Internal Services. CSE 5236: Mobile Application Development Instructor: Adam C. Champion, Ph.D. Course Coordinator: Dr.

Transcription

1 Internal Services CSE 5236: Mobile Application Development Instructor: Adam C. Champion, Ph.D. Course Coordinator: Dr. Rajiv Ramnath 1

2 Internal Services Communication: , SMS and telephony Audio and video: Record and playback Sensors: Accelerometer, light, magnetic, ambient temperature 2

3 Sending Java public void sendscoresvia () { Intent intent = new Intent(android.content.Intent.ACTION_SEND); intent.putextra( android.content.intent.extra_subject, "Look at my AWESOME TicTacToe Score!"); // Can also fill To: using putextra(..., EXTRA_ ) intent.settype("plain/text"); intent.putextra(android.content.intent.extra_text, firstplayername + " score is " + scoreplayerone + " and " + secondplayername + " score is " + scoreplayertwo); startactivity( intent); How to send programmatically: (or search online) 3

4 Sending Kotlin fun sendscoresvia () { val intent = Intent(Intent.ACTION_SEND) intent.putextra(intent.extra_subject, "Look at my AWESOME TicTacToe Score!") intent.type = "plain/text" intent.putextra(intent.extra_text, mfirstplayername + " score is " + mscoreplayerone + " and " + msecondplayername + " score is " + mscoreplayertwo) startactivity( intent) 4

5 SMS: Java public void sendscoresviasms() { Intent SMSIntent = new Intent(Intent.ACTION_VIEW); SMSIntent.putExtra("sms_body", "Look at my AWESOME TicTacToe Score!" + firstplayername + " score is " + scoreplayerone + " and " + secondplayername + " score is " + scoreplayertwo); SMSIntent.setType("vnd.android-dir/mms-sms"); startactivity(smsintent); Can also use SMS class; see: You need <uses-permission android:name= android.permission.send_sms /> 5

6 SMS: Kotlin fun sendscoresviasms() { val SMSIntent = Intent(Intent.ACTION_VIEW) SMSIntent.putExtra("sms_body", "Look at my AWESOME TicTacToe Score!" + mfirstplayername + " score is " + mscoreplayerone + " and " + msecondplayername + " score is " + mscoreplayertwo) SMSIntent.type = "vnd.android-dir/mms-sms" startactivity(smsintent) 6

7 Telephony: Java public void calltictactoehelp() { Intent phoneintent = new Intent(Intent.ACTION_DIAL); String phonenumber = " "; // TIC TAC HELP String uri = "tel:" + phonenumber.trim(); phoneintent.setdata(uri.parse(uri)); startactivity(phoneintent); Needs: <uses-permission android:name="android.permission.call_phone"/> 7

8 Telephony: Kotlin fun calltictactoehelp() { val phoneintent = Intent(Intent.ACTION_DIAL) val phonenumber = " " // TIC TAC HELP val uri = "tel:" + phonenumber.trim { it <= ' ' phoneintent.data = Uri.parse(uri) startactivity(phoneintent) 8

9 1. 2. Playing Audio Example: Setup <?xml version="1.0" encoding="utf-8"?> <LinearLayout... > <Button... android:text="start Audio"/> <Button... android:text="stop Audio /> <Button... android:text="record Audio"/> <Button... android:text="exit" /> </LinearLayout> View device file system in Android Studio. Transfer files via your computer s OS (ensure drivers are installed first). Media file is sampleaudio.mp3 in external storage music directory (varies among devices). Next slides show AudioFragment code (Java and Kotlin). 9

10 // AudioFragment.java private String maudiofilepath = Environment.getExternalStoragePublicDirectory( Environment.DIRECTORY_MUSIC).getPath() + File.separator + "sample_audio.mp3"; private Intent mrecordaudiointent = new Intent(MediaStore.Audio.Media.RECORD_SOUND_ACTION) private Uri maudiofileuri; public void onclick(view view) { switch (view.getid()) { case R.id.buttonAudioStart: if (!mstarted) { Intent musicintent = new Intent(getActivity().getApplicationContext(), MediaPlaybackService.class); musicintent.putextra("uristring", maudiofileuri.tostring()); 1 Log.d(TAG, "URI: " + maudiofileuri.tostring()); getactivity().startservice(musicintent); mstarted = true; break; case R.id.buttonAudioStop: getactivity().stopservice(new Intent(getActivity().getApplicationContext(), MediaPlaybackService.class)); mstarted = false; break; case R.id.buttonAudioRecord: 2 startactivityforresult(mrecordaudiointent, AUDIO_CAPTURED); break; case R.id.buttonAudioExit: getactivity().finish(); break; public void onactivityresult(int requestcode, int resultcode, Intent data) { if (resultcode == RESULT_OK && requestcode == AUDIO_CAPTURED) { maudiofileuri = data.getdata(); 10 3

