车载碰撞和侧翻算法实现 - SuperIC社区_

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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 **ensorChanged(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();
}
}