Картинки на тему «На зоопарк фон»

Перевод с английского
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Recap: Android Handler

Recap: Inter-Process Communications (IPC)

Explicit Intent

Intent Filter

Content Provider

Broadcast Intents

Real Example App: iMDb

Vulnerability: Eavedropping

Vulnerability: Spoofing

Vulnerability: Permission re-Delegation

Permission System

Accessing Data in the Cloud

Картинки из презентации «На зоопарк фон» к уроку английского языка на тему «Перевод с английского»

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На зоопарк фон

содержание презентации «На зоопарк фон.ppt»

Сл	Текст	Сл	Текст
1	Mobile Software Development Framework:	27	<intent-filter> <action
	Android IPC; Intro to Mobile Push		android:name=“com.hotelapp.ACTION_BOOK&quo
	Notification. 10/16/2012 Y. Richard Yang.		; /> <data
	1.		android:scheme=“hotel"
2	Outline. Admin Android Inter-process		android:host=“name”/>
	communications Mobile push notification.		</intent-filter> </activity>
	2.		27.
3	Admin. Schedule for the rest of	28	A Design Template: Provider. @Override
3	semester. 3.		public void onCreate(Bundle
4	Recap: Event Handler Execution. Event		savedInstanceState) {
	handler (EH) executed by the main/UI		super.onCreate(savedInstanceState);
	thread’s Looper Slow EH blocks event		setContentView(R.layout.main); Intent
	processing Guidelines Notify user		intent = getIntent(); // why am I called
	Incremental update Short/non-blocking		String action = intent.getAction(); Uri
	handler, real processing offloaded to		data = intent.getdata(); String hotelName
	other thread. 4.		= data.getPath(); // do the booking
5	Recap: Background/UI Contention.		setResult(RESULT_OK); finish(); }. 28.
	Conflict with UI thread. public class	29	A Design Template: Invoker. String
	LoadingScreen extends Activity implements		action = “com.hotelapp.ACTION_BOOK";
	Runnable { @Override public void		String hotel = “hotel://name/“ +
	onCreate(Bundle savedInstanceState) {		selectedHotel; Uri data =
	super.onCreate(savedInstanceState);		Uri.parse(hotel); Intent bookingIntent =
	setContentView(R.layout.loading); // start		new Intent(action, data);
	a new thread to load Thread thread = new		startActivityForResults(bookingIntent,
	Thread(this); thread.start(); } public		requestCode); 29.
	void run(){ longRunningTask();	30	Outline. Admin Android Inter-process
	setContentView(R.layout.main); } … }. 5.		communications Intent data structure
6	Recap: Android Handler. Background		Explicit intent Implicit intent Content
	thread sends msg through handler to UI		provider as target of intent. 30.
	thread, who processes the msg. 6.	31	Content Provider. Enable uniformed API
7	Recap: Fixing LoadingScreen. Conflict		for sharing data across applications E.g.,
	with UI thread. Conflict with UI thread.		Address book, photo gallery Each provider
	Conflict with UI thread. public class		can expose its data as a simple table on a
	LoadingScreen extends Activity implements		database model Query, delete, update, and
	Runnable { private Handler mHandler = new		insert rows. 31.
	Handler(); // UI handler @Override public	32	Content Provider and Intent. Each
	void onCreate(Bundle savedInstanceState) {		content provider exposes a public URI that
	super.onCreate(savedInstanceState);		uniquely identifies its data set:
	setContentView(R.layout.loading); // start		android.provider.Contacts.Phones.CONTENT_U
	a new thread to load Thread thread = new		I
	Thread(this); thread.start(); } public		android.provider.Contacts.Photos.CONTENT_U
	void run(){ longTask();		I
	mHandler.post(mSetFinalViewTask); }		android.provider.CallLog.Calls.CONTENT_URI
	private Runnable mSetFinalViewTask = new		android.provider.Calendar.CONTENT_URI A
	Runnable() { public void run() {		content consumer declares access
	setContentView(R.layout.main); } }; }. 7.		requirement <uses-permission
8	Recap: Inter-Process Communications		android:name="android.permission.READ
	(IPC). Objective: reuse existing data and		CONTACTS"/> 32.
	services among Android components. 8.	33	Content Consumer. private void
9	Activity. Component. Service.		pickContact() { // Create an intent to
	Component. Broadcast Receiver. Component.		"pick" a contact, as defined by
	Recap: Inter-Process Communications (IPC).		the content provider URI Intent intent =
	startActivity(). startActivityForResult().		new Intent(Intent.ACTION_PICK,
	startService(). bindService().		Contacts.CONTENT_URI);
	broadcastIntent(). 9.		startActivityForResult(intent,
