发布于 2017-09-12 13:05:16 | 16 次阅读 | 评论: 0 | 来源: 网友投递

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Android移动端操作系统

Android是一种基于Linux的自由及开放源代码的操作系统,主要使用于移动设备,如智能手机和平板电脑,由Google公司和开放手机联盟领导及开发。尚未有统一中文名称,中国大陆地区较多人使用“安卓”或“安致”。


这篇文章主要介绍了Android ListView实现单选及多选等功能的方法,结合实例形式分析了ListView单选、多选及长按多选等功能相关实现技巧,需要的朋友可以参考下

本文实例讲述了Android ListView实现单选及多选等功能的方法。分享给大家供大家参考,具体如下:

在项目中也遇到过给ListView的item添加选择功能。比如一个网购APP,有个历史浏览页面,这个页面现点击item单选/多选及全选删除功能。

当时也是通过在数据中添加一个是否选择的字段来记录item的状态,然后根据这个字段有相应的position位置进行选择状态更改及删除操作。

刚刚看了Android API Demos中17种ListView的实现方法,发现ListView自身就带有我们所需要的单选,多选功能而且实现起来相当方便。


/**
 * 单选或多选功能ListView
 * @description:
 * @author ldm
 * @date 2016-4-21 上午10:44:37
 */
public class SingleChoiceList extends ListActivity {
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setListAdapter(new ArrayAdapter<String>(this,
        android.R.layout.simple_list_item_single_choice, GENRES));
    final ListView listView = getListView();
    listView.setItemsCanFocus(false);
    listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);//添加这一句话,就实现单选功能
      //listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);//添加这一句话,就实现多选功能
  }
  private static final String[] GENRES = new String[] {
    "Action", "Adventure", "Animation", "Children", "Comedy", "Documentary", "Drama",
    "Foreign", "History", "Independent", "Romance", "Sci-Fi", "Television", "Thriller"
  };
}


/**
 * 长按多选,添加了选择模式
 * @description:
 * @author ldm
 * @date 2016-4-21 上午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<String>(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;
}

当我们通过以上这些方法实现ListView选中之后,我们可以把对应的item位置记录下来,就可以对相应地数据进行操作了


/**
 * 带悬浮提示框的ListView
 *
 * @description:
 * @author ldm
 * @date 2016-4-21 上午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<String>(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" };
}

希望本文所述对大家Android程序设计有所帮助。



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