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package com.finger.sciencequiz; /*from ww w. j a va 2 s . c o m*/ import android.annotation.TargetApi; import android.content.Context; import android.content.res.Configuration; import android.media.Ringtone; import android.media.RingtoneManager; import android.net.Uri; 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.preference.RingtonePreference; import android.text.TextUtils; import android.view.MenuItem; import android.support.v4.app.NavUtils; import java.util.List; /** * 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. */ @TargetApi (Build.VERSION_CODES.HONEYCOMB) private void setupActionBar () { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) { // Show the Up button in the action bar. getActionBar ().setDisplayHomeAsUpEnabled (true); } } @Override public boolean onOptionsItemSelected (MenuItem item) { int id = item.getItemId (); if (id == 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 // // TODO: 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); // Add 'notifications' preferences, and a corresponding header. PreferenceCategory fakeHeader = new PreferenceCategory (this); fakeHeader.setTitle (R.string.pref_header_notifications); getPreferenceScreen ().addPreference (fakeHeader); addPreferencesFromResource (R.xml.pref_notification); // Add 'data and sync' preferences, and a corresponding header. fakeHeader = new PreferenceCategory (this); fakeHeader.setTitle (R.string.pref_header_data_sync); getPreferenceScreen ().addPreference (fakeHeader); addPreferencesFromResource (R.xml.pref_data_sync); // 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 if (preference instanceof RingtonePreference) { // For // ringtone // preferences, // look // up // the // correct // display // value // using // RingtoneManager. if (TextUtils.isEmpty (stringValue)) { // Empty // values // correspond // to // 'silent' // (no // ringtone). preference.setSummary (R.string.pref_ringtone_silent); } else { Ringtone ringtone = RingtoneManager.getRingtone ( preference.getContext (), Uri.parse (stringValue)); if (ringtone == null) { // Clear // the // summary // if // there // was // a // lookup // error. preference.setSummary (null); } else { // Set // the // summary // to // reflect // the // new // ringtone // display // name. String name = ringtone.getTitle (preference.getContext ()); preference.setSummary (name); } } } 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 ("example_text")); bindPreferenceSummaryToValue (findPreference ("example_list")); } } /** * This fragment shows notification preferences only. It is used when the * activity is showing a two-pane settings UI. */ @TargetApi (Build.VERSION_CODES.HONEYCOMB) public static class NotificationPreferenceFragment extends PreferenceFragment { @Override public void onCreate (Bundle savedInstanceState) { super.onCreate (savedInstanceState); addPreferencesFromResource (R.xml.pref_notification); // 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 ("notifications_new_message_ringtone")); } } /** * This fragment shows data and sync preferences only. It is used when the * activity is showing a two-pane settings UI. */ @TargetApi (Build.VERSION_CODES.HONEYCOMB) public static class DataSyncPreferenceFragment extends PreferenceFragment { @Override public void onCreate (Bundle savedInstanceState) { super.onCreate (savedInstanceState); addPreferencesFromResource (R.xml.pref_data_sync); // 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 ("sync_frequency")); } } }