Android Open Source - android-edittext-validator Settings Activity

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License

The source code is released under:

MIT License

Java Source Code

package com.andreabaccega.edittextformexample;
//from   w  w  w  . j  a  v a2  s.  c  o  m
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;

/**
 * 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
{
  /**
   * 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( SettingsActivity.sBindPreferenceSummaryToValueListener );

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

  /**
   * 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 SettingsActivity.ALWAYS_SIMPLE_PREFS || Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB
        || !SettingsActivity.isXLargeTablet( context );
  }

  /**
   * 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;
  }

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

  /**
   * 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 );
    }
  }

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

    // Class<ContactPreferenceFragment> a = ContactPreferenceFragment.class;

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

    // Add 'general' preferences.
    PreferenceCategory fakeHeader = new PreferenceCategory( this );
    addPreferencesFromResource( R.xml.pref_contact );

    SettingsActivity.bindPreferenceSummaryToValue( findPreference( SettingsActivity.PREF_KEY_FULL_NAME ) );
    SettingsActivity.bindPreferenceSummaryToValue( findPreference( SettingsActivity.PREF_KEY_ADDRESS ) );
    SettingsActivity.bindPreferenceSummaryToValue( findPreference( SettingsActivity.PREF_KEY_PHONE_NUMBER ) );
    SettingsActivity.bindPreferenceSummaryToValue( findPreference( SettingsActivity.PREF_KEY_EMAIL ) );
  }

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

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

    setupSimplePreferencesScreen();
  }

  /**
   * This fragment shows general preferences only. It is used when the activity is showing a two-pane settings UI.
   */
  @TargetApi( Build.VERSION_CODES.HONEYCOMB )
  public static class ContactPreferenceFragment
      extends PreferenceFragment
  {

    @Override
    public void onCreate( Bundle savedInstanceState )
    {
      super.onCreate( savedInstanceState );
      addPreferencesFromResource( R.xml.pref_contact );

      // Bind the summaries of EditText/List/Dialog/Ringtone preferences
      // to their values. When their values change, their summaries are
      // updated to reflect the new value, per the Android Design
      // guidelines.
      SettingsActivity.bindPreferenceSummaryToValue( findPreference( SettingsActivity.PREF_KEY_FULL_NAME ) );
      SettingsActivity.bindPreferenceSummaryToValue( findPreference( SettingsActivity.PREF_KEY_ADDRESS ) );
      SettingsActivity.bindPreferenceSummaryToValue( findPreference( SettingsActivity.PREF_KEY_PHONE_NUMBER ) );
      SettingsActivity.bindPreferenceSummaryToValue( findPreference( SettingsActivity.PREF_KEY_EMAIL ) );

    }
  }

  public static final String PREF_KEY_EMAIL = "email";

  public static final String PREF_KEY_PHONE_NUMBER = "phone_number";

  public static final String PREF_KEY_ADDRESS = "address";

  public static final String PREF_KEY_FULL_NAME = "full_name";

  /**
   * 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;

  /**
   * A preference value change listener that updates the preference's summary to reflect its new value.
   */
  private static Preference.OnPreferenceChangeListener sBindPreferenceSummaryToValueListener = new Preference.OnPreferenceChangeListener()
  {

    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;
    }
  };
}

Java Source Code List

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