当检索一个真正的Android手机上运行的GPS坐标不工作坐标、机上、工作、Andr
2023-09-08 08:49:56
作者：闹够了就滚
我的计划应该能够：
更改地图放大到手机的当前位置添加标记显示纬度的警报和经度值当我使用GPS_PROVIDER，功能1-4作品在我的模拟器（因为我手动给它一个经度和纬度值）。但是，当我创建了一个APK文件，2-4功能不起作用。
When I use GPS_PROVIDER, functions 1-4 works in my emulator (because I manually feed it a latitude and longitude values). But when I created an apk file, 2-4 functions don't work.
下面是我的课。
package com.locator.map;
import java.text.DecimalFormat;
import java.util.List;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.graphics.drawable.Drawable;
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.Toast;
import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapController;
import com.google.android.maps.MapView;
import com.google.android.maps.Overlay;
import com.google.android.maps.OverlayItem;
public class Main extends MapActivity
{
MapController controller;
double currentLat;
double currentLon;
LocationManager manager;
boolean locationChanged = false;
Button retrieveLocationButton, toggleViewButton;
boolean streetview = false;
Drawable d;
List<Overlay> overlaylist;
MapView map;
Criteria criteria;
String bestProvider;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
map = (MapView) findViewById (R.id.googleMap);
map.setBuiltInZoomControls(true);
map.setSatellite(true);
controller = map.getController();
criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
manager = (LocationManager) this.getSystemService (Context.LOCATION_SERVICE);
bestProvider = manager.getBestProvider(criteria, true);
retrieveLocationButton = (Button) findViewById(R.id.retrieveLocation);
toggleViewButton = (Button) findViewById(R.id.changeView);
retrieveLocationButton.setOnClickListener(new OnClickListener()
{
public void onClick(View v)
{
showCurrentLocation();
}
});
toggleViewButton.setOnClickListener(new OnClickListener()
{
public void onClick(View v)
{
if (streetview == false)
{
map.setSatellite(false);
map.setStreetView(true);
streetview=true;
}
else if (streetview == true)
{
map.setStreetView(false);
map.setSatellite(true);
streetview=false;
}
}
});
LocationListener listener = new LocationListener()
{
public void onLocationChanged(Location location)
{
// TODO Auto-generated method stub
//Retrieve the current GPS coordinates
currentLat = location.getLatitude();
currentLon = location.getLongitude();
locationChanged = true;
}
public void onProviderDisabled(String provider)
{
// TODO Auto-generated method stub
Toast.makeText(getBaseContext(), "Your GPS services are not activated.", Toast.LENGTH_LONG).show();
}
public void onProviderEnabled(String provider)
{
// TODO Auto-generated method stub
Toast.makeText(getBaseContext(), "Your GPS services are now activated.", Toast.LENGTH_LONG).show();
}
public void onStatusChanged(String provider, int status, Bundle extras)
{
// TODO Auto-generated method stub
Toast.makeText(getBaseContext(), "Your GPS service provider is changed.", Toast.LENGTH_LONG).show();
}
};
manager.requestLocationUpdates(bestProvider, 1000, 1, listener); //--> To update current location (coordinates [latitude & longitude]).
}
protected void showCurrentLocation()
{
// TODO Auto-generated method stub
//If location is changed or updated - Zoom in to current location, add a marker and show a dialog with current coordinates.
if (locationChanged == true)
{
//Set the map's view and zoom level animation
GeoPoint currentLocation = new GeoPoint ((int) (currentLat * 1E6), (int) (currentLon * 1E6));
controller.setCenter(currentLocation);
controller.setZoom(15);
//Show the current coordinates (Convert to String and round off - 6 decimal places)
String printLat = new DecimalFormat("0.######").format((double)currentLat);
String printLon = new DecimalFormat("0.######").format((double)currentLon);
AlertDialog alert = new AlertDialog.Builder(Main.this).create();
alert.setTitle("Current Location:");
alert.setMessage("Latitude: " + printLat + "\n" + "Longitude: " + printLon);
alert.setButton("Close", new DialogInterface.OnClickListener()
{
public void onClick(DialogInterface arg0, int arg1)
{
// TODO Auto-generated method stub
//Alert Dialog won't work without a listener
//Do nothing (This will simply close your alert dialog)
}
});
alert.show();
//Add a marker
overlaylist = map.getOverlays();
d = getResources().getDrawable(R.drawable.ic_launcher);
CustomPinpoint marker = new CustomPinpoint (d, Main.this);
OverlayItem overlayitem = new OverlayItem (currentLocation, "1st String", "2nd String");
marker.insertPinpoint(overlayitem);
overlaylist.add(marker);
}
}
@Override
protected boolean isRouteDisplayed()
{
// TODO Auto-generated method stub
return false;
}
}
我也使用NETWORK_PROVIDER尝试。一切工作在我的手机，但它没有返回准确的经度和纬度值。它添加了标记，但它约1公里，距我的实际位置。
I also tried using NETWORK_PROVIDER. Everything works in my phone but it's not returning accurate latitude and longitude values. It adds marker but it's about 1 kilometer away from my actual location.
