Java tutorial
/* * Copyright 2016 Olivr Falvai * * 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.ofalvai.bpinfo.ui.settings; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.content.SharedPreferences; import android.os.Build; import android.os.Bundle; import android.preference.ListPreference; import android.preference.Preference; import android.preference.PreferenceActivity; import android.preference.PreferenceManager; import android.provider.Settings; import android.support.annotation.NonNull; import android.support.v4.app.NavUtils; import android.support.v7.app.ActionBar; import android.support.v7.app.AlertDialog; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.widget.Toast; import com.jakewharton.processphoenix.ProcessPhoenix; import com.ofalvai.bpinfo.BpInfoApplication; import com.ofalvai.bpinfo.R; import com.ofalvai.bpinfo.ui.alertlist.AlertListActivity; import com.ofalvai.bpinfo.util.FabricUtils; import javax.inject.Inject; /** * 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 AppCompatPreferenceActivity implements SharedPreferences.OnSharedPreferenceChangeListener { private static final String TAG = "SettingsActivity"; @Inject SharedPreferences mSharedPreferences; public static Intent newIntent(Context context) { return new Intent(context, SettingsActivity.class); } /** * A preference value change listener that updates the preference's summary * to reflect its new value. */ private static final 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 { // 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(@NonNull 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(), "")); } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); BpInfoApplication.injector.inject(this); setupActionBar(); addPreferencesFromResource(R.xml.pref_general); PreferenceManager.setDefaultValues(this, R.xml.pref_general, false); bindPreferenceSummaryToValue(findPreference(getString(R.string.pref_key_language))); bindPreferenceSummaryToValue(findPreference(getString(R.string.pref_key_data_source))); } @Override protected void onResume() { super.onResume(); mSharedPreferences.registerOnSharedPreferenceChangeListener(this); } @Override protected void onPause() { super.onPause(); mSharedPreferences.unregisterOnSharedPreferenceChangeListener(this); } @Override public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) { // Language if (key.equals(getString(R.string.pref_key_language))) { String languageValue = sharedPreferences.getString(key, "default"); FabricUtils.logLanguageChange(languageValue); showLanguageRestartDialog(); } // Debug mode else if (key.equals(getString(R.string.pref_key_debug_mode))) { boolean state = mSharedPreferences.getBoolean(key, false); String text = state ? getString(R.string.debug_mode_on) : getString(R.string.debog_mode_off); Toast.makeText(this, text, Toast.LENGTH_LONG).show(); FabricUtils.logDebugMode(String.valueOf(state)); } // Data source else if (key.equals(getString(R.string.pref_key_data_source))) { Toast.makeText(this, R.string.data_source_changed_refreshed, Toast.LENGTH_SHORT).show(); FabricUtils.logDataSourceChange(mSharedPreferences.getString(key, "")); // Recreating AlertListActivity. This relies on BpInfoApplication's preference listener, // which can rebuild the Dagger dependency graph so that the new Activity (and its // Fragments' presenters) will use the new data source Intent intent = new Intent(this, AlertListActivity.class); intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK); this.startActivity(intent); } } @Override public boolean onCreateOptionsMenu(Menu menu) { if (shouldShowDebugMode()) { MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.menu_settings, menu); return true; } else { return false; } } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.menu_item_debug: final String key = getString(R.string.pref_key_debug_mode); boolean oldState = mSharedPreferences.getBoolean(key, false); mSharedPreferences.edit().putBoolean(key, !oldState).apply(); break; } return true; } @Override public boolean onMenuItemSelected(int featureId, MenuItem item) { int id = item.getItemId(); if (id == android.R.id.home) { NavUtils.navigateUpFromSameTask(this); return true; } return super.onMenuItemSelected(featureId, item); } /** * Set up the {@link android.app.ActionBar}, if the API is available. */ private void setupActionBar() { ActionBar actionBar = getSupportActionBar(); if (actionBar != null) { // Show the Up button in the action bar. actionBar.setDisplayHomeAsUpEnabled(true); } } private void showLanguageRestartDialog() { new AlertDialog.Builder(this).setTitle(getString(R.string.pref_language_dialog_title)) .setMessage(getString(R.string.pref_language_dialog_message)) .setNegativeButton(getString(R.string.pref_language_dialog_negative_button), null) .setPositiveButton(getString(R.string.pref_language_dialog_positive_button), new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { ProcessPhoenix.triggerRebirth(getApplicationContext()); } }) .show(); } /** * Only show debug mode when development settings are enabled on the device */ private boolean shouldShowDebugMode() { int devOptions = 0; if (Build.VERSION.SDK_INT == Build.VERSION_CODES.JELLY_BEAN) { devOptions = Settings.Secure.getInt(this.getContentResolver(), Settings.Secure.DEVELOPMENT_SETTINGS_ENABLED, 0); } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) { devOptions = Settings.Secure.getInt(this.getContentResolver(), Settings.Global.DEVELOPMENT_SETTINGS_ENABLED, 0); } return devOptions == 1; } }