| /* |
| * Copyright (C) 2011 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 android.app.Activity; |
| import android.app.StatusBarManager; |
| import android.content.ComponentName; |
| import android.content.Context; |
| import android.content.Intent; |
| import android.content.pm.PackageManager; |
| import android.media.AudioManager; |
| import android.os.AsyncTask; |
| import android.os.Bundle; |
| import android.os.Handler; |
| import android.os.IBinder; |
| import android.os.Message; |
| import android.os.PowerManager; |
| import android.os.RemoteException; |
| import android.os.ServiceManager; |
| import android.os.SystemProperties; |
| import android.os.UserHandle; |
| import android.os.storage.IMountService; |
| import android.provider.Settings; |
| import android.telephony.TelephonyManager; |
| import android.text.Editable; |
| import android.text.TextUtils; |
| import android.text.TextWatcher; |
| import android.util.Log; |
| import android.view.KeyEvent; |
| import android.view.MotionEvent; |
| import android.view.View; |
| import android.view.View.OnClickListener; |
| import android.view.View.OnKeyListener; |
| import android.view.View.OnTouchListener; |
| import android.view.inputmethod.EditorInfo; |
| import android.view.inputmethod.InputMethodInfo; |
| import android.view.inputmethod.InputMethodManager; |
| import android.view.inputmethod.InputMethodSubtype; |
| import android.widget.Button; |
| import android.widget.EditText; |
| import android.widget.ProgressBar; |
| import android.widget.TextView; |
| |
| import com.android.internal.telephony.ITelephony; |
| import com.android.internal.telephony.Phone; |
| import com.android.internal.telephony.PhoneConstants; |
| |
| import java.util.List; |
| |
| /** |
| * Settings screens to show the UI flows for encrypting/decrypting the device. |
| * |
| * This may be started via adb for debugging the UI layout, without having to go through |
| * encryption flows everytime. It should be noted that starting the activity in this manner |
| * is only useful for verifying UI-correctness - the behavior will not be identical. |
| * <pre> |
| * $ adb shell pm enable com.android.settings/.CryptKeeper |
| * $ adb shell am start \ |
| * -e "com.android.settings.CryptKeeper.DEBUG_FORCE_VIEW" "progress" \ |
| * -n com.android.settings/.CryptKeeper |
| * </pre> |
| */ |
| public class CryptKeeper extends Activity implements TextView.OnEditorActionListener, |
| OnKeyListener, OnTouchListener, TextWatcher { |
| private static final String TAG = "CryptKeeper"; |
| |
| private static final String DECRYPT_STATE = "trigger_restart_framework"; |
| /** Message sent to us to indicate encryption update progress. */ |
| private static final int MESSAGE_UPDATE_PROGRESS = 1; |
| /** Message sent to us to cool-down (waste user's time between password attempts) */ |
| private static final int MESSAGE_COOLDOWN = 2; |
| /** Message sent to us to indicate alerting the user that we are waiting for password entry */ |
| private static final int MESSAGE_NOTIFY = 3; |
| |
| // Constants used to control policy. |
| private static final int MAX_FAILED_ATTEMPTS = 30; |
| private static final int COOL_DOWN_ATTEMPTS = 10; |
| private static final int COOL_DOWN_INTERVAL = 30; // 30 seconds |
| |
| // Intent action for launching the Emergency Dialer activity. |
| static final String ACTION_EMERGENCY_DIAL = "com.android.phone.EmergencyDialer.DIAL"; |
| |
| // Debug Intent extras so that this Activity may be started via adb for debugging UI layouts |
| private static final String EXTRA_FORCE_VIEW = |
| "com.android.settings.CryptKeeper.DEBUG_FORCE_VIEW"; |
| private static final String FORCE_VIEW_PROGRESS = "progress"; |
| private static final String FORCE_VIEW_ERROR = "error"; |
| private static final String FORCE_VIEW_PASSWORD = "password"; |
| |
| /** When encryption is detected, this flag indicates whether or not we've checked for errors. */ |
