src/com/android/cellbroadcastreceiver/CellBroadcastAlertDialog.java - platform/packages/apps/CellBroadcastReceiver - Git at Google

 /*
  * Copyright (C) 2016 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.cellbroadcastreceiver;

 import android.app.Activity;
 import android.app.KeyguardManager;
 import android.app.NotificationManager;
 import android.content.Context;
 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.content.res.Resources;
 import android.graphics.drawable.Drawable;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.Message;
 import android.os.PowerManager;
 import android.preference.PreferenceManager;
 import android.provider.Telephony;
 import android.telephony.CellBroadcastMessage;
 import android.telephony.SmsCbCmasInfo;
 import android.util.Log;
 import android.view.KeyEvent;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.Window;
 import android.view.WindowManager;
 import android.widget.Button;
 import android.widget.ImageView;
 import android.widget.TextView;

 import java.util.ArrayList;
 import java.util.concurrent.atomic.AtomicInteger;

 /**
  * Custom alert dialog with optional flashing warning icon.
  * Alert audio and text-to-speech handled by {@link CellBroadcastAlertAudio}.
  */
 public class CellBroadcastAlertDialog extends Activity {

     private static final String TAG = "CellBroadcastAlertDialog";

     /** Intent extra for non-emergency alerts sent when user selects the notification. */
     static final String FROM_NOTIFICATION_EXTRA = "from_notification";

     // Intent extra to identify if notification was sent while trying to move away from the dialog
     //  without acknowleding the dialog
     static final String FROM_SAVE_STATE_NOTIFICATION_EXTRA = "from_save_state_notification";

     /** List of cell broadcast messages to display (oldest to newest). */
     protected ArrayList<CellBroadcastMessage> mMessageList;

     /** Whether a CMAS alert other than Presidential Alert was displayed. */
     private boolean mShowOptOutDialog;

     /** Length of time for the warning icon to be visible. */
     private static final int WARNING_ICON_ON_DURATION_MSEC = 800;

     /** Length of time for the warning icon to be off. */
     private static final int WARNING_ICON_OFF_DURATION_MSEC = 800;

     /** Length of time to keep the screen turned on. */
     private static final int KEEP_SCREEN_ON_DURATION_MSEC = 60000;

     /** Animation handler for the flashing warning icon (emergency alerts only). */
     private final AnimationHandler mAnimationHandler = new AnimationHandler();

     /** Handler to add and remove screen on flags for emergency alerts. */
     private final ScreenOffHandler mScreenOffHandler = new ScreenOffHandler();

     /**
      * Animation handler for the flashing warning icon (emergency alerts only).
      */
     private class AnimationHandler extends Handler {
         /** Latest {@code message.what} value for detecting old messages. */
         private final AtomicInteger mCount = new AtomicInteger();

         /** Warning icon state: visible == true, hidden == false. */
         private boolean mWarningIconVisible;

         /** The warning icon Drawable. */
         private Drawable mWarningIcon;

         /** The View containing the warning icon. */
         private ImageView mWarningIconView;

         /** Package local constructor (called from outer class). */
         AnimationHandler() {}

         /** Start the warning icon animation. */
         void startIconAnimation() {
             if (!initDrawableAndImageView()) {
                 return;     // init failure
             }
             mWarningIconVisible = true;
             mWarningIconView.setVisibility(View.VISIBLE);
             updateIconState();
             queueAnimateMessage();
         }

         /** Stop the warning icon animation. */
         void stopIconAnimation() {
             // Increment the counter so the handler will ignore the next message.
             mCount.incrementAndGet();
             if (mWarningIconView != null) {
                 mWarningIconView.setVisibility(View.GONE);
             }
         }

         /** Update the visibility of the warning icon. */
         private void updateIconState() {
             mWarningIconView.setImageAlpha(mWarningIconVisible ? 255 : 0);
             mWarningIconView.invalidateDrawable(mWarningIcon);
         }

         /** Queue a message to animate the warning icon. */
         private void queueAnimateMessage() {
             int msgWhat = mCount.incrementAndGet();
             sendEmptyMessageDelayed(msgWhat, mWarningIconVisible ? WARNING_ICON_ON_DURATION_MSEC
                     : WARNING_ICON_OFF_DURATION_MSEC);
         }

