我的 Android 应用程序有问题。我使用这个类:
package com.example.seadog.gps;
import android.app.AlertDialog;
import android.app.Service;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.IBinder;
import android.provider.Settings;
import org.json.JSONObject;
public class GPSTracker extends Service implements LocationListener {
private Context mContext;
public GPSTracker() {
}
boolean isGPSEnabled = false;
boolean isNetworkEnabled = false;
boolean canGetLocation = false;
Location location;
double latitude;
double longitude;
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10;
private static final long MIN_TIME_BW_UPDATES = 5000;
protected LocationManager locationManager;
public GPSTracker(Context context) {
this.mContext = context;
getLocation();
}
public Location getLocation() {
try {
locationManager = (LocationManager) mContext.getSystemService(LOCATION_SERVICE);
isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
isNetworkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (!isGPSEnabled && !isNetworkEnabled) {
} else {
this.canGetLocation = true;
if (isNetworkEnabled) {
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
if (locationManager != null) {
location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
if (isGPSEnabled) {
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();
}
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
return location;
}
public void stopUsingGPS(){
if(locationManager != null){
locationManager.removeUpdates(GPSTracker.this);
}
}
public double getLatitude(){
if(location != null){
latitude = location.getLatitude();
}
return latitude;
}
public double getLongitude(){
if(location != null){
longitude = location.getLongitude();
}
return longitude;
}
public boolean canGetLocation() {
return this.canGetLocation;
}
public void showSettingsAlert() {
AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);
alertDialog.setTitle("GPS jest wyłączony");
alertDialog.setMessage("Do używania tej aplikacji wymagany jest GPS. W tym celu przejdź do ustawień, włącz GPS a następnie uruchom ponownie.");
alertDialog.setPositiveButton("Ustawienia", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int which) {
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
mContext.startActivity(intent);
System.exit(0);
}
});
alertDialog.setNegativeButton("Anuluj", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
System.exit(0);
}
});
alertDialog.show();
}
@Override
public void onLocationChanged(Location location) {
int ID = GlobalConfig.ID;
int Random = GlobalConfig.Random;
double latitude = location.getLatitude();
double longitude = location.getLongitude();
try {
JSONObject json = new JSONObject();
json.put("ID", ID);
json.put("Random", Random);
json.put("latitude", latitude);
json.put("longitude", longitude);
GlobalConfig config = new GlobalConfig();
config.set(json);
//config.i(0);
} catch(Exception e){
e.printStackTrace();
}
}
@Override
public void onProviderDisabled(String provider) {
System.exit(0);
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public IBinder onBind(Intent arg0) {
return null;
}
}
本类(class)摘自网络。我在 OnChangedLocation 中添加了自己的代码。当坐标发生变化时，然后在 GlobalConfig 类中创建一个具有新纬度和经度的 JSONObject。 在另一个类中有一个服务，它在后台每 5 秒向服务器发送一次数据。 我的问题是纬度和经度不正确。有时获得的值(value)是正确的，有时则不是。该位置在大约 10 分钟或几分钟内保持不变，并在一段时间后显示正确的值。 我的应用程序在后台运行。在浏览器上，我在谷歌地图上进行了预览，我的标记跳到了 map 上。我在开车时测试了它。
出了点问题。我想获得正确的纬度和经度。帮助!
最佳答案
您应该使用最后一个 Google API 来定位。首先，您像这样连接此 API:
GoogleApiClient googleApiClient = new GoogleApiClient.Builder(this)
.addApi(LocationServices.API)
.addConnectionCallbacks(locationClientCallback)
.addOnConnectionFailedListener(locationClientCallback)
.build();
if (!(googleApiClient.isConnected() || googleApiClient.isConnecting())) {
googleApiClient.connect();
}
现在，无论 API 是否连接，您都会在 locationClientCallback 中收到。
private class LocationClientCallback implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener, LocationListener {
@Override
public void onLocationChanged(Location location) {
if (location == null) {
return;
}
// YOU HAVE YOUR POSITION
}
@Override
public void onConnectionFailed(ConnectionResult arg0) {
// CONNECTION FAILED
}
@Override
public void onConnected(Bundle arg0) {
// GOOGLE API CONNECTED
// MAKE A REQUEST FOR LOCATIONS
LocationRequest request = LocationRequest.create();
request.setSmallestDisplacement(0);
request.setInterval(5000);
request.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
LocationServices.FusedLocationApi.requestLocationUpdates(googleApiClient, request, this);
}
@Override
public void onConnectionSuspended(int i) {
// CONNECTION SUSPENDED
}
}
并且在回调中您会收到位置和其他事件。在 onConnected 事件中，您应该向 Google API 客户端请求位置。
希望对你有帮助!!
关于java - 我怎样才能得到当前位置，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/34038409/