First Google Glass App – Part 8 – Hello Glass!

Jumping right in, let’s create a Glass GDK project from scratch:

1. Create New Android Project
2. Configure GDK
3. Imports
4. Code
5. qwe

To create a new project…See our Part 1 of the tutorial.

Make sure to configure the Glass GDK Sneak Peek Manually if it didn’t get configured by Android Studio or Eclipse on set up.  As it turns out, even if you create a project setting GDK as the Compile for API, it doesn’t get created as such.  You must double check in your build.gradle file (CAREFUL, there are 2 such files.  You need to modify your inner most gradle file) and make sure it looks something like this:

And you need to make sure that Android 4.0.3 GDK Sneak Peek & gdk.jar got added to your External Libraries as well.

Ok, once we have that out of the way, we need to include some imports.  In this case we need to add AudioManager support because we will be working with audio.  We also need TextToSpeech for recognizing commands and KeyEvent to respond to touches.

Add the following imports:

import android.app.Activity;
import android.content.Context;
import android.media.AudioManager;
import android.os.Bundle;
import android.speech.tts.TextToSpeech;
import android.view.View;
import android.view.KeyEvent;
import android.widget.TextView;

import com.google.android.glass.app.Card;
import com.google.android.glass.media.Sounds;

We will create the card and its view as well as add a TextView, nothing new here.  But we will create a TextToSpeech variable as well as a context.  We init our speech engine and pass it the value to be speak.

We will also be creating an onKeyDown method to respond to taps on the touchpad.  When they DO occur we will then create an AudioManager to play a tap sound, set the text view and also set speak a new value.

So lets add the following code:

public class HelloGlassActivity extends Activity {

private Card _card;
private View _cardView;
private TextView _statusTextView;

private TextToSpeech _speech;

private Context _context = this;

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

// Init TextToSpeech engine
_speech = new TextToSpeech(this, new TextToSpeech.OnInitListener() {
@Override
public void onInit(int status) {
_speech.speak(“Hello Glass”, TextToSpeech.QUEUE_FLUSH, null);
}
});

// An alternative way to layout the UX
setContentView(R.layout.layout_helloworld);
_statusTextView = (TextView)findViewById(R.id.status);
}

/**
* Handle the tap from the touchpad.
*/
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
switch (keyCode) {
// Handle tap events.
case KeyEvent.KEYCODE_DPAD_CENTER:
case KeyEvent.KEYCODE_ENTER:

// Status message below the main text in the alternative UX layout
AudioManager audio = (AudioManager)getSystemService(Context.AUDIO_SERVICE);
audio.playSoundEffect(Sounds.TAP);

_statusTextView.setText(R.string.touchpad_touched);

_speech.speak(“Touchpad touched”, TextToSpeech.QUEUE_FLUSH, null);

return true;
default:
return super.onKeyDown(keyCode, event);
}
}

@Override
public void onResume() {
super.onResume();
}

@Override
public void onPause() {
super.onPause();
}

@Override
public void onDestroy() {
super.onDestroy();
}
}

Its quite a simple app but it gets your juices flowing!

Plug in your Glass device and hit the Run button!