MauroCerbai: android

Oggi si è tenuto il Google I/O: la conferenza annuale in cui big G presenta i nuovi prodotti e le nuove funzionalità dei loro servizi.
Saltiamo i preamboli, quali sono questi tre annunci?

1.Smart Action Suggestion for Google Photo
L'app Photo vi proporrà delle azioni a secondo del contesto della foto. Per esempio condividere la foto con la persona che compare nella foto insieme a voi, oppure colorare una vecchia foto in bianco e nero. Una di queste azioni l'abbiamo tutti fatta spesso ma ora è più facile: convertire una foto in un documento. Google riconoscerà che è un documento e creerà automaticamente per voi un documento pdf.

2.AR Indication in Google Maps

Per semplificarvi la vita come non mai, invece di cercare di capire il nome della strada dalle targhe sempre troppo distanti da voi, Google ha inserito la possibilità di visualizzare le indicazione per il vostro tragitto sovrapposte alle immagini provenienti dalla vostra camera. Il risultato è incredibilmente semplice ed efficace.

3.Automatic Appointment Assistant

Questa la prevedo difficile da spiegare. Praticamente quando voi chiederete al vostro Assistente Google di prenotarvi un appuntamento dal vostro parrucchiere di fiducia in un giorno preciso in una fascia di orario (es. mercoledi dalle 10 alle 12) i servizi di Google si attiveranno e faranno una chiamata al negozio e concorderanno l'appuntamento con la proprietaria. Facile no? Se non fosse che dietro non c'è un call center ma un assistente virtuale robotico (lo stesso del vostro google assistant) che parlerà in maniera naturale ma soprattutto dovrà capire le risposte dell'interlocutore con l'obiettivo di concordare una data ed ora che soddisfi sia le vostre necesssità che quelle del negoziante.
Quest'ultima funzionalità è incredibile, fa impressione scoprire i passi da gigante che hanno fatto il machine learning, il cloud natural processing ed il cloud to speech. Guardate il video su youtube: https://youtu.be/D5VN56jQMWM

Nelle foto vedete il tempo esatto per poterle rivedere da video live disponibile a questo indirizzo: https://www.youtube.com/watch?v=ogfYd705cRs

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We both know that programming Android is mostly rewriting a number of times the same things.
Well here we are, save this page on the bookmarks and copy/paste when you need it.

FINDVIEWBYID

 mWeatherTextView = (TextView) findViewById(R.id.tv_weather_data);

READ JSON DATA

 JSONObject weatherdata = new JSONObject (JSONstring);  
 JSONObject weather = weatherdata.getJSONObject("weather");  
 String condition = weather.getString("condition");

BUILD URI AND CONVERT TO URL

 Uri builturi = Uri.parse(BASE_URL).buildUpon()  
     .appendQueryParameter(QUERY_PARAM, param)  
     .build();  
 URL url = null;  
 try {  
   url = new URL(builturi.toString());  
 } catch (MalformedURLException e) {  
   e.printStackTrace();  
 }  
 return url;

EXECUTE ASYNCTASK

 new GithubQueryTask().execute(githubSearchUrl);

ADD MENU IN TOP BAR

 @Override  
 public boolean onCreateOptionsMenu(Menu menu) {  
   MenuInflater inflater = getMenuInflater();  
   inflater.inflate(R.menu.forecast, menu);  
   return true;  
 } 

 @Override  
 public boolean onOptionsItemSelected(MenuItem item) {  
   if (item.getItemId() == R.id.action_refresh) {  
     mWeatherTextView.setText("");  
     loadWeatherData();  
     return true;  
   }  
   return super.onOptionsItemSelected(item);  
 }

EXPLICIT INTENT

 Intent intent = new Intent(this, SettingsActivity.class);  
 startActivity(intent);

INTENT FOR EXTERNAL MAP

 Intent intent = new Intent(Intent.ACTION_VIEW);  
 Uri uri = new Uri.Builder().scheme("geo").path("0,0").query("california").build();  
 intent.setData(uri);  
 if (intent.resolveActivity(getPackageManager()) != null) {  
   startActivity(intent);  
 }

