车载碰撞和侧翻算法实现

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车载的侧翻算法根据上面的公式实现，而碰撞时根据三个方向的加速度的值。主要利用了传感器的onSensorChanged来实现。
package com.leadcore.edr.packet;import java.util.*;import android.content.Context;import android.hardware.Sensor;import android.hardware.SensorEvent;import android.hardware.SensorEventListener;import android.hardware.SensorManager;import java.lang.Math;import android.util.Log;public class GSensorService {    private static final String TAG = "GSensorService";    private Context mContext = null;    private boolean mIsRolloverWarning = false;    private boolean mIsCrashWarning = false;    public GSensorService(Context context) {        mContext = context;    }    private final SensorEventListener mSensorListener = new SensorEventListener() {        @Override        public void onSensorChanged(SensorEvent event) {            if (Sensor.TYPE_ACCELEROMETER == event.sensor.getType()) {                float xAxis = event.values[0];                float yAxis = event.values[1];                float zAxis = event.values[2];                float max_accelerometer = GlobalData.getCrashacceleration()                                            * SensorManager.STANDARD_GRAVITY / 10;                boolean isOverAccelerometer = Math.abs(xAxis) > max_accelerometer                                            || Math.abs(yAxis) > max_accelerometer                                            || Math.abs(zAxis) > max_accelerometer;                if (isOverAccelerometer && !mIsCrashWarning) {                    mIsCrashWarning = true;                    GlobalData.setWarningFlag(JTT808.MSG_WARN_CRASH_WARN);                    Log.i(TAG, "crash warning.");                } else if (!isOverAccelerometer && mIsCrashWarning) {                    mIsCrashWarning = false;                    GlobalData.ClearWarningFlag(JTT808.MSG_WARN_CRASH_WARN);                }                double rad2 = Math.atan(xAxis / Math.sqrt(yAxis * yAxis + zAxis * zAxis));                double degree2 = Math.toDegrees(rad2);                int max_degree = GlobalData.getCrashDegree();                if (Math.abs(degree2) >= max_degree && !mIsRolloverWarning) {                    mIsRolloverWarning = true;                    GlobalData.setWarningFlag(JTT808.MSG_WARN_ROLLOVER);                    Log.i(TAG, "Roll over warning.");                } else if (Math.abs(degree2) < max_degree && mIsRolloverWarning) {                    GlobalData.ClearWarningFlag(JTT808.MSG_WARN_ROLLOVER);                    mIsRolloverWarning = false;                }            }        }        @Override        public void onAccuracyChanged(Sensor sensor, int accuracy) {            // Not used.        }    };    private void registerListener() {        SensorManager sm = (SensorManager)mContext.getSystemService(Context.SENSOR_SERVICE);        sm.registerListener(mSensorListener, sm.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),                        SensorManager.SENSOR_DELAY_NORMAL);    }    public void start()  {        registerListener();    }}
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