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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 com.android.internal.widget.LockPatternUtils;
     20 
     21 import android.app.Activity;
     22 import android.app.AlertDialog;
     23 import android.app.Fragment;
     24 import android.app.admin.DevicePolicyManager;
     25 import android.content.BroadcastReceiver;
     26 import android.content.Context;
     27 import android.content.Intent;
     28 import android.content.IntentFilter;
     29 import android.content.res.Resources;
     30 import android.os.BatteryManager;
     31 import android.os.Bundle;
     32 import android.os.storage.StorageManager;
     33 import android.preference.Preference;
     34 import android.text.TextUtils;
     35 import android.view.LayoutInflater;
     36 import android.view.View;
     37 import android.view.ViewGroup;
     38 import android.widget.Button;
     39 
     40 public class CryptKeeperSettings extends Fragment {
     41     private static final String TAG = "CryptKeeper";
     42 
     43     private static final int KEYGUARD_REQUEST = 55;
     44 
     45     // Minimum battery charge level (in percent) to launch encryption.  If the battery charge is
     46     // lower than this, encryption should not be activated.
     47     private static final int MIN_BATTERY_LEVEL = 80;
     48 
     49     private View mContentView;
     50     private Button mInitiateButton;
     51     private View mPowerWarning;
     52     private View mBatteryWarning;
     53     private IntentFilter mIntentFilter;
     54 
     55     private BroadcastReceiver mIntentReceiver = new BroadcastReceiver() {
     56         @Override
     57         public void onReceive(Context context, Intent intent) {
     58             String action = intent.getAction();
     59             if (action.equals(Intent.ACTION_BATTERY_CHANGED)) {
     60                 final int level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, 0);
     61                 final int plugged = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, 0);
     62                 final int invalidCharger = intent.getIntExtra(
     63                     BatteryManager.EXTRA_INVALID_CHARGER, 0);
     64 
     65                 final boolean levelOk = level >= MIN_BATTERY_LEVEL;
     66                 final boolean pluggedOk =
     67                     ((plugged & BatteryManager.BATTERY_PLUGGED_ANY) != 0) &&
     68                      invalidCharger == 0;
     69 
     70                 // Update UI elements based on power/battery status
     71                 mInitiateButton.setEnabled(levelOk && pluggedOk);
     72                 mPowerWarning.setVisibility(pluggedOk ? View.GONE : View.VISIBLE );
     73                 mBatteryWarning.setVisibility(levelOk ? View.GONE : View.VISIBLE);
     74             }
     75         }
     76     };
     77 
     78     /**
     79      * If the user clicks to begin the reset sequence, we next require a
     80      * keyguard confirmation if the user has currently enabled one.  If there
     81      * is no keyguard available, we prompt the user to set a password.
     82      */
     83     private Button.OnClickListener mInitiateListener = new Button.OnClickListener() {
     84 
     85         public void onClick(View v) {
     86             if (!runKeyguardConfirmation(KEYGUARD_REQUEST)) {
     87                 // TODO replace (or follow) this dialog with an explicit launch into password UI
     88                 new AlertDialog.Builder(getActivity())
     89                     .setTitle(R.string.crypt_keeper_dialog_need_password_title)
     90                     .setMessage(R.string.crypt_keeper_dialog_need_password_message)
     91                     .setPositiveButton(android.R.string.ok, null)
     92                     .create()
     93                     .show();
     94             }
     95         }
     96     };
     97 
     98     @Override
     99     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedState) {
    100         mContentView = inflater.inflate(R.layout.crypt_keeper_settings, null);
    101 
    102         mIntentFilter = new IntentFilter();
    103         mIntentFilter.addAction(Intent.ACTION_BATTERY_CHANGED);
    104 
    105         mInitiateButton = (Button) mContentView.findViewById(R.id.initiate_encrypt);
    106         mInitiateButton.setOnClickListener(mInitiateListener);
    107         mInitiateButton.setEnabled(false);
    108 
    109         mPowerWarning = mContentView.findViewById(R.id.warning_unplugged);
    110         mBatteryWarning = mContentView.findViewById(R.id.warning_low_charge);
    111 
    112         return mContentView;
    113     }
    114 
    115     @Override
    116     public void onResume() {
    117         super.onResume();
    118         getActivity().registerReceiver(mIntentReceiver, mIntentFilter);
    119     }
    120 
    121     @Override
    122     public void onPause() {
    123         super.onPause();
    124         getActivity().unregisterReceiver(mIntentReceiver);
    125     }
    126 
    127     /**
    128      * If encryption is already started, and this launched via a "start encryption" intent,
    129      * then exit immediately - it's already up and running, so there's no point in "starting" it.
