手机晃动检测
参考?http://blog.csdn.net/zhengzhiren/article/details/5930451
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package zhengzhiren.android.hardware;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;/** * 用于检测手机摇晃 * * @author 郑智仁 * @see <a href="http://blog.csdn.net/zhengzhiren" mce_href="http://blog.csdn.net/zhengzhiren">Blog</a> */public class ShakeDetector implements SensorEventListener {/** * 检测的时间间隔 */static final int UPDATE_INTERVAL = 100;/** * 上一次检测的时间 */long mLastUpdateTime;/** * 上一次检测时，加速度在x、y、z方向上的分量，用于和当前加速度比较求差。 */float mLastX, mLastY, mLastZ;Context mContext;SensorManager mSensorManager;ArrayList<OnShakeListener> mListeners;/** * 摇晃检测阈值，决定了对摇晃的敏感程度，越小越敏感。 */public int shakeThreshold = 5000;public ShakeDetector(Context context) {mContext = context;mSensorManager = (SensorManager) context.getSystemService(Context.SENSOR_SERVICE);mListeners = new ArrayList<OnShakeListener>();}/** * 当摇晃事件发生时，接收通知 */public interface OnShakeListener {/** * 当手机摇晃时被调用 */void onShake();}/** * 注册OnShakeListener，当摇晃时接收通知 * * @param listener */public void registerOnShakeListener(OnShakeListener listener) {if (mListeners.contains(listener))return;mListeners.add(listener);}/** * 移除已经注册的OnShakeListener * * @param listener */public void unregisterOnShakeListener(OnShakeListener listener) {mListeners.remove(listener);}/** * 启动摇晃检测 */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();}}/** * 停止摇晃检测 */public void stop() {if (mSensorManager != null)mSensorManager.unregisterListener(this);}@Overridepublic void onAccuracyChanged(Sensor sensor, int accuracy) {// TODO Auto-generated method stub}@Overridepublic 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) { // 当加速度的差值大于指定的阈值，认为这是一个摇晃this.notifyListeners();}}/** * 当摇晃事件发生时，通知所有的listener */private void notifyListeners() {for (OnShakeListener listener : mListeners) {listener.onShake();}}}??