10	Recap: Intent Data Structure. Primary		PICK_CONTACT_REQUEST); } @Override
	pieces of info in an Intent Action: The		protected void onActivityResult(int
	general action to be performed		requestCode, int resultCode, Intent data)
	ACTION_VIEW, ACTION_DIAL, ACTION_EDIT, …		{ // If the request went well (OK) and the
	Your own definition of strings Data: a URI		request was PICK_CONTACT_REQUEST if
	tel:123 content://contacts/people/1		(resultCode == Activity.RESULT_OK
	http://zoo.cs.yale.edu/classes/cs434		&& requestCode ==
	hotel://name/Omni_New_Haven Other		PICK_CONTACT_REQUEST) { // Perform a query
	attributes Category Type (MIME type)		to the contact's content provider for the
	Component (class name) Extras (key-value		contact's name Cursor cursor =
	store). scheme. path. host. 10.		getContentResolver().query(data.getData(),
11	Explicit Intent. class: MapActivity.		new String[] {Contacts.DISPLAY_NAME},
	Map App. Yelp. To: MapActivity.class. Only		null, null, null); if
	the specified activity receives this		(cursor.moveToFirst()) { // True if the
	message.		cursor is not empty int columnIndex =
	http://developer.android.com/training/basi		cursor.getColumnIndex(Contacts.DISPLAY_NAM
	s/firstapp/starting-activity.html. 11.		); String name =
12	Declare Activity in Manifest. Make		cursor.getString(columnIndex); // Do
	sure AndroidManifest.xml announces		something with the selected contact's
	activities that can be started. See		name... } } }. 33.
	IntentController. Shown in Launcher.	34	Outline. Admin Android Inter-process
	Announce class. <application		communications Intent data structure
	android:icon="@drawable/icon”		Explicit intent Implicit intent Content
	android:label="@string/app_name"		provider as target of intent Broadcast
	> <activity		intent. 34.
	android:name=".IntentController”	35	Broadcast Intents. Multiple components
	android:label="IntentController"		may be interested in an event/update e.g.,
	> <intent-filter> <action		system event such as an incoming phone
	android:name="android.intent.action.M		call, battery level low, network cell
	IN" /> <category		changes receives notification by declaring
	android:name="android.intent.category		a broadcast receiver. 35.
	LAUNCHER" />	36	Intent and Broadcast: Sender. Example:
	</intent-filter> </activity>		IntentController. String action =
	<activity		"edu.yale.cs434.RUN"; Intent
	android:name=".TipCal"		cs434BroadcastIntent = new Intent(action);
	android:label="TipCal" >		cs434BroadcastIntent.putExtra("messag
	</activity> 12.		", "Wake up.");
13	Intent Resolution: Explicit Intent.		sendBroadcast(cs434BroadcastIntent); 36.
	Context. class name. start activity.	37	Intent and Broadcast: Receiver.
	public class IntentController extends		<uses-permission
	Activity { /** Called when the activity is		android:name="android.permission.READ
	first created. */ @Override public void		PHONE_STAT”> <receiver
	onCreate(Bundle savedInstanceState) {		android:name="MyPhoneReceiver”>
	super.onCreate(savedInstanceState);		<intent-filter> <action
	setContentView(R.layout.intentcontroller);		android:name="android.intent.action.P
	// launch tip cal button Button tipBtn =		ONE_STATE”> </action>
	(Button) findViewById(R.id.tipButton);		</intent-filter> </receiver>
	tipBtn.setOnClickListener(new		<receiver
	View.OnClickListener() { @Override public		android:name=".CS434BroadcastReceiver
	void onClick(View v) { Intent tipIntent =		quot; android:enabled="true">
	new Intent(IntentController.this,		<intent-filter> <action
	TipCal.class); startActivity(tipIntent); }		android:name="edu.yale.cs434.RUN"
	}); 13.		/> </intent-filter>
14	StartActivity for Result: Caller.		</receiver> 37.
	private void startGame() { Intent	38	Intent, Broadcast, Receiver,
	launchGame = new Intent(this,		Notification. public class
	CoolGameA.class); // passing information		CS434BroadcastReceiver extends
	to launched activity		BroadcastReceiver { public static final
	launchGame.putExtra("userName",		String CUSTOM_INTENT =
	userName);		"edu.yale.cs434.RUN"; // Display
	launchGame.putExtra("userScore",		an alert that we've received a message.
	userScore);		@Override public void onReceive(Context
	startActivityForResult(launchGame,		context, Intent intent) { if
	PLAY_GAME); }. 14.		(intent.getAction().equals(CUSTOM_INTENT))
15	StartActivity for Result: Called.		{ String message =
	public class CoolGameA extends Activity {		(String)intent.getExtras().get("messa
	private TextView tv2; int previousScore,		e"); CharSequence text = "Got
