How to Determine if Android Device has a Light Sensor, using PackageManager

public static final String FEATURE_SENSOR_LIGHT was added in API level 7
Feature for getSystemAvailableFeatures() and hasSystemFeature(String).

The device includes a light sensor.
Constant Value: "android.hardware.sensor.light"

* For API Level 3 and above, you may also use How to Determine if Android Device has Light Sensor, using SensorManager

1. Get a PackageManager Instance named myPackageManager.

2. Create a Boolean Variable named bolLightSupported. 

3. Set the Minimum and Target SDK version  to 7 or greater. 

4. In the onCreate method, add the below code. This will return the light sensor availability to a boolean named bolLightSupported. It will then display a toast displaying the light sensor availability of the device to the user.

bolLightSupported = myPackageManager.hasSystemFeature(PackageManager.FEATURE_SENSOR_LIGHT);

if (bolLightSupported) {

Toast.makeText(this, "Device has a Light Sensor", Toast.LENGTH_LONG).show();

} else {

Toast.makeText(this, "Device does NOT have a Light Sensor!", Toast.LENGTH_LONG).show();

}

5. Compile and run!

Resources:
http://developer.android.com/reference/android/content/pm/PackageManager.html#FEATURE_SENSOR_LIGHT