GPSの研究 その22

概要

GPSを理解したかった。
android2.1でGPSロガー作って見た。

写真

サンプルコード

sdcardに、log.txtが出来る。

package com.ohisamallc.ohiapo9;

import android.app.Activity;
import android.location.GpsStatus;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.widget.TableLayout;
import android.widget.TextView;
import android.view.ViewGroup;
import java.io.FileOutputStream;
import java.io.IOException;
import android.content.Context;
import android.text.format.DateFormat;
import android.util.Log;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import android.os.Environment;

public class ohiapo9 extends Activity
{
	private LocationManager mLocationManager;
	private LocationListener mLocationListener;
	private TextView textView;
	private File aFile;
	private FileOutputStream out;
	@Override public void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		textView = new TextView(this);
		textView.setWidth(200);
		textView.setText("ok");
		TableLayout tableLayout = new TableLayout(this);
		tableLayout.addView(textView, new TableLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));
		setContentView(tableLayout);
    	aFile = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/log.txt");	
    	try
    	{
			out =  new FileOutputStream(aFile);
		} 
    	catch (FileNotFoundException e)
    	{
			e.printStackTrace();
		}
	}
	@Override protected void onDestroy()
	{
		super.onDestroy();
		mLocationManager.removeUpdates(mLocationListener);
	}
	@Override public void onStart()
	{
		super.onStart();
		mLocationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
		if (!mLocationManager.isProviderEnabled(LocationManager.GPS_PROVIDER))
		{
		}
		mLocationListener = new locationListener();
		mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 5, mLocationListener);
		mLocationManager.addNmeaListener(nmeaListener);
	}
	private final GpsStatus.NmeaListener nmeaListener = new GpsStatus.NmeaListener()
	{
		public void onNmeaReceived(long timestamp, String nmea)
		{
			String s = nmea + textView.getText().toString();
			textView.setText(s);
			try 
			{
				out.write(nmea.getBytes());
			} 
			catch (IOException e)
			{
				e.printStackTrace();
			}
		}
	};
	private class locationListener implements LocationListener
	{
		public void onLocationChanged(Location loc)
		{
		}
		public void onProviderDisabled(String arg0)
		{
		}
		public void onProviderEnabled(String provider)
		{
		}
		public void onStatusChanged(String provider, int status, Bundle extras)
		{
		}
	}
}

以上。