438 lines
14 KiB
Java
438 lines
14 KiB
Java
/*
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* Copyright (C) 2007 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.internal.location;
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import java.util.Calendar;
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import java.util.GregorianCalendar;
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import java.util.TimeZone;
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import android.location.Location;
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import android.os.Bundle;
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import android.util.Log;
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/**
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* {@hide}
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*/
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public class NmeaParser {
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private static final String TAG = "NmeaParser";
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private static final TimeZone sUtcTimeZone = TimeZone.getTimeZone("UTC");
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private static final float KNOTS_TO_METERS_PER_SECOND = 0.51444444444f;
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private final String mName;
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private int mYear = -1;
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private int mMonth;
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private int mDay;
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private long mTime = -1;
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private long mBaseTime;
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private double mLatitude;
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private double mLongitude;
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private boolean mHasAltitude;
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private double mAltitude;
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private boolean mHasBearing;
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private float mBearing;
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private boolean mHasSpeed;
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private float mSpeed;
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private boolean mNewWaypoint = false;
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private Location mLocation = null;
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private Bundle mExtras;
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public NmeaParser(String name) {
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mName = name;
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}
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private boolean updateTime(String time) {
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if (time.length() < 6) {
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return false;
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}
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if (mYear == -1) {
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// Since we haven't seen a day/month/year yet,
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// we can't construct a meaningful time stamp.
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// Clean up any old data.
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mLatitude = 0.0;
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mLongitude = 0.0;
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mHasAltitude = false;
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mHasBearing = false;
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mHasSpeed = false;
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mExtras = null;
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return false;
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}
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int hour, minute;
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float second;
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try {
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hour = Integer.parseInt(time.substring(0, 2));
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minute = Integer.parseInt(time.substring(2, 4));
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second = Float.parseFloat(time.substring(4, time.length()));
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} catch (NumberFormatException nfe) {
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Log.e(TAG, "Error parsing timestamp " + time);
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return false;
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}
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int isecond = (int) second;
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int millis = (int) ((second - isecond) * 1000);
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Calendar c = new GregorianCalendar(sUtcTimeZone);
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c.set(mYear, mMonth, mDay, hour, minute, isecond);
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long newTime = c.getTimeInMillis() + millis;
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if (mTime == -1) {
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mTime = 0;
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mBaseTime = newTime;
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}
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newTime -= mBaseTime;
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// If the timestamp has advanced, copy the temporary data
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// into a new Location
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if (newTime != mTime) {
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mNewWaypoint = true;
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mLocation = new Location(mName);
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mLocation.setTime(mTime);
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mLocation.setLatitude(mLatitude);
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mLocation.setLongitude(mLongitude);
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if (mHasAltitude) {
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mLocation.setAltitude(mAltitude);
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}
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if (mHasBearing) {
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mLocation.setBearing(mBearing);
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}
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if (mHasSpeed) {
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mLocation.setSpeed(mSpeed);
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}
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mLocation.setExtras(mExtras);
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mExtras = null;
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mTime = newTime;
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mHasAltitude = false;
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mHasBearing = false;
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mHasSpeed = false;
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}
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return true;
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}
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private boolean updateDate(String date) {
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if (date.length() != 6) {
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return false;
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}
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int month, day, year;
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try {
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day = Integer.parseInt(date.substring(0, 2));
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month = Integer.parseInt(date.substring(2, 4));
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year = 2000 + Integer.parseInt(date.substring(4, 6));
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} catch (NumberFormatException nfe) {
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Log.e(TAG, "Error parsing date " + date);
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return false;
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}
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mYear = year;
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mMonth = month;
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mDay = day;
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return true;
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}
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private boolean updateTime(String time, String date) {
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if (!updateDate(date)) {
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return false;
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}
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return updateTime(time);
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}
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private boolean updateIntExtra(String name, String value) {
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int val;
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try {
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val = Integer.parseInt(value);
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} catch (NumberFormatException nfe) {
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Log.e(TAG, "Exception parsing int " + name + ": " + value, nfe);