SHARE INTENT

 Intent shareIntent = ShareCompat.IntentBuilder.from(activity)  
  .setType("text/plain")  
  .setText(shareText)  
  .getIntent();  
 if (shareIntent.resolveActivity(getPackageManager()) != null) {  
  startActivity(shareIntent);  
 }

ITEM IN THE ACTION BAR

 <item  
   android:id="@+id/action_share"  
   android:title="Share"  
   android:orderInCategory="1"  
   app:showAsAction="ifRoom"/>

ASYNCTASKLOADER

(it handles lifecycle)

 @Override  
 public Loader<String[]> onCreateLoader(int id, Bundle args) {  
   return new AsyncTaskLoader<String[]>(this) {  
     String[] weatherData = null; //Cache data  
     @Override protected void onStartLoading() {}//Check cache data and show progress bar then forceLoad()  
     @Override public String[] loadInBackground() {}//Get data from prefences or bundle and do network request  
     @Override public void deliverResult(String[] data) {}//save data in cache  
   };  
 }

USE PREFERENCEFRAGMENT

SHAREDPREFERENCES

 SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);  
 sharedPreferences.getBoolean("show_bass", true);

LISTEN TO SWYPE ON RECYCLEVIEW

 new ItemTouchHelper(new ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT) {  
   @Override  
   public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {  
     return false;  
   }  
   @Override  
   public void onSwiped(RecyclerView.ViewHolder viewHolder, int swipeDir) {  
     long id = (long) viewHolder.itemView.getTag();  
     removeGuest(id);  
     mAdapter.swapCursor(getAllGuests());  
   }  
 }).attachToRecyclerView(waitlistRecyclerView);

Here some interesting images too:

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Hey,
First of all take a deep look at part 1 available here.
Instead what's new on part 2? Well basically two things:

in part 1 we built an app to receive constant location update, so this time we will see how to get just on time only
we will see how activity recognition works

Part 1 - Getting the last known location

So, how to receive the last gps location once from the google api services?

Follow every instruction of the part 1 and then on the onConnected method write this:

@Override
public void onConnected(@Nullable Bundle bundle) {
    mLastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
    if (mLastLocation != null) {
        mLatitude.setText(String.valueOf(mLastLocation.getLatitude()));
        mLatitude.setText(String.valueOf(mLastLocation.getLongitude()));
    }
}

Part 2 - Activity Recognition

Add the permission in your app manifest file:

<uses-permission android:name="com.google.android.gms.permTission.ACTIVITY_RECOGNITION" />

Then to handle the activity recognition in background we are gonna use an IntentService:

public class DetectedActivitiesIntentService extends IntentService {
    protected static final String TAG = "detections_is";
    public static final String BROADCAST_ACTION = "com.maurocerbai.googleaudacitylocationpart2.BROADCASTACTION";
    public static final String ACTIVITY_EXTRA = "com.maurocerbai.googleaudacitylocationpart2.ACTIVITYEXTRA";
    public DetectedActivitiesIntentService() {
        super(TAG);
    }
    @Override    protected void onHandleIntent(Intent intent) {
        ActivityRecognitionResult result = ActivityRecognitionResult.extractResult(intent);
        Intent localIntent = new Intent(BROADCAST_ACTION);
        ArrayList <DetectedActivity> detectedActivities = (ArrayList) result.getProbableActivities();
        localIntent.putExtra(ACTIVITY_EXTRA,detectedActivities);
        LocalBroadcastManager.getInstance(this).sendBroadcast(localIntent);
    }
}

Don't forget to declare this service in the manifest:

<service android:name=".DetectedActivitiesIntentService"    android:exported="false" />

