摇一摇监听器

import android.content.Context;import android.hardware.Sensor;import android.hardware.SensorEvent;import android.hardware.SensorEventListener;import android.hardware.SensorManager;public class ShakeListener implements SensorEventListener {    private static final int SPEED_SHRESHOLD = 3000;    private static final int UPTATE_INTERVAL_TIME = 70;    String TAG = "ShakeListener";    private long lastUpdateTime;    private float lastX;    private float lastY;    private float lastZ;    private Context mContext;    private OnShakeListener onShakeListener;    private Sensor sensor;    private SensorManager sensorManager;    public interface OnShakeListener {        void onShake();    }    public ShakeListener(Context c) {        this.mContext = c;        start();    }    public void start() {        this.sensorManager = (SensorManager) this.mContext.getSystemService("sensor");        if (this.sensorManager != null) {            this.sensor = this.sensorManager.getDefaultSensor(1);        }        if (this.sensor != null) {            this.sensorManager.registerListener(this, this.sensor, 1);        }    }    public void stop() {        this.sensorManager.unregisterListener(this);    }    public void setOnShakeListener(OnShakeListener listener) {        this.onShakeListener = listener;    }    public void onSensorChanged(SensorEvent event) {        long currentUpdateTime = System.currentTimeMillis();        long timeInterval = currentUpdateTime - this.lastUpdateTime;        if (timeInterval >= 70) {            this.lastUpdateTime = currentUpdateTime;            float x = event.values[0];            float y = event.values[1];            float z = event.values[2];            float deltaX = x - this.lastX;            float deltaY = y - this.lastY;            float deltaZ = z - this.lastZ;            this.lastX = x;            this.lastY = y;            this.lastZ = z;            if ((Math.sqrt((double) (((deltaX * deltaX) + (deltaY * deltaY)) + (deltaZ * deltaZ))) / ((double) timeInterval)) * 10000.0d >= 3000.0d) {                this.onShakeListener.onShake();            }        }    }    public void onAccuracyChanged(Sensor sensor, int accuracy) {    }}
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