Java tutorial
/* * Copyright (c) 2015 Jarrad Hope * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ package io.syng.activity; import android.annotation.TargetApi; import android.content.Context; 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.PreferenceFragment; import android.preference.PreferenceManager; import android.widget.Toast; import org.apache.cordova.ConfigXmlParser; import org.apache.cordova.CordovaPreferences; import org.apache.cordova.CordovaWebView; import org.apache.cordova.CordovaWebViewImpl; import java.net.URL; import java.util.List; import io.syng.R; import io.syng.app.SyngApplication; /** * 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. */ @SuppressWarnings("deprecation") 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); setupSimplePreferencesScreen(); Preference button = (Preference) findPreference("clearCache"); button.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() { @Override public boolean onPreferenceClick(Preference preference) { ConfigXmlParser parser = new ConfigXmlParser(); parser.parse(SettingsActivity.this); CordovaPreferences preferences = parser.getPreferences(); preferences.setPreferencesBundle(SettingsActivity.this.getIntent().getExtras()); CordovaWebView webView = new CordovaWebViewImpl( CordovaWebViewImpl.createEngine(SettingsActivity.this, preferences)); webView.clearCache(); return true; } }); } /** * 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); bindPreferenceSummaryToValue(findPreference(getString(R.string.pref_json_rpc_server_key))); bindPreferenceSummaryToValue(findPreference(getString(R.string.pref_running_mode_key))); /* // 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")); */ } private void bindPreferenceSummaryToValue(Preference preference) { // Set the listener to watch for value changes. preference.setOnPreferenceChangeListener(mBindPreferenceSummaryToValueListener); // Trigger the listener immediately with the preference's // current value. mBindPreferenceSummaryToValueListener.onPreferenceChange(preference, PreferenceManager .getDefaultSharedPreferences(preference.getContext()).getString(preference.getKey(), "")); } private Preference.OnPreferenceChangeListener mBindPreferenceSummaryToValueListener = new Preference.OnPreferenceChangeListener() { @Override public boolean onPreferenceChange(Preference preference, Object value) { String stringValue = value.toString(); String key = preference.getKey(); 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); Preference jsonRPC = findPreference(getString(R.string.pref_json_rpc_server_key)); jsonRPC.setEnabled(!stringValue.equals(getString(R.string.pref_running_mode_full_value))); } else if (key.equals(getString(R.string.pref_json_rpc_server_key))) { try { URL url = new URL(stringValue); preference.setSummary("Current server address is " + stringValue); SyngApplication.sEthereumConnector.changeJsonRpc(stringValue); } catch (Exception e) { Toast.makeText(SettingsActivity.this, "Invalid url address...", Toast.LENGTH_SHORT).show(); return false; } } else { preference.setSummary(stringValue); } return true; } }; /** * {@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. */ @SuppressWarnings({ "PointlessBooleanExpression", "ConstantConditions" }) 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) { } /** * A preference value change listener that updates the preference's summary * to reflect its new value. */ /** * 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 #mBindPreferenceSummaryToValueListener */ // /** // * 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("runningMode")); // } // } }