| private boolean mValidationComplete; |
| private boolean mValidationRequested; |
| /** A flag to indicate that the volume is in a bad state (e.g. partially encrypted). */ |
| private boolean mEncryptionGoneBad; |
| /** A flag to indicate when the back event should be ignored */ |
| private boolean mIgnoreBack = false; |
| private int mCooldown; |
| PowerManager.WakeLock mWakeLock; |
| private EditText mPasswordEntry; |
| /** Number of calls to {@link #notifyUser()} to ignore before notifying. */ |
| private int mNotificationCountdown = 0; |
| |
| /** |
| * Used to propagate state through configuration changes (e.g. screen rotation) |
| */ |
| private static class NonConfigurationInstanceState { |
| final PowerManager.WakeLock wakelock; |
| |
| NonConfigurationInstanceState(PowerManager.WakeLock _wakelock) { |
| wakelock = _wakelock; |
| } |
| } |
| |
| /** |
| * Activity used to fade the screen to black after the password is entered. |
| */ |
| public static class FadeToBlack extends Activity { |
| @Override |
| public void onCreate(Bundle savedInstanceState) { |
| super.onCreate(savedInstanceState); |
| setContentView(R.layout.crypt_keeper_blank); |
| } |
| /** Ignore all back events. */ |
| @Override |
| public void onBackPressed() { |
| return; |
| } |
| } |
| |
| private class DecryptTask extends AsyncTask<String, Void, Integer> { |
| @Override |
| protected Integer doInBackground(String... params) { |
| final IMountService service = getMountService(); |
| try { |
| return service.decryptStorage(params[0]); |
| } catch (Exception e) { |
| Log.e(TAG, "Error while decrypting...", e); |
| return -1; |
| } |
| } |
| |
| @Override |
| protected void onPostExecute(Integer failedAttempts) { |
| if (failedAttempts == 0) { |
| // The password was entered successfully. Start the Blank activity |
| // so this activity animates to black before the devices starts. Note |
| // It has 1 second to complete the animation or it will be frozen |
| // until the boot animation comes back up. |
| Intent intent = new Intent(CryptKeeper.this, FadeToBlack.class); |
| finish(); |
| startActivity(intent); |
| } else if (failedAttempts == MAX_FAILED_ATTEMPTS) { |
| // Factory reset the device. |
| sendBroadcast(new Intent("android.intent.action.MASTER_CLEAR")); |
| } else if ((failedAttempts % COOL_DOWN_ATTEMPTS) == 0) { |
| mCooldown = COOL_DOWN_INTERVAL; |
| cooldown(); |
| } else { |
| final TextView status = (TextView) findViewById(R.id.status); |
| status.setText(R.string.try_again); |
| // Reenable the password entry |
| mPasswordEntry.setEnabled(true); |
| } |
| } |
| } |
| |
| private class ValidationTask extends AsyncTask<Void, Void, Boolean> { |
| @Override |
| protected Boolean doInBackground(Void... params) { |
| final IMountService service = getMountService(); |
| try { |
| Log.d(TAG, "Validating encryption state."); |
| int state = service.getEncryptionState(); |
| if (state == IMountService.ENCRYPTION_STATE_NONE) { |
| Log.w(TAG, "Unexpectedly in CryptKeeper even though there is no encryption."); |
| return true; // Unexpected, but fine, I guess... |
| } |
| return state == IMountService.ENCRYPTION_STATE_OK; |
| } catch (RemoteException e) { |
| Log.w(TAG, "Unable to get encryption state properly"); |
| return true; |
| } |
| } |
| |
| @Override |
| protected void onPostExecute(Boolean result) { |
| mValidationComplete = true; |
| if (Boolean.FALSE.equals(result)) { |
| Log.w(TAG, "Incomplete, or corrupted encryption detected. Prompting user to wipe."); |
| mEncryptionGoneBad = true; |
| } else { |
| Log.d(TAG, "Encryption state validated. Proceeding to configure UI"); |
| } |
| setupUi(); |
| } |
| } |
| |
| private final Handler mHandler = new Handler() { |
| @Override |
| public void handleMessage(Message msg) { |
| switch (msg.what) { |
| case MESSAGE_UPDATE_PROGRESS: |
| updateProgress(); |
