我正试图从GPS获取位置但无法获得它。这是因为网络提供商访问了该位置。
如果我正在评论网络提供商的所有代码，那么GPS位置将返回null。
我已经尝试过这么多，但无法解决这个问题。
如果有人可以提供帮助，那对我来说将是很有帮助的。
我正在使用此链接作为参考..
https://stackoverflow.com/a/3145655/1395259
这是我的代码：
MainActivity.java
package com.example.locationsimple;
import com.example.locationsimple.MyLocation.LocationResult;
import android.location.Location;
import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity {
TextView textView;
LocationResult locationResult;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textView = (TextView) findViewById(R.id.textViewLocation);
Button button = (Button) findViewById(R.id.button);
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
locationResult = new LocationResult(){
@Override
public void gotLocation(Location location) {
while(true)
{
Log.i("Log", "Inside while loop ");
if(location != null)
{
Log.i("Log", "Here the location is not null");
if(location.getLatitude() !=0.0 || location.getLongitude() != 0.0)
{
if(location.getAccuracy() < 100)
{
Log.i("Log", "Inside while loop BREAKS");
try
{
String loc = "Lattitude: "+location.getLatitude()+" longi "+location.getLongitude()+" Accur "+location.getAccuracy()+" Time "+location.getTime();
Log.i("Log",loc);
Toast.makeText(MainActivity.this, ""+loc, Toast.LENGTH_LONG).show();
textView.setText(loc);
}
catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
break;
}
else
{
Log.i("Log", "no Accuracy");
Log.i("Log", "latti"+location.getLatitude()+" Longi "+location.getLongitude()+" Accur "+location.getAccuracy()+location.getProvider());
break;
}
}
}
else
{
Log.i("Log", "Here got the location is null");
break;
}
}
//textView.setText(location.getLatitude()+"::"+location.getLongitude()+"::"+location.getAccuracy()+" Provider "+location.getProvider());
}
};
MyLocation myLocation = new MyLocation();
myLocation.getLocation(MainActivity.this, locationResult);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
MyLocation.java
package com.example.locationsimple;
import java.util.Timer;
import java.util.TimerTask;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.provider.Settings;
public class MyLocation {
Timer timer1;
LocationManager lm;
LocationResult locationResult;
boolean gps_enabled=false;
boolean network_enabled=false;
Context mContext;
public boolean getLocation(Context context, LocationResult result)
{
mContext = context;
//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);
/*Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_HIGH);
lm.getBestProvider(criteria, true);*/
//exceptions will be thrown if provider is not permitted.
try
{
gps_enabled=lm.isProviderEnabled(LocationManager.GPS_PROVIDER);
}
catch(Exception ex)
{
ex.printStackTrace();
}
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)
{
showSettingsAlert();
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(), 30000);
return true;
}
public void showSettingsAlert(){
AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);
alertDialog.setCancelable(false);
// Setting Dialog Title
alertDialog.setTitle("GPS Is Not Enabled");
// Setting Dialog Message
alertDialog.setMessage("Please Enabled Wireless Network And GPS");
// On pressing Settings button
alertDialog.setNeutralButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int which) {
dialog.cancel();
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
mContext.startActivity(intent);
}
});
// Showing Alert Message
alertDialog.show();
}
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;
Location 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);
}
}
谢谢..
答案 0 :(得分：0)
您可以使用以下服务获取gps.just在开始时调用此服务。
公共类MyService扩展了Service {
LocationManager locationManager;
@Override
public void onCreate() {
//
// TODO Auto-generated method stub
String context = Context.LOCATION_SERVICE;
locationManager = (LocationManager) getSystemService(context);
/** Criteria for selecting best provider */
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
criteria.setAltitudeRequired(false);
criteria.setBearingRequired(false);
criteria.setCostAllowed(true);
criteria.setPowerRequirement(Criteria.POWER_LOW);
/** Passing criteria and select only enabled provider */
String provider = locationManager.getBestProvider(criteria, true);
Location location = locationManager.getLastKnownLocation(provider);
/** calls the Location Listner */
locationManager.requestLocationUpdates(provider, 500, 0,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)
{
System.out.println("+++++++++++++++++++SASI+++++++++++++++++++++++++++++++++++++++++");
String latLongString, addressString = null;
double lat = 0, lng = 0;
if (location != null) {
lat = location.getLatitude();
lng = location.getLongitude();
//latLongString = "Lat:" + lat + "\nLong: " + lng;
/** Getting Address */
} else {
latLongString = "No location found";
addressString = "No location found";
}
//System.out.println("@@@@@@@@@@@" + addressString + lat + lng);
SearchDeals.latPoint=location.getLatitude();
SearchDeals.lngPoint=location.getLongitude();
Deals_route.sourcelati=location.getLatitude();
Deals_route.sourcelong=location.getLongitude();
}
@Override
public void onDestroy() {
super.onDestroy();
//
//Toast.makeText(this, "GPS Service Destroyed", Toast.LENGTH_LONG).show();
locationManager.removeUpdates(locationListener);
System.out.println("@@@@@@@@@@@ inside ONDESTROY GPS listener removed");
}
@Override
public int onStartCommand(Intent intent, int flags, int startId)
{
//
Log.v("StartServiceAtBoot", "StartAtBootService -- onStartCommand()");
//Toast.makeText(this, "Service started", Toast.LENGTH_LONG).show();
// We want this service to continue running until it is explicitly
// stopped, so return sticky.
return START_STICKY;
}
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
}
答案 1 :(得分：0)
我刚刚在我的设备上测试了上述代码，一切运行顺利，不确定到底是什么问题。
重要说明：
<uses-permission
android:name="android.permission.ACCESS_FINE_LOCATION"/>
修改
您需要提交与网络提供商相关的位置数据。
并且还从LocationResult对象中删除textView.setText，因为textView为null。所以修复：
getLocation(Location location) {
.........
String loc = "Lattitude: "+location.getLatitude()+" longi "+location.getLongitude()+" Accur "+location.getAccuracy()+" Time "+location.getTime() +" "+location.getProvider();
Log.i("Log",loc);
Toast.makeText(MainActivity.this, loc, Toast.LENGTH_LONG).show();
}
并注释掉MyLocation班级
// if(network_enabled)
// lm.requestLocationUpdates（LocationManager.NETWORK_PROVIDER，0,0，locationListenerNetwork）;