shanke

public class ShakeActivity extends Activity implements SensorEventListener
{
private SensorManager sensorManager;

private ToastDeal deal = new ToastDeal();

private long mLastUpdateTime;

private float mLastX, mLastY, mLastZ;

private Context myContext;

public int shakeThreshold = 1000;

@Override
public void onCreate(Bundle bundle)
{
super.onCreate(bundle);
setContentView(R.layout.main);
myContext = ShakeActivity.this;
sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
}

@Override
protected void onResume()
{
super.onResume();
sensorManager.registerListener(this,sensorManager.getDefaultSensor(
Sensor.TYPE_ACCELEROMETER),//TYPE_ACCELEROMETER 传感器类型 ：加速度
SensorManager.SENSOR_DELAY_NORMAL);
}

@Override
protected void onStop()
{
sensorManager.unregisterListener(this);
super.onStop();
}

public void onAccuracyChanged(Sensor sensor, int accuracy)
{
}

public void onSensorChanged(SensorEvent event)
{
long currentTime = System.currentTimeMillis();
long diffTime = currentTime - mLastUpdateTime;
if (diffTime < Parameters.UPDATE_INTERVAL)
{
return;
}
this.mLastUpdateTime = currentTime;
float x = event.values[0];
float y = event.values[1];
float z = event.values[2];
float deltaX = x - mLastX;
float deltaY = y - mLastY;
float deltaZ = z - mLastZ;
this.mLastX = x;
this.mLastY = y;
this.mLastZ = z;
float delta = FloatMath.sqrt(deltaX * deltaX + deltaY * deltaY + deltaZ * deltaZ) / diffTime * 10000;
/**
* 当加速度的差值大于指定的阈值，认为这是一个摇晃
*/
if (delta > shakeThreshold)
{
deal.showToast(myContext, "手机执行了shake动作....");
}
}
}