| break; |
| |
| case MESSAGE_COOLDOWN: |
| cooldown(); |
| break; |
| |
| case MESSAGE_NOTIFY: |
| notifyUser(); |
| break; |
| } |
| } |
| }; |
| |
| private AudioManager mAudioManager; |
| |
| /** @return whether or not this Activity was started for debugging the UI only. */ |
| private boolean isDebugView() { |
| return getIntent().hasExtra(EXTRA_FORCE_VIEW); |
| } |
| |
| /** @return whether or not this Activity was started for debugging the specific UI view only. */ |
| private boolean isDebugView(String viewType /* non-nullable */) { |
| return viewType.equals(getIntent().getStringExtra(EXTRA_FORCE_VIEW)); |
| } |
| |
| /** |
| * Notify the user that we are awaiting input. Currently this sends an audio alert. |
| */ |
| private void notifyUser() { |
| if (mNotificationCountdown > 0) { |
| --mNotificationCountdown; |
| } else if (mAudioManager != null) { |
| try { |
| // Play the standard keypress sound at full volume. This should be available on |
| // every device. We cannot play a ringtone here because media services aren't |
| // available yet. A DTMF-style tone is too soft to be noticed, and might not exist |
| // on tablet devices. The idea is to alert the user that something is needed: this |
| // does not have to be pleasing. |
| mAudioManager.playSoundEffect(AudioManager.FX_KEYPRESS_STANDARD, 100); |
| } catch (Exception e) { |
| Log.w(TAG, "notifyUser: Exception while playing sound: " + e); |
| } |
| } |
| // Notify the user again in 5 seconds. |
| mHandler.removeMessages(MESSAGE_NOTIFY); |
| mHandler.sendEmptyMessageDelayed(MESSAGE_NOTIFY, 5 * 1000); |
| } |
| |
| /** |
| * Ignore back events after the user has entered the decrypt screen and while the device is |
| * encrypting. |
| */ |
| @Override |
| public void onBackPressed() { |
| if (mIgnoreBack) |
| return; |
| super.onBackPressed(); |
| } |
| |
| @Override |
| public void onCreate(Bundle savedInstanceState) { |
| super.onCreate(savedInstanceState); |
| |
| // If we are not encrypted or encrypting, get out quickly. |
| final String state = SystemProperties.get("vold.decrypt"); |
| if (!isDebugView() && ("".equals(state) || DECRYPT_STATE.equals(state))) { |
| // Disable the crypt keeper. |
| PackageManager pm = getPackageManager(); |
| ComponentName name = new ComponentName(this, CryptKeeper.class); |
| pm.setComponentEnabledSetting(name, PackageManager.COMPONENT_ENABLED_STATE_DISABLED, |
| PackageManager.DONT_KILL_APP); |
| // Typically CryptKeeper is launched as the home app. We didn't |
| // want to be running, so need to finish this activity. We can count |
| // on the activity manager re-launching the new home app upon finishing |
| // this one, since this will leave the activity stack empty. |
| // NOTE: This is really grungy. I think it would be better for the |
| // activity manager to explicitly launch the crypt keeper instead of |
| // home in the situation where we need to decrypt the device |
| finish(); |
| return; |
| } |
| |
| // Disable the status bar, but do NOT disable back because the user needs a way to go |
| // from keyboard settings and back to the password screen. |
| StatusBarManager sbm = (StatusBarManager) getSystemService(Context.STATUS_BAR_SERVICE); |
| sbm.disable(StatusBarManager.DISABLE_EXPAND |
| | StatusBarManager.DISABLE_NOTIFICATION_ICONS |
| | StatusBarManager.DISABLE_NOTIFICATION_ALERTS |
| | StatusBarManager.DISABLE_SYSTEM_INFO |
| | StatusBarManager.DISABLE_HOME |
| | StatusBarManager.DISABLE_RECENT); |
| |
| setAirplaneModeIfNecessary(); |
| mAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE); |
| // Check for (and recover) retained instance data |
| final Object lastInstance = getLastNonConfigurationInstance(); |
| if (lastInstance instanceof NonConfigurationInstanceState) { |
| NonConfigurationInstanceState retained = (NonConfigurationInstanceState) lastInstance; |
| mWakeLock = retained.wakelock; |
