position) {return items[position];}@Overridepublic int getCount() {return items.length;}});listView.setOnScrollListener(new OnScrollListener() {boolean visible;@Overridepublic void onScrollStateChanged(AbsListView view, int scrollState) {visible = true;if (scrollState == ListView.OnScrollListener.SCROLL_STATE_IDLE) {overlay.setVisibility(View.INVISIBLE);}}@Overridepublic void onScroll(AbsListView view, int firstVisibleItem,int visibleItemCount, int totalItemCount) {if (visible) {overlay.setText(items[firstVisibleItem].substring(0, 1));overlay.setVisibility(View.VISIBLE);}}});try {Field f = AbsListView.class.getDeclaredField("mFastScroller");f.setAccessible(true);Object o = f.get(listView);f = f.getType().getDeclaredField("mThumbDrawable");f.setAccessible(true);Drawable drawable = (Drawable) f.get(o);drawable = getResources().getDrawable(R.drawable.icon);f.set(o, drawable);Toast.makeText(this, f.getType().getName(), 1000).show();} catch (Exception e) {throw new RuntimeException(e);}}}

备注一：

设置快速滚动属性很容易，只需在布局的xml文件里设置属性即可：

<?xml version="1.0" encoding="utf-8"?><LinearLayout 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/listView" android:layout_width="fill_parent"android:layout_height="fill_parent" android:fastScrollEnabled="true"android:focusable="true" /></LinearLayout>

备注二：设置自定义滑动图片

通篇查看了ListView及其超累AbsListView，都未找到自定义图片的设置接口。看来是没打算让开发者更改了。但是用户要求我们自定义这个图片。那只能用非常手段了。

经过分析发现，该图片是ListView超类AbsListView的一个成员mFastScroller对象的成员mThumbDrawable。这里mThumbDrawable是Drawable类型的。mFastScroller是FastScroller类型，这个类型比较麻烦，类的声明没有modifier，也就是default（package），只能供包内的类调用。

因此反射代码写的稍微麻烦一些：

try {Field f = AbsListView.class.getDeclaredField("mFastScroller");//Get mFastScroller field idf.setAccessible(true);Object o = f.get(listView);//Get listview objectf = f.getType().getDeclaredField("mThumbDrawable");//Get mThumbDrawable field idf.setAccessible(true);Drawable drawable = (Drawable) f.get(o);//Get mThrmbDrawable of listview by iddrawable = getResources().getDrawable(R.drawable.icon);f.set(o, drawable);Toast.makeText(this, f.getType().getName(), 1000).show();} catch (Exception e) {throw new RuntimeException(e);}

备注三：如何实现首字符显示

刚开始的时候一直以为是右面按钮的拖动一下跳到一个字母序列呢，后来发现不是，右面的快速拖动和字母的现实没有关系，只是快速拖动而已，现实的字符只是显示当前listview能看到的firstVisibleItem的第一个字母的值，并没有实现什么算法之类的东西

@Overridepublic void onScroll(AbsListView view, int firstVisibleItem,int visibleItemCount, int totalItemCount) {if (visible) {overlay.setText(items[firstVisibleItem].substring(0, 1));overlay.setVisibility(View.VISIBLE);}}