Java tutorial
/* * Copyright (C) 2016 The Android Open Source Project * * 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.android.tv.settings.system; import android.content.Intent; import android.os.Bundle; import android.provider.Settings; import android.support.v17.preference.LeanbackPreferenceFragment; import android.support.v4.content.LocalBroadcastManager; import android.support.v7.preference.ListPreference; import android.support.v7.preference.Preference; import android.support.v7.preference.PreferenceGroup; import android.support.v7.preference.TwoStatePreference; import android.text.TextUtils; import com.android.internal.app.LocalePicker; import com.android.tv.settings.R; import com.android.tv.settings.RadioPreference; import java.util.List; public class CaptionFragment extends LeanbackPreferenceFragment implements Preference.OnPreferenceChangeListener { private static final String KEY_CAPTIONS_DISPLAY = "captions_display"; private static final String KEY_CAPTIONS_LANGUAGE = "captions_language"; private static final String KEY_CAPTIONS_TEXT_SIZE = "captions_text_size"; private static final String KEY_CAPTIONS_STYLE_GROUP = "captions_style"; private static final String KEY_CAPTIONS_STYLE_0 = "captions_style_0"; private static final String KEY_CAPTIONS_STYLE_1 = "captions_style_1"; private static final String KEY_CAPTIONS_STYLE_2 = "captions_style_2"; private static final String KEY_CAPTIONS_STYLE_3 = "captions_style_3"; private static final String KEY_CAPTIONS_STYLE_CUSTOM = "captions_style_custom"; private TwoStatePreference mCaptionsDisplayPref; private ListPreference mCaptionsLanguagePref; private ListPreference mCaptionsTextSizePref; private PreferenceGroup mCaptionsStyleGroup; private RadioPreference mCaptionsStyle0Pref; private RadioPreference mCaptionsStyle1Pref; private RadioPreference mCaptionsStyle2Pref; private RadioPreference mCaptionsStyle3Pref; private RadioPreference mCaptionsStyleCustomPref; public static CaptionFragment newInstance() { return new CaptionFragment(); } @Override public void onResume() { super.onResume(); refresh(); } @Override public void onCreatePreferences(Bundle savedInstanceState, String rootKey) { setPreferencesFromResource(R.xml.caption, null); mCaptionsDisplayPref = (TwoStatePreference) findPreference(KEY_CAPTIONS_DISPLAY); final List<LocalePicker.LocaleInfo> localeInfoList = LocalePicker.getAllAssetLocales(getContext(), false); final String[] langNames = new String[localeInfoList.size()]; final String[] langLocales = new String[localeInfoList.size()]; int i = 0; for (final LocalePicker.LocaleInfo info : localeInfoList) { langNames[i] = info.toString(); langLocales[i] = info.getLocale().toString(); i++; } mCaptionsLanguagePref = (ListPreference) findPreference(KEY_CAPTIONS_LANGUAGE); mCaptionsLanguagePref.setEntries(langNames); mCaptionsLanguagePref.setEntryValues(langLocales); mCaptionsLanguagePref.setOnPreferenceChangeListener(this); mCaptionsTextSizePref = (ListPreference) findPreference(KEY_CAPTIONS_TEXT_SIZE); mCaptionsTextSizePref.setOnPreferenceChangeListener(this); mCaptionsStyleGroup = (PreferenceGroup) findPreference(KEY_CAPTIONS_STYLE_GROUP); mCaptionsStyle0Pref = (RadioPreference) findPreference(KEY_CAPTIONS_STYLE_0); mCaptionsStyle1Pref = (RadioPreference) findPreference(KEY_CAPTIONS_STYLE_1); mCaptionsStyle2Pref = (RadioPreference) findPreference(KEY_CAPTIONS_STYLE_2); mCaptionsStyle3Pref = (RadioPreference) findPreference(KEY_CAPTIONS_STYLE_3); mCaptionsStyleCustomPref = (RadioPreference) findPreference(KEY_CAPTIONS_STYLE_CUSTOM); } @Override public boolean onPreferenceTreeClick(Preference preference) { final String key = preference.getKey(); if (TextUtils.isEmpty(key)) { return super.onPreferenceTreeClick(preference); } switch (key) { case KEY_CAPTIONS_DISPLAY: setCaptionsEnabled(((TwoStatePreference) preference).isChecked()); return true; case KEY_CAPTIONS_STYLE_0: setCaptionsStyle(0); mCaptionsStyle0Pref.setChecked(true); mCaptionsStyle0Pref.clearOtherRadioPreferences(mCaptionsStyleGroup); return