         @Override
         public void handleMessage(Message msg) {
             if (msg.what == mCount.get()) {
                 mWarningIconVisible = !mWarningIconVisible;
                 updateIconState();
                 queueAnimateMessage();
             }
         }

         /**
          * Initialize the Drawable and ImageView fields.
          * @return true if successful; false if any field failed to initialize
          */
         private boolean initDrawableAndImageView() {
             if (mWarningIcon == null) {
                 try {
                     mWarningIcon = getResources().getDrawable(R.drawable.ic_warning_large);
                 } catch (Resources.NotFoundException e) {
                     Log.e(TAG, "warning icon resource not found", e);
                     return false;
                 }
             }
             if (mWarningIconView == null) {
                 mWarningIconView = (ImageView) findViewById(R.id.icon);
                 if (mWarningIconView != null) {
                     mWarningIconView.setImageDrawable(mWarningIcon);
                 } else {
                     Log.e(TAG, "failed to get ImageView for warning icon");
                     return false;
                 }
             }
             return true;
         }
     }

     /**
      * Handler to add {@code FLAG_KEEP_SCREEN_ON} for emergency alerts. After a short delay,
      * remove the flag so the screen can turn off to conserve the battery.
      */
     private class ScreenOffHandler extends Handler {
         /** Latest {@code message.what} value for detecting old messages. */
         private final AtomicInteger mCount = new AtomicInteger();

         /** Package local constructor (called from outer class). */
         ScreenOffHandler() {}

         /** Add screen on window flags and queue a delayed message to remove them later. */
         void startScreenOnTimer() {
             addWindowFlags();
             int msgWhat = mCount.incrementAndGet();
             removeMessages(msgWhat - 1);    // Remove previous message, if any.
             sendEmptyMessageDelayed(msgWhat, KEEP_SCREEN_ON_DURATION_MSEC);
             Log.d(TAG, "added FLAG_KEEP_SCREEN_ON, queued screen off message id " + msgWhat);
         }

         /** Remove the screen on window flags and any queued screen off message. */
         void stopScreenOnTimer() {
             removeMessages(mCount.get());
             clearWindowFlags();
         }

         /** Set the screen on window flags. */
         private void addWindowFlags() {
             getWindow().addFlags(WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON
                     | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
         }

         /** Clear the screen on window flags. */
         private void clearWindowFlags() {
             getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON
                     | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
         }

         @Override
         public void handleMessage(Message msg) {
             int msgWhat = msg.what;
             if (msgWhat == mCount.get()) {
                 clearWindowFlags();
                 Log.d(TAG, "removed FLAG_KEEP_SCREEN_ON with id " + msgWhat);
             } else {
                 Log.e(TAG, "discarding screen off message with id " + msgWhat);
             }
         }
     }

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);

         final Window win = getWindow();

         // We use a custom title, so remove the standard dialog title bar
         win.requestFeature(Window.FEATURE_NO_TITLE);

         // Full screen alerts display above the keyguard and when device is locked.
         win.addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN
                 | WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED
                 | WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD);

         setFinishOnTouchOutside(false);

         // Initialize the view.
         LayoutInflater inflater = LayoutInflater.from(this);
         setContentView(inflater.inflate(R.layout.cell_broadcast_alert, null));

         findViewById(R.id.dismissButton).setOnClickListener(
                 new Button.OnClickListener() {
                     @Override
                     public void onClick(View v) {
                         dismiss();
                     }
                 });

         // Get message list from saved Bundle or from Intent.
         if (savedInstanceState != null) {
             Log.d(TAG, "onCreate getting message list from saved instance state");
             mMessageList = savedInstanceState.getParcelableArrayList(
                     CellBroadcastMessage.SMS_CB_MESSAGE_EXTRA);
         } else {
             Log.d(TAG, "onCreate getting message list from intent");
             Intent intent = getIntent();
             mMessageList = intent.getParcelableArrayListExtra(
                     CellBroadcastMessage.SMS_CB_MESSAGE_EXTRA);

             // If we were started from a notification, dismiss it.
             clearNotification(intent);
         }

         if (mMessageList == null || mMessageList.size() == 0) {
             Log.e(TAG, "onCreate failed as message list is null or empty");
             finish();
         } else {
             Log.d(TAG, "onCreate loaded message list of size " + mMessageList.size());
         }

