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