11 // AudioFragment.kt private val maudiofilepath = Environment.getExternalStoragePublicDirectory( Environment.DIRECTORY_MUSIC).path + File.separator + "sample_audio.mp3" private lateinit var maudiofileuri: Uri private val mrecordaudiointent = Intent(MediaStore.Audio.Media.RECORD_SOUND_ACTION) override fun onclick(view: View) { when (view.id) { R.id.buttonAudioStart -> if (!mstarted) { val musicintent = Intent(activity.applicationContext, MediaPlaybackService::class.java) musicintent.putextra("uristring", maudiofileuri.tostring()) Log.d(TAG, "URI: " + maudiofileuri.tostring()) activity.startservice(musicintent) mstarted = true R.id.buttonAudioStop -> { activity.stopservice(intent(activity.applicationcontext, MediaPlaybackService::class.java)) mstarted = false R.id.buttonAudioRecord -> startactivityforresult(mrecordaudiointent, AUDIO_CAPTURED) R.id.buttonAudioExit -> activity.finish() override fun onactivityresult(requestcode: Int, resultcode: Int, data: Intent?) { if (resultcode == RESULT_OK && requestcode == AUDIO_CAPTURED) { if (data!= null) { maudiofileuri = data.data

12 reset() Idle setdatasource() Preparing prepareasync() Initialized OnPreparedListener. onprepared() prepare() seekto() Prepared Media prepareasync() prepare() stop() start() looping == true && playback completes Player seekto(), start() Started start() States stop() pause() stop() seekto(), pause() Stopped stop() looping == false and oncompletion() invoked on OnCompletionListener Paused stop() start() (from beginning) Playback Completed seekto() Source: 12

13 Playing Audio: Service: Java <service android:enabled="true android:name=".mediaplaybackservice /> // MediaPlayerService.java public class MediaPlaybackService extends Service { MediaPlayer public IBinder onbind(intent intent) { return public void oncreate() { player = MediaPlayer.create(this, R.raw.sample_audio); public int onstartcommand(intent intent, int flags, int startid) { super.onstartcommand(intent, flags, startid); Bundle extras = intent.getextras(); if (extras!= null) { String audiofileuristring = extras.getstring("uristring"); Uri audiofileuri = Uri.parse(audioFileURIString); try { player.reset(); player.setdatasource(this.getapplicationcontext(), audiofileuri); player.prepare(); player.start(); catch (Exception e) { e.printstacktrace(); return public void ondestroy() { player.stop(); 13

14 Playing Audio: Service: Kotlin <service android:enabled="true android:name=".mediaplaybackservice /> // MediaPlayerService.kt class MediaPlaybackService : Service() { internal lateinit var player: MediaPlayer override fun onbind(intent: Intent): IBinder? { return null override fun oncreate() { player = MediaPlayer.create(this, R.raw.sample_audio) player.apply { islooping = true override fun onstartcommand(intent: Intent, flags: Int, startid: Int): Int { super.onstartcommand(intent, flags, startid) val extras = intent.extras if (extras!= null) { val audiofileuristring = extras.getstring("uristring") val audiofileuri = Uri.parse(audioFileURIString) try { player.reset() player.setdatasource(this.applicationcontext, audiofileuri) player.prepare() player.start() catch (e: Exception) { e.printstacktrace() return Service.START_STICKY override fun ondestroy() { player.stop() 14

15 Handling Video Using VideoView <?xml version="1.0" encoding="utf-8"?> <LinearLayout... > <VideoView android:layout_height="175dip" android:layout_width="match_parent" android:layout_gravity="center" /> <Button... android:text="start Video"/> <Button... android:text="stop Video /> <Button... android:text="record Video"/> <Button... android:text="exit" /> </LinearLayout> 15

