개요

사진

샘플 코드

package com.ohisamllc.ohiapp33;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.RectF;
import android.location.GpsSatellite;
import android.location.GpsStatus;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.location.LocationProvider;
import android.location.GpsStatus.Listener;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TableLayout;

public class ohiapp33 extends Activity implements LocationListener, Listener
{
    static final int NUM_SATS = 32;
    public static final class GpsInfo
    {
        GpsInfo(int prn)
        {
            this.prn = prn;
            this.name = "" + prn;
        }
        final int prn;
        final String name;
        long time = 0;
        float azimuth;
        float elev;
        float snr;
        boolean hasAl;
        boolean hasEph;
        boolean used;
        long usedTime = 0;
        RectF rect;
        float textX;
        float textY;
        int colour;
    }
    private static final String TAG = "ohiapp33";
    private static final String[] locationProviders = {
        LocationManager.NETWORK_PROVIDER,
        LocationManager.GPS_PROVIDER
    };
    private static final int[] COLOUR_PLOT = {
        0xff00ffff,
        0xff00ff00,
        0xffffff00,
        0xffff9000,
    };
    private static final int DATA_CACHE_TIME = 10 * 1000;
    private LocationManager locationManager;
    private GpsStatus gpsStatus = null;
    public  GpsInfo[] satCache;
    private int numSats;
    private final String msgOffline = "";
    private rdView  rdView;
    @Override public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        rdView = new rdView(this);
        setContentView(rdView);
        satCache = new GpsInfo[NUM_SATS + 1];
        for (int i = 1; i <= NUM_SATS; ++i)  satCache[i] = new GpsInfo(i);
        numSats = 0;
        locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
        for (String name : locationProviders)
        {
            LocationProvider prov = locationManager.getProvider(name);
            if (prov != null)
            {
                locationManager.requestLocationUpdates(name, 60000, 0f, this);
                if (name.equals(LocationManager.GPS_PROVIDER)) locationManager.addGpsStatusListener(this);
                Location prime = locationManager.getLastKnownLocation(name);
                if (prime != null)  onLocationChanged(prime);
            }
        }
    }
    @Override public void onDestroy()
    {
        locationManager.removeUpdates(this);
        locationManager.removeGpsStatusListener(this);
        locationManager = null;
        super.onDestroy();
    }
    public void onLocationChanged(Location loc)
    {
        synchronized (this)
        {
            if (loc.getProvider().equals(LocationManager.GPS_PROVIDER))
            {
                rdView.setloc(loc);
            }
        }
    }
    public void onProviderEnabled(String provider)
    {
        synchronized (this)
        {
            if (provider.equals(LocationManager.GPS_PROVIDER))
            {
            }
        }
    }
    public void onProviderDisabled(String provider)
    {
        synchronized (this)
        {
            if (provider.equals(LocationManager.GPS_PROVIDER))
            {
            }
        }
    }
    public void onStatusChanged(String provider, int status, Bundle extras)
    {
        synchronized (this)
        {
            String msg = null;
            if (status == LocationProvider.OUT_OF_SERVICE)
            {
                msg = msgOffline;
            }
            if (provider.equals(LocationManager.GPS_PROVIDER))
            {
            }
        }
    }
    public void onGpsStatusChanged(int event)
    {
        switch (event)
        {
        case GpsStatus.GPS_EVENT_SATELLITE_STATUS:
            gpsStatus = locationManager.getGpsStatus(gpsStatus);
            Iterable<GpsSatellite> sats = gpsStatus.getSatellites();
            long time = System.currentTimeMillis();
            for (GpsSatellite sat : sats)
            {
                int prn = sat.getPrn();
                if (prn < 1 || prn > NUM_SATS)  continue;
                GpsInfo ginfo = satCache[prn];
                ginfo.time = time;
                ginfo.azimuth = sat.getAzimuth();
                ginfo.elev = sat.getElevation();
                ginfo.snr = sat.getSnr();
                ginfo.hasAl = sat.hasAlmanac();
                ginfo.hasEph = sat.hasEphemeris();
                ginfo.used = sat.usedInFix();
            }
            numSats = 0;
            for (int prn = 1; prn <= NUM_SATS; ++prn)
            {
                GpsInfo ginfo = satCache[prn];
                if (time - ginfo.time > DATA_CACHE_TIME)
                {