    130      */
    131     @Override
    132     public void onActivityCreated(Bundle savedInstanceState) {
    133         super.onActivityCreated(savedInstanceState);
    134         Activity activity = getActivity();
    135         Intent intent = activity.getIntent();
    136         if (DevicePolicyManager.ACTION_START_ENCRYPTION.equals(intent.getAction())) {
    137             DevicePolicyManager dpm = (DevicePolicyManager)
    138                     activity.getSystemService(Context.DEVICE_POLICY_SERVICE);
    139             if (dpm != null) {
    140                 int status = dpm.getStorageEncryptionStatus();
    141                 if (status != DevicePolicyManager.ENCRYPTION_STATUS_INACTIVE) {
    142                     // There is nothing to do here, so simply finish() (which returns to caller)
    143                     activity.finish();
    144                 }
    145             }
    146         }
    147     }
    148 
    149     /**
    150      * Keyguard validation is run using the standard {@link ConfirmLockPattern}
    151      * component as a subactivity
    152      * @param request the request code to be returned once confirmation finishes
    153      * @return true if confirmation launched
    154      */
    155     private boolean runKeyguardConfirmation(int request) {
    156         Resources res = getActivity().getResources();
    157         ChooseLockSettingsHelper helper = new ChooseLockSettingsHelper(getActivity(), this);
    158 
    159         if (helper.utils().getKeyguardStoredPasswordQuality()
    160                 == DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED) {
    161             showFinalConfirmation(StorageManager.CRYPT_TYPE_DEFAULT, "");
    162             return true;
    163         }
    164 
    165         return helper.launchConfirmationActivity(request,
    166                 res.getText(R.string.master_clear_gesture_prompt),
    167                 res.getText(R.string.crypt_keeper_confirm_encrypt),
    168                 true);
    169     }
    170 
    171     @Override
    172     public void onActivityResult(int requestCode, int resultCode, Intent data) {
    173         super.onActivityResult(requestCode, resultCode, data);
    174 
    175         if (requestCode != KEYGUARD_REQUEST) {
    176             return;
    177         }
    178 
    179         // If the user entered a valid keyguard trace, present the final
    180         // confirmation prompt; otherwise, go back to the initial state.
    181         if (resultCode == Activity.RESULT_OK && data != null) {
    182             int type = data.getIntExtra(ChooseLockSettingsHelper.EXTRA_KEY_TYPE, -1);
    183             String password = data.getStringExtra(ChooseLockSettingsHelper.EXTRA_KEY_PASSWORD);
    184             if (!TextUtils.isEmpty(password)) {
    185                 showFinalConfirmation(type, password);
    186             }
    187         }
    188     }
    189 
    190     private void showFinalConfirmation(int type, String password) {
    191         Preference preference = new Preference(getActivity());
    192         preference.setFragment(CryptKeeperConfirm.class.getName());
    193         preference.setTitle(R.string.crypt_keeper_confirm_title);
    194         preference.getExtras().putInt("type", type);
    195         preference.getExtras().putString("password", password);
    196         ((SettingsActivity) getActivity()).onPreferenceStartFragment(null, preference);
    197     }
    198 }
    199