下面是我用类NETWORK_PROVIDER：
Here's my class using NETWORK_PROVIDER:
package com.locator.map;
import java.text.DecimalFormat;
import java.util.List;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.graphics.drawable.Drawable;
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.Toast;
import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapController;
import com.google.android.maps.MapView;
import com.google.android.maps.Overlay;
import com.google.android.maps.OverlayItem;
public class Main extends MapActivity
{
MapController controller;
double currentLat;
double currentLon;
LocationManager manager;
boolean locationChanged = false;
Button retrieveLocationButton, toggleViewButton;
boolean streetview = false;
Drawable d;
List<Overlay> overlaylist;
MapView map;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
map = (MapView) findViewById (R.id.googleMap);
map.setBuiltInZoomControls(true);
map.setSatellite(true);
controller = map.getController();
manager = (LocationManager) this.getSystemService (Context.LOCATION_SERVICE);
retrieveLocationButton = (Button) findViewById(R.id.retrieveLocation);
toggleViewButton = (Button) findViewById(R.id.changeView);
retrieveLocationButton.setOnClickListener(new OnClickListener()
{
public void onClick(View v)
{
showCurrentLocation();
}
});
toggleViewButton.setOnClickListener(new OnClickListener()
{
public void onClick(View v)
{
if (streetview == false)
{
map.setSatellite(false);
map.setStreetView(true);
streetview=true;
}
else if (streetview == true)
{
map.setStreetView(false);
map.setSatellite(true);
streetview=false;
}
}
});
LocationListener listener = new LocationListener()
{
public void onLocationChanged(Location location)
{
// TODO Auto-generated method stub
//Retrieve the current GPS coordinates
currentLat = location.getLatitude();
currentLon = location.getLongitude();
locationChanged = true;
}
public void onProviderDisabled(String provider)
{
// TODO Auto-generated method stub
Toast.makeText(getBaseContext(), "Your GPS services are not activated.", Toast.LENGTH_LONG).show();
}
public void onProviderEnabled(String provider)
{
// TODO Auto-generated method stub
Toast.makeText(getBaseContext(), "Your GPS services are now activated.", Toast.LENGTH_LONG).show();
}
public void onStatusChanged(String provider, int status, Bundle extras)
{
// TODO Auto-generated method stub
Toast.makeText(getBaseContext(), "Your GPS service provider is changed.", Toast.LENGTH_LONG).show();
}
};
manager.requestLocationUpdates(NETWORK_PROVIDER, 1000, 1, listener); //--> To update current location (coordinates [latitude & longitude]).
}
protected void showCurrentLocation()
{
// TODO Auto-generated method stub
//If location is changed or updated - Zoom in to current location, add a marker and show a dialog with current coordinates.
if (locationChanged == true)
{
//Set the map's view and zoom level animation
GeoPoint currentLocation = new GeoPoint ((int) (currentLat * 1E6), (int) (currentLon * 1E6));
controller.setCenter(currentLocation);
controller.setZoom(15);
//Show the current coordinates (Convert to String and round off - 6 decimal places)
String printLat = new DecimalFormat("0.######").format((double)currentLat);
String printLon = new DecimalFormat("0.######").format((double)currentLon);
AlertDialog alert = new AlertDialog.Builder(Main.this).create();
alert.setTitle("Current Location:");
alert.setMessage("Latitude: " + printLat + "\n" + "Longitude: " + printLon);
alert.setButton("Close", new DialogInterface.OnClickListener()
{
public void onClick(DialogInterface arg0, int arg1)
{
// TODO Auto-generated method stub
//Alert Dialog won't work without a listener
//Do nothing (This will simply close your alert dialog)
}
});
alert.show();
//Add a marker
overlaylist = map.getOverlays();
d = getResources().getDrawable(R.drawable.ic_launcher);
CustomPinpoint marker = new CustomPinpoint (d, Main.this);
OverlayItem overlayitem = new OverlayItem (currentLocation, "1st String", "2nd String");
marker.insertPinpoint(overlayitem);
overlaylist.add(marker);
}
}
@Override
protected boolean isRouteDisplayed()
{
// TODO Auto-generated method stub
return false;
}
}
下面是我的清单：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.locator.map"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="8" android:targetSdkVersion="8"/>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<application android:icon="@drawable/ic_launcher" android:label="Locator" >
<uses-library android:name="com.google.android.maps" />
<activity
android:name=".Main"
android:label="Locator" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
我认为，全球定位系统是在我区在这里工作，谷歌地图应用程序返回时，我用它准确的定位。我试着用我在同一个位置，我用谷歌地图应用程序（包括NETWORK_PROVIDER和GPS_PROVIDER）：
I think, GPS is working here in my area, Google Maps application returns accurate location when I use it. I tried using my application (both NETWORK_PROVIDER and GPS_PROVIDER) in the same location where I used Google Maps:
NETWORK_PROVIDER仍返回不准确的结果。 GPS_PROVIDER仍然无法正常工作。请帮我。
推荐答案
您确定谷歌地图，因为它是者正在使用GPS？我发现，往往GMaps实现显示位置（在时间和pretty precise的！），使用从Wi-Fi和GSM antennaes唯一的数据......在这种情况下，你的code可能永远不会被调用（直到有GPS定位）。
Are you sure Google Maps is using GPS as it's provider? I find that GMaps often shows locations (and pretty precise ones at times!) using only data from Wi-Fi and GSM antennaes... In that case, your code may never be called (until there's a GPS fix).
我会尝试加入
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MINIMUM_TIME_BETWEEN_UPDATES,
MINIMUM_DISTANCE_CHANGE_FOR_UPDATES,
new MyLocationListener());
到code（以下注册获取GPS更新），只是为了检查这种可能性。
to your code (below the registration to get GPS updates), just to check that possibility.
修改
试着改变ACCURACY_FINE到ACCURACY_HIGH
Try changing ACCURACY_FINE to ACCURACY_HIGH
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