         // For emergency alerts, keep screen on so the user can read it
         CellBroadcastMessage message = getLatestMessage();
         if (message != null && CellBroadcastAlertService.
                 isEmergencyMessage(this, message)) {
             Log.d(TAG, "onCreate setting screen on timer for emergency alert");
             mScreenOffHandler.startScreenOnTimer();
         }

         updateAlertText(message);
     }

     /**
      * Start animating warning icon.
      */
     @Override
     protected void onResume() {
         super.onResume();
         CellBroadcastMessage message = getLatestMessage();
         if (message != null && CellBroadcastAlertService.
                 isEmergencyMessage(this, message)) {
             mAnimationHandler.startIconAnimation();
         }
     }

     /**
      * Stop animating warning icon.
      */
     @Override
     protected void onPause() {
         Log.d(TAG, "onPause called");
         mAnimationHandler.stopIconAnimation();
         super.onPause();
     }

     @Override
     protected void onStop() {
         super.onStop();
         // When the activity goes in background eg. clicking Home button, send notification.
         // Avoid doing this when activity will be recreated because of orientation change or if
         // screen goes off
         PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
         if (!(isChangingConfigurations() || getLatestMessage() == null) && pm.isScreenOn()) {
             CellBroadcastAlertService.addToNotificationBar(getLatestMessage(), mMessageList,
                     getApplicationContext(), true);
         }
     }

     /** Returns the currently displayed message. */
     CellBroadcastMessage getLatestMessage() {
         int index = mMessageList.size() - 1;
         if (index >= 0) {
             return mMessageList.get(index);
         } else {
             Log.d(TAG, "getLatestMessage returns null");
             return null;
         }
     }

     /** Removes and returns the currently displayed message. */
     private CellBroadcastMessage removeLatestMessage() {
         int index = mMessageList.size() - 1;
         if (index >= 0) {
             return mMessageList.remove(index);
         } else {
             return null;
         }
     }

     /**
      * Save the list of messages so the state can be restored later.
      * @param outState Bundle in which to place the saved state.
      */
     @Override
     protected void onSaveInstanceState(Bundle outState) {
         super.onSaveInstanceState(outState);
         outState.putParcelableArrayList(CellBroadcastMessage.SMS_CB_MESSAGE_EXTRA, mMessageList);
     }

     /**
      * Update alert text when a new emergency alert arrives.
      * @param message CB message which is used to update alert text.
      */
     private void updateAlertText(CellBroadcastMessage message) {
         int titleId = CellBroadcastResources.getDialogTitleResource(
                 getApplicationContext(), message);
         setTitle(titleId);
         ((TextView) findViewById(R.id.alertTitle)).setText(titleId);
         ((TextView) findViewById(R.id.message)).setText(message.getMessageBody());

         // Set alert reminder depending on user preference
         CellBroadcastAlertReminder.queueAlertReminder(this, true);
     }

     /**
      * Called by {@link CellBroadcastAlertService} to add a new alert to the stack.
      * @param intent The new intent containing one or more {@link CellBroadcastMessage}s.
      */
     @Override
     protected void onNewIntent(Intent intent) {
         ArrayList<CellBroadcastMessage> newMessageList = intent.getParcelableArrayListExtra(
                 CellBroadcastMessage.SMS_CB_MESSAGE_EXTRA);
         if (newMessageList != null) {
             if (intent.getBooleanExtra(FROM_SAVE_STATE_NOTIFICATION_EXTRA, false)) {
                 mMessageList = newMessageList;
             } else {
                 mMessageList.addAll(newMessageList);
             }
             Log.d(TAG, "onNewIntent called with message list of size " + newMessageList.size());
             updateAlertText(getLatestMessage());
             // If the new intent was sent from a notification, dismiss it.
             clearNotification(intent);
         } else {
             Log.e(TAG, "onNewIntent called without SMS_CB_MESSAGE_EXTRA, ignoring");
         }
     }

     /**
      * Try to cancel any notification that may have started this activity.
      * @param intent Intent containing extras used to identify if notification needs to be cleared
      */
     private void clearNotification(Intent intent) {
         if (intent.getBooleanExtra(FROM_NOTIFICATION_EXTRA, false)) {
             NotificationManager notificationManager =
                     (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
             notificationManager.cancel(CellBroadcastAlertService.NOTIFICATION_ID);
             CellBroadcastReceiverApp.clearNewMessageList();
         }
     }

