Android Open Source - 2014-Droid-code Main Activity

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License

The source code is released under:

GNU General Public License

Java Source Code

package cs534.samples.simplestlv;
/*from   www.ja  v  a 2 s . c om*/
import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;

/*
 * Example 1 for ListView
 * ListView is an AbsListView, AbsListView is an AdapterView,  AdapterView is a ViewGroup, ViewGroup is a View
 * 
 * Simplest example of a ListView, populated by an array from resources res/values/strings.xml
 * the ListView responds to item click events.
 * 
 * (commented code to populate  from an inline static array.)
 */
public class MainActivity extends Activity {
  private ListView lv;
  private final String TAG = "SIMPLELV";
  ArrayAdapter<String> aa, aal=null;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    /*
     * setContentView(): inflate the main layout (UI) from activity_main.xml
     * inflation: xml -> ojbect(s)
     */
    setContentView(R.layout.activity_main);

    // the objects are now created, get a reference to the listview object
    lv = (ListView) findViewById(R.id.list);

    // use the strings.xml array
    String countries[] = getResources().getStringArray(
        R.array.countries_array);
    /* If I were going to manipulate this array I would use a List
     * but since I am not I save a step
    List<String> countriesList = new ArrayList<String>(Arrays.asList(countries));
     */

    /*
     * ListView, GridView, GalleryView containers are types of ArrayAdapter
     * controls ArrayAdapter is a BaseAdapter, Adapters bind data to View
     * objects
     * 
     * the layout xml is defined in res/layout/list_item.xml (template for
     * filling each row) (used when instantiating views) 
     * 
     * the data in this case is a String array that was originally defined
     * in xml
     */

    aa = new ArrayAdapter<String>(this,
        R.layout.list_item, countries);
    /*
     * setAdapter() sets the data & layout behind the ListView
     */
    lv.setAdapter(aa);


    /*
     * Once the adapter is assigned you may want an item click to be an
     * event that it responded to so you must set up a listener for the
     * ListView
     */
    lv.setOnItemClickListener(new OnItemClickListener() {
      public void onItemClick(AdapterView<?> parent, View view,
          int position, long id) {
        // When clicked, show a toast with the current TextView text
        Toast.makeText(getApplicationContext(),
            ((TextView) view).getText(), Toast.LENGTH_SHORT).show();
        Log.d(TAG, (String) ((TextView) view).getText());
      }
    });

  }

  public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
  }
  // you may swap to  the COUNTRIES array defined below it is a bigger array
  // than countries_array

  public boolean onOptionsItemSelected(MenuItem item)
  {

    switch (item.getItemId())
    {
    case R.id.swap:
      if (lv.getAdapter() == aa ) {
        if (aal == null) {
          aal = new ArrayAdapter<String>(this, R.layout.list_item,
              COUNTRIES);
        } 
        lv.setAdapter(aal);
      } else
        lv.setAdapter(aa);
      return true;
    default:
      return false;
    }
  }
  static final String[] COUNTRIES = new String[] { "Afghanistan", "Albania",
    "Algeria", "American Samoa", "Andorra", "Angola", "Anguilla",
    "Antarctica", "Antigua and Barbuda", "Argentina", "Armenia",
    "Aruba", "Australia", "Austria", "Azerbaijan", "Bahrain",
    "Bangladesh", "Barbados", "Belarus", "Belgium", "Belize", "Benin",
    "Bermuda", "Bhutan", "Bolivia", "Bosnia and Herzegovina",
    "Botswana", "Bouvet Island", "Brazil",
    "British Indian Ocean Territory", "British Virgin Islands",
    "Brunei", "Bulgaria", "Burkina Faso", "Burundi", "Cote d'Ivoire",
    "Cambodia", "Cameroon", "Canada", "Cape Verde", "Cayman Islands",
    "Central African Republic", "Chad", "Chile", "China",
    "Christmas Island", "Cocos (Keeling) Islands", "Colombia",
    "Comoros", "Congo", "Cook Islands", "Costa Rica", "Croatia",
    "Cuba", "Cyprus", "Czech Republic",
    "Democratic Republic of the Congo", "Denmark", "Djibouti",
    "Dominica", "Dominican Republic", "East Timor", "Ecuador", "Egypt",
    "El Salvador", "Equatorial Guinea", "Eritrea", "Estonia",
    "Ethiopia", "Faeroe Islands", "Falkland Islands", "Fiji",
    "Finland", "Former Yugoslav Republic of Macedonia", "France",
    "French Guiana", "French Polynesia", "French Southern Territories",
    "Gabon", "Georgia", "Germany", "Ghana", "Gibraltar", "Greece",
    "Greenland", "Grenada", "Guadeloupe", "Guam", "Guatemala",
    "Guinea", "Guinea-Bissau", "Guyana", "Haiti",
    "Heard Island and McDonald Islands", "Honduras", "Hong Kong",
    "Hungary", "Iceland", "India", "Indonesia", "Iran", "Iraq",
    "Ireland", "Israel", "Italy", "Jamaica", "Japan", "Jordan",
    "Kazakhstan", "Kenya", "Kiribati", "Kuwait", "Kyrgyzstan", "Laos",
    "Latvia", "Lebanon", "Lesotho", "Liberia", "Libya",
    "Liechtenstein", "Lithuania", "Luxembourg", "Macau", "Madagascar",
    "Malawi", "Malaysia", "Maldives", "Mali", "Malta",
    "Marshall Islands", "Martinique", "Mauritania", "Mauritius",
    "Mayotte", "Mexico", "Micronesia", "Moldova", "Monaco", "Mongolia",
    "Montserrat", "Morocco", "Mozambique", "Myanmar", "Namibia",
    "Nauru", "Nepal", "Netherlands", "Netherlands Antilles",
    "New Caledonia", "New Zealand", "Nicaragua", "Niger", "Nigeria",
    "Niue", "Norfolk Island", "North Korea", "Northern Marianas",
    "Norway", "Oman", "Pakistan", "Palau", "Panama",
    "Papua New Guinea", "Paraguay", "Peru", "Philippines",
    "Pitcairn Islands", "Poland", "Portugal", "Puerto Rico", "Qatar",
    "Reunion", "Romania", "Russia", "Rwanda", "Sqo Tome and Principe",
    "Saint Helena", "Saint Kitts and Nevis", "Saint Lucia",
    "Saint Pierre and Miquelon", "Saint Vincent and the Grenadines",
    "Samoa", "San Marino", "Saudi Arabia", "Senegal", "Seychelles",
    "Sierra Leone", "Singapore", "Slovakia", "Slovenia",
    "Solomon Islands", "Somalia", "South Africa",
    "South Georgia and the South Sandwich Islands", "South Korea",
    "Spain", "Sri Lanka", "Sudan", "Suriname",
    "Svalbard and Jan Mayen", "Swaziland", "Sweden", "Switzerland",
    "Syria", "Taiwan", "Tajikistan", "Tanzania", "Thailand",
    "The Bahamas", "The Gambia", "Togo", "Tokelau", "Tonga",
    "Trinidad and Tobago", "Tunisia", "Turkey", "Turkmenistan",
    "Turks and Caicos Islands", "Tuvalu", "Virgin Islands", "Uganda",
    "Ukraine", "United Arab Emirates", "United Kingdom",
    "United States", "United States Minor Outlying Islands", "Uruguay",
    "Uzbekistan", "Vanuatu", "Vatican City", "Venezuela", "Vietnam",
    "Wallis and Futuna", "Western Sahara", "Yemen", "Yugoslavia",
    "Zambia", "Zimbabwe" };
}

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