Android Open Source - Sunshine Settings Activity

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright (C) 2014 The Android Open Source Project
 *//w w w. j a  v  a  2s.c om
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.example.kylelehman.sunshine;

import android.os.Bundle;
import android.preference.ListPreference;
import android.preference.Preference;
import android.preference.PreferenceActivity;
import android.preference.PreferenceManager;

import com.example.kylelehman.sunshine.data.WeatherContract;

/**
 * A {@link PreferenceActivity} that presents a set of application 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 Preference.OnPreferenceChangeListener {

  // since we use the preference change initially to populate the summary
  // field, we'll ignore that change at start of the activity
  boolean mBindingPreference;

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    // Add 'general' preferences, defined in the XML file
    addPreferencesFromResource(R.xml.pref_general);

    // For all preferences, attach an OnPreferenceChangeListener so the UI summary can be
    // updated when the preference changes.
    bindPreferenceSummaryToValue(findPreference(getString(R.string.pref_location_key)));
    bindPreferenceSummaryToValue(findPreference(getString(R.string.pref_units_key)));
  }

  /**
   * Attaches a listener so the summary is always updated with the preference value.
   * Also fires the listener once, to initialize the summary (so it shows up before the value
   * is changed.)
   */
  private void bindPreferenceSummaryToValue(Preference preference) {
    mBindingPreference = true;

    // Set the listener to watch for value changes.
    preference.setOnPreferenceChangeListener(this);

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

    mBindingPreference = false;
  }

  @Override
  public boolean onPreferenceChange(Preference preference, Object value) {
    String stringValue = value.toString();

    // are we starting the preference activity?
    if ( !mBindingPreference ) {
      if (preference.getKey().equals(getString(R.string.pref_location_key))) {
        FetchWeatherTask weatherTask = new FetchWeatherTask(this);
        String location = value.toString();
        weatherTask.execute(location);
      } else {
        // notify code that weather may be impacted
        getContentResolver().notifyChange(WeatherContract.WeatherEntry.CONTENT_URI, null);
      }
    }

    if (preference instanceof ListPreference) {
      // For list preferences, look up the correct display value in
      // the preference's 'entries' list (since they have separate labels/values).
      ListPreference listPreference = (ListPreference) preference;
      int prefIndex = listPreference.findIndexOfValue(stringValue);
      if (prefIndex >= 0) {
        preference.setSummary(listPreference.getEntries()[prefIndex]);
      }
    } else {
      // For 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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