| Log.d(TAG, "Restoring wakelock from NonConfigurationInstanceState"); |
| } |
| } |
| |
| /** |
| * Note, we defer the state check and screen setup to onStart() because this will be |
| * re-run if the user clicks the power button (sleeping/waking the screen), and this is |
| * especially important if we were to lose the wakelock for any reason. |
| */ |
| @Override |
| public void onStart() { |
| super.onStart(); |
| setupUi(); |
| } |
| |
| /** |
| * Initializes the UI based on the current state of encryption. |
| * This is idempotent - calling repeatedly will simply re-initialize the UI. |
| */ |
| private void setupUi() { |
| if (mEncryptionGoneBad || isDebugView(FORCE_VIEW_ERROR)) { |
| setContentView(R.layout.crypt_keeper_progress); |
| showFactoryReset(); |
| return; |
| } |
| |
| final String progress = SystemProperties.get("vold.encrypt_progress"); |
| if (!"".equals(progress) || isDebugView(FORCE_VIEW_PROGRESS)) { |
| setContentView(R.layout.crypt_keeper_progress); |
| encryptionProgressInit(); |
| } else if (mValidationComplete || isDebugView(FORCE_VIEW_PASSWORD)) { |
| setContentView(R.layout.crypt_keeper_password_entry); |
| passwordEntryInit(); |
| } else if (!mValidationRequested) { |
| // We're supposed to be encrypted, but no validation has been done. |
| new ValidationTask().execute((Void[]) null); |
| mValidationRequested = true; |
| } |
| } |
| |
| @Override |
| public void onStop() { |
| super.onStop(); |
| mHandler.removeMessages(MESSAGE_COOLDOWN); |
| mHandler.removeMessages(MESSAGE_UPDATE_PROGRESS); |
| mHandler.removeMessages(MESSAGE_NOTIFY); |
| } |
| |
| /** |
| * Reconfiguring, so propagate the wakelock to the next instance. This runs between onStop() |
| * and onDestroy() and only if we are changing configuration (e.g. rotation). Also clears |
| * mWakeLock so the subsequent call to onDestroy does not release it. |
| */ |
| @Override |
| public Object onRetainNonConfigurationInstance() { |
| NonConfigurationInstanceState state = new NonConfigurationInstanceState(mWakeLock); |
| Log.d(TAG, "Handing wakelock off to NonConfigurationInstanceState"); |
| mWakeLock = null; |
| return state; |
| } |
| |
| @Override |
| public void onDestroy() { |
| super.onDestroy(); |
| |
| if (mWakeLock != null) { |
| Log.d(TAG, "Releasing and destroying wakelock"); |
| mWakeLock.release(); |
| mWakeLock = null; |
| } |
| } |
| |
| /** |
| * Start encrypting the device. |
| */ |
| private void encryptionProgressInit() { |
| // Accquire a partial wakelock to prevent the device from sleeping. Note |
| // we never release this wakelock as we will be restarted after the device |
| // is encrypted. |
| Log.d(TAG, "Encryption progress screen initializing."); |
| if (mWakeLock == null) { |
| Log.d(TAG, "Acquiring wakelock."); |
| PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE); |
| mWakeLock = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK, TAG); |
| mWakeLock.acquire(); |
| } |
| |
| ((ProgressBar) findViewById(R.id.progress_bar)).setIndeterminate(true); |
| // Ignore all back presses from now, both hard and soft keys. |
| mIgnoreBack = true; |
| // Start the first run of progress manually. This method sets up messages to occur at |
| // repeated intervals. |
| updateProgress(); |
| } |
| |
| private void showFactoryReset() { |
| // Hide the encryption-bot to make room for the "factory reset" button |
| findViewById(R.id.encroid).setVisibility(View.GONE); |
| |
| // Show the reset button, failure text, and a divider |
| final Button button = (Button) findViewById(R.id.factory_reset); |
| button.setVisibility(View.VISIBLE); |
| button.setOnClickListener(new OnClickListener() { |
| @Override |
| public void onClick(View v) { |
| // Factory reset the device. |
| sendBroadcast(new Intent("android.intent.action.MASTER_CLEAR")); |
| } |
| }); |
| |
| // Alert the user of the failure. |
| ((TextView) findViewById(R.id.title)).setText(R.string.crypt_keeper_failed_title); |
