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【Java】 android传感器，检测摇晃
作者:梁小辉 / 发布于2013/2/1/ 650
package com.geek.toby;

import java.util.ArrayList;
import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.util.FloatMath;

/**
 * ????????????
 * 
 * @author toby
 */
public class ShakeDetector implements SensorEventListener {
	/**
	 * ?????????
	 */
	static final int UPDATE_INTERVAL = 100;
	/**
	 * ????μ??????
	 */
	long mLastUpdateTime;
	/**
	 * ????μ????????????x??y??z????????????????????????????
	 */
	float mLastX, mLastY, mLastZ;
	Context mContext;
	SensorManager mSensorManager;
	ArrayList<OnShakeListener> mListeners;
	/**
	 * ??μ????????????????ε????г????С????С?
	 */
	public int shakeThreshold = 5000;

	public ShakeDetector(Context context) {
		mContext = context;
		mSensorManager = (SensorManager) context
				.getSystemService(Context.SENSOR_SERVICE);
		mListeners = new ArrayList<OnShakeListener>();
	}

	/**
	 * ?????????????????????
	 * ???????????
	 */
	public interface OnShakeListener {
		/**
		 * ???????????????
		 */
		void onShake();
	}

	/**
	 * ???OnShakeListener??????????????
	 * 
	 * @param listener
	 */
	public void registerOnShakeListener(OnShakeListener listener) {
		if (mListeners.contains(listener))
			return;
		mListeners.add(listener);
	}

	/**
	 * ??????????OnShakeListener
	 * 
	 * @param listener
	 */
	public void unregisterOnShakeListener(OnShakeListener listener) {
		mListeners.remove(listener);
	}

	/**
	 * ??????μ??
	 */
	public void start() {
		if (mSensorManager == null) {
			throw new UnsupportedOperationException();
		}
		Sensor sensor = mSensorManager
				.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
		if (sensor == null) {
			throw new UnsupportedOperationException();
		}
		boolean success = mSensorManager.registerListener(this, sensor,
				SensorManager.SENSOR_DELAY_GAME);
		if (!success) {
			throw new UnsupportedOperationException();
		}
	}

	/**
	 * ????μ??
	 */
	public void stop() {
		if (mSensorManager != null)
			mSensorManager.unregisterListener(this);
	}

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

	@Override
	public void onSensorChanged(SensorEvent event) {
		long currentTime = System.currentTimeMillis();
		long diffTime = currentTime - mLastUpdateTime;
		if (diffTime < UPDATE_INTERVAL)
			return;
		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;
		mLastX = x;
		mLastY = y;
		mLastZ = z;
		float delta = FloatMath.sqrt(deltaX * deltaX + deltaY * deltaY + deltaZ
				* deltaZ)
				/ diffTime * 10000;
		if (delta > shakeThreshold) { // ?????????????????????????????????????
			this.notifyListeners();
		}
	}

	/**
	 * ????????????????????е?listener
	 */
	private void notifyListeners() {
		for (OnShakeListener listener : mListeners) {
			listener.onShake();
		}
	}
}
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