In your main activity build your goolge api connection as seen in part 1 but instead of location use activityrecognition as shown here:

private void buildGoogleApiClient() {
    mGoogleApiClient = new GoogleApiClient.Builder(this)
            .addConnectionCallbacks(this)
            .addOnConnectionFailedListener(this)
            .addApi(ActivityRecognition.API)
            .build();
}

and add the possibility to listen to the broadcast you made before in a inner class:

class ActivityDetectionBroadcastReceiver extends BroadcastReceiver{
    @Override    public void onReceive(Context context, Intent intent) {
        ArrayList <DetectedActivity> detectedActivities = intent.getParcelableArrayListExtra(Constants.ACTIVITY_EXTRA);
        String res = "";
        for (DetectedActivity d:detectedActivities)
            res+=d.getType()+" "+d.getConfidence();
        text_label.setText(res);
    }
}

Then a this two method and link them to the button of the view:

public void requestActivityUpdateButtonHandler (View view){
    ActivityRecognition.ActivityRecognitionApi.requestActivityUpdates(mGoogleApiClient,1000,getActivityDetectionPendingIntent()).setResultCallback(this);
}
public void removeActivityUpdateButtonHandler (View view){
    ActivityRecognition.ActivityRecognitionApi.removeActivityUpdates(mGoogleApiClient,getActivityDetectionPendingIntent()).setResultCallback(this);
}

Don't forget to handle the activity lifecycle adding this two method:

@Override protected void onResume() {
    super.onResume();
    LocalBroadcastManager.getInstance(this).registerReceiver(mActivityDetectionBroadcastReceiver,new IntentFilter(Constants.BROADCAST_ACTION));
}
@Override protected void onPause() {
    LocalBroadcastManager.getInstance(this).unregisterReceiver(mActivityDetectionBroadcastReceiver);
    super.onPause();
}

DONE. Good luck testing it because the emulator is not very helpful in this case. Maybe using a GPX file you can simulate the movements using the latest version of the sdk tools.
You can find the code here : https://bitbucket.org/mcmaur/googleaudacitylocationpart2

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"One of the unique features of mobile applications is location awareness. Mobile users take their devices with them everywhere, and adding location awareness to your app offers users a more contextual experience. The location APIs available in Google Play services facilitate adding location awareness to your app with automated location tracking, geofencing, and activity recognition."

How to do that? Never been so simple:

Create a Google Api Client that use the api you need

mGoogleApiClient = new GoogleApiClient.Builder(this)

.addApi(LocationServices.API)

.addConnectionCallbacks(this)

.addOnConnectionFailedListener(this)

.build();

Implements

GoogleApiClientConnectionCallbacks
GoogleApiClient.onConnectionFailedListener
LocationListener

Wait for a onConnected callback and ask for updates on location

mLocationRequest = LocationRequest.create()

.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY)

.setInterval(1000);

LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient,mLocationRequest,this);

Wait for an other callback OnLocationChanged

@Override

public void onLocationChanged(Location location) {

Log.d(LOG_TAG,"location: "+location.toString());

}

!NB: rembember to set:

the permission on the manifest file

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"></uses-permission>

2.Add the play services library in the manifest like this

3. Add the lib to build gradle

compile 'com.google.android.gms:play-services:8.4.0'

Do not forget to call the appropiate method in order to deal with the activity lifecycle:

  @Override
    protected void onStart() {
        super.onStart();
        mGoogleApiClient.connect();
    }

    @Override
    protected void onStop() {
        mGoogleApiClient.disconnect();
        super.onStop();
    }

My code is available here : https://bitbucket.org/mcmaur/googleaudacitylocationpart1

Happy coding!

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MauroCerbai

FINDVIEWBYID

READ JSON DATA

BUILD URI AND CONVERT TO URL

EXECUTE ASYNCTASK

ADD MENU IN TOP BAR

EXPLICIT INTENT

INTENT FOR EXTERNAL MAP

SHARE INTENT

ITEM IN THE ACTION BAR

ASYNCTASKLOADER

USE PREFERENCEFRAGMENT

SHAREDPREFERENCES

LISTEN TO SWYPE ON RECYCLEVIEW

How to add firebase analytics to an android app

How to add your custom event

Part 1 - Getting the last known location

Part 2 - Activity Recognition

Unturned Guide Express

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