package nodomain.freeyourgadget.gadgetbridge.activities; import android.os.Bundle; import android.preference.ListPreference; import android.preference.Preference; import android.preference.PreferenceActivity; import android.preference.PreferenceManager; import android.support.v4.app.NavUtils; import android.view.MenuItem; import org.slf4j.Logger; import org.slf4j.LoggerFactory; /** * A settings activity with support for preferences directly displaying their value. * If you combine such preferences with a custom OnPreferenceChangeListener, you have * to set that listener in #onCreate, *not* in #onPostCreate, otherwise the value will * not be displayed. */ public class AbstractSettingsActivity extends PreferenceActivity { private static final Logger LOG = LoggerFactory.getLogger(AbstractSettingsActivity.class); /** * A preference value change listener that updates the preference's summary * to reflect its new value. */ private static class SimpleSetSummaryOnChangeListener implements Preference.OnPreferenceChangeListener { @Override public boolean onPreferenceChange(Preference preference, Object value) { updateSummary(preference, value); return true; } public void updateSummary(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); } } } private static class ExtraSetSummaryOnChangeListener extends SimpleSetSummaryOnChangeListener { private Preference.OnPreferenceChangeListener delegate; public ExtraSetSummaryOnChangeListener(Preference.OnPreferenceChangeListener delegate) { this.delegate = delegate; } @Override public boolean onPreferenceChange(Preference preference, Object value) { boolean result = delegate.onPreferenceChange(preference, value); if (result) { return super.onPreferenceChange(preference, value); } return false; } } private static SimpleSetSummaryOnChangeListener sBindPreferenceSummaryToValueListener = new SimpleSetSummaryOnChangeListener(); @Override protected void onPostCreate(Bundle savedInstanceState) { super.onPostCreate(savedInstanceState); getActionBar().setDisplayHomeAsUpEnabled(true); for (String prefKey : getPreferenceKeysWithSummary()) { final Preference pref = findPreference(prefKey); if (pref != null) { bindPreferenceSummaryToValue(pref); } else { LOG.error("Unknown preference key: " + prefKey + ", unable to display value."); } } } /** * Subclasses should reimplement this to return the keys of those * preferences which should print its values as a summary below the * preference name. */ protected String[] getPreferenceKeysWithSummary() { return new String[0]; } /** * 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. SimpleSetSummaryOnChangeListener listener = null; Preference.OnPreferenceChangeListener existingListener = preference.getOnPreferenceChangeListener(); if (existingListener != null) { listener = new ExtraSetSummaryOnChangeListener(existingListener); } else { listener = sBindPreferenceSummaryToValueListener; } preference.setOnPreferenceChangeListener(listener); // Trigger the listener immediately with the preference's current value. try { listener.updateSummary(preference, PreferenceManager .getDefaultSharedPreferences(preference.getContext()) .getString(preference.getKey(), "")); } catch (ClassCastException cce) { //the preference is not a string, use the provided summary //TODO: it shows true/false instead of the xml summary listener.updateSummary(preference, preference.getSummary()); } } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case android.R.id.home: NavUtils.navigateUpFromSameTask(this); return true; } return super.onOptionsItemSelected(item); } }