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/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.settings;
import com.android.internal.widget.LockPatternUtils;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Fragment;
import android.app.admin.DevicePolicyManager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.res.Resources;
import android.os.BatteryManager;
import android.os.Bundle;
import android.preference.Preference;
import android.preference.PreferenceActivity;
import android.text.TextUtils;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
public class CryptKeeperSettings extends Fragment {
private static final String TAG = "CryptKeeper";
private static final int KEYGUARD_REQUEST = 55;
// This is the minimum acceptable password quality. If the current password quality is
// lower than this, encryption should not be activated.
static final int MIN_PASSWORD_QUALITY = DevicePolicyManager.PASSWORD_QUALITY_NUMERIC;
// Minimum battery charge level (in percent) to launch encryption. If the battery charge is
// lower than this, encryption should not be activated.
private static final int MIN_BATTERY_LEVEL = 80;
private View mContentView;
private Button mInitiateButton;
private View mPowerWarning;
private View mBatteryWarning;
private IntentFilter mIntentFilter;
private BroadcastReceiver mIntentReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (action.equals(Intent.ACTION_BATTERY_CHANGED)) {
int level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, 0);
int plugged = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, 0);
int invalidCharger = intent.getIntExtra(BatteryManager.EXTRA_INVALID_CHARGER, 0);
boolean levelOk = level >= MIN_BATTERY_LEVEL;
boolean pluggedOk =
(plugged == BatteryManager.BATTERY_PLUGGED_AC ||
plugged == BatteryManager.BATTERY_PLUGGED_USB) &&
invalidCharger == 0;
// Update UI elements based on power/battery status
mInitiateButton.setEnabled(levelOk && pluggedOk);
mPowerWarning.setVisibility(pluggedOk ? View.GONE : View.VISIBLE );
mBatteryWarning.setVisibility(levelOk ? View.GONE : View.VISIBLE);
}
}
};
/**
* If the user clicks to begin the reset sequence, we next require a
* keyguard confirmation if the user has currently enabled one. If there
* is no keyguard available, we prompt the user to set a password.
*/
private Button.OnClickListener mInitiateListener = new Button.OnClickListener() {
public void onClick(View v) {
if (!runKeyguardConfirmation(KEYGUARD_REQUEST)) {
// TODO replace (or follow) this dialog with an explicit launch into password UI
new AlertDialog.Builder(getActivity())
.setTitle(R.string.crypt_keeper_dialog_need_password_title)
.setIconAttribute(android.R.attr.alertDialogIcon)
.setMessage(R.string.crypt_keeper_dialog_need_password_message)
.setPositiveButton(android.R.string.ok, null)
.create()
.show();
}
}
};
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedState) {
mContentView = inflater.inflate(R.layout.crypt_keeper_settings, null);
mIntentFilter = new IntentFilter();
mIntentFilter.addAction(Intent.ACTION_BATTERY_CHANGED);
mInitiateButton = (Button) mContentView.findViewById(R.id.initiate_encrypt);
mInitiateButton.setOnClickListener(mInitiateListener);
mInitiateButton.setEnabled(false);
mPowerWarning = mContentView.findViewById(R.id.warning_unplugged);
mBatteryWarning = mContentView.findViewById(R.id.warning_low_charge);
return mContentView;
}
@Override
public void onResume() {
super.onResume();
getActivity().registerReceiver(mIntentReceiver, mIntentFilter);
}
@Override
public void onPause() {
super.onPause();
getActivity().unregisterReceiver(mIntentReceiver);
}
/**
* If encryption is already started, and this launched via a "start encryption" intent,
* then exit immediately - it's already up and running, so there's no point in "starting" it.
*/
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
Activity activity = getActivity();
Intent intent = activity.getIntent();
if (DevicePolicyManager.ACTION_START_ENCRYPTION.equals(intent.getAction())) {
DevicePolicyManager dpm = (DevicePolicyManager)
activity.getSystemService(Context.DEVICE_POLICY_SERVICE);
if (dpm != null) {
int status = dpm.getStorageEncryptionStatus();
if (status != DevicePolicyManager.ENCRYPTION_STATUS_INACTIVE) {
// There is nothing to do here, so simply finish() (which returns to caller)
activity.finish();
}
}
}
}
/**
* Keyguard validation is run using the standard {@link ConfirmLockPattern}
* component as a subactivity
* @param request the request code to be returned once confirmation finishes
* @return true if confirmation launched
*/
private boolean runKeyguardConfirmation(int request) {
// 1. Confirm that we have a sufficient PIN/Password to continue
LockPatternUtils lockPatternUtils = new LockPatternUtils(getActivity());
int quality = lockPatternUtils.getActivePasswordQuality();
if (quality == DevicePolicyManager.PASSWORD_QUALITY_BIOMETRIC_WEAK
&& lockPatternUtils.isLockPasswordEnabled()) {
// Use the alternate as the quality. We expect this to be
// PASSWORD_QUALITY_SOMETHING(pattern) or PASSWORD_QUALITY_NUMERIC(PIN).
quality = lockPatternUtils.getKeyguardStoredPasswordQuality();
}
if (quality < MIN_PASSWORD_QUALITY) {
return false;
}
// 2. Ask the user to confirm the current PIN/Password
Resources res = getActivity().getResources();
return new ChooseLockSettingsHelper(getActivity(), this)
.launchConfirmationActivity(request,
res.getText(R.string.master_clear_gesture_prompt),
res.getText(R.string.master_clear_gesture_explanation));
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode != KEYGUARD_REQUEST) {
return;
}
// If the user entered a valid keyguard trace, present the final
// confirmation prompt; otherwise, go back to the initial state.
if (resultCode == Activity.RESULT_OK && data != null) {
String password = data.getStringExtra(ChooseLockSettingsHelper.EXTRA_KEY_PASSWORD);
if (!TextUtils.isEmpty(password)) {
showFinalConfirmation(password);
}
}
}
private void showFinalConfirmation(String password) {
Preference preference = new Preference(getActivity());
preference.setFragment(CryptKeeperConfirm.class.getName());
preference.setTitle(R.string.crypt_keeper_confirm_title);
preference.getExtras().putString("password", password);
((PreferenceActivity) getActivity()).onPreferenceStartFragment(null, preference);
}
}
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