Android Open Source - irma_android_verifier Settings Activity

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Back to project page irma_android_verifier.

License

The source code is released under:

GNU General Public License

Java Source Code

package org.irmacard.androidverifier;
/*from   w  w w . jav  a  2 s.c  o m*/
import java.util.Collection;
import java.util.List;

import org.irmacard.credentials.info.DescriptionStore;
import org.irmacard.credentials.info.InfoException;
import org.irmacard.credentials.info.IssuerDescription;
import org.irmacard.credentials.info.VerificationDescription;

import android.annotation.TargetApi;
import android.content.Context;
import android.content.res.Configuration;
import android.os.Build;
import android.os.Bundle;
import android.preference.ListPreference;
import android.preference.Preference;
import android.preference.PreferenceActivity;
import android.preference.PreferenceCategory;
import android.preference.PreferenceFragment;
import android.preference.PreferenceManager;
import android.support.v4.app.NavUtils;
import android.view.MenuItem;

/**
 * A {@link PreferenceActivity} that presents a set of application settings. On
 * handset devices, settings are presented as a single list. On tablets,
 * settings are split by category, with category headers shown to the left of
 * the list of settings.
 * <p>
 * See <a href="http://developer.android.com/design/patterns/settings.html">
 * Android Design: Settings</a> for design guidelines and the <a
 * href="http://developer.android.com/guide/topics/ui/settings.html">Settings
 * API Guide</a> for more information on developing a Settings UI.
 */
public class SettingsActivity extends PreferenceActivity {
  public static final String KEY_PREF_LANGUAGE = "language_list";
  public static final String KEY_PREF_VERIFIER = "verifier_list";
  public static final String KEY_PREF_VERIFICATIONDESCRIPTION = "verificationspec_list";
  /**
   * Determines whether to always show the simplified settings UI, where
   * settings are presented in a single list. When false, settings are shown
   * as a master/detail two-pane view on tablets. When true, a single pane is
   * shown on tablets.
   */
  private static final boolean ALWAYS_SIMPLE_PREFS = false;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setupActionBar();
  }

  /**
   * Set up the {@link android.app.ActionBar}, if the API is available.
   */
  @TargetApi(Build.VERSION_CODES.HONEYCOMB)
  private void setupActionBar() {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
      // Show the Up button in the action bar.
      getActionBar().setDisplayHomeAsUpEnabled(true);
    }
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
    case android.R.id.home:
      // This ID represents the Home or Up button. In the case of this
      // activity, the Up button is shown. Use NavUtils to allow users
      // to navigate up one level in the application structure. For
      // more details, see the Navigation pattern on Android Design:
      //
      // http://developer.android.com/design/patterns/navigation.html#up-vs-back
      //
      // TODO: If Settings has multiple levels, Up should navigate up
      // that hierarchy.
      NavUtils.navigateUpFromSameTask(this);
      return true;
    }
    return super.onOptionsItemSelected(item);
  }

  @Override
  protected void onPostCreate(Bundle savedInstanceState) {
    super.onPostCreate(savedInstanceState);

    setupSimplePreferencesScreen();
  }

  /**
   * Shows the simplified settings UI if the device configuration if the
   * device configuration dictates that a simplified, single-pane UI should be
   * shown.
   */
  private void setupSimplePreferencesScreen() {
    if (!isSimplePreferences(this)) {
      return;
    }

    // In the simplified UI, fragments are not used at all and we instead
    // use the older PreferenceActivity APIs.

    // Add 'general' preferences.
    addPreferencesFromResource(R.xml.pref_general);

    // Add 'verifier' preferences, and a corresponding header.
    PreferenceCategory fakeHeader = new PreferenceCategory(this);
    fakeHeader.setTitle(R.string.pref_header_verifier);
    getPreferenceScreen().addPreference(fakeHeader);
    addPreferencesFromResource(R.xml.pref_verifier);
    
    final ListPreference verifierlist = (ListPreference)findPreference(KEY_PREF_VERIFIER);
    
    fillVerifierList(verifierlist, PreferenceManager.getDefaultSharedPreferences(
        verifierlist.getContext()).getString(verifierlist.getKey(),
        ""));
    String selectedVerifier = verifierlist.getValue();

    
    final ListPreference verificationspeclist = (ListPreference)findPreference(KEY_PREF_VERIFICATIONDESCRIPTION);
    
    String selectedDescription = PreferenceManager.getDefaultSharedPreferences(
        verificationspeclist.getContext()).getString(verificationspeclist.getKey(),
        "");
    fillVerificationDescriptionsList(verificationspeclist, selectedVerifier, selectedDescription);

    
    // This setting needs a custom change listener:
    // If the verifierlist changes, then we verificationspec list also needs to change
    
    verifierlist.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
      @Override
      public boolean onPreferenceChange(Preference preference, Object newValue) {
        sBindPreferenceSummaryToValueListener.onPreferenceChange(preference, newValue);
        
        String selectedVerifier = newValue.toString();
        fillVerificationDescriptionsList(verificationspeclist, selectedVerifier, "");
        
        return true;
      }
    });

