Question

I have read through a lot of code but I do not understand how you can make an image move using the accelerometer sensor, I understand how to register it but I do not understand how to actually make an image or a shape draw move in sync with the accelerometer axis, I am using android java to do this. Please can someone help me as I am really struggling. Thank you for your time and help.

Answer 1

So, here’s the code to register a listener (I know you said you’ve done this already, but it can never hurt):

private void enableAccelerometerListening() {
sensorManager = (SensorManager) getSystemService(COntext.SENSOR_SERVICE);
sensorManager.registerListener(sensorEventListener), sensorManager.getDefaultSensor(
Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_NORMAL);
}

private void disableAccelerometerListening() {
if (sensorManager != null) {
sesnsorManager.unregisterListener(sensorEVentListener, sensorManager.getDefaultSensor(SensorManager.SENSOR_ACCELEROMETER));
sensorManager = null;
}}

You will need a couple fields just below your class declaration:

private SesnsorManager sensorManager;
private float acceleration;
private float currentAcceleration;
private float lastAcceleration;
private static final int ACCELERATION_THRESHOLD = 15000;

Here is the event handler, which gets very close to what you need help with:

    private SensorEventListener sensorEventListener = new SensorEventListener() {
    public void onSesnsorChanged(SensorEvent event) {

    float x = event.values[0];
    float y = event.values[1];
    float z = event.values[2];

lastAcceleration = currentAcceleration; //save previous accel value

currentAcceleration = x*x + y*y + z*z;

acceleration = currentAcceleration * (currentAcceleration - lastAcceleration); // calc the change in acceleration

//if the accel is above a certain threshold:
if (acceleration > ACCELERATION_THRESHOLD) {
//MAKE YOUR CODE HERE THAT RESPONDS TO ACCELERATION EVENTS
//Note, your accel threshold should be determined by trial and error on a number of devices
}
}

public void onAccuracyChanged(Sensor sensor, int accuracy {}

};