     /**
      * Stop animating warning icon and stop the {@link CellBroadcastAlertAudio}
      * service if necessary.
      */
     void dismiss() {
         Log.d(TAG, "dismiss");
         // Stop playing alert sound/vibration/speech (if started)
         stopService(new Intent(this, CellBroadcastAlertAudio.class));

         // Cancel any pending alert reminder
         CellBroadcastAlertReminder.cancelAlertReminder();

         // Remove the current alert message from the list.
         CellBroadcastMessage lastMessage = removeLatestMessage();
         if (lastMessage == null) {
             Log.e(TAG, "dismiss() called with empty message list!");
             finish();
             return;
         }

         // Mark the alert as read.
         final long deliveryTime = lastMessage.getDeliveryTime();

         // Mark broadcast as read on a background thread.
         new CellBroadcastContentProvider.AsyncCellBroadcastTask(getContentResolver())
                 .execute(new CellBroadcastContentProvider.CellBroadcastOperation() {
                     @Override
                     public boolean execute(CellBroadcastContentProvider provider) {
                         return provider.markBroadcastRead(
                                 Telephony.CellBroadcasts.DELIVERY_TIME, deliveryTime);
                     }
                 });

         // Set the opt-out dialog flag if this is a CMAS alert (other than Presidential Alert).
         if (lastMessage.isCmasMessage() && lastMessage.getCmasMessageClass() !=
                 SmsCbCmasInfo.CMAS_CLASS_PRESIDENTIAL_LEVEL_ALERT) {
             mShowOptOutDialog = true;
         }

         // If there are older emergency alerts to display, update the alert text and return.
         CellBroadcastMessage nextMessage = getLatestMessage();
         if (nextMessage != null) {
             updateAlertText(nextMessage);
             if (CellBroadcastAlertService.isEmergencyMessage(
                     this, nextMessage)) {
                 mAnimationHandler.startIconAnimation();
             } else {
                 mAnimationHandler.stopIconAnimation();
             }
             return;
         }

         // Remove pending screen-off messages (animation messages are removed in onPause()).
         mScreenOffHandler.stopScreenOnTimer();

         // Show opt-in/opt-out dialog when the first CMAS alert is received.
         if (mShowOptOutDialog) {
             SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
             if (prefs.getBoolean(CellBroadcastSettings.KEY_SHOW_CMAS_OPT_OUT_DIALOG, true)) {
                 // Clear the flag so the user will only see the opt-out dialog once.
                 prefs.edit().putBoolean(CellBroadcastSettings.KEY_SHOW_CMAS_OPT_OUT_DIALOG, false)
                         .apply();

                 KeyguardManager km = (KeyguardManager) getSystemService(Context.KEYGUARD_SERVICE);
                 if (km.inKeyguardRestrictedInputMode()) {
                     Log.d(TAG, "Showing opt-out dialog in new activity (secure keyguard)");
                     Intent intent = new Intent(this, CellBroadcastOptOutActivity.class);
                     startActivity(intent);
                 } else {
                     Log.d(TAG, "Showing opt-out dialog in current activity");
                     CellBroadcastOptOutActivity.showOptOutDialog(this);
                     return; // don't call finish() until user dismisses the dialog
                 }
             }
         }
         NotificationManager notificationManager =
                 (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
         notificationManager.cancel(CellBroadcastAlertService.NOTIFICATION_ID);
         finish();
     }

     @Override
     public boolean dispatchKeyEvent(KeyEvent event) {
         CellBroadcastMessage message = getLatestMessage();
         if (message != null && !message.isEtwsMessage()) {
             switch (event.getKeyCode()) {
                 // Volume keys and camera keys mute the alert sound/vibration (except ETWS).
                 case KeyEvent.KEYCODE_VOLUME_UP:
                 case KeyEvent.KEYCODE_VOLUME_DOWN:
                 case KeyEvent.KEYCODE_VOLUME_MUTE:
                 case KeyEvent.KEYCODE_CAMERA:
                 case KeyEvent.KEYCODE_FOCUS:
                     // Stop playing alert sound/vibration/speech (if started)
                     stopService(new Intent(this, CellBroadcastAlertAudio.class));
                     return true;

                 default:
                     break;
             }
         }
         return super.dispatchKeyEvent(event);
     }