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return false;
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}
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if (mExtras == null) {
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mExtras = new Bundle();
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}
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mExtras.putInt(name, val);
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return true;
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}
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private boolean updateFloatExtra(String name, String value) {
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float val;
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try {
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val = Float.parseFloat(value);
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} catch (NumberFormatException nfe) {
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Log.e(TAG, "Exception parsing float " + name + ": " + value, nfe);
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return false;
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}
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if (mExtras == null) {
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mExtras = new Bundle();
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}
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mExtras.putFloat(name, val);
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return true;
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}
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private boolean updateDoubleExtra(String name, String value) {
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double val;
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try {
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val = Double.parseDouble(value);
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} catch (NumberFormatException nfe) {
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Log.e(TAG, "Exception parsing double " + name + ": " + value, nfe);
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return false;
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}
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if (mExtras == null) {
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mExtras = new Bundle();
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}
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mExtras.putDouble(name, val);
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return true;
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}
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private double convertFromHHMM(String coord) {
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double val = Double.parseDouble(coord);
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int degrees = ((int) Math.floor(val)) / 100;
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double minutes = val - (degrees * 100);
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double dcoord = degrees + minutes / 60.0;
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return dcoord;
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}
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private boolean updateLatLon(String latitude, String latitudeHemi,
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String longitude, String longitudeHemi) {
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if (latitude.length() == 0 || longitude.length() == 0) {
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return false;
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}
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// Lat/long values are expressed as {D}DDMM.MMMM
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double lat, lon;
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try {
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lat = convertFromHHMM(latitude);
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if (latitudeHemi.charAt(0) == 'S') {
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lat = -lat;
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}
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} catch (NumberFormatException nfe1) {
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Log.e(TAG, "Exception parsing lat/long: " + nfe1, nfe1);
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return false;
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}
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try {
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lon = convertFromHHMM(longitude);
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if (longitudeHemi.charAt(0) == 'W') {
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lon = -lon;
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}
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} catch (NumberFormatException nfe2) {
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Log.e(TAG, "Exception parsing lat/long: " + nfe2, nfe2);
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return false;
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}
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// Only update if both were parsed cleanly
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mLatitude = lat;
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mLongitude = lon;
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return true;
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}
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private boolean updateAltitude(String altitude) {
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if (altitude.length() == 0) {
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return false;
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}
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double alt;
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try {
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alt = Double.parseDouble(altitude);
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} catch (NumberFormatException nfe) {
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Log.e(TAG, "Exception parsing altitude " + altitude + ": " + nfe,
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nfe);
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return false;
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}
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mHasAltitude = true;
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mAltitude = alt;
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return true;
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}
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private boolean updateBearing(String bearing) {
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float brg;
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try {
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brg = Float.parseFloat(bearing);
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} catch (NumberFormatException nfe) {
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Log.e(TAG, "Exception parsing bearing " + bearing + ": " + nfe,
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nfe);
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return false;
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}
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mHasBearing = true;
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mBearing = brg;
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return true;
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}
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private boolean updateSpeed(String speed) {
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float spd;
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try {
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spd = Float.parseFloat(speed) * KNOTS_TO_METERS_PER_SECOND;
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} catch (NumberFormatException nfe) {
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Log.e(TAG, "Exception parsing speed " + speed + ": " + nfe, nfe);
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return false;
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}
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mHasSpeed = true;
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mSpeed = spd;
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return true;
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}
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public boolean parseSentence(String s) {
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int len = s.length();
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if (len < 9) {
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return false;
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}
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if (s.charAt(len - 3) == '*') {
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// String checksum = s.substring(len - 4, len);
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s = s.substring(0, len - 3);
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}
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String[] tokens = s.split(",");
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String sentenceId = tokens[0].substring(3, 6);
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int idx = 1;
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try {
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if (sentenceId.equals("GGA")) {
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String time = tokens[idx++];
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String latitude = tokens[idx++];
