獲取當前的經緯度android

Question

要求 ：

1.有時（並非每次）我的經度和緯度均為0.0。

2.我想知道在用戶從設置中啟用gps后如何獲取位置更新。

這是我的代碼

public class GPSTracker extends Service implements LocationListener {

    private final Context mContext;

    // flag for GPS status
    boolean isGPSEnabled = false;

    // flag for network status
    boolean isNetworkEnabled = false;

    // flag for GPS status
    boolean canGetLocation = false;

    Location location; // location
    double latitude; // latitude
    double longitude; // longitude

    // The minimum distance to change Updates in meters
    private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters

    // The minimum time between updates in milliseconds
    private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute

    // Declaring a Location Manager
    protected LocationManager locationManager;

    public GPSTracker(Context context) {
        this.mContext = context;
        getLocation();
    }

    public Location getLocation() {
        try {
            locationManager = (LocationManager) mContext
                    .getSystemService(LOCATION_SERVICE);

            // getting GPS status
            isGPSEnabled = locationManager
                    .isProviderEnabled(LocationManager.GPS_PROVIDER);

            // getting network status
            isNetworkEnabled = locationManager
                    .isProviderEnabled(LocationManager.NETWORK_PROVIDER);

            if (!isGPSEnabled && !isNetworkEnabled) {
                // no network provider is enabled
            } else {
                this.canGetLocation = true;
                if (isNetworkEnabled) {
                    locationManager.requestLocationUpdates(
                            LocationManager.NETWORK_PROVIDER,
                            MIN_TIME_BW_UPDATES,
                            MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                    Log.d("Network", "Network");
                    if (locationManager != null) {
                        location = locationManager
                                .getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                        if (location != null) {
                            latitude = location.getLatitude();
                            longitude = location.getLongitude();
                        }
                    }
                }
                // if GPS Enabled get lat/long using GPS Services
                if (isGPSEnabled) {
                    if (location == null) {
                        locationManager.requestLocationUpdates(
                                LocationManager.GPS_PROVIDER,
                                MIN_TIME_BW_UPDATES,
                                MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                        Log.d("GPS Enabled", "GPS Enabled");
                        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;
    }

    /**
     * Stop using GPS listener
     * Calling this function will stop using GPS in your app
     * */
    public void stopUsingGPS(){
        if(locationManager != null){
            locationManager.removeUpdates(GPSTracker.this);
        }       
    }

    /**
     * Function to get latitude
     * */
    public double getLatitude(){
        if(location != null){
            latitude = location.getLatitude();
        }

        // return latitude
        return latitude;
    }

    /**
     * Function to get longitude
     * */
    public double getLongitude(){
        if(location != null){
            longitude = location.getLongitude();
        }

        // return longitude
        return longitude;
    }

    /**
     * Function to check GPS/wifi enabled
     * @return boolean
     * */
    public boolean canGetLocation() {
        return this.canGetLocation;
    }

    /**
     * Function to show settings alert dialog
     * On pressing Settings button will lauch Settings Options
     * */
    public void showSettingsAlert(){
        AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);

        // Setting Dialog Title
        alertDialog.setTitle("GPS is settings");

        // Setting Dialog Message
        alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");

        // On pressing Settings button
        alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog,int which) {
                Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                mContext.startActivity(intent);
            }
        });

        // on pressing cancel button
        alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
            dialog.cancel();
            }
        });

        // Showing Alert Message
        alertDialog.show();
    }

    @Override
    public void onLocationChanged(Location location) {
    }

    @Override
    public void onProviderDisabled(String provider) {
    }

    @Override
    public void onProviderEnabled(String provider) {
    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
    }

    @Override
    public IBinder onBind(Intent arg0) {
        return null;
    }

}

在我的活動課上，我這樣打電話

 gps = new GPSTracker(this);

        // check if GPS enabled
        if(gps.canGetLocation()){

            double latitude = gps.getLatitude();
            double longitude = gps.getLongitude();

            // \n is for new line
            Toast.makeText(getApplicationContext(), "Your Location is - \nLat: " + latitude + "\nLong: " + longitude, Toast.LENGTH_LONG).show();
        }else{
            // can't get location
            // GPS or Network is not enabled
            // Ask user to enable GPS/network in settings
            gps.showSettingsAlert();
        }

Answer 1

請參閱我的帖子， 網址為http://gabesechansoftware.com/location-tracking/ 。 您正在使用的代碼已損壞。 永遠不要使用它。 您看到的行為是錯誤之一-它無法處理getLastLocation返回null（預期失敗）的情況。 它是由一個知道他在做什么的人寫的，但是幾年前它受到了強烈的反對，直到今天仍在困擾着人們。

Answer 2

不要忘記將服務放在清單文件中

<service
        android:name"your package name.GPSTracker"
        android:enabled="true" >
    </service>