     @Override
     public void onBackPressed() {
         // Disable back key
     }
 }
	/*
	* Copyright (C) 2016 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.cellbroadcastreceiver;

	import android.app.Activity;
	import android.app.KeyguardManager;
	import android.app.NotificationManager;
	import android.content.Context;
	import android.content.Intent;
	import android.content.SharedPreferences;
	import android.content.res.Resources;
	import android.graphics.drawable.Drawable;
	import android.os.Bundle;
	import android.os.Handler;
	import android.os.Message;
	import android.os.PowerManager;
	import android.preference.PreferenceManager;
	import android.provider.Telephony;
	import android.telephony.CellBroadcastMessage;
	import android.telephony.SmsCbCmasInfo;
	import android.util.Log;
	import android.view.KeyEvent;
	import android.view.LayoutInflater;
	import android.view.View;
	import android.view.Window;
	import android.view.WindowManager;
	import android.widget.Button;
	import android.widget.ImageView;
	import android.widget.TextView;

	import java.util.ArrayList;
	import java.util.concurrent.atomic.AtomicInteger;

	/**
	* Custom alert dialog with optional flashing warning icon.
	* Alert audio and text-to-speech handled by {@link CellBroadcastAlertAudio}.
	*/
	public class CellBroadcastAlertDialog extends Activity {

	private static final String TAG = "CellBroadcastAlertDialog";

	/** Intent extra for non-emergency alerts sent when user selects the notification. */
	static final String FROM_NOTIFICATION_EXTRA = "from_notification";

	// Intent extra to identify if notification was sent while trying to move away from the dialog
	// without acknowleding the dialog
	static final String FROM_SAVE_STATE_NOTIFICATION_EXTRA = "from_save_state_notification";

	/** List of cell broadcast messages to display (oldest to newest). */
	protected ArrayList<CellBroadcastMessage> mMessageList;

	/** Whether a CMAS alert other than Presidential Alert was displayed. */
	private boolean mShowOptOutDialog;

	/** Length of time for the warning icon to be visible. */
	private static final int WARNING_ICON_ON_DURATION_MSEC = 800;

	/** Length of time for the warning icon to be off. */
	private static final int WARNING_ICON_OFF_DURATION_MSEC = 800;

	/** Length of time to keep the screen turned on. */
	private static final int KEEP_SCREEN_ON_DURATION_MSEC = 60000;

	/** Animation handler for the flashing warning icon (emergency alerts only). */
	private final AnimationHandler mAnimationHandler = new AnimationHandler();

	/** Handler to add and remove screen on flags for emergency alerts. */
	private final ScreenOffHandler mScreenOffHandler = new ScreenOffHandler();

	/**
	* Animation handler for the flashing warning icon (emergency alerts only).
	*/
	private class AnimationHandler extends Handler {
	/** Latest {@code message.what} value for detecting old messages. */
	private final AtomicInteger mCount = new AtomicInteger();

	/** Warning icon state: visible == true, hidden == false. */
	private boolean mWarningIconVisible;

	/** The warning icon Drawable. */
	private Drawable mWarningIcon;

	/** The View containing the warning icon. */
	private ImageView mWarningIconView;

	/** Package local constructor (called from outer class). */
	AnimationHandler() {}

	/** Start the warning icon animation. */
	void startIconAnimation() {
	if (!initDrawableAndImageView()) {
	return; // init failure
	}
	mWarningIconVisible = true;
	mWarningIconView.setVisibility(View.VISIBLE);
	updateIconState();
	queueAnimateMessage();
	}

	/** Stop the warning icon animation. */
	void stopIconAnimation() {
	// Increment the counter so the handler will ignore the next message.
	mCount.incrementAndGet();
	if (mWarningIconView != null) {
	mWarningIconView.setVisibility(View.GONE);
	}
	}

	/** Update the visibility of the warning icon. */
	private void updateIconState() {
	mWarningIconView.setImageAlpha(mWarningIconVisible ? 255 : 0);
	mWarningIconView.invalidateDrawable(mWarningIcon);
	}

	/** Queue a message to animate the warning icon. */
	private void queueAnimateMessage() {
	int msgWhat = mCount.incrementAndGet();
	sendEmptyMessageDelayed(msgWhat, mWarningIconVisible ? WARNING_ICON_ON_DURATION_MSEC
	: WARNING_ICON_OFF_DURATION_MSEC);
	}

