android中gps的使用以及解析nmea0183协议

毕业设计中需要用到安卓的gps定位，总结一下这几天学到的关于gps相关的。

为了测试，所以布局文件很简单，只有两个TextView

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:keepScreenOn="true"    tools:context="com.catcher.testcompass.MainActivity" >    <TextView        android:id="@+id/tv_rgs84"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="高程" />    <ScrollView        android:id="@+id/scrollView1"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_alignParentLeft="true"        android:layout_below="@+id/tv_rgs84"        android:layout_marginTop="80dp" >        <LinearLayout            android:layout_width="match_parent"            android:layout_height="match_parent"            android:orientation="vertical" >            <TextView                android:id="@+id/tv_nmea"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:text="nmea" />        </LinearLayout>    </ScrollView></RelativeLayout>

具体代码实现

package com.catcher.testcompass;import android.app.Activity;import android.content.Context;import android.content.Intent;import android.hardware.GeomagneticField;import android.location.GpsStatus.NmeaListener;import android.location.Location;import android.location.LocationListener;import android.location.LocationManager;import android.os.Bundle;import android.provider.Settings;import android.widget.TextView;import android.widget.Toast;public class SecondActivity extends Activity {    private TextView tvWGS84, tvNmea;    private LocationListener gpsListener;    private LocationManager mLocationManager;    private GeomagneticField gmfield;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_second);        //显示wgs84数据        tvWGS84 = (TextView) findViewById(R.id.tv_rgs84);        //显示nmea协议中数据        tvNmea = (TextView) findViewById(R.id.tv_nmea);        mLocationManager = ((LocationManager) getSystemService(Context.LOCATION_SERVICE));        mLocationManager.addNmeaListener(new NmeaListener() {            @Override            public void onNmeaReceived(long timestamp, String nmea) {                tvNmea.invalidate();                //此处以GPGGA为例                //$GPGGA,232427.000,3751.1956,N,11231.1494,E,1,6,1.20,824.4,M,-23.0,M,,*7E                if (nmea.contains("GPGGA")) {                    String info[] = nmea.split(",");                    //GPGGA中altitude是MSL altitude(平均海平面)                    tvNmea.setText("正在使用的卫星数 " + info[7] + "\n海拔高度 " + info[9]                            + "\n地球椭球面相对大地水准面的高度 WGS84水准面划分 " + info[11]);                }            }        });        gpsListener = new MyLocationListner();    }    private class MyLocationListner implements LocationListener {        @Override        public void onLocationChanged(Location location) {            tvWGS84.invalidate();            tvNmea.invalidate();            Double longitude = location.getLongitude();            float accuracy = location.getAccuracy();            Double latitude = location.getLatitude();            Double altitude = location.getAltitude();// WGS84            float bearing = location.getBearing();            gmfield = new GeomagneticField((float) location.getLatitude(),                    (float) location.getLongitude(), (float) location.getAltitude(),                    System.currentTimeMillis());            tvWGS84.setText("Altitude=" + altitude + "\nLongitude=" + longitude + "\nLatitude="                    + latitude + "\nDeclination=" + gmfield.getDeclination() + "\nBearing="                    + bearing + "\nAccuracy=" + accuracy);        }        @Override        public void onStatusChanged(String provider, int status, Bundle extras) {        }        @Override        public void onProviderEnabled(String provider) {                    }        @Override        public void onProviderDisabled(String provider) {                    }    }    @Override    protected void onPause() {        super.onPause();        //退出Activity后不再定位        mLocationManager.removeUpdates(gpsListener);    }    @Override    protected void onResume() {        super.onResume();        //判断gps是否可用        if (mLocationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {            Toast.makeText(this, "gps可用", Toast.LENGTH_LONG).show();            //开始定位            mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000, 0, gpsListener);       }else{            Toast.makeText(this, "请打开gps或者选择gps模式为准确度高", Toast.LENGTH_LONG).show();            //前往设置GPS页面            startActivity(new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS));        }    }}

AndroidManifest添加权限

<!-- 这个权限用于进行网络定位 --><uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" ></uses-permission><!-- 这个权限用于访问GPS定位 --><uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" ></uses-permission>

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