| ((TextView) findViewById(R.id.status)).setText(R.string.crypt_keeper_failed_summary); |
| |
| final View view = findViewById(R.id.bottom_divider); |
| // TODO(viki): Why would the bottom divider be missing in certain layouts? Investigate. |
| if (view != null) { |
| view.setVisibility(View.VISIBLE); |
| } |
| } |
| |
| private void updateProgress() { |
| final String state = SystemProperties.get("vold.encrypt_progress"); |
| |
| if ("error_partially_encrypted".equals(state)) { |
| showFactoryReset(); |
| return; |
| } |
| |
| int progress = 0; |
| try { |
| // Force a 50% progress state when debugging the view. |
| progress = isDebugView() ? 50 : Integer.parseInt(state); |
| } catch (Exception e) { |
| Log.w(TAG, "Error parsing progress: " + e.toString()); |
| } |
| |
| final CharSequence status = getText(R.string.crypt_keeper_setup_description); |
| Log.v(TAG, "Encryption progress: " + progress); |
| final TextView tv = (TextView) findViewById(R.id.status); |
| if (tv != null) { |
| tv.setText(TextUtils.expandTemplate(status, Integer.toString(progress))); |
| } |
| // Check the progress every 5 seconds |
| mHandler.removeMessages(MESSAGE_UPDATE_PROGRESS); |
| mHandler.sendEmptyMessageDelayed(MESSAGE_UPDATE_PROGRESS, 5000); |
| } |
| |
| /** Disable password input for a while to force the user to waste time between retries */ |
| private void cooldown() { |
| final TextView status = (TextView) findViewById(R.id.status); |
| |
| if (mCooldown <= 0) { |
| // Re-enable the password entry and back presses. |
| mPasswordEntry.setEnabled(true); |
| mIgnoreBack = false; |
| status.setText(R.string.enter_password); |
| } else { |
| CharSequence template = getText(R.string.crypt_keeper_cooldown); |
| status.setText(TextUtils.expandTemplate(template, Integer.toString(mCooldown))); |
| |
| mCooldown--; |
| mHandler.removeMessages(MESSAGE_COOLDOWN); |
| mHandler.sendEmptyMessageDelayed(MESSAGE_COOLDOWN, 1000); // Tick every second |
| } |
| } |
| |
| private void passwordEntryInit() { |
| mPasswordEntry = (EditText) findViewById(R.id.passwordEntry); |
| mPasswordEntry.setOnEditorActionListener(this); |
| mPasswordEntry.requestFocus(); |
| // Become quiet when the user interacts with the Edit text screen. |
| mPasswordEntry.setOnKeyListener(this); |
| mPasswordEntry.setOnTouchListener(this); |
| mPasswordEntry.addTextChangedListener(this); |
| |
| // Disable the Emergency call button if the device has no voice telephone capability |
| final TelephonyManager tm = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE); |
| if (!tm.isVoiceCapable()) { |
| final View emergencyCall = findViewById(R.id.emergencyCallButton); |
| if (emergencyCall != null) { |
| Log.d(TAG, "Removing the emergency Call button"); |
| emergencyCall.setVisibility(View.GONE); |
| } |
| } |
| |
| final View imeSwitcher = findViewById(R.id.switch_ime_button); |
| final InputMethodManager imm = (InputMethodManager) getSystemService( |
| Context.INPUT_METHOD_SERVICE); |
| if (imeSwitcher != null && hasMultipleEnabledIMEsOrSubtypes(imm, false)) { |
| imeSwitcher.setVisibility(View.VISIBLE); |
| imeSwitcher.setOnClickListener(new OnClickListener() { |
| @Override |
| public void onClick(View v) { |
| imm.showInputMethodPicker(); |
| } |
| }); |
| } |
| |
| // We want to keep the screen on while waiting for input. In minimal boot mode, the device |
| // is completely non-functional, and we want the user to notice the device and enter a |
| // password. |
| if (mWakeLock == null) { |
| Log.d(TAG, "Acquiring wakelock."); |
| final PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE); |
| if (pm != null) { |
| mWakeLock = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK, TAG); |
| mWakeLock.acquire(); |
| } |
| } |
| // Asynchronously throw up the IME, since there are issues with requesting it to be shown |
| // immediately. |