	@Override
	public void handleMessage(Message msg) {
	if (msg.what == mCount.get()) {
	mWarningIconVisible = !mWarningIconVisible;
	updateIconState();
	queueAnimateMessage();
	}
	}

	/**
	* Initialize the Drawable and ImageView fields.
	* @return true if successful; false if any field failed to initialize
	*/
	private boolean initDrawableAndImageView() {
	if (mWarningIcon == null) {
	try {
	mWarningIcon = getResources().getDrawable(R.drawable.ic_warning_large);
	} catch (Resources.NotFoundException e) {
	Log.e(TAG, "warning icon resource not found", e);
	return false;
	}
	}
	if (mWarningIconView == null) {
	mWarningIconView = (ImageView) findViewById(R.id.icon);
	if (mWarningIconView != null) {
	mWarningIconView.setImageDrawable(mWarningIcon);
	} else {
	Log.e(TAG, "failed to get ImageView for warning icon");
	return false;
	}
	}
	return true;
	}
	}

	/**
	* Handler to add {@code FLAG_KEEP_SCREEN_ON} for emergency alerts. After a short delay,
	* remove the flag so the screen can turn off to conserve the battery.
	*/
	private class ScreenOffHandler extends Handler {
	/** Latest {@code message.what} value for detecting old messages. */
	private final AtomicInteger mCount = new AtomicInteger();

	/** Package local constructor (called from outer class). */
	ScreenOffHandler() {}

	/** Add screen on window flags and queue a delayed message to remove them later. */
	void startScreenOnTimer() {
	addWindowFlags();
	int msgWhat = mCount.incrementAndGet();
	removeMessages(msgWhat - 1); // Remove previous message, if any.
	sendEmptyMessageDelayed(msgWhat, KEEP_SCREEN_ON_DURATION_MSEC);
	Log.d(TAG, "added FLAG_KEEP_SCREEN_ON, queued screen off message id " + msgWhat);
	}

	/** Remove the screen on window flags and any queued screen off message. */
	void stopScreenOnTimer() {
	removeMessages(mCount.get());
	clearWindowFlags();
	}

	/** Set the screen on window flags. */
	private void addWindowFlags() {
	getWindow().addFlags(WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON
	\| WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
	}

	/** Clear the screen on window flags. */
	private void clearWindowFlags() {
	getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON
	\| WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
	}

	@Override
	public void handleMessage(Message msg) {
	int msgWhat = msg.what;
	if (msgWhat == mCount.get()) {
	clearWindowFlags();
	Log.d(TAG, "removed FLAG_KEEP_SCREEN_ON with id " + msgWhat);
	} else {
	Log.e(TAG, "discarding screen off message with id " + msgWhat);
	}
	}
	}

	@Override
	protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);

	final Window win = getWindow();

	// We use a custom title, so remove the standard dialog title bar
	win.requestFeature(Window.FEATURE_NO_TITLE);

	// Full screen alerts display above the keyguard and when device is locked.
	win.addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN
	\| WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED
	\| WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD);

	setFinishOnTouchOutside(false);

	// Initialize the view.
	LayoutInflater inflater = LayoutInflater.from(this);
	setContentView(inflater.inflate(R.layout.cell_broadcast_alert, null));

	findViewById(R.id.dismissButton).setOnClickListener(
	new Button.OnClickListener() {
	@Override
	public void onClick(View v) {
	dismiss();
	}
	});

	// Get message list from saved Bundle or from Intent.
	if (savedInstanceState != null) {
	Log.d(TAG, "onCreate getting message list from saved instance state");
	mMessageList = savedInstanceState.getParcelableArrayList(
	CellBroadcastMessage.SMS_CB_MESSAGE_EXTRA);
	} else {
	Log.d(TAG, "onCreate getting message list from intent");
	Intent intent = getIntent();
	mMessageList = intent.getParcelableArrayListExtra(
	CellBroadcastMessage.SMS_CB_MESSAGE_EXTRA);

	// If we were started from a notification, dismiss it.
	clearNotification(intent);
	}

	if (mMessageList == null \|\| mMessageList.size() == 0) {
	Log.e(TAG, "onCreate failed as message list is null or empty");
	finish();
	} else {
	Log.d(TAG, "onCreate loaded message list of size " + mMessageList.size());
	}

