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      1 /*
      2  * Copyright (C) 2008 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;
     18 
     19 import android.accounts.Account;
     20 import android.accounts.AccountManager;
     21 import android.accounts.AuthenticatorDescription;
     22 import android.app.Activity;
     23 import android.app.Fragment;
     24 import android.content.Context;
     25 import android.content.Intent;
     26 import android.content.pm.PackageManager;
     27 import android.content.res.Resources;
     28 import android.graphics.drawable.Drawable;
     29 import android.os.Bundle;
     30 import android.os.Environment;
     31 import android.os.Process;
     32 import android.os.SystemProperties;
     33 import android.os.UserManager;
     34 import android.preference.Preference;
     35 import android.util.Log;
     36 import android.view.LayoutInflater;
     37 import android.view.View;
     38 import android.view.ViewGroup;
     39 import android.widget.Button;
     40 import android.widget.CheckBox;
     41 import android.widget.LinearLayout;
     42 import android.widget.TextView;
     43 
     44 /**
     45  * Confirm and execute a reset of the device to a clean "just out of the box"
     46  * state.  Multiple confirmations are required: first, a general "are you sure
     47  * you want to do this?" prompt, followed by a keyguard pattern trace if the user
     48  * has defined one, followed by a final strongly-worded "THIS WILL ERASE EVERYTHING
     49  * ON THE PHONE" prompt.  If at any time the phone is allowed to go to sleep, is
     50  * locked, et cetera, then the confirmation sequence is abandoned.
     51  *
     52  * This is the initial screen.
     53  */
     54 public class MasterClear extends Fragment {
     55     private static final String TAG = "MasterClear";
     56 
     57     private static final int KEYGUARD_REQUEST = 55;
     58 
     59     static final String ERASE_EXTERNAL_EXTRA = "erase_sd";
     60 
     61     private View mContentView;
     62     private Button mInitiateButton;
     63     private View mExternalStorageContainer;
     64     private CheckBox mExternalStorage;
     65 
     66     /**
     67      * Keyguard validation is run using the standard {@link ConfirmLockPattern}
     68      * component as a subactivity
     69      * @param request the request code to be returned once confirmation finishes
     70      * @return true if confirmation launched
     71      */
     72     private boolean runKeyguardConfirmation(int request) {
     73         Resources res = getActivity().getResources();
     74         return new ChooseLockSettingsHelper(getActivity(), this)
     75                 .launchConfirmationActivity(request,
     76                         res.getText(R.string.master_clear_gesture_prompt),
     77                         res.getText(R.string.master_clear_gesture_explanation));
     78     }
     79 
     80     @Override
     81     public void onActivityResult(int requestCode, int resultCode, Intent data) {
     82         super.onActivityResult(requestCode, resultCode, data);
     83 
     84         if (requestCode != KEYGUARD_REQUEST) {
     85             return;
     86         }
     87 
     88         // If the user entered a valid keyguard trace, present the final
     89         // confirmation prompt; otherwise, go back to the initial state.
     90         if (resultCode == Activity.RESULT_OK) {
     91             showFinalConfirmation();
     92         } else {
     93             establishInitialState();
     94         }
     95     }
     96 
     97     private void showFinalConfirmation() {
     98         Preference preference = new Preference(getActivity());
     99         preference.setFragment(MasterClearConfirm.class.getName());
    100         preference.setTitle(R.string.master_clear_confirm_title);
    101         preference.getExtras().putBoolean(ERASE_EXTERNAL_EXTRA, mExternalStorage.isChecked());
    102         ((SettingsActivity) getActivity()).onPreferenceStartFragment(null, preference);
    103     }
    104 
    105     /**
    106      * If the user clicks to begin the reset sequence, we next require a
    107      * keyguard confirmation if the user has currently enabled one.  If there
    108      * is no keyguard available, we simply go to the final confirmation prompt.
    109      */
    110     private final Button.OnClickListener mInitiateListener = new Button.OnClickListener() {
    111 
    112         public void onClick(View v) {
    113             if (!runKeyguardConfirmation(KEYGUARD_REQUEST)) {
    114                 showFinalConfirmation();
    115             }
    116         }
    117     };
    118 
    119     /**
    120      * In its initial state, the activity presents a button for the user to
    121      * click in order to initiate a confirmation sequence.  This method is
    122      * called from various other points in the code to reset the activity to
    123      * this base state.
    124      *
    125      * <p>Reinflating views from resources is expensive and prevents us from
    126      * caching widget pointers, so we use a single-inflate pattern:  we lazy-
    127      * inflate each view, caching all of the widget pointers we'll need at the
    128      * time, then simply reuse the inflated views directly whenever we need
    129      * to change contents.
