android location位置位置決め

実装機能:現在位置を特定し、詳細を表示し、Googleマップを拡張

package com.ld.gps;

import java.util.List;
import java.util.Locale;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.location.Address;
import android.location.Criteria;
import android.location.Geocoder;
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 AppLocationGpsActivity extends Activity {

	private static final int TWO_MINUTES = 1000 * 60 * 2;
	private LocationManager locationManager;

	private String providerName;

	private Location currentBestLocation;

	private Location location;

	private Address address;

	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		//    LocationManager   

		locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);

		//    Location Provider

		providerName=getProviderName();

		//         ，   GPS     

		openGPS();

		//     

		currentBestLocation= locationManager.getLastKnownLocation(providerName);

		location=new Location(LocationManager.GPS_PROVIDER);

		if(isBetterLocation(location,currentBestLocation)){
			//            

			updateWithNewLocation(location);
			providerName=location.getProvider();

		}else{
			//            

			updateWithNewLocation(currentBestLocation);

		}


		//       locationListener ，  2 、 3           gps           。  2       ，

		//      listener    ，  3       ,                listener

		locationManager.requestLocationUpdates(providerName, 2000, 10,locationListener);
	}

	//        GPS ，    ，   GPS     

	private void openGPS() {

		if (locationManager
				.isProviderEnabled(android.location.LocationManager.GPS_PROVIDER)

				|| locationManager
						.isProviderEnabled(android.location.LocationManager.NETWORK_PROVIDER)

		) {

			Toast.makeText(this, "       ！ ", Toast.LENGTH_SHORT).show();

			return;

		}

		Toast.makeText(this, "       ！ ", Toast.LENGTH_SHORT).show();

		//    GPS     

		Intent intent = new Intent(Settings.ACTION_SECURITY_SETTINGS);

		startActivityForResult(intent, 0);

	}

	//    Location Provider

	private String getProviderName() {

		//         

		Criteria criteria = new Criteria();

		//     ： 

		criteria.setAccuracy(Criteria.ACCURACY_FINE);

		//       ： 

		criteria.setAltitudeRequired(false);

		//         :  

		criteria.setBearingRequired(false);

		//       ： 

		criteria.setCostAllowed(true);

		//     ： 

		criteria.setPowerRequirement(Criteria.POWER_LOW);

		//             provider ，  2      true    ,        provider      ,      
		// provider

		return locationManager.getBestProvider(criteria, true);

	}

	// Gps      

	private final LocationListener locationListener = new LocationListener() {

		//          

		public void onLocationChanged(Location location) {

			updateWithNewLocation(location);

		}

		// provider         

		public void onProviderDisabled(String provider) {

			updateWithNewLocation(null);

		}

		// provider         

		public void onProviderEnabled(String provider) {
		}

		// provider        

		public void onStatusChanged(String provider, int status,

		Bundle extras) {
		}

	};

	// Gps      ，      

	private void updateWithNewLocation(Location location) {

		String latLongString;

		TextView myLocationText = (TextView) findViewById(R.id.text);

		if (location != null) {

			double lat = location.getLatitude();

			double lng = location.getLongitude();

			latLongString = "    :" + lat + "
    :" + lng;

		} else {

			latLongString = "          ";

		}
		List
 addrList=getAddressbyGeoPoint(location);
		String addr="      ：";
		if(addrList!=null && !addrList.isEmpty())
			addr+=parseAddr(addrList.get(0));
		myLocationText.setText("         :
" +

		latLongString + "
" + addr);

	}

	private String parseAddr(Address address){

		return address.getAddressLine(0)+address.getAddressLine(1)+address.getAddressLine(2)+address.getFeatureName();
	}
	//       

	private List
 getAddressbyGeoPoint(Location location) {

		List
 result = null;

		//    Location     GeoPoint

		// GeoPoint gp =getGeoByLocation(location);

		try {

			if (location != null) {

				//    Geocoder ，   Geocoder          

				Geocoder gc = new Geocoder(this, Locale.getDefault());

				result = gc.getFromLocation(location.getLatitude(),
						location.getLongitude(), 1);

			}

		} catch (Exception e) {

			e.printStackTrace();

		}

		return result;

	}

	/**
	 * Determines whether one Location reading is better than the current
	 * Location fix
	 * 
	 * @param location
	 *            The new Location that you want to evaluate
	 * @param currentBestLocation
	 *            The current Location fix, to which you want to compare the new
	 *            one
	 */
	protected boolean isBetterLocation(Location location,
			Location currentBestLocation) {
		if (currentBestLocation == null) {
			// A new location is always better than no location
			return true;
		}

		// Check whether the new location fix is newer or older
		long timeDelta = location.getTime() - currentBestLocation.getTime();
		boolean isSignificantlyNewer = timeDelta > TWO_MINUTES;
		boolean isSignificantlyOlder = timeDelta < -TWO_MINUTES;
		boolean isNewer = timeDelta > 0;

		// If it's been more than two minutes since the current location, use
		// the new location
		// because the user has likely moved
		if (isSignificantlyNewer) {
			return true;
			// If the new location is more than two minutes older, it must be
			// worse
		} else if (isSignificantlyOlder) {
			return false;
		}

		// Check whether the new location fix is more or less accurate
		int accuracyDelta = (int) (location.getAccuracy() - currentBestLocation
				.getAccuracy());
		boolean isLessAccurate = accuracyDelta > 0;
		boolean isMoreAccurate = accuracyDelta < 0;
		boolean isSignificantlyLessAccurate = accuracyDelta > 200;

		// Check if the old and new location are from the same provider
		boolean isFromSameProvider = isSameProvider(location.getProvider(),
				currentBestLocation.getProvider());

		// Determine location quality using a combination of timeliness and
		// accuracy
		if (isMoreAccurate) {
			return true;
		} else if (isNewer && !isLessAccurate) {
			return true;
		} else if (isNewer && !isSignificantlyLessAccurate
				&& isFromSameProvider) {
			return true;
		}
		return false;
	}

	/** Checks whether two providers are the same */
	private boolean isSameProvider(String provider1, String provider2) {
		if (provider1 == null) {
			return provider2 == null;
		}
		return provider1.equals(provider2);
	}
}