	// For emergency alerts, keep screen on so the user can read it
	CellBroadcastMessage message = getLatestMessage();
	if (message != null && CellBroadcastAlertService.
	isEmergencyMessage(this, message)) {
	Log.d(TAG, "onCreate setting screen on timer for emergency alert");
	mScreenOffHandler.startScreenOnTimer();
	}

	updateAlertText(message);
	}

	/**
	* Start animating warning icon.
	*/
	@Override
	protected void onResume() {
	super.onResume();
	CellBroadcastMessage message = getLatestMessage();
	if (message != null && CellBroadcastAlertService.
	isEmergencyMessage(this, message)) {
	mAnimationHandler.startIconAnimation();
	}
	}

	/**
	* Stop animating warning icon.
	*/
	@Override
	protected void onPause() {
	Log.d(TAG, "onPause called");
	mAnimationHandler.stopIconAnimation();
	super.onPause();
	}

	@Override
	protected void onStop() {
	super.onStop();
	// When the activity goes in background eg. clicking Home button, send notification.
	// Avoid doing this when activity will be recreated because of orientation change or if
	// screen goes off
	PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
	if (!(isChangingConfigurations() \|\| getLatestMessage() == null) && pm.isScreenOn()) {
	CellBroadcastAlertService.addToNotificationBar(getLatestMessage(), mMessageList,
	getApplicationContext(), true);
	}
	}

	/** Returns the currently displayed message. */
	CellBroadcastMessage getLatestMessage() {
	int index = mMessageList.size() - 1;
	if (index >= 0) {
	return mMessageList.get(index);
	} else {
	Log.d(TAG, "getLatestMessage returns null");
	return null;
	}
	}

	/** Removes and returns the currently displayed message. */
	private CellBroadcastMessage removeLatestMessage() {
	int index = mMessageList.size() - 1;
	if (index >= 0) {
	return mMessageList.remove(index);
	} else {
	return null;
	}
	}

	/**
	* Save the list of messages so the state can be restored later.
	* @param outState Bundle in which to place the saved state.
	*/
	@Override
	protected void onSaveInstanceState(Bundle outState) {
	super.onSaveInstanceState(outState);
	outState.putParcelableArrayList(CellBroadcastMessage.SMS_CB_MESSAGE_EXTRA, mMessageList);
	}

	/**
	* Update alert text when a new emergency alert arrives.
	* @param message CB message which is used to update alert text.
	*/
	private void updateAlertText(CellBroadcastMessage message) {
	int titleId = CellBroadcastResources.getDialogTitleResource(
	getApplicationContext(), message);
	setTitle(titleId);
	((TextView) findViewById(R.id.alertTitle)).setText(titleId);
	((TextView) findViewById(R.id.message)).setText(message.getMessageBody());

	// Set alert reminder depending on user preference
	CellBroadcastAlertReminder.queueAlertReminder(this, true);
	}

	/**
	* Called by {@link CellBroadcastAlertService} to add a new alert to the stack.
	* @param intent The new intent containing one or more {@link CellBroadcastMessage}s.
	*/
	@Override
	protected void onNewIntent(Intent intent) {
	ArrayList<CellBroadcastMessage> newMessageList = intent.getParcelableArrayListExtra(
	CellBroadcastMessage.SMS_CB_MESSAGE_EXTRA);
	if (newMessageList != null) {
	if (intent.getBooleanExtra(FROM_SAVE_STATE_NOTIFICATION_EXTRA, false)) {
	mMessageList = newMessageList;
	} else {
	mMessageList.addAll(newMessageList);
	}
	Log.d(TAG, "onNewIntent called with message list of size " + newMessageList.size());
	updateAlertText(getLatestMessage());
	// If the new intent was sent from a notification, dismiss it.
	clearNotification(intent);
	} else {
	Log.e(TAG, "onNewIntent called without SMS_CB_MESSAGE_EXTRA, ignoring");
	}
	}

	/**
	* Try to cancel any notification that may have started this activity.
	* @param intent Intent containing extras used to identify if notification needs to be cleared
	*/
	private void clearNotification(Intent intent) {
	if (intent.getBooleanExtra(FROM_NOTIFICATION_EXTRA, false)) {
	NotificationManager notificationManager =
	(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
	notificationManager.cancel(CellBroadcastAlertService.NOTIFICATION_ID);
	CellBroadcastReceiverApp.clearNewMessageList();
	}
	}