| mHandler.postDelayed(new Runnable() { |
| @Override public void run() { |
| imm.showSoftInputUnchecked(0, null); |
| } |
| }, 0); |
| |
| updateEmergencyCallButtonState(); |
| // Notify the user in 120 seconds that we are waiting for him to enter the password. |
| mHandler.removeMessages(MESSAGE_NOTIFY); |
| mHandler.sendEmptyMessageDelayed(MESSAGE_NOTIFY, 120 * 1000); |
| } |
| |
| /** |
| * Method adapted from com.android.inputmethod.latin.Utils |
| * |
| * @param imm The input method manager |
| * @param shouldIncludeAuxiliarySubtypes |
| * @return true if we have multiple IMEs to choose from |
| */ |
| private boolean hasMultipleEnabledIMEsOrSubtypes(InputMethodManager imm, |
| final boolean shouldIncludeAuxiliarySubtypes) { |
| final List<InputMethodInfo> enabledImis = imm.getEnabledInputMethodList(); |
| |
| // Number of the filtered IMEs |
| int filteredImisCount = 0; |
| |
| for (InputMethodInfo imi : enabledImis) { |
| // We can return true immediately after we find two or more filtered IMEs. |
| if (filteredImisCount > 1) return true; |
| final List<InputMethodSubtype> subtypes = |
| imm.getEnabledInputMethodSubtypeList(imi, true); |
| // IMEs that have no subtypes should be counted. |
| if (subtypes.isEmpty()) { |
| ++filteredImisCount; |
| continue; |
| } |
| |
| int auxCount = 0; |
| for (InputMethodSubtype subtype : subtypes) { |
| if (subtype.isAuxiliary()) { |
| ++auxCount; |
| } |
| } |
| final int nonAuxCount = subtypes.size() - auxCount; |
| |
| // IMEs that have one or more non-auxiliary subtypes should be counted. |
| // If shouldIncludeAuxiliarySubtypes is true, IMEs that have two or more auxiliary |
| // subtypes should be counted as well. |
| if (nonAuxCount > 0 || (shouldIncludeAuxiliarySubtypes && auxCount > 1)) { |
| ++filteredImisCount; |
| continue; |
| } |
| } |
| |
| return filteredImisCount > 1 |
| // imm.getEnabledInputMethodSubtypeList(null, false) will return the current IME's enabled |
| // input method subtype (The current IME should be LatinIME.) |
| || imm.getEnabledInputMethodSubtypeList(null, false).size() > 1; |
| } |
| |
| private IMountService getMountService() { |
| final IBinder service = ServiceManager.getService("mount"); |
| if (service != null) { |
| return IMountService.Stub.asInterface(service); |
| } |
| return null; |
| } |
| |
| @Override |
| public boolean onEditorAction(TextView v, int actionId, KeyEvent event) { |
| if (actionId == EditorInfo.IME_NULL || actionId == EditorInfo.IME_ACTION_DONE) { |
| // Get the password |
| final String password = v.getText().toString(); |
| |
| if (TextUtils.isEmpty(password)) { |
| return true; |
| } |
| |
| // Now that we have the password clear the password field. |
| v.setText(null); |
| |
| // Disable the password entry and back keypress while checking the password. These |
| // we either be re-enabled if the password was wrong or after the cooldown period. |
| mPasswordEntry.setEnabled(false); |
| mIgnoreBack = true; |
| |
| Log.d(TAG, "Attempting to send command to decrypt"); |
| new DecryptTask().execute(password); |
| |
| return true; |
| } |
| return false; |
| } |
| |
| /** |
| * Set airplane mode on the device if it isn't an LTE device. |
| * Full story: In minimal boot mode, we cannot save any state. In particular, we cannot save |
| * any incoming SMS's. So SMSs that are received here will be silently dropped to the floor. |
| * That is bad. Also, we cannot receive any telephone calls in this state. So to avoid |
| * both these problems, we turn the radio off. However, on certain networks turning on and |
| * off the radio takes a long time. In such cases, we are better off leaving the radio |
| * running so the latency of an E911 call is short. |
| * The behavior after this is: |
| * 1. Emergency dialing: the emergency dialer has logic to force the device out of |
| * airplane mode and restart the radio. |
