关于android：点击默认提供商的按钮获取位置

Get location on click of a button with default provider

本问题已经有最佳答案，请猛点这里访问。

我需要在点击按钮时使用NETWORK_PROVIDER获取当前位置。如果网络不可用，我想使用GPS_PROVIDER获取位置。我怎样才能做到这一点？

这是我在我的情况下做的事情：

MyLocation类：

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import android.app.ProgressDialog;
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.Looper;

public class MyLocation {
// Timer timer1;
LocationManager lm;
LocationResult locationResult;
boolean gps_enabled=false;
boolean network_enabled=false;
AsyncTask<Context, Void, Void> mtask;

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);
mtask= new GetLastLocation().execute();
return true;
}

LocationListener locationListenerGps = new LocationListener() {
public void onLocationChanged(Location location) {
// timer1.cancel();
mtask.cancel(true);
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) {
mtask.cancel(true);
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) {}
};

private Context mContext;
public MyLocation(Context c) { this.mContext = c; }

class GetLastLocation extends AsyncTask<Context, Void, Void>
{

ProgressDialog dialog = new ProgressDialog(mContext);

protected void onPreExecute()
{
dialog.setMessage("Searching....");
dialog.show();
}

protected Void doInBackground(Context... params)
{
Handler mHandler = new Handler(Looper.getMainLooper());

// ...
mHandler.post(new Runnable() {
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);
}
});
// ...

return null;
}

protected void onPostExecute(final Void unused)
{
dialog.dismiss();
}
}

public static abstract class LocationResult{
public abstract void gotLocation(Location location);
}
}

按钮点击的方法：

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MyLocation myLocation = new MyLocation();
private void locationClick() {
myLocation.getLocation(this, locationResult));
}

public LocationResult locationResult = new LocationResult(){
@Override
public void gotLocation(final Location location){
//Got the location!
});
}
};

我在stackoverflow中发现了这个问题，当时我正在寻找类似问题的解决方案......

您已使用此方法检查所有启用提供程序

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void requestLocationUpdates()
{
locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
List<String> enabledProviders = this.locationManager.getProviders(true);
for (String provider:enabledProviders){
Log.i(">>>>>>>","Requesting location updates from provider" + provider);
this.locationManager.requestLocationUpdates(provider, 10000l, 10, this);
}
}

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LocationManager locMgr = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
LocationListener locListner = new LocationListener() {

public void onProviderEnabled(String provider) {

}

public void onProviderDisabled(String provider) {

}

public void onLocationChanged(Location location) {

// CODE TO READ LOCATION

}

public void onStatusChanged(String provider, int status,
Bundle extras) {
// TODO Auto-generated method stub

}
};

// ON Click of button do this request.
locMgr.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locListner);

您还需要在清单文件中添加权限

1	<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>

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