16 Handling Video: // VideoFragment.java public class VideoFragment extends Fragment Java (1) implements View.OnClickListener { private Button mbuttonstart, mbuttonstop, mbuttonrecord; private VideoView mvideoview = null; private Uri mvideofileuri = null; private Intent mrecordvideointent = new public View oncreateview(layoutinflater inflater, ViewGroup container, Bundle savedinstancestate) { View v = inflater.inflate(r.layout.fragment_video, container, false); mvideoview = (VideoView) v.findviewbyid(r.id.videoview); mbuttonstart = (Button) v.findviewbyid(r.id.buttonvideostart); // Set onclicklistener(this) mbuttonstop = (Button) v.findviewbyid(r.id.buttonvideostop); // Set onclicklistener(this) mbuttonrecord = (Button) v.findviewbyid(r.id.buttonvideorecord); // Set onclicklistener(this) Button btnexit = (Button) v.findviewbyid(r.id.buttonvideoexit); // Set onclicklistener(this) String path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MOVIES).getPath() + File.separator + "sample_video.mp4"; File videofile = new File(path); if (videofile.exists()) { mvideofileuri = Uri.fromFile(videoFile); else { // Video file doesn't exist, so load sample video from resources. String videoresourcename = "android.resource://" + getactivity().getpackagename() + File.separator + R.raw.sample_video; mvideofileuri = Uri.parse(videoResourceName); // Guard against no audio recorder app (disable the "record" button). PackageManager packagemanager = getactivity().getpackagemanager(); if (packagemanager.resolveactivity(mrecordvideointent, PackageManager.MATCH_DEFAULT_ONLY) == null) { mbuttonrecord.setenabled(false); return v; 16

17 // VideoFragment.java (continued) Handling Video: Java public void onclick(view view) { switch (view.getid()) { case R.id.buttonVideoStart: // Load and start the movie mvideoview.setvideouri(mvideofileuri); mvideoview.start(); break; case R.id.buttonVideoRecord: startactivityforresult(mrecordvideointent, VIDEO_CAPTURED); break; case R.id.buttonVideoStop: mvideoview.stopplayback(); break; case R.id.buttonVideoExit: getactivity().finish(); break; public void onactivityresult(int requestcode, int resultcode, Intent data) { if (resultcode == RESULT_OK && requestcode == VIDEO_CAPTURED) { mvideofileuri = data.getdata(); 17

18 // AudioFragment.kt class VideoFragment : Fragment(), View.OnClickListener { private lateinit var mbuttonstart: Button private lateinit var mbuttonstop: Button private lateinit var mbuttonrecord: Button private lateinit var mvideoview: VideoView private var mvideofileuri: Uri? = null private val mrecordvideointent = Intent(android.provider.MediaStore.ACTION_VIDEO_CAPTURE) override fun oncreateview(inflater: LayoutInflater, container: ViewGroup?, savedinstancestate: Bundle?): View? { val v = inflater.inflate(r.layout.fragment_video, container, false) mvideoview = v.findviewbyid<videoview>(r.id.videoview) mbuttonstart = v.findviewbyid<button>(r.id.buttonvideostart) // Set onclickli mbuttonstop = v.findviewbyid<button>(r.id.buttonvideostop) mbuttonrecord = v.findviewbyid<button>(r.id.buttonvideorecord) val btnexit = v.findviewbyid<button>(r.id.buttonvideoexit) val path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MOVIES).path + File.separator + "sample_video.mp4" val videofile = File(path) if (videofile.exists()) { mvideofileuri = Uri.fromFile(videoFile) else { // Video file doesn't exist, so load sample video from resources. val videoresourcename = "android.resource://" + activity.packagename + File.separator + R.raw.sample_video mvideofileuri = Uri.parse(videoResourceName) Handling Video: Kotlin (1) // Guard against no audio recorder app (disable the "record" button). val packagemanager = activity.packagemanager if (packagemanager.resolveactivity(mrecordvideointent, PackageManager.MATCH_DEFAULT_ONLY) == null) { mbuttonrecord.isenabled = false return v 18

