Android Open Source - rwestful-android Settings Activity

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License

The source code is released under:

MIT License

Java Source Code

package com.rwestful.android;
/*from  ww  w. j a  v  a  2s .  c om*/
import android.app.ActionBar;
import android.annotation.TargetApi;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
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.util.Log;
import android.view.MenuItem;

import java.util.List;

import com.rwestful.android.web.services.HTTPService;


/**
 * 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 implements SharedPreferences.OnSharedPreferenceChangeListener {
  /**
   * 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);
    final ActionBar actionBar = getActionBar();
    actionBar.setDisplayHomeAsUpEnabled(true);
    actionBar.setDisplayUseLogoEnabled(true);
  }  

  @Override
  protected void onResume() {
    super.onResume();
    SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
    prefs.registerOnSharedPreferenceChangeListener(this);
    //prefs.registerOnSharedPreferenceChangeListener(MainActivity.listener);
  }

  @Override
  protected void onPause() {
    super.onPause();
    SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
    prefs.unregisterOnSharedPreferenceChangeListener(this);  
  }

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

    setupSimplePreferencesScreen();
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
    // Respond to the action bar's Up/Home button
    case android.R.id.home:
      finish();
      return true;
    }
    return super.onOptionsItemSelected(item);
  }

  /**
   * 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 (!isSimplePreferences(this)) {
      return;
    }

    Log.d("SIMPLEPREFS", "CHOSEN");

    // 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);

    PreferenceCategory fakeHeader = new PreferenceCategory(this);

    // Add 'data and sync' preferences, and a corresponding header.
    fakeHeader = new PreferenceCategory(this);
    fakeHeader.setTitle(R.string.pref_header_server);
    getPreferenceScreen().addPreference(fakeHeader);
    addPreferencesFromResource(R.xml.pref_server);

    // 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.
    //bindPreferenceSummaryToValue(findPreference("example_text"));
    //bindPreferenceSummaryToValue(findPreference("example_list"));
    //bindPreferenceSummaryToValue(findPreference("notifications_new_message_ringtone"));
    //bindPreferenceSummaryToValue(findPreference("sync_frequency"));
  }

  /** {@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(),
                ""));
  }

  /**
   * 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);


      // 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.
      bindPreferenceSummaryToValue(findPreference("start_server_on_app_start"));
      bindPreferenceSummaryToValue(findPreference("start_server_on_boot"));
      bindPreferenceSummaryToValue(findPreference("server_listen_localhost_only"));
    }
  }

  /**
   * This fragment shows server preferences only. It is used when the
   * activity is showing a two-pane settings UI.
   */
  @TargetApi(Build.VERSION_CODES.HONEYCOMB)
  public static class ServerPreferenceFragment extends PreferenceFragment {
    @Override
    public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      addPreferencesFromResource(R.xml.pref_server);
      bindPreferenceSummaryToValue(findPreference("server_listen_localhost_only"));
    }
  }     

  @Override
  public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) 
  {
    android.util.Log.v("PREFERENCE", "[" + key + "]");
    if (key.equals("server_listen_localhost_only")) {
      android.util.Log.v("PREFERENCE!", "[" + key + "]");
      Context context = SettingsActivity.this.getApplicationContext();
      context.stopService(new Intent(context, HTTPService.class));
        context.startService(new Intent(context, HTTPService.class));
    }
  }

}

Java Source Code List

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