    // Bind the summaries the preferences to their values. When their values change, 
    // their summaries are updated to reflect the new value, per the Android Design 
    // guidelines.
    bindPreferenceSummaryToValue(findPreference(KEY_PREF_VERIFICATIONDESCRIPTION));
    bindPreferenceSummaryToValue(findPreference(KEY_PREF_LANGUAGE));
  }

  private void fillVerifierList(ListPreference listpref, String selectedVerifier) {
    DescriptionStore ds = null;
    try {
       ds = DescriptionStore.getInstance();
    } catch (InfoException e) {
      e.printStackTrace();
    }
    Collection<IssuerDescription> issuers = ds.getIssuerDescriptions();
    
    String[] verifierIDs = new String[issuers.size()];
    String[] verifierNames = new String[issuers.size()];
    
    int selectedIndex = 0;
    int i=0;
    for (IssuerDescription issuerDescription : issuers) {
      verifierIDs[i] = issuerDescription.getID();
      verifierNames[i] = issuerDescription.getName();
      if (verifierIDs[i].equals(selectedVerifier)) {
        selectedIndex = i;
      }
      i += 1;
    }
    
    listpref.setEntries(verifierNames);
    listpref.setEntryValues(verifierIDs);
    listpref.setValueIndex(selectedIndex);
    listpref.setValue(verifierIDs[selectedIndex]);
    listpref.setSummary(verifierNames[selectedIndex]);
    
  }
  
  private void fillVerificationDescriptionsList(ListPreference listpref, String verifierID, String selectedDescription) {
    DescriptionStore ds = null;
    try {
       ds = DescriptionStore.getInstance();
    } catch (InfoException e) {
      e.printStackTrace();
    }
    Collection<VerificationDescription> verificationDescriptions = ds.getVerificationDescriptionsForVerifier(verifierID);
    String[] verificationDescriptionIDs = new String[verificationDescriptions.size()];
    String[] verificationDescriptionNames = new String[verificationDescriptions.size()];
    
    int selectedIndex = 0;
    int i = 0;
    for (VerificationDescription verificationDescription : verificationDescriptions) {
      verificationDescriptionIDs[i] = verificationDescription.getVerificationID();
      verificationDescriptionNames[i] = verificationDescription.getName();
      if (verificationDescriptionIDs[i].equals(selectedDescription)) {
        selectedIndex = i;
      }
      i += 1;
    }

    listpref.setEntries(verificationDescriptionNames);
    listpref.setEntryValues(verificationDescriptionIDs);
    listpref.setValueIndex(selectedIndex);
    listpref.setSummary(verificationDescriptionNames[selectedIndex]);
    listpref.setValue(verificationDescriptionIDs[selectedIndex]);

  }
  
  /** {@inheritDoc} */
  @Override
  public boolean onIsMultiPane() {
    return isXLargeTablet(this) && !isSimplePreferences(this);
  }

  /**
   * Helper method to determine if the device has an extra-large screen. For
   * example, 10" tablets are extra-large.
   */
  private static boolean isXLargeTablet(Context context) {
    return (context.getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) >= Configuration.SCREENLAYOUT_SIZE_XLARGE;
  }

  /**
   * Determines whether the simplified settings UI should be shown. This is
   * true if this is forced via {@link #ALWAYS_SIMPLE_PREFS}, or the device
   * doesn't have newer APIs like {@link PreferenceFragment}, or the device
   * doesn't have an extra-large screen. In these cases, a single-pane
   * "simplified" settings UI should be shown.
   */
  private static boolean isSimplePreferences(Context context) {
    return ALWAYS_SIMPLE_PREFS
        || Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB
        || !isXLargeTablet(context);
  }

  /** {@inheritDoc} */
  @Override
  @TargetApi(Build.VERSION_CODES.HONEYCOMB)
  public void onBuildHeaders(List<Header> target) {
    if (!isSimplePreferences(this)) {
      loadHeadersFromResource(R.xml.pref_headers, target);
    }
  }

  /**
   * A preference value change listener that updates the preference's summary
   * to reflect its new value.
   */
  private static Preference.OnPreferenceChangeListener sBindPreferenceSummaryToValueListener = new Preference.OnPreferenceChangeListener() {
    @Override
    public boolean onPreferenceChange(Preference preference, Object value) {
      String stringValue = value.toString();
      if (preference instanceof ListPreference) {
        // For list preferences, look up the correct display value in
        // the preference's 'entries' list.
        ListPreference listPreference = (ListPreference) preference;
        int index = listPreference.findIndexOfValue(stringValue);

        // Set the summary to reflect the new value.
        preference
            .setSummary(index >= 0 ? listPreference.getEntries()[index]
                : null);

      } else {
        // For all other preferences, set the summary to the value's
        // simple string representation.
        preference.setSummary(stringValue);
      }
      return true;
    }
  };

  /**
   * Binds a preference's summary to its value. More specifically, when the
   * preference's value is changed, its summary (line of text below the
   * preference title) is updated to reflect the value. The summary is also
   * immediately updated upon calling this method. The exact display format is
   * dependent on the type of preference.
   * 
   * @see #sBindPreferenceSummaryToValueListener
   */
  private static void bindPreferenceSummaryToValue(Preference preference) {
    // Set the listener to watch for value changes.
    preference
        .setOnPreferenceChangeListener(sBindPreferenceSummaryToValueListener);

    // Trigger the listener immediately with the preference's
    // current value.
    sBindPreferenceSummaryToValueListener.onPreferenceChange(
        preference,
        PreferenceManager.getDefaultSharedPreferences(
            preference.getContext()).getString(preference.getKey(),
            ""));
  }

}

Java Source Code List

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