19 Handling Video: Kotlin (2) override fun onclick(view: View) { when (view.id) { R.id.buttonVideoStart -> { // Load and start the movie mvideoview.setvideouri(mvideofileuri) mvideoview.start() R.id.buttonVideoRecord -> startactivityforresult(mrecordvideointent, VIDEO_CAPTURED) R.id.buttonVideoStop -> mvideoview.stopplayback() R.id.buttonVideoExit -> activity.finish() override fun onactivityresult(requestcode: Int, resultcode: Int, data: Intent?) { if (resultcode == RESULT_OK && requestcode == VIDEO_CAPTURED) { if (data!= null) { mvideofileuri = data.data 19

20 Handling Images: ImageView <?xml version="1.0" encoding="utf-8"?> <LinearLayout... > <ImageView android:layout_height="175dip" android:layout_width="match_parent" android:layout_gravity="center" /> <Button... android:text="show Image"/> <Button... android:text="take Picture"/> <Button... android:text="exit" /> </LinearLayout> 20

21 Handling Images: Java (1) // ImageFragment.java public class ImagesFragment extends Fragment implements View.OnClickListener { private ImageView imageview = null; private static Uri imagefileuri; private String imagefilepath = Environment.getExternalStoragePublicDirectory( Environment.DIRECTORY_PICTURES).getPath() + File.separator + "other_image.png"; private Bitmap imagebitmap = null; private Intent mcaptureimageintent = new Intent( public View oncreateview(layoutinflater inflater, ViewGroup container, Bundle savedinstancestate) { View v = inflater.inflate(r.layout.fragment_images, container, false); imageview = (ImageView) v.findviewbyid(r.id.imageview); Button buttonshow = (Button) v.findviewbyid(r.id.buttonimageshow); Button buttoncapture = (Button) v.findviewbyid(r.id.buttonimagecapture); Button buttonexit = (Button) v.findviewbyid(r.id.buttonimageexit); // Set up onclicklistener(this) for the buttons return v; 21

22 Handling Images: Java(2) // ImageFragment.java public void onclick(view view) { switch(view.getid()) { case R.id.buttonImageShow: File imagefile = new File(imageFilePath); if (imagefile.exists()) { imagebitmap = BitmapFactory.decodeFile(imageFilePath); imageview.setimagebitmap(imagebitmap); else { // File doesn't exist, so load a sample SVG image. imageview.setlayertype(view.layer_type_software, null); imageview.setimageresource(r.drawable.ic_scoreboard); break; case R.id.buttonImageCapture: startactivityforresult(mcaptureimageintent, IMAGE_CAPTURED); break; case R.id.buttonImageExit: getactivity().finish(); break; 22

23 Handling Images: Java (3) // ImageFragment.java (continued) public void onactivityresult(int requestcode, int resultcode, Intent cameraintent) { if (resultcode == RESULT_OK && requestcode == IMAGE_CAPTURED) { Bundle extras = cameraintent.getextras(); if (extras!= null) { imagebitmap = (Bitmap) extras.get("data"); imageview.setimagebitmap(imagebitmap); Memory management is critical for Bitmaps! Consider using an LRU cache or library such as Glide ( to handle them. See for more info. See also: 23

24 Handling Images: Kotlin (1) // ImagesFragment.kt class ImagesFragment : Fragment(), View.OnClickListener { private lateinit var imageview: ImageView private val imagefilepath = Environment.getExternalStoragePublicDirectory( Environment.DIRECTORY_PICTURES).path + File.separator + "other_image.png" private lateinit var imagebitmap: Bitmap private lateinit var imagefileuri: Uri private val mcaptureimageintent = Intent( android.provider.mediastore.action_image_capture) override fun oncreateview(inflater: LayoutInflater, container: ViewGroup?, savedinstancestate: Bundle?): View? { val v = inflater.inflate(r.layout.fragment_images, container, false) imageview = v.findviewbyid<imageview>(r.id.imageview) as ImageView val buttonshow = v.findviewbyid<button>(r.id.buttonimageshow) as Button val buttoncapture = v.findviewbyid<button>(r.id.buttonimagecapture) as Button val buttonexit = v.findviewbyid<button>(r.id.buttonimageexit) as Button // Set onclicklistener(this) for each Button return v //... 24

