获取Android的位置,并返回"未知"或空当供应商不可用 [英] Getting Android Location and return "unknown" or null when providers are unavailable
问题描述
我用<一个href=\"http://stackoverflow.com/questions/3145089/what-is-the-simplest-and-most-robust-way-to-get-the-users-current-location-in-an/3145655#3145655\">this由费多尔脚本但我想有点区别:当GPS和网络提供商不可用,我想应用返回null或未知字符串。我修改剧本,但是当我运行,它强制关闭时,logcat的说:
I'm using this script by Fedor but I want a little difference: When both GPS and Network Provider is unavailable, I want to app to return null or "unknown" string. I modified the script, but when I run, it force closes, the logcat says:
我有以下的codeS:
I have the following codes:
MyLocation.java
package com.example.GetALocation2;
import java.util.Timer;
import java.util.TimerTask;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
public class MyLocation {
Timer timer1;
LocationManager lm;
LocationResult locationResult;
boolean gps_enabled=false;
boolean network_enabled=false;
public boolean getLocation(Context context, LocationResult result)
{
//I use LocationResult callback class to pass location value from MyLocation to user code.
locationResult=result;
if(lm==null)
lm = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
//exceptions will be thrown if provider is not permitted.
try{gps_enabled=lm.isProviderEnabled(LocationManager.GPS_PROVIDER);}catch(Exception ex){}
try{network_enabled=lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER);}catch(Exception ex){}
//don't start listeners if no provider is enabled
if(!gps_enabled && !network_enabled)
return false;
if(gps_enabled)
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListenerGps);
if(network_enabled)
lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListenerNetwork);
timer1=new Timer();
timer1.schedule(new GetLastLocation(), 20000);
return true;
}
LocationListener locationListenerGps = new LocationListener() {
public void onLocationChanged(Location location) {
timer1.cancel();
locationResult.gotLocation(location);
lm.removeUpdates(this);
lm.removeUpdates(locationListenerNetwork);
}
public void onProviderDisabled(String provider) {}
public void onProviderEnabled(String provider) {}
public void onStatusChanged(String provider, int status, Bundle extras) {}
};
LocationListener locationListenerNetwork = new LocationListener() {
public void onLocationChanged(Location location) {
timer1.cancel();
locationResult.gotLocation(location);
lm.removeUpdates(this);
lm.removeUpdates(locationListenerGps);
}
public void onProviderDisabled(String provider) {}
public void onProviderEnabled(String provider) {}
public void onStatusChanged(String provider, int status, Bundle extras) {}
};
class GetLastLocation extends TimerTask {
@Override
public void run() {
lm.removeUpdates(locationListenerGps);
lm.removeUpdates(locationListenerNetwork);
/*
Location net_loc=null, gps_loc=null;
if(gps_enabled)
gps_loc=lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if(network_enabled)
net_loc=lm.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
//if there are both values use the latest one
if(gps_loc!=null && net_loc!=null){
if(gps_loc.getTime()>net_loc.getTime())
locationResult.gotLocation(gps_loc);
else
locationResult.gotLocation(net_loc);
return;
}
if(gps_loc!=null){
locationResult.gotLocation(gps_loc);
return;
}
if(net_loc!=null){
locationResult.gotLocation(net_loc);
return;
}
*/
locationResult.gotLocation( null );
}
}
public static abstract class LocationResult{
public abstract void gotLocation(Location location);
}
}
GetALocation2.java
package com.example.GetALocation2;
import com.example.GetALocation2.MyLocation.LocationResult;
import android.app.Activity;
import android.location.Location;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;
public class GetALocation2 extends Activity {
Double latitude;
TextView tv;
MyLocation myLocation = new MyLocation();
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Toast.makeText(getBaseContext(), "This is the start!", Toast.LENGTH_SHORT).show();
locationClick();
}
private void locationClick() {
myLocation.getLocation(this, locationResult);
}
public LocationResult locationResult = new LocationResult(){
@Override
public void gotLocation(final Location location){
//Got the location!
if( location == null ){
Toast.makeText(getBaseContext(), "Location is unknown.", Toast.LENGTH_SHORT).show();
}else{
GetALocation2.this.latitude = location.getLatitude();
Toast.makeText(getBaseContext(), "I got the location! >>> " + location.getLatitude(), Toast.LENGTH_SHORT).show();
}
};
};
}
我有点对Java和Android,任何帮助非常感谢! :)
I'm kinda new to java and android, many thanks for any help! :)
推荐答案
希望这有助于:
private LocationManager lm;
private LocationListener ll;
public static String latitude;
public static String longitude;
double lat,lon;
lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
if(lm.isProviderEnabled(LocationManager.GPS_PROVIDER)){
// Toast.makeText(this,"GPS PROVIDER", Toast.LENGTH_LONG).show();
ll = new GpsListener();
//lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 100, 0,ll);
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER,0,0, ll);
}else if(lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER)){
// Toast.makeText(this,"NETWORK PROVIDER.", Toast.LENGTH_LONG).show();
ll = new GpsListener();
lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0,0, ll);
}else{
Toast.makeText(this,"GPS is disabled.", Toast.LENGTH_LONG).show();
prog.dismiss();
}
添加上述code在onCreate方法
Add the above code in your OnCreate method
和出onCreate方法的创建下面的类
and out of the onCreate method create a following class
private class GpsListener implements LocationListener
{
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
float acc=-1;
if(location!=null) {
Toast.makeText(HomeScreen.hs,"Location Found", Toast.LENGTH_LONG).show();
System.out.println("IN IF PART");
if(location.hasAccuracy())
acc = location.getAccuracy();
lat = location.getLatitude();
lon = location.getLongitude();
isLocFound=true;
latitude = Double.toString(lat);
longitude = Double.toString(lon);
System.out.println("1)"+acc+" 2) "+latitude+" 3) "+longitude);
lm.removeUpdates(ll);
lm = null;
stopSelf();
//stopForeground(true);
}else{
Toast.makeText(HomeScreen.hs,"No Location Found", Toast.LENGTH_LONG).show();
System.out.println("IN ELSE PART..");
}
prog.dismiss();
}
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
}//end of Class
希望这helpss
Hope this helpss
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