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
17package com.android.settings;
18
19import android.accounts.Account;
20import android.accounts.AccountManager;
21import android.accounts.AuthenticatorDescription;
22import android.app.Activity;
23import android.app.Fragment;
24import android.content.Context;
25import android.content.Intent;
26import android.content.pm.PackageManager;
27import android.content.res.Resources;
28import android.graphics.drawable.Drawable;
29import android.os.Bundle;
30import android.os.Environment;
31import android.os.Process;
32import android.os.SystemProperties;
33import android.os.UserManager;
34import android.preference.Preference;
35import android.util.Log;
36import android.view.LayoutInflater;
37import android.view.View;
38import android.view.ViewGroup;
39import android.widget.Button;
40import android.widget.CheckBox;
41import android.widget.LinearLayout;
42import 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 */
54public 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