true; case KEY_CAPTIONS_STYLE_1: setCaptionsStyle(1); mCaptionsStyle1Pref.setChecked(true); mCaptionsStyle1Pref.clearOtherRadioPreferences(mCaptionsStyleGroup); return true; case KEY_CAPTIONS_STYLE_2: setCaptionsStyle(2); mCaptionsStyle2Pref.setChecked(true); mCaptionsStyle2Pref.clearOtherRadioPreferences(mCaptionsStyleGroup); return true; case KEY_CAPTIONS_STYLE_3: setCaptionsStyle(3); mCaptionsStyle3Pref.setChecked(true); mCaptionsStyle3Pref.clearOtherRadioPreferences(mCaptionsStyleGroup); return true; case KEY_CAPTIONS_STYLE_CUSTOM: setCaptionsStyle(-1); mCaptionsStyleCustomPref.setChecked(true); mCaptionsStyleCustomPref.clearOtherRadioPreferences(mCaptionsStyleGroup); // Call to super to show custom configuration screen return super.onPreferenceTreeClick(preference); } return super.onPreferenceTreeClick(preference); } @Override public boolean onPreferenceChange(Preference preference, Object newValue) { final String key = preference.getKey(); if (TextUtils.isEmpty(key)) { throw new IllegalStateException("Unknown preference change"); } switch (key) { case KEY_CAPTIONS_LANGUAGE: setCaptionsLocale((String) newValue); break; case KEY_CAPTIONS_TEXT_SIZE: setCaptionsTextSize((String) newValue); break; default: throw new IllegalStateException("Preference change with unknown key " + key); } return true; } private void refresh() { mCaptionsDisplayPref.setChecked(getCaptionsEnabled()); mCaptionsLanguagePref.setValue(getCaptionsLocale()); mCaptionsTextSizePref.setValue(getCaptionsTextSize()); switch (getCaptionsStyle()) { default: case 0: mCaptionsStyle0Pref.setChecked(true); mCaptionsStyle0Pref.clearOtherRadioPreferences(mCaptionsStyleGroup); break; case 1: mCaptionsStyle1Pref.setChecked(true); mCaptionsStyle1Pref.clearOtherRadioPreferences(mCaptionsStyleGroup); break; case 2: mCaptionsStyle2Pref.setChecked(true); mCaptionsStyle2Pref.clearOtherRadioPreferences(mCaptionsStyleGroup); break; case 3: mCaptionsStyle3Pref.setChecked(true); mCaptionsStyle3Pref.clearOtherRadioPreferences(mCaptionsStyleGroup); break; case -1: mCaptionsStyleCustomPref.setChecked(true); mCaptionsStyleCustomPref.clearOtherRadioPreferences(mCaptionsStyleGroup); break; } } private boolean getCaptionsEnabled() { return Settings.Secure.getInt(getContext().getContentResolver(), Settings.Secure.ACCESSIBILITY_CAPTIONING_ENABLED, 0) != 0; } private void setCaptionsEnabled(boolean enabled) { Settings.Secure.putInt(getContext().getContentResolver(), Settings.Secure.ACCESSIBILITY_CAPTIONING_ENABLED, enabled ? 1 : 0); } private int getCaptionsStyle() { return Settings.Secure.getInt(getContext().getContentResolver(), Settings.Secure.ACCESSIBILITY_CAPTIONING_PRESET, 0); } private void setCaptionsStyle(int style) { Settings.Secure.putInt(getContext().getContentResolver(), Settings.Secure.ACCESSIBILITY_CAPTIONING_PRESET, style); LocalBroadcastManager.getInstance(getContext()) .sendBroadcast(new Intent(CaptionSettingsFragment.ACTION_REFRESH_CAPTIONS_PREVIEW)); } private String getCaptionsLocale() { return Settings.Secure.getString(getContext().getContentResolver(), Settings.Secure.ACCESSIBILITY_CAPTIONING_LOCALE); } private void setCaptionsLocale(String locale) { Settings.Secure.putString(getContext().getContentResolver(), Settings.Secure.ACCESSIBILITY_CAPTIONING_LOCALE, locale); } private String getCaptionsTextSize() { final float textSize = Settings.Secure.getFloat(getContext().getContentResolver(), Settings.Secure.ACCESSIBILITY_CAPTIONING_FONT_SCALE, 1); if (0 <= textSize && textSize < .375) { return "0.25"; } else if (textSize < .75) { return "0.5"; } else if (textSize < 1.25) { return "1.0"; } else if (textSize < 1.75) { return "1.5"; } else if (textSize < 2.5) { return "2.0"; } return "1.0"; } private void setCaptionsTextSize(String textSize) { Settings.Secure.putFloat(getContext().getContentResolver(), Settings.Secure.ACCESSIBILITY_CAPTIONING_FONT_SCALE, Float.parseFloat(textSize)); } }