Android Open Source - android-tutorials-custom-selectable-listview Main Activity

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License

The source code is released under:

Apache License

Java Source Code

package fr.marvinlabs.selectablelisttutorial;
//from ww w.jav  a2  s. co  m
import java.util.ArrayList;
import java.util.List;

import android.app.ListActivity;
import android.os.Bundle;
import android.util.SparseBooleanArray;
import android.view.View;
import android.widget.ListView;
import android.widget.Toast;
import fr.marvinlabs.selectablelisttutorial.pojo.Item;

/**
 * Our main activity, show a list of items and allows to select some of them
 * 
 * @author marvinlabs
 */
public class MainActivity extends ListActivity {

  private List<Item> data;
  private ListView listView;
  private ItemListAdapter adapter;

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    // Create some sample data and sort it alphabetically
    // --
    data = new ArrayList<Item>(30);
    data.add(new Item(10, "France"));
    data.add(new Item(11, "United Kingdom"));
    data.add(new Item(12, "Ireland"));
    data.add(new Item(13, "Germany"));
    data.add(new Item(14, "Belgium"));
    data.add(new Item(15, "Luxembourg"));
    data.add(new Item(16, "Netherlands"));
    data.add(new Item(17, "Italy"));
    data.add(new Item(18, "Denmark"));
    data.add(new Item(19, "Spain"));

    data.add(new Item(20, "France"));
    data.add(new Item(21, "United Kingdom"));
    data.add(new Item(22, "Ireland"));
    data.add(new Item(23, "Germany"));
    data.add(new Item(24, "Belgium"));
    data.add(new Item(25, "Luxembourg"));
    data.add(new Item(26, "Netherlands"));
    data.add(new Item(27, "Italy"));
    data.add(new Item(28, "Denmark"));
    data.add(new Item(29, "Spain"));

    data.add(new Item(30, "France"));
    data.add(new Item(31, "United Kingdom"));
    data.add(new Item(32, "Ireland"));
    data.add(new Item(33, "Germany"));
    data.add(new Item(34, "Belgium"));
    data.add(new Item(35, "Luxembourg"));
    data.add(new Item(36, "Netherlands"));
    data.add(new Item(37, "Italy"));
    data.add(new Item(38, "Denmark"));
    data.add(new Item(39, "Spain"));

    // Create the adapter to render our data
    // --
    adapter = new ItemListAdapter(this, data);
    setListAdapter(adapter);

    // Get some views for later use
    // --
    listView = getListView();
    listView.setItemsCanFocus(false);
  }

  /**
   * Called when the user presses one of the buttons in the main view
   */
  public void onButtonClick(View v) {
    switch (v.getId()) {
      case R.id.viewCheckedIdsButton:
        showSelectedItemIds();
        break;
      case R.id.viewCheckedItemsButton:
        showSelectedItems();
        break;
      case R.id.toggleChoiceModeButton:
        toggleChoiceMode();
        break;
    }
  }

  /**
   * Change the list selection mode
   */
  private void toggleChoiceMode() {
    clearSelection();

    final int currentMode = listView.getChoiceMode();
    switch (currentMode) {
      case ListView.CHOICE_MODE_NONE:
        listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
        Toast.makeText(this, "List choice mode: SINGLE", Toast.LENGTH_SHORT).show();
        break;
      case ListView.CHOICE_MODE_SINGLE:
        listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
        Toast.makeText(this, "List choice mode: MULTIPLE", Toast.LENGTH_SHORT).show();
        break;
      case ListView.CHOICE_MODE_MULTIPLE:
        listView.setChoiceMode(ListView.CHOICE_MODE_NONE);
        Toast.makeText(this, "List choice mode: NONE", Toast.LENGTH_SHORT).show();
        break;
    }
  }

  /**
   * Show a message giving the selected item captions
   */
  private void showSelectedItems() {
    final StringBuffer sb = new StringBuffer("Selection: ");

    // Get an array that tells us for each position whether the item is
    // checked or not
    // --
    final SparseBooleanArray checkedItems = listView.getCheckedItemPositions();
    if (checkedItems == null) {
      Toast.makeText(this, "No selection info available", Toast.LENGTH_LONG).show();
      return;
    }

    // For each element in the status array
    // --
    boolean isFirstSelected = true;
    final int checkedItemsCount = checkedItems.size();
    for (int i = 0; i < checkedItemsCount; ++i) {
      // This tells us the item position we are looking at
      // --
      final int position = checkedItems.keyAt(i);

      // This tells us the item status at the above position
      // --
      final boolean isChecked = checkedItems.valueAt(i);

      if (isChecked) {
        if (!isFirstSelected) {
          sb.append(", ");
        }
        sb.append(data.get(position).getCaption());
        isFirstSelected = false;
      }
    }

    // Show a message with the countries that are selected
    // --
    Toast.makeText(this, sb.toString(), Toast.LENGTH_LONG).show();
  }

  /**
   * Show a message giving the selected item IDs. There seems to be a bug with ListView#getCheckItemIds() on Android
   * 1.6 at least @see http://code.google.com/p/android/issues/detail?id=6609
   */
  private void showSelectedItemIds() {
    final StringBuffer sb = new StringBuffer("Selection: ");

    // Get an array that contains the IDs of the list items that are checked
    // --
    final long[] checkedItemIds = listView.getCheckItemIds();
    if (checkedItemIds == null) {
      Toast.makeText(this, "No selection", Toast.LENGTH_LONG).show();
      return;
    }

    // For each ID in the status array
    // --
    boolean isFirstSelected = true;
    final int checkedItemsCount = checkedItemIds.length;
    for (int i = 0; i < checkedItemsCount; ++i) {
      if (!isFirstSelected) {
        sb.append(", ");
      }
      sb.append(checkedItemIds[i]);
      isFirstSelected = false;
    }

    // Show a message with the country IDs that are selected
    // --
    Toast.makeText(this, sb.toString(), Toast.LENGTH_LONG).show();
  }

  /**
   * Uncheck all the items
   */
  private void clearSelection() {
    final int itemCount = listView.getCount();
    for (int i = 0; i < itemCount; ++i) {
      listView.setItemChecked(i, false);
    }
  }
}

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