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String latitudeHemi = tokens[idx++];
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String longitude = tokens[idx++];
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String longitudeHemi = tokens[idx++];
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String fixQuality = tokens[idx++];
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String numSatellites = tokens[idx++];
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String horizontalDilutionOfPrecision = tokens[idx++];
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String altitude = tokens[idx++];
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String altitudeUnits = tokens[idx++];
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String heightOfGeoid = tokens[idx++];
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String heightOfGeoidUnits = tokens[idx++];
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String timeSinceLastDgpsUpdate = tokens[idx++];
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updateTime(time);
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updateLatLon(latitude, latitudeHemi,
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longitude, longitudeHemi);
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updateAltitude(altitude);
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// updateQuality(fixQuality);
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updateIntExtra("numSatellites", numSatellites);
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updateFloatExtra("hdop", horizontalDilutionOfPrecision);
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if (mNewWaypoint) {
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mNewWaypoint = false;
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return true;
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}
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} else if (sentenceId.equals("GSA")) {
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// DOP and active satellites
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String selectionMode = tokens[idx++]; // m=manual, a=auto 2d/3d
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String mode = tokens[idx++]; // 1=no fix, 2=2d, 3=3d
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for (int i = 0; i < 12; i++) {
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String id = tokens[idx++];
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}
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String pdop = tokens[idx++];
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String hdop = tokens[idx++];
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String vdop = tokens[idx++];
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// TODO - publish satellite ids
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updateFloatExtra("pdop", pdop);
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updateFloatExtra("hdop", hdop);
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updateFloatExtra("vdop", vdop);
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} else if (sentenceId.equals("GSV")) {
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// Satellites in view
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String numMessages = tokens[idx++];
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String messageNum = tokens[idx++];
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String svsInView = tokens[idx++];
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for (int i = 0; i < 4; i++) {
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if (idx + 2 < tokens.length) {
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String prnNumber = tokens[idx++];
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String elevation = tokens[idx++];
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String azimuth = tokens[idx++];
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if (idx < tokens.length) {
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String snr = tokens[idx++];
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}
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}
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}
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// TODO - publish this info
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} else if (sentenceId.equals("RMC")) {
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// Recommended minimum navigation information
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String time = tokens[idx++];
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String fixStatus = tokens[idx++];
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String latitude = tokens[idx++];
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String latitudeHemi = tokens[idx++];
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String longitude = tokens[idx++];
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String longitudeHemi = tokens[idx++];
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String speed = tokens[idx++];
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String bearing = tokens[idx++];
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String utcDate = tokens[idx++];
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String magneticVariation = tokens[idx++];
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String magneticVariationDir = tokens[idx++];
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String mode = tokens[idx++];
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if (fixStatus.charAt(0) == 'A') {
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updateTime(time, utcDate);
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updateLatLon(latitude, latitudeHemi,
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longitude, longitudeHemi);
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updateBearing(bearing);
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updateSpeed(speed);
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}
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if (mNewWaypoint) {
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return true;
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}
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} else {
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Log.e(TAG, "Unknown sentence: " + s);
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}
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} catch (ArrayIndexOutOfBoundsException e) {
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// do nothing - sentence will have no effect
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Log.e(TAG, "AIOOBE", e);
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for (int i = 0; i < tokens.length; i++) {
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Log.e(TAG, "Got token #" + i + " = " + tokens[i]);
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}
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}
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return false;
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}
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// } else if (sentenceId.equals("GLL")) {
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// // Geographics position lat/long
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// String latitude = tokens[idx++];
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// String latitudeHemi = tokens[idx++];
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// String longitude = tokens[idx++];
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// String longitudeHemi = tokens[idx++];
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// String time = tokens[idx++];
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// String status = tokens[idx++];
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// String mode = tokens[idx++];
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// String checksum = tokens[idx++];
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//
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// if (status.charAt(0) == 'A') {
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// updateTime(time);
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// updateLatLon(latitude, latitudeHemi, longitude, longitudeHemi);
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// }
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//} else if (sentenceId.equals("VTG")) {
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// String trackMadeGood = tokens[idx++];
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// String t = tokens[idx++];
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// String unused1 = tokens[idx++];
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// String unused2 = tokens[idx++];
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// String groundSpeedKnots = tokens[idx++];
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// String n = tokens[idx++];
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// String groundSpeedKph = tokens[idx++];
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// String k = tokens[idx++];
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// String checksum = tokens[idx++];
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//
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// updateSpeed(groundSpeedKph);
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public Location getLocation() {
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return mLocation;
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}
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}
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