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.development; 18 19 import android.content.Context; 20 import android.os.RemoteException; 21 import android.os.ServiceManager; 22 import android.os.SystemProperties; 23 import android.os.storage.IStorageManager; 24 import android.support.annotation.VisibleForTesting; 25 import android.support.v7.preference.Preference; 26 import android.text.TextUtils; 27 28 import com.android.settings.R; 29 import com.android.settings.core.PreferenceControllerMixin; 30 import com.android.settingslib.development.DeveloperOptionsPreferenceController; 31 32 public class FileEncryptionPreferenceController extends DeveloperOptionsPreferenceController 33 implements PreferenceControllerMixin { 34 35 private static final String KEY_CONVERT_FBE = "convert_to_file_encryption"; 36 private static final String KEY_STORAGE_MANAGER = "mount"; 37 38 @VisibleForTesting 39 static final String FILE_ENCRYPTION_PROPERTY_KEY = "ro.crypto.type"; 40 41 private final IStorageManager mStorageManager; 42 FileEncryptionPreferenceController(Context context)43 public FileEncryptionPreferenceController(Context context) { 44 super(context); 45 46 mStorageManager = getStorageManager(); 47 } 48 49 @Override isAvailable()50 public boolean isAvailable() { 51 if (mStorageManager == null) { 52 return false; 53 } 54 55 try { 56 return mStorageManager.isConvertibleToFBE(); 57 } catch (RemoteException e) { 58 return false; 59 } 60 } 61 62 @Override getPreferenceKey()63 public String getPreferenceKey() { 64 return KEY_CONVERT_FBE; 65 } 66 67 @Override updateState(Preference preference)68 public void updateState(Preference preference) { 69 if (!TextUtils.equals("file", 70 SystemProperties.get(FILE_ENCRYPTION_PROPERTY_KEY, "none" /* default */))) { 71 return; 72 } 73 74 mPreference.setEnabled(false); 75 mPreference.setSummary( 76 mContext.getResources().getString(R.string.convert_to_file_encryption_done)); 77 } 78 getStorageManager()79 private IStorageManager getStorageManager() { 80 try { 81 return IStorageManager.Stub.asInterface( 82 ServiceManager.getService(KEY_STORAGE_MANAGER)); 83 } catch (VerifyError e) { 84 // Used for tests since Robolectric cannot initialize this class. 85 return null; 86 } 87 } 88 }