| * 2. Full boot: we read the persistent settings from the previous boot and restore the |
| * radio to whatever it was before it restarted. This also happens when rebooting a |
| * phone that has no encryption. |
| */ |
| private final void setAirplaneModeIfNecessary() { |
| final boolean isLteDevice = |
| TelephonyManager.getDefault().getLteOnCdmaMode() == PhoneConstants.LTE_ON_CDMA_TRUE; |
| if (!isLteDevice) { |
| Log.d(TAG, "Going into airplane mode."); |
| Settings.Global.putInt(getContentResolver(), Settings.Global.AIRPLANE_MODE_ON, 1); |
| final Intent intent = new Intent(Intent.ACTION_AIRPLANE_MODE_CHANGED); |
| intent.putExtra("state", true); |
| sendBroadcastAsUser(intent, UserHandle.ALL); |
| } |
| } |
| |
| /** |
| * Code to update the state of, and handle clicks from, the "Emergency call" button. |
| * |
| * This code is mostly duplicated from the corresponding code in |
| * LockPatternUtils and LockPatternKeyguardView under frameworks/base. |
| */ |
| private void updateEmergencyCallButtonState() { |
| final Button emergencyCall = (Button) findViewById(R.id.emergencyCallButton); |
| // The button isn't present at all in some configurations. |
| if (emergencyCall == null) |
| return; |
| |
| if (isEmergencyCallCapable()) { |
| emergencyCall.setVisibility(View.VISIBLE); |
| emergencyCall.setOnClickListener(new View.OnClickListener() { |
| @Override |
| |
| public void onClick(View v) { |
| takeEmergencyCallAction(); |
| } |
| }); |
| } else { |
| emergencyCall.setVisibility(View.GONE); |
| return; |
| } |
| |
| final int newState = TelephonyManager.getDefault().getCallState(); |
| int textId; |
| if (newState == TelephonyManager.CALL_STATE_OFFHOOK) { |
| // Show "return to call" text and show phone icon |
| textId = R.string.cryptkeeper_return_to_call; |
| final int phoneCallIcon = R.drawable.stat_sys_phone_call; |
| emergencyCall.setCompoundDrawablesWithIntrinsicBounds(phoneCallIcon, 0, 0, 0); |
| } else { |
| textId = R.string.cryptkeeper_emergency_call; |
| final int emergencyIcon = R.drawable.ic_emergency; |
| emergencyCall.setCompoundDrawablesWithIntrinsicBounds(emergencyIcon, 0, 0, 0); |
| } |
| emergencyCall.setText(textId); |
| } |
| |
| private boolean isEmergencyCallCapable() { |
| return getResources().getBoolean(com.android.internal.R.bool.config_voice_capable); |
| } |
| |
| private void takeEmergencyCallAction() { |
| if (TelephonyManager.getDefault().getCallState() == TelephonyManager.CALL_STATE_OFFHOOK) { |
| resumeCall(); |
| } else { |
| launchEmergencyDialer(); |
| } |
| } |
| |
| private void resumeCall() { |
| final ITelephony phone = ITelephony.Stub.asInterface(ServiceManager.checkService("phone")); |
| if (phone != null) { |
| try { |
| phone.showCallScreen(); |
| } catch (RemoteException e) { |
| Log.e(TAG, "Error calling ITelephony service: " + e); |
| } |
| } |
| } |
| |
| private void launchEmergencyDialer() { |
| final Intent intent = new Intent(ACTION_EMERGENCY_DIAL); |
| intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK |
| | Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS); |
| startActivity(intent); |
| } |
| |
| /** |
| * Listen to key events so we can disable sounds when we get a keyinput in EditText. |
| */ |
| private void delayAudioNotification() { |
| mNotificationCountdown = 20; |
| } |
| |
| @Override |
| public boolean onKey(View v, int keyCode, KeyEvent event) { |
| delayAudioNotification(); |
| return false; |
| } |
| |
| @Override |
| public boolean onTouch(View v, MotionEvent event) { |
| delayAudioNotification(); |
| return false; |
| } |
| |
| @Override |
| public void beforeTextChanged(CharSequence s, int start, int count, int after) { |
| return; |
| } |
| |
| @Override |
| public void onTextChanged(CharSequence s, int start, int before, int count) { |
| delayAudioNotification(); |
| } |
| |
| @Override |
| public void afterTextChanged(Editable s) { |
| return; |
| } |
| } |