	/**
	* Stop animating warning icon and stop the {@link CellBroadcastAlertAudio}
	* service if necessary.
	*/
	void dismiss() {
	Log.d(TAG, "dismiss");
	// Stop playing alert sound/vibration/speech (if started)
	stopService(new Intent(this, CellBroadcastAlertAudio.class));

	// Cancel any pending alert reminder
	CellBroadcastAlertReminder.cancelAlertReminder();

	// Remove the current alert message from the list.
	CellBroadcastMessage lastMessage = removeLatestMessage();
	if (lastMessage == null) {
	Log.e(TAG, "dismiss() called with empty message list!");
	finish();
	return;
	}

	// Mark the alert as read.
	final long deliveryTime = lastMessage.getDeliveryTime();

	// Mark broadcast as read on a background thread.
	new CellBroadcastContentProvider.AsyncCellBroadcastTask(getContentResolver())
	.execute(new CellBroadcastContentProvider.CellBroadcastOperation() {
	@Override
	public boolean execute(CellBroadcastContentProvider provider) {
	return provider.markBroadcastRead(
	Telephony.CellBroadcasts.DELIVERY_TIME, deliveryTime);
	}
	});

	// Set the opt-out dialog flag if this is a CMAS alert (other than Presidential Alert).
	if (lastMessage.isCmasMessage() && lastMessage.getCmasMessageClass() !=
	SmsCbCmasInfo.CMAS_CLASS_PRESIDENTIAL_LEVEL_ALERT) {
	mShowOptOutDialog = true;
	}

	// If there are older emergency alerts to display, update the alert text and return.
	CellBroadcastMessage nextMessage = getLatestMessage();
	if (nextMessage != null) {
	updateAlertText(nextMessage);
	if (CellBroadcastAlertService.isEmergencyMessage(
	this, nextMessage)) {
	mAnimationHandler.startIconAnimation();
	} else {
	mAnimationHandler.stopIconAnimation();
	}
	return;
	}

	// Remove pending screen-off messages (animation messages are removed in onPause()).
	mScreenOffHandler.stopScreenOnTimer();

	// Show opt-in/opt-out dialog when the first CMAS alert is received.
	if (mShowOptOutDialog) {
	SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
	if (prefs.getBoolean(CellBroadcastSettings.KEY_SHOW_CMAS_OPT_OUT_DIALOG, true)) {
	// Clear the flag so the user will only see the opt-out dialog once.
	prefs.edit().putBoolean(CellBroadcastSettings.KEY_SHOW_CMAS_OPT_OUT_DIALOG, false)
	.apply();

	KeyguardManager km = (KeyguardManager) getSystemService(Context.KEYGUARD_SERVICE);
	if (km.inKeyguardRestrictedInputMode()) {
	Log.d(TAG, "Showing opt-out dialog in new activity (secure keyguard)");
	Intent intent = new Intent(this, CellBroadcastOptOutActivity.class);
	startActivity(intent);
	} else {
	Log.d(TAG, "Showing opt-out dialog in current activity");
	CellBroadcastOptOutActivity.showOptOutDialog(this);
	return; // don't call finish() until user dismisses the dialog
	}
	}
	}
	NotificationManager notificationManager =
	(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
	notificationManager.cancel(CellBroadcastAlertService.NOTIFICATION_ID);
	finish();
	}

	@Override
	public boolean dispatchKeyEvent(KeyEvent event) {
	CellBroadcastMessage message = getLatestMessage();
	if (message != null && !message.isEtwsMessage()) {
	switch (event.getKeyCode()) {
	// Volume keys and camera keys mute the alert sound/vibration (except ETWS).
	case KeyEvent.KEYCODE_VOLUME_UP:
	case KeyEvent.KEYCODE_VOLUME_DOWN:
	case KeyEvent.KEYCODE_VOLUME_MUTE:
	case KeyEvent.KEYCODE_CAMERA:
	case KeyEvent.KEYCODE_FOCUS:
	// Stop playing alert sound/vibration/speech (if started)
	stopService(new Intent(this, CellBroadcastAlertAudio.class));
	return true;

	default:
	break;
	}
	}
	return super.dispatchKeyEvent(event);
	}

	@Override
	public void onBackPressed() {
	// Disable back key
	}
	}