                    ginfo.time = 0;
                    ginfo.usedTime = 0;
                }
                else
                {
                    if (ginfo.used) ginfo.usedTime = time;
                    else if (time - ginfo.usedTime <= DATA_CACHE_TIME) ginfo.used = true;
                    else ginfo.usedTime = 0;
                    int colour = ginfo.used ? 0 : ginfo.hasEph ? 1 : ginfo.hasAl ? 2 : 3;
                    ginfo.colour = COLOUR_PLOT[colour];
                    ++numSats;
                }
            }
            rdView.setInfo(satCache);
            rdView.setflg(1);
            rdView.invalidate();
        break;
        case GpsStatus.GPS_EVENT_STARTED:
        case GpsStatus.GPS_EVENT_STOPPED:
        case GpsStatus.GPS_EVENT_FIRST_FIX:
        break;
        }
    }
}
class rdView extends View
{
    static final int NUM_SATS = 32;
    private ohiapp33.GpsInfo[] satCache;
    private int flg = 0;
    private Location loc;
    private Calendar calen = Calendar.getInstance();
    public rdView(Context context)
    {
        super(context);
    }
    public void setloc(Location loc)
    {
        this.loc = loc;
    }
    public void setInfo(ohiapp33.GpsInfo[] satCache)
    {
        this.satCache = satCache;
    }
    public void setflg(int flg)
    {
        this.flg = flg;
    }
    protected void onDraw(Canvas canvas)
    {
        Paint paint = new Paint();
        paint.setColor(Color.WHITE);
        paint.setStrokeWidth(2f);
        paint.setStyle(Paint.Style.STROKE);
        int centerX = this.getWidth() / 2;
        int centerY = this.getHeight() / 2;
        float maxRadius = (Math.min(this.getHeight(), this.getWidth()) - 20) / 2;
        double[] elevations = new double[] {
            0,
            Math.PI / 2,
            Math.PI / 3,
            Math.PI / 6
        };
        for (double elevation : elevations)
        {
            double radius = (double) Math.cos(elevation) * maxRadius;
            canvas.drawCircle((float) centerX, (float) centerY, (float) radius, paint);
        }
        canvas.drawLine(centerX - maxRadius, centerY, centerX + maxRadius, centerY, paint);
        canvas.drawLine(centerX, centerY - maxRadius, centerX, centerY + maxRadius, paint);
        canvas.drawText("N", centerX - 5, centerY - maxRadius, paint);
        canvas.drawText("S", centerX - 5, centerY + maxRadius + 10, paint);
        canvas.drawText("E", centerX + maxRadius + 5, centerY + 5, paint);
        canvas.drawText("W", centerX - maxRadius - 5, centerY + 5, paint);
        paint.setStyle(Paint.Style.FILL_AND_STROKE);
        paint.setTextSize(20);
        if (flg == 1)
        {
            for (int prn = 1; prn <= NUM_SATS; prn++)
            {
                ohiapp33.GpsInfo ginfo = this.satCache[prn];
                if (ginfo.azimuth != 0)
                {
                    double h = (double) Math.cos((ginfo.elev * Math.PI) / 180) * maxRadius;
                    int satX = (int) (centerX + h * Math.sin((ginfo.azimuth * Math.PI) / 180));
                    int satY = (int) (centerY - h * Math.cos((ginfo.azimuth * Math.PI) / 180));
                    paint.setColor(ginfo.colour);
                    canvas.drawCircle(satX, satY, ginfo.snr / 3, paint);
                }
            }
            for (int prn = 1; prn <= NUM_SATS; prn++)
            {
                ohiapp33.GpsInfo ginfo = this.satCache[prn];
                if (ginfo.azimuth != 0)
                {
                    double h = (double) Math.cos((ginfo.elev * Math.PI) / 180) * maxRadius;
                    int satX = (int) (centerX + h * Math.sin((ginfo.azimuth * Math.PI) / 180));
                    int satY = (int) (centerY - h * Math.cos((ginfo.azimuth * Math.PI) / 180));
                    paint.setColor(Color.RED);
                    canvas.drawText(ginfo.name, satX + 5, satY + 5, paint);
                }
            }
            if (loc != null)
            {
                paint.setColor(Color.YELLOW);
                String p;
                p = "Lat " + new Float(loc.getLatitude()).toString();
                canvas.drawText(p, 10, 40, paint);
                p = "Lon " + new Float(loc.getLongitude()).toString();
                canvas.drawText(p, 170, 40, paint);
                p = "Alt " + new Float(loc.getAltitude()).toString() + "m";
                canvas.drawText(p, 10, 390, paint);
                if (loc.getTime() > 0)
                {
                    calen.setTimeInMillis(loc.getTime());
                    SimpleDateFormat a = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
                    canvas.drawText(a.format(calen.getTime()), 10, 420, paint);
                }
            }
        }
    }
}