1 /* 2 * Copyright 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.system; 18 19 import static android.app.Activity.RESULT_OK; 20 21 import android.content.Intent; 22 import android.os.Bundle; 23 import android.view.View; 24 import android.view.ViewTreeObserver; 25 26 import androidx.annotation.NonNull; 27 import androidx.annotation.Nullable; 28 import androidx.annotation.VisibleForTesting; 29 import androidx.annotation.XmlRes; 30 31 import com.android.car.settings.R; 32 import com.android.car.settings.common.ActivityResultCallback; 33 import com.android.car.settings.common.Logger; 34 import com.android.car.settings.common.SettingsFragment; 35 import com.android.car.settings.security.CheckLockActivity; 36 import com.android.car.ui.recyclerview.CarUiRecyclerView; 37 import com.android.car.ui.toolbar.MenuItem; 38 39 import java.util.Collections; 40 import java.util.List; 41 42 /** 43 * Presents the user with the option to reset the head unit to its default "factory" state. If a 44 * user confirms, the user is first required to authenticate and then presented with a secondary 45 * confirmation: {@link FactoryResetConfirmFragment}. The user must scroll to the bottom of the page 46 * before proceeding. 47 */ 48 public class FactoryResetFragment extends SettingsFragment implements ActivityResultCallback { 49 50 private static final Logger LOG = new Logger(FactoryResetFragment.class); 51 // Arbitrary request code for starting CheckLockActivity when the reset button is clicked. 52 @VisibleForTesting 53 static final int CHECK_LOCK_REQUEST_CODE = 88; 54 55 private MenuItem mFactoryResetButton; 56 57 @Override getToolbarMenuItems()58 public List<MenuItem> getToolbarMenuItems() { 59 return Collections.singletonList(mFactoryResetButton); 60 } 61 62 @Override onCreate(Bundle savedInstanceState)63 public void onCreate(Bundle savedInstanceState) { 64 super.onCreate(savedInstanceState); 65 66 mFactoryResetButton = new MenuItem.Builder(getContext()) 67 .setTitle(R.string.factory_reset_button_text) 68 .setEnabled(false) 69 .setOnClickListener(i -> 70 startActivityForResult(new Intent(getContext(), CheckLockActivity.class), 71 CHECK_LOCK_REQUEST_CODE, /* callback= */ FactoryResetFragment.this)) 72 .build(); 73 } 74 75 @Override 76 @XmlRes getPreferenceScreenResId()77 protected int getPreferenceScreenResId() { 78 return R.xml.factory_reset_fragment; 79 } 80 81 @Override onViewCreated(@onNull View view, @Nullable Bundle savedInstanceState)82 public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) { 83 super.onViewCreated(view, savedInstanceState); 84 85 CarUiRecyclerView recyclerView = view.findViewById(R.id.settings_recycler_view); 86 if (recyclerView != null) { 87 recyclerView.getViewTreeObserver().addOnGlobalLayoutListener( 88 new ViewTreeObserver.OnGlobalLayoutListener() { 89 @Override 90 public void onGlobalLayout() { 91 mFactoryResetButton.setEnabled(isAtEnd(recyclerView)); 92 recyclerView.getViewTreeObserver().removeOnGlobalLayoutListener(this); 93 } 94 }); 95 recyclerView.addOnScrollListener( 96 new CarUiRecyclerView.OnScrollListener() { 97 @Override 98 public void onScrolled(CarUiRecyclerView recyclerView, int dx, int dy) { 99 if (isAtEnd(recyclerView)) { 100 mFactoryResetButton.setEnabled(true); 101 } 102 } 103 104 @Override 105 public void onScrollStateChanged(CarUiRecyclerView recyclerView, 106 int newState) { 107 // no-op 108 } 109 }); 110 } else { 111 LOG.e("No RecyclerView found"); 112 requireActivity().onBackPressed(); 113 } 114 } 115 116 @Override processActivityResult(int requestCode, int resultCode, @Nullable Intent data)117 public void processActivityResult(int requestCode, int resultCode, @Nullable Intent data) { 118 if (requestCode == CHECK_LOCK_REQUEST_CODE && resultCode == RESULT_OK) { 119 launchFragment(new FactoryResetConfirmFragment()); 120 } 121 } 122 123 /** Returns {@code true} if the RecyclerView is completely displaying the last item. */ isAtEnd(CarUiRecyclerView recyclerView)124 private boolean isAtEnd(CarUiRecyclerView recyclerView) { 125 if (recyclerView.getAdapter().getItemCount() == 0) { 126 return true; 127 } 128 129 return recyclerView.findLastCompletelyVisibleItemPosition() 130 == recyclerView.getAdapter().getItemCount() - 1; 131 } 132 } 133