Question

I would like to implement in this piece of code some instructions to increase the sensitivity of the accelerometer sensor, and increase the brightness of the screen when the phone is shaken

sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
sensorManager.registerListener(this,         sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_NORMAL);
lastUpdate = System.currentTimeMillis();

@Override
public void onSensorChanged(SensorEvent event) {
if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {                                     getAccelerometer(event);
}
}   
private void getAccelerometer(SensorEvent event) {
super.onResume();
float[] values = event.values;
// Movement
float x = values[0];
float y = values[1];
float z = values[2];
float accelationSquareRoot = (x * x + y * y + z * z)
/ (SensorManager.GRAVITY_EARTH * SensorManager.GRAVITY_EARTH);
long actualTime = System.currentTimeMillis();
if (accelationSquareRoot >= 2) //
{
if (actualTime - lastUpdate < 200) {            
return;
}           
lastUpdate = actualTime;            
Toast.makeText(this, "Device was shuffed", Toast.LENGTH_SHORT).show();  
if (mMediaPlayer.isPlaying() == false){ 
mMediaPlayer.start();               
}
}
}

Answer 1

int stretch = 50;
int boundary = 5;

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

x *= stretch;
y *= stretch;
z *= stretch;

if (x > 5 || x < -5) 
   x = 0;
if (y > 5 || y < -5) 
   y = 0;
if (z > 5 || z < -5) 
   z = 0;

just a very basic filter

as far as screen brightness goes :

private void setBrightness(int brightness) {  
try {  
  IHardwareService hardware = IHardwareService.Stub.asInterface(  
  ServiceManager.getService("hardware"));  
  if (hardware != null) {  
    hardware.setScreenBacklight(brightness);  
  }  
} catch (RemoteException doe) {            
  }          
}