当我运行此代码时，它在我点击button_currentlocation后给出当前位置。但是当我检查准确度时，它的准确度非常低（有时候是5000米）。但我需要以高精度（大约10米）获得当前位置一次 如果有人可以帮助我纠正我的编码，那将对我的研究有很大的帮助。
我的措辞如下
在我的清单
中 uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"
LocationProvider Class
public class LocationProvider implements
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener,
LocationListener {
public abstract interface LocationCallback {
public void handleNewLocation(Location location);
}
public static final String TAG = LocationProvider.class.getSimpleName();
/*
* Define a request code to send to Google Play services
* This code is returned in Activity.onActivityResult
*/
private final static int CONNECTION_FAILURE_RESOLUTION_REQUEST = 9000;
private LocationCallback mLocationCallback;
private Context mContext;
private GoogleApiClient mGoogleApiClient;
private LocationRequest mLocationRequest;
public LocationProvider(Context context, LocationCallback callback) {
mGoogleApiClient = new GoogleApiClient.Builder(context)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
mLocationCallback = callback;
// Create the LocationRequest object
mLocationRequest = LocationRequest.create()
.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY)
.setInterval(10 * 1000) // 10 seconds, in milliseconds
.setFastestInterval(1 * 1000); // 1 second, in milliseconds
mContext = context;
}
public void connect() {
mGoogleApiClient.connect();
}
public void disconnect() {
if (mGoogleApiClient.isConnected()) {
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
mGoogleApiClient.disconnect();
}
}
@Override
public void onConnected(Bundle bundle) {
Log.i(TAG, "Location services connected.");
Location location = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
if (location == null) {
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
}
else {
mLocationCallback.handleNewLocation(location);
}
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
/*
* Google Play services can resolve some errors it detects.
* If the error has a resolution, try sending an Intent to
* start a Google Play services activity that can resolve
* error.
*/
if (connectionResult.hasResolution() && mContext instanceof Activity) {
try {
Activity activity = (Activity)mContext;
// Start an Activity that tries to resolve the error
connectionResult.startResolutionForResult(activity, CONNECTION_FAILURE_RESOLUTION_REQUEST);
/*
* Thrown if Google Play services canceled the original
* PendingIntent
*/
} catch (IntentSender.SendIntentException e) {
// Log the error
e.printStackTrace();
}
} else {
/*
* If no resolution is available, display a dialog to the
* user with the error.
*/
Log.i(TAG, "Location services connection failed with code " + connectionResult.getErrorCode());
}
}
@Override
public void onLocationChanged(Location location) {
mLocationCallback.handleNewLocation(location);
}
}
在HomePage类
package com.ksfr.finaltest01;
import android.app.Activity;
import android.location.Location;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.util.Log;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Spinner;
import android.widget.Toast;
import com.google.android.gms.maps.model.LatLng;
public class HomePage extends Activity implements AdapterView.OnItemSelectedListener,LocationProvider.LocationCallback {
public static final String TAG = HomePage.class.getSimpleName();
Button button_disFinder;
private LocationProvider locationProvider;
String Provider,Str_endLocation;
double cur_latitude, cur_longitude,cur_accuracy, end_latitude, end_longitude;
float distance_cur_to_end;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home_page);
locationProvider = new LocationProvider(this,this);
Spinner spinner = (Spinner) findViewById(R.id.spinner_schools);
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this,
R.array.school_array, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);
spinner.setOnItemSelectedListener(this);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
}
public void CurrentLocationClicked(View view) {
if (cur_latitude!=0&&cur_longitude != 0 ){
Spinner spinner = (Spinner) findViewById(R.id.spinner_schools);
spinner.setClickable(true);
String message= String.format("Current Location\n" + "Latitude :" + cur_latitude + "\nLongitude :" + cur_longitude+"\nAccuracy :"+cur_accuracy+"\nProvider :"+Provider);
Toast.makeText(HomePage.this, message, Toast.LENGTH_LONG).show();
}
else{
String message= String.format("Location services disconnected.\nSwich ON Location Service to work App.");
Toast.makeText(HomePage.this, message, Toast.LENGTH_LONG).show();
//System.exit(0);
}
}
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
if(position!= 0) {
Str_endLocation=String.valueOf(parent.getItemAtPosition(position));
Toast.makeText(getApplicationContext(), Str_endLocation + " Selected", Toast.LENGTH_SHORT).show();
switch (Str_endLocation){
//end location latitude and logitude will be taken from here.
