1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.settingslib.widget; 18 19 import android.content.Context; 20 import android.support.v14.preference.PreferenceFragment; 21 import android.support.v7.preference.PreferenceScreen; 22 23 import com.android.settingslib.core.lifecycle.Lifecycle; 24 import com.android.settingslib.core.lifecycle.LifecycleObserver; 25 import com.android.settingslib.core.lifecycle.events.SetPreferenceScreen; 26 27 public class FooterPreferenceMixin implements LifecycleObserver, SetPreferenceScreen { 28 29 private final PreferenceFragment mFragment; 30 private FooterPreference mFooterPreference; 31 32 public FooterPreferenceMixin(PreferenceFragment fragment, Lifecycle lifecycle) { 33 mFragment = fragment; 34 lifecycle.addObserver(this); 35 } 36 37 @Override 38 public void setPreferenceScreen(PreferenceScreen preferenceScreen) { 39 if (mFooterPreference != null) { 40 preferenceScreen.addPreference(mFooterPreference); 41 } 42 } 43 44 /** 45 * Creates a new {@link FooterPreference}. 46 */ 47 public FooterPreference createFooterPreference() { 48 final PreferenceScreen screen = mFragment.getPreferenceScreen(); 49 if (mFooterPreference != null && screen != null) { 50 screen.removePreference(mFooterPreference); 51 } 52 mFooterPreference = new FooterPreference(getPrefContext()); 53 54 if (screen != null) { 55 screen.addPreference(mFooterPreference); 56 } 57 return mFooterPreference; 58 } 59 60 /** 61 * Returns an UI context with theme properly set for new Preference objects. 62 */ 63 private Context getPrefContext() { 64 return mFragment.getPreferenceManager().getContext(); 65 } 66 67 public boolean hasFooter() { 68 return mFooterPreference != null; 69 } 70 } 71 72
