Android Open Source - android-002 Settings Fragment

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License

The source code is released under:
Apache License
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Java Source Code

package com.michaelfitzmaurice.dailyselfie.settings;
/*from w  w w.  j av a  2s.  co m*/
import static com.michaelfitzmaurice.dailyselfie.Alarms.ALARM_INTERVAL_PREFERENCES_KEY;
import static com.michaelfitzmaurice.dailyselfie.Alarms.NEXT_ALARM_DUE_PREFERENCES_KEY;
import static com.michaelfitzmaurice.dailyselfie.SelfieListActivity.LOG_TAG;
import static java.lang.String.format;

import java.util.Date;

import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
import android.os.Bundle;
import android.preference.Preference;
import android.preference.Preference.OnPreferenceChangeListener;
import android.preference.PreferenceFragment;
import android.preference.SwitchPreference;
import android.util.Log;
import android.widget.Toast;

import com.michaelfitzmaurice.dailyselfie.AlarmTimeInterval;
import com.michaelfitzmaurice.dailyselfie.Alarms;
import com.michaelfitzmaurice.dailyselfie.R;

public class SettingsFragment extends PreferenceFragment {
  
  private SwitchPreference notificationSwitch;
  private OnSharedPreferenceChangeListener preferenceListener;
  
  @Override
  public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    
    addPreferencesFromResource(R.xml.preferences);
    
    notificationSwitch = 
      (SwitchPreference)findPreference( 
          getString(R.string.notifications_switch_key) );
    notificationSwitch.setTitle(R.string.notifications_switch_title);
    if ( notificationSwitch.isChecked() ) {
      notificationSwitch.setSummary( alarmNextDueString() );
    } else {
      notificationSwitch.setSummary(
          R.string.notifications_switched_off_confirmation);
    }
    notificationSwitch.setOnPreferenceChangeListener(
      new OnPreferenceChangeListener() {
      
        @Override
        public boolean onPreferenceChange(Preference preference, 
                          Object newValue) {
          boolean switchValue = (Boolean)newValue;
          Log.d(LOG_TAG, "New value for notification switch will be " 
                  + switchValue);
          if (switchValue == false) {
            Log.d(LOG_TAG, "Disabling notifications... ");
            Alarms.getInstance().cancel();
            SettingsFragment.this.notificationSwitch.setSummary(
              R.string.notifications_switched_off_confirmation);
            showToast(R.string.notifications_switched_off_confirmation);
          } else {
            Log.d(LOG_TAG, "Enabling notifications... ");
            AlarmTimeInterval interval = getAlarmInterval(); 
            Alarms.getInstance().set(interval);
            SettingsFragment.this.notificationSwitch.setSummary( 
              alarmNextDueString() );
            showToast(R.string.notifications_switched_on_confirmation,
                  interval.getDays(),
                  interval.getHours(),
                  interval.getMinutes() );
          }
          
          return true;
        }
      }
    );
    
    preferenceListener = new NextAlarmPreferenceListener();
    getActivity().getSharedPreferences(LOG_TAG, Context.MODE_PRIVATE) 
      .registerOnSharedPreferenceChangeListener(preferenceListener);
  }
  
  @Override
  public void onDestroy() {
    
    if (preferenceListener != null) {
      getActivity().getSharedPreferences(LOG_TAG, Context.MODE_PRIVATE)
        .unregisterOnSharedPreferenceChangeListener(preferenceListener);
    }
    super.onDestroy();
  }

  private AlarmTimeInterval getAlarmInterval() {
    
    AlarmTimeInterval alarmInterval = null;
    SharedPreferences prefs = 
      getActivity().getSharedPreferences(LOG_TAG, Context.MODE_PRIVATE);
    String alarmIntervalString = 
      prefs.getString(ALARM_INTERVAL_PREFERENCES_KEY, null);
    if (alarmIntervalString != null) {
      alarmInterval = new AlarmTimeInterval(alarmIntervalString);
    }
    
    return alarmInterval;
  }
  
  private void showToast(int messageId, Object... formatArgs) {
      
      String message = getActivity().getString(messageId);
      if (formatArgs != null) {
        message = format(message, formatArgs);
      }
      
      Toast.makeText(getActivity(),
            message, 
            Toast.LENGTH_SHORT)
        .show();
    }
  
  private long alarmNextDueMs() {
    
      SharedPreferences sharedPrefs = 
        getActivity().getSharedPreferences(LOG_TAG, Context.MODE_PRIVATE);
    long alarmNextDueMs = 
      sharedPrefs.getLong(NEXT_ALARM_DUE_PREFERENCES_KEY, -1);
    
      return alarmNextDueMs;
    }
  
  private String alarmNextDueString() {
    
    return format(getString(R.string.notifications_next_due), 
            new Date( alarmNextDueMs() ).toString() );
  }
  
  private class NextAlarmPreferenceListener 
  implements OnSharedPreferenceChangeListener {

    @Override
        public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, 
                            String key) {
      
      if ( NEXT_ALARM_DUE_PREFERENCES_KEY.equals(key) ) {
        Log.d(LOG_TAG, 
          "Updating setting notification switch summary in response " 
              + "to change in shared preferences key " 
              + NEXT_ALARM_DUE_PREFERENCES_KEY);
        notificationSwitch.setSummary( alarmNextDueString() );
      }
        }
  }
}
Java Source Code List