	score; String user; public void		intent " + CUSTOM_INTENT + "
	onCreate(Bundle savedInstanceState) {		with " + message; int duration =
	super.onCreate(savedInstanceState);		Toast.LENGTH_SHORT; Toast mToast =
	setContentView(R.layout.game); tv2 =		Toast.makeText(context, text, duration);
	(TextView) findViewById(R.id.game_text);		mToast.show(); } // end of if } // end of
	//Get the intent that started this		onReceive }. 38.
	activity to fetch passed info Intent i =	39	Intent, Broadcast, Receiver,
	getIntent(); //returns [] if not		Notification. public class MyPhoneReceiver
	initialized by calling activity user =		extends BroadcastReceiver { @Override
	i.getStringExtra("userName");		public void onReceive(Context context,
	//returns -1 if not initialized by calling		Intent intent) { Bundle extras =
	activity previousScore =		intent.getExtras(); if (extras != null) {
	i.getIntExtra("userScore", -1);		String state =
	tv2.setText(user + ":" +		extras.getString(TelephonyManager.EXTRA_ST
	previousScore); doSessionWithInput(user,		TE); if
	previousScore); 15.		(state.equals(TelephonyManager.EXTRA_STATE
16	StartActivity for Result: Callee.		RINGING)) { String phoneNumber =
	//change values for an example of return		extras.getString(TelephonyManager.EXTRA_IN
	score = previousScore - 41; //setup button		OMING_NUMBER); Toast.makeText(context,
	listener Button startButton = (Button)		"Incoming number: "+phoneNumber,
	findViewById(R.id.end_game);		Toast.LENGTH_LONG).show(); } // end of if
	startButton.setOnClickListener(new		} // end of if } // end of onReceive }.
	View.OnClickListener() { public void		39.
	onClick(View view) { //return information	40	Discussion: Downside of Implicit
	to calling activity Intent i =	40	Intent. 40.
	getIntent();	41	Real Example App: iMDb. 41.
	i.putExtra("returnScore",	42	Example App. IMDb App. Handles
	score); i.putExtra("returnName",		Actions: willUpdateShowtimes,
	user); setResult(RESULT_OK, i); finish();		showtimesNoLocationError. Showtime Search.
	} }); } }. 16.		Results UI. Implicit Intent Action:
17	StartActivity for Result: Caller.		willUpdateShowtimes. 42.
	private void startGame() { Intent	43	Vulnerability: Eavedropping. IMDb App.
	launchGame = new Intent(this,		Eavesdropping App. Handles Action:
	CoolGameA.class); // passing information		willUpdateShowtimes,
	to launched activity		showtimesNoLocationError. Showtime Search.
	launchGame.putExtra("userName",		Malicious Receiver. Implicit Intent
	userName);		Action: willUpdateShowtimes. Sending
	launchGame.putExtra("userScore",		Implicit Intents makes communication
	userScore);		public. 43.
	startActivityForResult(launchGame,	44	Vulnerability: Spoofing. Malicious
	PLAY_GAME); } @Override protected void		Injection App. IMDb App. Handles Action:
	onActivityResult(int requestCode, int		willUpdateShowtimes,
	resultCode, Intent data) { if (requestCode		showtimesNoLocationError. Malicious
	== PLAY_GAME && resultCode ==		Component. Results UI. Action:
	RESULT_OK) { userName =		showtimesNoLocationError. Receiving
	data.getExtras().getString(”returnName&quo		Implicit Intents makes the component
	;); userScore =		public. 44.
	data.getExtras().getInt(“returnScore"	45	Vulnerability: Man-in-the-Middle. IMDb
	; // show it has changed		App. Man-in-the-Middle App. Handles
	tv.setText(userName + ":" +		Action: willUpdateShowtimes,
	userScore); }		showtimesNoLocation Error. Handles Action:
	super.onActivityResult(requestCode,		willUpdateShowtimes,
	resultCode, data); }. 17.		showtimesNoLocationError. Showtime Search.
18	Explicit Intent: Start Service.		Results UI. Malicious Receiver. Action:
	http://developer.android.com/guide/compone		willUpdateShowtimes. Action:
	ts/services.html. public class		showtimesNoLocation Error. 45.
	PlayMusicService extends Service { public	46	Vulnerability: Spoofing. 46.
	void onCreate() { super.onCreate(); }	47	Vulnerability: Permission
	public int onStartCommand(Intent intent,		re-Delegation. Permission re-delegation
	int flags, int startId) { play_music();		occurs when an application without a
	return 1; } private void play_music() {		permission gains additional privileges
	while (true) {		through another application. 47.
	play_music_note(currentIndex);	48	Permission System. Malware. Deputy.
	currentIndex++; } } // end of play_music.		toggleWifi(). toggleWifi(). Permission
	18.		System. API. 48.
19	Discussion. Problem of explicit	49	Permission Redelegation. Malware.
