Android GPS获取地理位置并计算距离
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package com.qeesoft.gps;
import android.app.Activity;
import android.content.Context;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
public class GPSSpeed extends Activity {
private Location preLocation;
private long preTime;
private static final int step=5000; //msecs
private LocationManager locationManager;
private boolean status=false;
private Button btn;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btn=(Button)findViewById(R.id.beginBtn);
btn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
if(!status){
status=true;
startLoactionService();
btn.setText("点击这里停止");
}else{
status=false;
stopLocationService();
btn.setText("点击这里开始");
}
}
});
}
public void startLoactionService(){
String serviceName = Context.LOCATION_SERVICE;
locationManager = (LocationManager)getSystemService(serviceName);
//String provider = LocationManager.GPS_PROVIDER;
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
criteria.setAltitudeRequired(false);
criteria.setBearingRequired(false);
criteria.setCostAllowed(true);
criteria.setPowerRequirement(Criteria.POWER_LOW);
String provider = locationManager.getBestProvider(criteria, true);
Location location = locationManager.getLastKnownLocation(provider);
preTime=System.currentTimeMillis();
updateWithNewLocation(location);
locationManager.requestLocationUpdates(provider, step, 10,
locationListener);
}
public void stopLocationService(){
if(locationManager!=null){
locationManager.removeUpdates(locationListener);
}
}
private final LocationListener locationListener = new LocationListener() {
public void onLocationChanged(Location location) {
updateWithNewLocation(location);
}
public void onProviderDisabled(String provider) {
updateWithNewLocation(null);
}
public void onProviderEnabled(String provider) {
}
public void onStatusChanged(String provider, int status, Bundle extras) {
}
};
private void updateWithNewLocation(Location location) {
String latLongString;
TextView myLocationText;
myLocationText = (TextView) findViewById(R.id.result);
if (location != null) {
double lat = location.getLatitude();
double lng = location.getLongitude();
long subTime=(System.currentTimeMillis()-preTime)/1000;
float v=(subTime==0||preLocation==null)?0:(preLocation.distanceTo(location)/subTime);
latLongString = "纬度:" + lat + " 经度:" + lng + " 速度:"+v+" m/s , "+v*3.6+" km/h";
preLocation=location;
preTime=System.currentTimeMillis();
} else {
latLongString = "无法获取地理信息";
}
myLocationText.setText(System.currentTimeMillis()+": "+latLongString);
}
}
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