Android ListViewによるラジオやマルチ選択などの機能例
16939 ワード
この例では、Android ListViewがラジオやマルチ選択などの機能を実現する方法について説明します.皆さんの参考にしてください.具体的には以下の通りです.
プロジェクトでもListViewのitemに選択機能を追加したことがある.例えば、ネット通販アプリには、履歴閲覧ページがあり、このページではitemラジオ/マルチ選択および全選択削除機能をクリックします.
当時もデータに選択するかどうかのフィールドを追加することでitemの状態を記録し、このフィールドに対応するposition位置があることに基づいて選択状態の変更および削除操作を行った.
Android API Demosの17種類のListViewの実装方法を見たところ、ListView自体には私たちが必要とするラジオがあり、複数選択機能があり、非常に便利であることがわかりました.
これらの方法でListView選択を実現すると,対応するitem位置を記録することができ,対応するデータを操作することができる.
Androidに関する詳細に興味のある方は、「Androidコントロールの使い方のまとめ」、「Android開発入門と進級チュートリアル」、「AndroidビューViewテクニックのまとめ」、「Androidプログラミングのactivity操作テクニックのまとめ」、「Androidデータライブラリ操作テクニックのまとめ」、「Androidリソース操作テクニックのまとめ」を参照してください.
この文書がAndroidプログラムの設計に役立つことを願っています.
プロジェクトでもListViewのitemに選択機能を追加したことがある.例えば、ネット通販アプリには、履歴閲覧ページがあり、このページではitemラジオ/マルチ選択および全選択削除機能をクリックします.
当時もデータに選択するかどうかのフィールドを追加することでitemの状態を記録し、このフィールドに対応するposition位置があることに基づいて選択状態の変更および削除操作を行った.
Android API Demosの17種類のListViewの実装方法を見たところ、ListView自体には私たちが必要とするラジオがあり、複数選択機能があり、非常に便利であることがわかりました.
/**
* ListView
* @description：
* @author ldm
* @date 2016-4-21 10:44:37
*/
public class SingleChoiceList extends ListActivity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setListAdapter(new ArrayAdapter(this,
android.R.layout.simple_list_item_single_choice, GENRES));
final ListView listView = getListView();
listView.setItemsCanFocus(false);
listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);// ，
//listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);// ，
}
private static final String[] GENRES = new String[] {
"Action", "Adventure", "Animation", "Children", "Comedy", "Documentary", "Drama",
"Foreign", "History", "Independent", "Romance", "Sci-Fi", "Television", "Thriller"
};
}
/**
* ，
* @description：
* @author ldm
* @date 2016-4-21 10:47:55
*/
public class ChoiceModeList extends ListActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ListView lv = getListView();
lv.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE_MODAL);
lv.setMultiChoiceModeListener(new ModeCallback());
setListAdapter(new ArrayAdapter(this,
android.R.layout.simple_list_item_checked, mStrings));
}
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
getActionBar().setSubtitle("Long press to start selection");
}
private class ModeCallback implements ListView.MultiChoiceModeListener {
public boolean onCreateActionMode(ActionMode mode, Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.list_select_menu, menu);
mode.setTitle("Select Items");
setSubtitle(mode);
return true;
}
public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
return true;
}
public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
switch (item.getItemId()) {
case R.id.share:
Toast.makeText(ChoiceModeList.this, "Shared " + getListView().getCheckedItemCount() +
" items", Toast.LENGTH_SHORT).show();
mode.finish();
break;
default:
Toast.makeText(ChoiceModeList.this, "Clicked " + item.getTitle(),
Toast.LENGTH_SHORT).show();
break;
}
return true;
}
public void onDestroyActionMode(ActionMode mode) {
}
public void onItemCheckedStateChanged(ActionMode mode,
int position, long id, boolean checked) {
setSubtitle(mode);
}
private void setSubtitle(ActionMode mode) {
final int checkedCount = getListView().getCheckedItemCount();
switch (checkedCount) {
case 0:
mode.setSubtitle(null);
break;
case 1:
mode.setSubtitle("One item selected");
break;
default:
mode.setSubtitle("" + checkedCount + " items selected");
break;
}
}
}
private String[] mStrings = Cheeses.sCheeseStrings;
}
これらの方法でListView選択を実現すると,対応するitem位置を記録することができ,対応するデータを操作することができる.
/**
* ListView
*
* @description：
* @author ldm
* @date 2016-4-21 10:55:51
*/
public class List9 extends ListActivity implements ListView.OnScrollListener {
private final class RemoveWindow implements Runnable {
public void run() {
removeWindow();
}
}
private RemoveWindow mRemoveWindow = new RemoveWindow();
Handler mHandler = new Handler();
private WindowManager mWindowManager;
private TextView mDialogText;
private boolean mShowing;
private boolean mReady;
private char mPrevLetter = Character.MIN_VALUE;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mWindowManager = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
setListAdapter(new ArrayAdapter(this,
android.R.layout.simple_list_item_1, mStrings));
getListView().setOnScrollListener(this);
LayoutInflater inflate = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
mDialogText = (TextView) inflate.inflate(R.layout.list_position, null);
mDialogText.setVisibility(View.INVISIBLE);
mHandler.post(new Runnable() {
public void run() {
mReady = true;
WindowManager.LayoutParams lp = new WindowManager.LayoutParams(
LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT,
WindowManager.LayoutParams.TYPE_APPLICATION,
WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE
| WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
PixelFormat.TRANSLUCENT);
mWindowManager.addView(mDialogText, lp);
}
});
}
@Override
protected void onResume() {
super.onResume();
mReady = true;
}
@Override
protected void onPause() {
super.onPause();
removeWindow();
mReady = false;
}
@Override
protected void onDestroy() {
super.onDestroy();
mWindowManager.removeView(mDialogText);
mReady = false;
}
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
if (mReady) {
char firstLetter = mStrings[firstVisibleItem].charAt(0);
if (!mShowing && firstLetter != mPrevLetter) {
mShowing = true;
mDialogText.setVisibility(View.VISIBLE);
}
mDialogText.setText(((Character) firstLetter).toString());
mHandler.removeCallbacks(mRemoveWindow);
mHandler.postDelayed(mRemoveWindow, 3000);
mPrevLetter = firstLetter;
}
}
public void onScrollStateChanged(AbsListView view, int scrollState) {
}
private void removeWindow() {
if (mShowing) {
mShowing = false;
mDialogText.setVisibility(View.INVISIBLE);
}
}
private String[] mStrings = new String[] { "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",
"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", "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", "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", "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", "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", "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", "Venaco", "Vendomois",
"Vieux Corse", "Vignotte", "Vulscombe", "Waimata Farmhouse Blue",
"Washed Rind Cheese (Australian)", "Waterloo", "Weichkaese",
"Wellington", "Wensleydale", "White Stilton",
"Zanetti Parmigiano Reggiano" };
}
Androidに関する詳細に興味のある方は、「Androidコントロールの使い方のまとめ」、「Android開発入門と進級チュートリアル」、「AndroidビューViewテクニックのまとめ」、「Androidプログラミングのactivity操作テクニックのまとめ」、「Androidデータライブラリ操作テクニックのまとめ」、「Androidリソース操作テクニックのまとめ」を参照してください.
この文書がAndroidプログラムの設計に役立つことを願っています.