19	intent. 19.		Malware. pressButton(0). Deputy.
20	Outline. Admin Android Inter-process		toggleWifi(). Permission System. API. 49.
	communications Intent data structure	50	Permission Redelegation: Reality
	Explicit intent Implicit intent. 20.		Check. Analyzed manifests of 5 system
21	Intent Resolution: Implicit Intent.		applications Built attacks using 5 of the
	Intent does not specify exact class to run		16 system apps Found 15 attacks in the 5
	Info in the Intent used by the system to		applications. 50.
	determine the best component, at run time,	51	More Examples of Attack. DeskClock:
	to handle the intent. 21.		Start an internal service Tell it to
22	Implicit Intents. Handles Action:		infinitely vibrate with a WAKE_LOCK on
	VIEW. Browser A. Yelp. Implicit Intent		Phone: Trigger the “phone call answered”
	Action: VIEW. 22.		message receiver Phone call will be
23	Implicit Intents. Handles Action:		silenced, vibrate cancelled More details
	VIEW. Browser A. Yelp. Handles Action:		see schedule page links. 51.
	VIEW. Browser B. Implicit Intent Action:	52	More Info on IPC. Intent is a high
	VIEW. 23.		level abstraction For more details on
24	Intent Filter.		implementation of Intent, see a set of
	http://developer.android.com/guide/topics/		slides on binder. 52.
	ntents/intents-filters.html. Problem: how	53	Progress So Far. Issue
	to know what an Activity/Service can		(responsiveness): slow UI is a sin
	handle? Solution:		Solution: event listener gives tasks to
	Activities/Services/Receivers declare what		background thread(s) Issue: Background
	they can/want to receive in Intent filter.		threads may need to update UI Solution:
	24.		Handler/AsyncTask so that one thread can
25	Intent Filter: Example.		delegate tasks to to another thread Issue
	AndroidManifest.xml file for		(composability): reusability is highly
	com.android.browser. String action =		desired Solution: Intent. 53.
	"android.intent.action.VIEW";	54	Accessing Data in the Cloud.
	Uri data =		Challenge: How do you keep data on a
	Uri.parse("http://www.google.com"		device fresh? 54.
	); Intent myIntent = new Intent(action,	55	Progress So Far. Issue
	data); startActivity(myIntent);		(responsiveness): slow UI is a sin
	<intent-filter> <action		Solution: event listener gives tasks to
	android:name="android.intent.action.V		background thread(s) Issue: Background
	EW" /> <category		threads may need to update UI Solution:
	android:name="android.intent.category		Handler/AsyncTask so that one thread can
	DEFAULT" /> <scheme		delegate tasks to to another thread Issue
	android:name="http" />		(composability): reusability is highly
	<scheme android:name="https"		desired Solution: Intent. 55.
	/> <scheme	56	Solution 1: Polling. Simple to
	android:name="file" />		implement Device periodically asks server
	</intent-filter> 25.		for new data/update Appropriate for
26	Implicit Start Activity. See		content that changes constantly Stock
	IntentController. action. data. public		Quotes, News Headlines Problems? 56.
	class IntentController extends Activity {	57	Impact of Polling on Battery.
	/** Called when the activity is first		Baseline: ~5-8 mA Network: ~180-200 mA Tx
	created. */ @Override public void		more expensive than Rx Assume radio stays
	onCreate(Bundle savedInstanceState) {		on for 10 sec. Energy per poll: ~0.50 mAh
	super.onCreate(savedInstanceState);		5 min frequency: ~144 mAh / day Droid 2
	setContentView(R.layout.intentcontroller);		total battery: 1400 mAh. Source: Android
	// launch dial button Button dialBtn =		development team at Google. 57.
	(Button) findViewById(R.id.dialButton);	58	Solution 2: Push Notification. Design
	dialBtn.setOnClickListener(new		issue: Who to push to client device?
	View.OnClickListener() { @Override public		Option 1: each app does it individually
	void onClick(View v) { String action =		Option 2: a shared push service. 58.
	"android.intent.action.DIAL";	59	Push Service. A single persistent
	String phno = "tel:4326400"; Uri		connection from device to a cloud push
	data = Uri.parse(phno); Intent dialIntent		service provider Multiple application
	= new Intent(action, data);		providers push to the service provider
	startActivity(tipIntent); } }); 26.		Service provider pushes to a device using
27	A Design Template: Provider.		the persistent connection Two examples
	<activity		Apple Push Notification Service (APNS)
	android:name=".Booking"		Google Cloud Messaging (GCM). 59.
	android:label=“Booking">
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