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By Bruno Delb
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i.youku.com/brunodelb | www.weibo.com/brunodelb | blog.delb.cn
http://i.youku.com/brunoparis
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Lesson : The gyroscope sensor
The gyroscope sensor
• In this lesson, you will learn to use the gyroscope sensor.
• For this, you will use the SensorManager and the sensor
type TYPE_GYROSCOPE.
The gyroscope sensor
• To use the gyroscope sensor, you have to get the sensor manager with the
method getSystemService() then get the sensor by default of type
TYPE_GYROSCOPE.
SensorManager sensorManager = (SensorManager)this.getSystemService (SENSOR_SERVICE);
Sensor sensorGyroscope = sensorManager.getDefaultSensor (Sensor.TYPE_GYROSCOPE);
The gyroscope sensor
• To get the values ofthe gyroscope, you have to implementSensorEventListener and the methods onAccuracyChanged() and onSensorChanged(). With this method, you can get the values of the sensor :
extends Activity implements SensorEventListener {
public void onAccuracyChanged (Sensor sensor, int accuracy) {
}
public void onSensorChanged (SensorEvent event) {
// Values : event.values [0], event.values [1], event.values [2]
}
The gyroscope sensor
• When the application is paused (onPause() called) and whenit’s resumed (onResume() called), you have to respectivelyunregister the listener and register it :
protected void onResume() {
sensorManager.registerListener (this, sensorGyroscope, SensorManager.SENSOR_DELAY_GAME);
super.onResume();
}
protected void onPause() {
sensorManager.unregisterListener (this, sensorGyroscope);
super.onPause();
}
Layout main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<TextView
android:id="@+id/tv_output"
android:layout_width="fill_parent"
android:layout_height="match_parent" />
</LinearLayout>
File Main.java
public class Main extends Activity implements SensorEventListener {
private SensorManager sensorManager;
private Sensor sensorGyroscope;
private TextView tv_output;
public void onCreate (Bundle savedInstanceState) {
super.onCreate (savedInstanceState);
setContentView (R.layout.main);
tv_output = (TextView)findViewById (R.id.tv_output);
sensorManager = (SensorManager)this.getSystemService (SENSOR_SERVICE);
sensorGyroscope = sensorManager.getDefaultSensor (Sensor.TYPE_GYROSCOPE);
}
public void onSensorChanged (SensorEvent event) {
tv_output.setText ("0: " + event.values [0] + "\n" + "1: " + event.values [1] + "\n" + "2: " + event.values [2] + "\n");
}
File Main.java
public void onAccuracyChanged (Sensor sensor, int accuracy) {
}
protected void onResume() {
sensorManager.registerListener (this, sensorGyroscope, SensorManager.SENSOR_DELAY_GAME);
super.onResume();
}
protected void onPause() {
sensorManager.unregisterListener (this, sensorGyroscope);
super.onPause();
}
}
Test on your mobile
Sensor_Gyroscope
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Who am I ?
Bruno Delb (www.delb.cn),
Author of the first french book of development of Java mobile application (2002),
Consultant, project manager and developer of social & mobile applications,
let’s talk about your needs ...
And on Weibo :http://www.weibo.com/brunodelb
