1 /* 2 * Copyright (C) 2017 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.settings.security; 18 19 import android.content.Context; 20 import android.os.UserManager; 21 import android.security.KeyStore; 22 import android.support.v7.preference.PreferenceScreen; 23 24 import com.android.settingslib.RestrictedPreference; 25 import com.android.settingslib.core.lifecycle.Lifecycle; 26 import com.android.settingslib.core.lifecycle.LifecycleObserver; 27 import com.android.settingslib.core.lifecycle.events.OnResume; 28 29 public class ResetCredentialsPreferenceController extends RestrictedEncryptionPreferenceController 30 implements LifecycleObserver, OnResume { 31 32 private static final String KEY_RESET_CREDENTIALS = "credentials_reset"; 33 34 private final KeyStore mKeyStore; 35 36 private RestrictedPreference mPreference; 37 38 public ResetCredentialsPreferenceController(Context context, Lifecycle lifecycle) { 39 super(context, UserManager.DISALLOW_CONFIG_CREDENTIALS); 40 mKeyStore = KeyStore.getInstance(); 41 if (lifecycle != null) { 42 lifecycle.addObserver(this); 43 } 44 } 45 46 @Override 47 public String getPreferenceKey() { 48 return KEY_RESET_CREDENTIALS; 49 } 50 51 @Override 52 public void displayPreference(PreferenceScreen screen) { 53 super.displayPreference(screen); 54 mPreference = (RestrictedPreference) screen.findPreference(getPreferenceKey()); 55 } 56 57 @Override 58 public void onResume() { 59 if (mPreference != null && !mPreference.isDisabledByAdmin()) { 60 mPreference.setEnabled(!mKeyStore.isEmpty()); 61 } 62 } 63 } 64