case "Kahagolla National School":
end_latitude = 6.816703;end_longitude = 80.9637076;
break;
}
String message3= String.format("End Location\n"+"Latitude :"+end_latitude+"\nLongitude :"+end_longitude);//For Testing
Toast.makeText(HomePage.this, message3, Toast.LENGTH_LONG).show();//For Testing
}
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
public void FindDistanceClicked (View view){
Location curlocation = new Location("");
curlocation.setLatitude(cur_latitude);
curlocation.setLongitude(cur_longitude);
Location endlocation = new Location("");
endlocation.setLatitude(end_latitude);
endlocation.setLongitude(end_longitude);
distance_cur_to_end = curlocation.distanceTo(endlocation)/1000;
String message5= String.format("Distance from current location to\n" + Str_endLocation + " :" + String.format("%.3g%n", distance_cur_to_end)+"km");//For testing
Toast.makeText(HomePage.this, message5, Toast.LENGTH_LONG).show();//For testing
}
public void handleNewLocation(Location location) {
Log.d(TAG, location.toString());
cur_latitude = location.getLatitude();
cur_longitude = location.getLongitude();
cur_accuracy = location.getAccuracy();
Provider = location.getProvider();
LatLng cur_latLng = new LatLng(cur_latitude, cur_longitude);
}
@Override
protected void onResume() {
super.onResume();
locationProvider.connect();
}
@Override
protected void onPause() {
super.onPause();
locationProvider.disconnect();
}
public void ClearClicked (View view){
}
}
答案 0 :(得分：0)
尝试撤消onConnected方法位置代码。 首先尝试获取当前位置，如果不可用，请尝试获取lastKnown位置。 像这样的事情
if(location == null) {
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
if(locationManager != null) {
location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if(location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
答案 1 :(得分：0)
我最后纠正了我的问题， 从这个方法我得到3米准确度的位置，我想要。
这是代码 DistanceFinderActivity.java
private static final long MINIMUM_DISTANCE_CHANGE_FOR_UPDATES = 1; // in Meters
private static final long MINIMUM_TIME_BETWEEN_UPDATES = 5*1000; // in Milliseconds
protected LocationManager locationManager;
double cur_latitude, cur_longitude,cur_accuracy, end_latitude, end_longitude;
float distance_cur_to_end;
public LatLng cur_latLng,end_latLng;
MyLocationListener myLocationListener =new MyLocationListener();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_distance_finder);
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
locationManager.requestLocationUpdates(
GPS_PROVIDER,
MINIMUM_TIME_BETWEEN_UPDATES,
MINIMUM_DISTANCE_CHANGE_FOR_UPDATES,
myLocationListener
);
//......
}
protected void showCurrentLocation() {
Location location = locationManager.getLastKnownLocation(GPS_PROVIDER);
if (location != null) {
cur_latitude = location.getLatitude();
cur_longitude = location.getLongitude();
cur_accuracy = location.getAccuracy();
Provider = location.getProvider();
DecimalFormat df = new DecimalFormat("#.###");
df.setMinimumFractionDigits(2);
String message = String.format(
"Current Location \nLatitude: %1$s\nLongitude: %2$s\nAccuracy: %3$s\n" +
" Provider: %4$s\nWait until new location capture",
cur_latitude, cur_longitude,String.valueOf(df.format(cur_accuracy)),Provider.toUpperCase()
);
Toast.makeText(MainDistanceFinderActivity.this, message,
Toast.LENGTH_LONG).show();
}
}
private class MyLocationListener implements LocationListener {
public void onLocationChanged(Location location) {
cur_latitude = location.getLatitude();
cur_longitude = location.getLongitude();
cur_accuracy = location.getAccuracy();
Provider = location.getProvider();
DecimalFormat df = new DecimalFormat("#.###");
df.setMinimumFractionDigits(2);
String message = String.format(
"New Location Captured. \nLatitude: %1$s\nLongitude: %2$s\nAccuracy: %3$s\n" +
" Provider: %4$s",
cur_latitude, cur_longitude,String.valueOf(df.format(cur_accuracy)), Provider.toUpperCase()
);
Toast.makeText(MainDistanceFinderActivity.this, message, Toast.LENGTH_LONG).show();
}
public void onStatusChanged(String s, int i, Bundle b) {
Toast.makeText(MainDistanceFinderActivity.this, "Provider status changed",
Toast.LENGTH_LONG).show();
}
public void onProviderDisabled(String s) {
Toast.makeText(MainDistanceFinderActivity.this,
"Provider disabled by the user. GPS turned off",
Toast.LENGTH_LONG).show();
}
public void onProviderEnabled(String s) {
Toast.makeText(MainDistanceFinderActivity.this,
"Provider enabled by the user. GPS turned on",
Toast.LENGTH_LONG).show();
}
}