package com.example.shakeactivity;

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 {

/* Sensor 说明
* Sensor.TYPE_ACCELEROMETER 加速度感应检測
* Sensor.TYPE_MAGNETIC_FIELD 磁场感应检測
* Sensor.TYPE_ORIENTATION 方位感应检測
* Sensor.TYPE_GYROSCOPE 回转仪感应检測
* Sensor.TYPE_LIGHT 亮度感应检測
* Sensor.TYPE_PRESSURE 压力感应检測
* Sensor.TYPE_TEMPERATURE 温度感应检測
* Sensor.TYPE_PROXIMITY 接近感应检測

* SENSOR_DELAY_FASTEST 最低延迟。一般不是特别敏感的处理不推荐使用，该种模式可能造成手机电力大量消耗。因为传递的为原始数据，算法不处理好将会影响游戏逻辑和UI的性能，所以不推荐使用。

* SENSOR_DELAY_GAME 游戏延迟，一般绝大多数的实时性较高的游戏都使用该级别
* SENSOR_DELAY_NORMAL 标准延迟，对于一般的益智类或EASY级别的游戏能够使用，但过低的採样率可能对一些赛车类游戏有跳帧现象。

* SENSOR_DELAY_UI 用户界面延迟。一般对于屏幕方向自己主动旋转使用，相对节省电能和逻辑处理，一般游戏开发中我们不使用。
*/
private static final int FORCE_THRESHOLD = 350;
private static final int TIME_THRESHOLD = 100;
private static final int SHAKE_TIMEOUT = 500;
private static final int SHAKE_DURATION = 1000;
private static final int SHAKE_COUNT = 6;

private SensorManager mSensorMgr;
private float mLastX = -1.0f, mLastY = -1.0f, mLastZ = -1.0f;
private long mLastTime;
private OnShakeListener mShakeListener;
private Context mContext;
private int mShakeCount = 0;
private long mLastShake;
private long mLastForce;

public interface OnShakeListener {
public void onShake();
//public void onShakeHorizontal();
//public void onShakeVertical();
}

public ShakeListener(Context context) {
mContext = context;
resume();
}

public void setOnShakeListener(OnShakeListener listener) {
mShakeListener = listener;
}

public void resume() {
mSensorMgr = (SensorManager) mContext
.getSystemService(Context.SENSOR_SERVICE);
if (mSensorMgr == null) {
throw new UnsupportedOperationException("Sensors not supported");
}

boolean supported = mSensorMgr.registerListener(this, mSensorMgr
.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),
SensorManager.SENSOR_DELAY_UI);
if (!supported) {
mSensorMgr.unregisterListener(this);
throw new UnsupportedOperationException(
"Accelerometer not supported");
}
}

public void pause() {
if (mSensorMgr != null) {
mSensorMgr.unregisterListener(this);
mSensorMgr = null;
}
}

@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {

}

@SuppressWarnings("deprecation")
@Override
public void onSensorChanged(SensorEvent event) {

if (event.sensor.getType() != Sensor.TYPE_ACCELEROMETER) {
return;
}

long now = System.currentTimeMillis();

if ((now - mLastForce) > SHAKE_TIMEOUT) {
mShakeCount = 0;
}

if ((now - mLastTime) > TIME_THRESHOLD) {
long diff = now - mLastTime;
float speed = Math.abs(event.values[SensorManager.DATA_X]
+ event.values[SensorManager.DATA_Y]
+ event.values[SensorManager.DATA_Z] - mLastX - mLastY - mLastZ)
/ diff * 10000;
if (speed > FORCE_THRESHOLD) {
if ((++mShakeCount >= SHAKE_COUNT)
&& (now - mLastShake > SHAKE_DURATION)) {
mLastShake = now;
mShakeCount = 0;
if (mShakeListener != null) {
mShakeListener.onShake();
}
}
mLastForce = now;
}
mLastTime = now;
mLastX = event.values[SensorManager.DATA_X];
mLastY = event.values[SensorManager.DATA_Y];
mLastZ = event.values[SensorManager.DATA_Z];
}
}
}

ShakeListener mShaker = new ShakeListener(this);
mShaker.setOnShakeListener(new ShakeListener.OnShakeListener() {
public void onShake() {
// action while shaking
setTextView("shaked");
}
});