    130      */
    131     private void establishInitialState() {
    132         mInitiateButton = (Button) mContentView.findViewById(R.id.initiate_master_clear);
    133         mInitiateButton.setOnClickListener(mInitiateListener);
    134         mExternalStorageContainer = mContentView.findViewById(R.id.erase_external_container);
    135         mExternalStorage = (CheckBox) mContentView.findViewById(R.id.erase_external);
    136 
    137         /*
    138          * If the external storage is emulated, it will be erased with a factory
    139          * reset at any rate. There is no need to have a separate option until
    140          * we have a factory reset that only erases some directories and not
    141          * others. Likewise, if it's non-removable storage, it could potentially have been
    142          * encrypted, and will also need to be wiped.
    143          */
    144         boolean isExtStorageEmulated = Environment.isExternalStorageEmulated();
    145         if (isExtStorageEmulated
    146                 || (!Environment.isExternalStorageRemovable() && isExtStorageEncrypted())) {
    147             mExternalStorageContainer.setVisibility(View.GONE);
    148 
    149             final View externalOption = mContentView.findViewById(R.id.erase_external_option_text);
    150             externalOption.setVisibility(View.GONE);
    151 
    152             final View externalAlsoErased = mContentView.findViewById(R.id.also_erases_external);
    153             externalAlsoErased.setVisibility(View.VISIBLE);
    154 
    155             // If it's not emulated, it is on a separate partition but it means we're doing
    156             // a force wipe due to encryption.
    157             mExternalStorage.setChecked(!isExtStorageEmulated);
    158         } else {
    159             mExternalStorageContainer.setOnClickListener(new View.OnClickListener() {
    160 
    161                 @Override
    162                 public void onClick(View v) {
    163                     mExternalStorage.toggle();
    164                 }
    165             });
    166         }
    167 
    168         loadAccountList();
    169     }
    170 
    171     private boolean isExtStorageEncrypted() {
    172         String state = SystemProperties.get("vold.decrypt");
    173         return !"".equals(state);
    174     }
    175 
    176     private void loadAccountList() {
    177         View accountsLabel = mContentView.findViewById(R.id.accounts_label);
    178         LinearLayout contents = (LinearLayout)mContentView.findViewById(R.id.accounts);
    179         contents.removeAllViews();
    180 
    181         Context context = getActivity();
    182 
    183         AccountManager mgr = AccountManager.get(context);
    184         Account[] accounts = mgr.getAccounts();
    185         final int N = accounts.length;
    186         if (N == 0) {
    187             accountsLabel.setVisibility(View.GONE);
    188             contents.setVisibility(View.GONE);
    189             return;
    190         }
    191 
    192         LayoutInflater inflater = (LayoutInflater)context.getSystemService(
    193                 Context.LAYOUT_INFLATER_SERVICE);
    194 
    195         AuthenticatorDescription[] descs = AccountManager.get(context).getAuthenticatorTypes();
    196         final int M = descs.length;
    197 
    198         for (int i=0; i<N; i++) {
    199             Account account = accounts[i];
    200             AuthenticatorDescription desc = null;
    201             for (int j=0; j<M; j++) {
    202                 if (account.type.equals(descs[j].type)) {
    203                     desc = descs[j];
    204                     break;
    205                 }
    206             }
    207             if (desc == null) {
    208                 Log.w(TAG, "No descriptor for account name=" + account.name
    209                         + " type=" + account.type);
    210                 continue;
    211             }
    212             Drawable icon = null;
    213             try {
    214                 if (desc.iconId != 0) {
    215                     Context authContext = context.createPackageContext(desc.packageName, 0);
    216                     icon = authContext.getResources().getDrawable(desc.iconId);
    217                 }
    218             } catch (PackageManager.NameNotFoundException e) {
    219                 Log.w(TAG, "No icon for account type " + desc.type);
    220             }
    221 
    222             TextView child = (TextView)inflater.inflate(R.layout.master_clear_account,
    223                     contents, false);
    224             child.setText(account.name);
    225             if (icon != null) {
    226                 child.setCompoundDrawablesWithIntrinsicBounds(icon, null, null, null);
    227             }
    228             contents.addView(child);
    229         }
    230 
    231         accountsLabel.setVisibility(View.VISIBLE);
    232         contents.setVisibility(View.VISIBLE);
    233     }
    234 
    235     @Override
    236     public View onCreateView(LayoutInflater inflater, ViewGroup container,
    237             Bundle savedInstanceState) {
    238         if (!Process.myUserHandle().isOwner()
    239                 || UserManager.get(getActivity()).hasUserRestriction(
    240                 UserManager.DISALLOW_FACTORY_RESET)) {
    241             return inflater.inflate(R.layout.master_clear_disallowed_screen, null);
    242         }
    243 
    244         mContentView = inflater.inflate(R.layout.master_clear, null);
    245 
    246         establishInitialState();
    247         return mContentView;
    248     }
    249 }
    250