25 Handling Images: Kotlin (2) // ImagesFragment.kt (continued) override fun onclick(view: View) { when (view.id) { R.id.buttonImageShow -> { val imagefile = File(imageFilePath) if (imagefile.exists()) { imagebitmap = BitmapFactory.decodeFile(imageFilePath) imageview.setimagebitmap(imagebitmap) else { // File doesn't exist, so load a sample SVG image. // Disable hardware acceleration for SVGs imageview.setlayertype(view.layer_type_software, null) imageview.setimageresource(r.drawable.ic_scoreboard) R.id.buttonImageCapture -> startactivityforresult(mcaptureimageintent, IMAGE_CAPTURED) R.id.buttonImageExit -> activity.finish() 25

26 Handling Images: Kotlin (3) // ImagesFragment.kt (continued) override fun onactivityresult(requestcode: Int, resultcode: Int, cameraintent: Intent?) { if (resultcode == RESULT_OK && requestcode == IMAGE_CAPTURED) { val extras = cameraintent?.extras if (extras!= null) { imagebitmap = extras.get("data") as Bitmap imageview.setimagebitmap(imagebitmap) 26

27 Sensors Uses: Provide contextual and environmental data to app Tailor app to environment, how people are using devices Example Tic-Tac-Toe files: SensorsFragment class fragment_sensors.xml, list_item_sensor.xml Issues: Noisy sensor data on real-world devices Best tested on real devices. To simulate sensors on the emulator see: Inexpensive real devices: Moto E (4th gen.), Moto G (5th gen.). See: Amazon, ebay Type Motion Environmental Miscellaneous Examples Accelerometer, gyroscope Light, temperature, humidity, barometric pressure Camera, microphone, fingerprint, infrared 27

28 Displaying Sensors Display all device sensors (and their info) in a RecyclerView RecyclerView: displays (possibly large) dynamic list/grid of items with limited memory footprint More info: guide/topics/ui/layout/recycler view.html Views 28

29 RecyclerView Workflow Source: Figs , Bill Phillips, Chris Stewart, and Kristin Marsicano, Android Programming: The Big Nerd Ranch Guide, 3rd ed.,

30 Listing Available Sensors: Java private RecyclerView msensorrecyclerview; private SensorAdapter msensoradapter; private SensorManager msensormanager; private List<Sensor> public View oncreateview(layoutinflater inflater, ViewGroup container, Bundle savedinstancestate) { View v = inflater.inflate(r.layout.fragment_sensor_list, container, false); msensorrecyclerview = (RecyclerView) v.findviewbyid(r.id.sensor_recycler_view); msensorrecyclerview.setlayoutmanager(new LinearLayoutManager(getActivity())); msensormanager = (SensorManager) getactivity().getsystemservice(sensor_service); if (msensormanager!= null) { msensorlist = msensormanager.getsensorlist(sensor.type_all); madapter = new SensorAdapter(mSensorList); // Adapts sensor info to msensorrecyclerview.setadapter(madapter); // RecyclerView return v; 30

31 Listing Available Sensors: Kotlin private lateinit var msensorrecyclerview: RecyclerView private lateinit var madapter: SensorAdapter private lateinit var msensormanager: SensorManager private lateinit var msensorlist: List<Sensor> private var lastsensorvalues = Hashtable<String, FloatArray>() override fun oncreateview(inflater: LayoutInflater, container: ViewGroup?, savedinstancestate: Bundle?): View? { val v = inflater.inflate(r.layout.fragment_sensor_list, container, false) msensorrecyclerview = v.findviewbyid<recyclerview>(r.id.sensor_recycler_view) msensorrecyclerview.layoutmanager = LinearLayoutManager(activity) msensormanager = activity.getsystemservice(sensor_service) as SensorManager msensorlist = msensormanager.getsensorlist(sensor.type_all) madapter = SensorAdapter(mSensorList) // Adapts msensorrecyclerview.adapter = madapter return v 31

32 Sensor Holder Java private class SensorHolder extends RecyclerView.ViewHolder { private Sensor msensor; private String mdescriptionstr; private TextView msensorinfotextview; public SensorHolder(LayoutInflater inflater, ViewGroup parent) { super(inflater.inflate( R.layout.list_item_sensor, parent, false)); msensorinfotextview = (TextView) itemview.findviewbyid(r.id.sensor_data); public void bind(sensor sensor) { msensor = sensor; mdescriptionstr = getsensordescription( sensor); msensorinfotextview.settext( mdescriptionstr); Kotlin private inner class SensorHolder( inflater: LayoutInflater, parent: ViewGroup) : RecyclerView.ViewHolder( inflater.inflate(r.layout.list_item_sensor, parent, false)) { private lateinit var msensor: Sensor private lateinit var mdescriptionstr: String private val msensorinfotextview: TextView init { msensorinfotextview = itemview.findviewbyid<textview>( R.id.sensor_data) fun bind(sensor: Sensor) { msensor = sensor mdescriptionstr = getsensordescription( sensor) msensorinfotextview.text = mdescriptionstr 32

