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