National Mobile Application Awareness Development & Capacity Building Program (Android Slides)

1. Android application development
Sensor
Programming

2. Android Sensors
1. Android phones support different sensors.
2. Today we write test code that reports which sensors our Android device supports.
3. Unfortunately, the emulator supports none upto SDK 1.5.
4. But we’ll see how many sensors are supported
in real device
5. We’ll create a project named SensorTest for this.
We’ll test following sensor list:
1. Accelerometer
2. Light
3. Magnetic Field
4. Orientation
5. Orientation Raw
6. Proximity
7. Temperature
8. Tricorder This is for SDK 1.5

3. Let’s create a project named
SensorTest

4. Activity to a ListActivity
1. We change our Activity to a ListActivity

5. Android Sensors Test
2. We’ll use SensorManager class
3. So we declare a List for SensorInfo
4. SensorInfo is a class defined by us which holds the sensor name and a boolean value
whether its supported or not.
5. So we create a SensorInfo class

6. ListActivity
6. Let’s get back to our ListActivity
7. We’ll now populate the list with all sensors and check whether they are enabled

7. Declare a List of SensorInfo
8. We declare a List of SensorInfo
9. Now we check each sensor one by one:
First Accelerometer
10. Now we check each sensor one by one:
then Light

8. Android Sensors Test
11. Now we check each sensor one by one:
First Magnetic field
12. Now we check each sensor one by one:
then Orientation

9. Android Sensors Test
13. Now we check each sensor one by one:
First Orientation Raw
14. Now we check each sensor one by one:
then Proximity

10. Android Sensors Test
15. Now we check each sensor one by one:
First Temperature
16. Now we check each sensor one by one:
then Tricorder

11. Android Sensors Test
17. To show the list we do the following by setting adapter
Now we run the app in emulator.
Except Accelerometer we see all sensors are disabled
May be in later SDKs we’ll get more enabled sensors

12. Android Sensors Test
Lets run this in Galaxy tab
We see the following are enabled:
1. Accelerometer
2. Light
3. Magnetic Field
4. Orientation
5. Orientation Raw
6. Proximity
So the sensor support varies from
Vendor to vendor and model to model

13. Android Sensor Programming
As we see that Accelerometer is the
1. most commonly used sensor and also
2. it has many applications in games development,
We’ll see and example of Sensor programming with Accelerometer
And as we don’t have option to move the emulator we may have to use a
sensor simulator which will simulate the sensor data.
So we download the library for sensorsimulation at:
http://openintents.googlecode.com/files/sensorsimulator-1.1.0-rc1.zip
http://code.google.com/p/openintents/downloads/detail?name=sensorsimulator-1.1.0-rc1.zip&can=2&q=
http://code.google.com/p/openintents/wiki/SensorSimulator
We can follow their instruction to use it.
But here, we’ll do it in our real device, so simulator will not be required

14. Create a project as an example
We create a layout with a simple image
which will move according to the
Accelerometer:

15. Our Activity

16. Android Sensor Programming
Adding SensorEventListener inner class with data update

17. Android Sensor Programming
Declaring variables and registering listener

18. Android Sensor Programming
Register and unregister listener on activity onStop and onResume: