Android Open Source - bankomatinfos Settings Activity

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License

The source code is released under:
GNU General Public License
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Java Source Code

package at.zweng.bankomatinfos.ui;
/*ww w. j  av  a 2 s.c om*/
import java.util.List;

import android.annotation.TargetApi;
import android.content.Context;
import android.content.res.Configuration;
import android.os.Build;
import android.os.Bundle;
import android.preference.PreferenceActivity;
import android.preference.PreferenceFragment;
import android.support.v4.app.NavUtils;
import android.view.MenuItem;
import at.zweng.bankomatinfos2.R;

/**
 * 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 {
  /**
   * 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.
   */
  private void setupActionBar() {
    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
      //
      // 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);
  }

  /** {@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);
    }
  }

  /**
   * 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 GeneralPreferenceFragment extends PreferenceFragment {
    @Override
    public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      addPreferencesFromResource(R.xml.pref_general);
    }
  }

  /**
   * Important fix for this vulnerability:<br>
   * <br>
   * http://securityintelligence.com/wp-content
   * /uploads/2013/12/android-collapses-into-fragments.pdf <br>
   * <br>
   * http://securityintelligence
   * .com/new-vulnerability-android-framework-fragment-injection/#
   * 
   * @see android.preference.PreferenceActivity#isValidFragment(java.lang.String)
   */
  @Override
  protected boolean isValidFragment(String fragmentName) {
    if (GeneralPreferenceFragment.class.getName().equals(fragmentName)) {
      return true;
    }
    return false;
  }

}
Java Source Code List
