GpsTask.java

package com.maxtech.common.gps;

import java.util.Timer;
import java.util.TimerTask;

import android.app.Activity;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;

@SuppressWarnings("rawtypes")
public class GpsTask extends AsyncTask {

	private GpsTaskCallBack callBk = null;
	private Activity context = null;
	private LocationManager locationManager = null;
	private LocationListener locationListener = null;
	private Location location = null;
	private boolean TIME_OUT = false;
	private boolean DATA_CONNTECTED = false;
	private long TIME_DURATION = 5000;
	private GpsHandler handler = null;
	private class GpsHandler extends Handler {

		@Override
		public void handleMessage(Message msg) {
			super.handleMessage(msg);
			if(callBk == null)
				return;
			switch (msg.what) {
			case 0:
				callBk.gpsConnected((GpsData)msg.obj);
				break;
			case 1:
				callBk.gpsConnectedTimeOut();
				break;
			}
		}
		
	}

	public GpsTask(Activity context, GpsTaskCallBack callBk) {
		this.callBk = callBk;
		this.context = context;
		gpsInit();
	}

	public GpsTask(Activity context, GpsTaskCallBack callBk, long time_out) {
		this.callBk = callBk;
		this.context = context;
		this.TIME_DURATION = time_out;
		gpsInit();
	}

	private void gpsInit() {
		locationManager = (LocationManager) context
				.getSystemService(Context.LOCATION_SERVICE);
		handler = new GpsHandler();
		if(locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
		} else {
			//GPSû�д�
			TIME_OUT = true;
		}
		locationListener = new LocationListener() {

			@Override
			public void onStatusChanged(String provider, int status,
					Bundle extras) {
			}

			@Override
			public void onProviderEnabled(String provider) {
			}

			@Override
			public void onProviderDisabled(String provider) {
			}

			@Override
			public void onLocationChanged(Location l) {
				DATA_CONNTECTED = true;
				Message msg = handler.obtainMessage();
				msg.what = 0;
				msg.obj = transData(l);
				handler.sendMessage(msg);
			}
		};
		locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0,
				100, locationListener);
	}

	@Override
	protected Object doInBackground(Object... params) {
		while (!TIME_OUT && !DATA_CONNTECTED) {
			location = locationManager
					.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
			if (location != null && callBk != null) {
				//�����һ������
				Message msg = handler.obtainMessage();
				msg.what = 0;
				msg.obj = transData(location);
				handler.sendMessage(msg);
				break;
			}
		}
		return null;
	}

	@Override
	protected void onPreExecute() {
		super.onPreExecute();
		Timer timer = new Timer();
		timer.schedule(new TimerTask() {

			@Override
			public void run() {
				TIME_OUT = true;
			}
		}, TIME_DURATION);
	}

	@SuppressWarnings("unchecked")
	@Override
	protected void onPostExecute(Object result) {
		locationManager.removeUpdates(locationListener);
		// ��ȡ��ʱ
		if (TIME_OUT && callBk != null)
			handler.sendEmptyMessage(1);
		super.onPostExecute(result);
	}

	private GpsData transData(Location location) {
		GpsData gpsData = new GpsData();
		gpsData.setAccuracy(location.getAccuracy());
		gpsData.setAltitude(location.getAltitude());
		gpsData.setBearing(location.getBearing());
		gpsData.setLatitude(location.getLatitude());
		gpsData.setLongitude(location.getLongitude());
		gpsData.setSpeed(location.getSpeed());
		gpsData.setTime(location.getTime());
		return gpsData;
	}

	public static class GpsData {
		private double latitude = 0;
		private double longitude = 0;
		private float accuracy = 0;
		private double altitude = 0;
		private float bearing = 0;
		private float speed = 0;
		private long time = 0;

		public double getLatitude() {
			return latitude;
		}

		public void setLatitude(double latitude) {
			this.latitude = latitude;
		}

		public double getLongitude() {
			return longitude;
		}

		public void setLongitude(double longitude) {
			this.longitude = longitude;
		}

		public float getAccuracy() {
			return accuracy;
		}

		public void setAccuracy(float accuracy) {
			this.accuracy = accuracy;
		}

		public double getAltitude() {
			return altitude;
		}

		public void setAltitude(double altitude) {
			this.altitude = altitude;
		}

		public float getBearing() {
			return bearing;
		}

		public void setBearing(float bearing) {
			this.bearing = bearing;
		}

		public float getSpeed() {
			return speed;
		}

		public void setSpeed(float speed) {
			this.speed = speed;
		}

		public long getTime() {
			return time;
		}

		public void setTime(long time) {
			this.time = time;
		}
	}

}