Android Tutorial => Google Awareness APIs

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Remember, the Snapshot API is used to request current state while the Fence API continuously checks for a specified state and sends callbacks when an app isn't running.

Overall, there are a few basic steps in order to use the Snapshot API or Fence API:

Get an API key from the Google Developers Console

Add necessary permissions and API key to the manifest:

 <!-- Not required for getting current headphone state -->
 <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
 <!-- Only required for actvity recognition -->
 <uses-permission android:name="com.google.android.gms.permission.ACTIVITY_RECOGNITION"/>

 <!-- Replace with your actual API key from console -->
 <meta-data android:name="com.google.android.awareness.API_KEY"
            android:value="YOUR_API_KEY"/>

 <!-- Required for Snapshot API only -->
 <meta-data android:name="com.google.android.geo.API_KEY"
            android:value="YOUR_API_KEY"/>

Initalize the GoogleApiClient somewhere, preferably in your activity's onCreate() method.

 GoogleApiClient client = new GoogleApiClient.Builder(context)
     .addApi(Awareness.API)
     .build();
 client.connect();

Call the API of your choice
Parse result

An easy way to check for the needed user permission is a method such as this:

private boolean isFineLocationGranted() {
    if (ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_FINE_LOCATION)
                != PackageManager.PERMISSION_GRANTED) {
        Log.e(getClass().getSimpleName(), "Fine location permission not granted!");
    }
}

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