1 /* 2 * Copyright (C) 2019 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.car.settings.common; 18 19 import androidx.fragment.app.Fragment; 20 21 import com.android.car.ui.toolbar.ToolbarController; 22 23 /** 24 * Implemented by Settings {@link android.app.Activity} instances to host Settings {@link Fragment} 25 * instances. 26 */ 27 public interface FragmentHost { 28 /** 29 * Launches a Fragment in the main container of the current Activity. 30 */ launchFragment(Fragment fragment)31 void launchFragment(Fragment fragment); 32 33 /** 34 * Pops the top off the Fragment stack. 35 */ goBack()36 void goBack(); 37 38 /** 39 * Shows a message to inform the user that the current feature is not available when driving. 40 */ showBlockingMessage()41 void showBlockingMessage(); 42 43 /** 44 * Returns the currently modifiable toolbar for the activity. 45 */ getToolbar()46 ToolbarController getToolbar(); 47 } 48