33 Sensor Adapter Java private class SensorAdapter extends RecyclerView.Adapter<SensorHolder> { private List<Sensor> msensorlist; public SensorAdapter(List<Sensor> sensorlist) { msensorlist = public SensorHolder oncreateviewholder( ViewGroup parent, int viewtype) { LayoutInflater inflater = LayoutInflater.from( getactivity()); return new SensorHolder(inflater, parent); Kotlin private inner class SensorAdapter( private val msensorlist: List<Sensor>) : RecyclerView.Adapter<SensorHolder>() { override fun oncreateviewholder( parent: ViewGroup, viewtype: Int): SensorHolder { val inflater = LayoutInflater.from( activity) return SensorHolder(inflater, public void onbindviewholder(sensorholder holder, int position) { Sensor sensor = SensorsFragment.this.mSensorList.get(position); String sensordescription = getsensordescription( sensor); public int getitemcount() { return msensorlist.size(); override fun onbindviewholder( holder: SensorHolder, position: Int) { val sensor = this@sensorsfragment. msensorlist[position] holder.bind(sensor) override fun getitemcount(): Int { return msensorlist.size 33

34 Registering Sensor Updates public void onresume() { super.onresume(); //... // Start listening to sensor updates for (Sensor sensor : msensorlist) { msensormanager.registerlistener( this, sensor, SensorManager.SENSOR_DELAY_NORMAL); public void onpause() { super.onpause(); // Stop updates when paused msensormanager.unregisterlistener(this); Kotlin override fun onresume() { super.onresume() //... // Start listening to sensor updates for (sensor in msensorlist) { msensormanager.registerlistener(this, sensor, SensorManager.SENSOR_DELAY_NORMAL) //... override fun onpause() { super.onpause() // Stop updates when paused msensormanager.unregisterlistener(this) 34

35 Receiving Sensor Updates public void onsensorchanged( SensorEvent sensorevent) { String sensoreventstring = sensoreventtostring(sensorevent); //... Log.d(TAG, "--- EVENT Raw Values ---\n + sensorname + "\n" + "Distance Last = > + distanceoflastvalue + "<\n" + "Distance This = >" + distanceofthisvalue + "<\n" + "Change = >" + change + "<\n" + "Percent = >" + percentagechange + "%\n" + "Last value = " + lastvaluestring + "<\n" + sensoreventstring); Kotlin override fun onsensorchanged( sensorevent: SensorEvent) { val sensoreventstring = sensoreventtostring(sensorevent) //... Log.d(TAG, "--- EVENT Raw Values ---\n" + sensorname + "\ndistance Last= >" + distanceoflastvalue + "<\n" + "Distance This= >" + distanceofthisvalue + "<\n" + "Change = >" + change + "<\n" + "Percent = >" + percentagechange + "%\n" + "Last value = " + lastvaluestring + "<\n" + sensoreventstring) See complete method for how to filter out noise. 35

36 Extracting Sensor Parameters Java public String getsensordescription( Sensor sensor) { return "Sensor: " + sensor.getname() + "; Ver :" + sensor.getversion() + "; Range: " + sensor.getmaximumrange() + "; Power: " + sensor.getpower() + "; Res: " + sensor.getresolution(); Kotlin fun getsensordescription( sensor: Sensor): String { return "Sensor: " + sensor.name + "; Ver :" + sensor.version + "; Range: " + sensor.maximumrange + "; Power: " + sensor.power + "; Res: " + sensor.resolution 36

37 References Chapter 11: Harnessing the Capabilities of your Android Device from Android SDK 3 Programming for Dummies Chapter 8 from Android Programming: The Big Nerd Ranch Guide, 3rd ed. (RecyclerView) Services: SMS: SIP (internet telephony): MediaPlayer: MediaRecorder: MediaStore class (extract metadata from media): Camera: BitmapFactory: Bitmap: Sensor: SensorEvent: 37

38 Thank You Questions and comments? 38