參考鏈接 ，請嘗試此鏈接

Answer 3

我創建了一個教程來使用位置管理器獲取當前的緯度和經度。在此處下載源代碼（ 使用后台服務獲取當前位置 ）

MainActivity.java

 package servicetutorial.service;

import android.*;
import android.app.Activity;
import android.app.ActivityManager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.SharedPreferences;
import android.content.pm.PackageManager;
import android.location.Address;
import android.location.Geocoder;
import android.preference.PreferenceManager;
import android.renderscript.Double2;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import java.io.IOException;
import java.util.List;
import java.util.Locale;

public class MainActivity extends Activity {
Button btn_start;
private static final int REQUEST_PERMISSIONS = 100;
boolean boolean_permission;
TextView tv_latitude, tv_longitude, tv_address,tv_area,tv_locality;
SharedPreferences mPref;
SharedPreferences.Editor medit;
Double latitude,longitude;
Geocoder geocoder;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    btn_start = (Button) findViewById(R.id.btn_start);
    tv_address = (TextView) findViewById(R.id.tv_address);
    tv_latitude = (TextView) findViewById(R.id.tv_latitude);
    tv_longitude = (TextView) findViewById(R.id.tv_longitude);
    tv_area = (TextView)findViewById(R.id.tv_area);
    tv_locality = (TextView)findViewById(R.id.tv_locality);
    geocoder = new Geocoder(this, Locale.getDefault());
    mPref = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
    medit = mPref.edit();


    btn_start.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (boolean_permission) {

                if (mPref.getString("service", "").matches("")) {
                    medit.putString("service", "service").commit();

                    Intent intent = new Intent(getApplicationContext(), GoogleService.class);
                    startService(intent);

                } else {
                    Toast.makeText(getApplicationContext(), "Service is already running", Toast.LENGTH_SHORT).show();
                }
            } else {
                Toast.makeText(getApplicationContext(), "Please enable the gps", Toast.LENGTH_SHORT).show();
            }

        }
    });

    fn_permission();
}

private void fn_permission() {
    if ((ContextCompat.checkSelfPermission(getApplicationContext(), android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED)) {

        if ((ActivityCompat.shouldShowRequestPermissionRationale(MainActivity.this, android.Manifest.permission.ACCESS_FINE_LOCATION))) {


        } else {
            ActivityCompat.requestPermissions(MainActivity.this, new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION

                    },
                    REQUEST_PERMISSIONS);

        }
    } else {
        boolean_permission = true;
    }
}

@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);

    switch (requestCode) {
        case REQUEST_PERMISSIONS: {
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                boolean_permission = true;

            } else {
                Toast.makeText(getApplicationContext(), "Please allow the permission", Toast.LENGTH_LONG).show();

            }
        }
    }
}

private BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {

        latitude = Double.valueOf(intent.getStringExtra("latutide"));
        longitude = Double.valueOf(intent.getStringExtra("longitude"));

        List<Address> addresses = null;

        try {
            addresses = geocoder.getFromLocation(latitude, longitude, 1);
            String cityName = addresses.get(0).getAddressLine(0);
            String stateName = addresses.get(0).getAddressLine(1);
            String countryName = addresses.get(0).getAddressLine(2);

            tv_area.setText(addresses.get(0).getAdminArea());
            tv_locality.setText(stateName);
            tv_address.setText(countryName);



        } catch (IOException e1) {
            e1.printStackTrace();
        }


        tv_latitude.setText(latitude+"");
        tv_longitude.setText(longitude+"");
        tv_address.getText();


    }
};

@Override
protected void onResume() {
    super.onResume();
    registerReceiver(broadcastReceiver, new IntentFilter(GoogleService.str_receiver));

}

@Override
protected void onPause() {
    super.onPause();
    unregisterReceiver(broadcastReceiver);
}


}

GoogleService.java

package servicetutorial.service;

import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.support.annotation.Nullable;
import android.util.Log;

import java.util.Timer;
import java.util.TimerTask;

/**

*由deepshikha創建於2016年11月24日。 * /

public class GoogleService extends Service implements LocationListener{

boolean isGPSEnable = false;
boolean isNetworkEnable = false;
double latitude,longitude;
LocationManager locationManager;
Location location;
private Handler mHandler = new Handler();
private Timer mTimer = null;
long notify_interval = 1000;
public static String str_receiver = "servicetutorial.service.receiver";
Intent intent;




public GoogleService() {

}

@Nullable
@Override
public IBinder onBind(Intent intent) {
    return null;
}

@Override
public void onCreate() {
    super.onCreate();

    mTimer = new Timer();
    mTimer.schedule(new TimerTaskToGetLocation(),5,notify_interval);
    intent = new Intent(str_receiver);

}

@Override
public void onLocationChanged(Location location) {

}

@Override
public void onStatusChanged(String provider, int status, Bundle extras) {

}

@Override
public void onProviderEnabled(String provider) {

}

@Override
public void onProviderDisabled(String provider) {

}

private void fn_getlocation(){
    locationManager = (LocationManager)getApplicationContext().getSystemService(LOCATION_SERVICE);
    isGPSEnable = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
    isNetworkEnable = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);

    if (!isGPSEnable && !isNetworkEnable){

    }else {

        if (isNetworkEnable){
            location = null;
            locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER,1000,0,this);
            if (locationManager!=null){
                location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                if (location!=null){

                    Log.e("latitude",location.getLatitude()+"");
                    Log.e("longitude",location.getLongitude()+"");

                    latitude = location.getLatitude();
                    longitude = location.getLongitude();
                    fn_update(location);
                }
            }

        }


        if (isGPSEnable){
            location = null;
            locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,1000,0,this);
            if (locationManager!=null){
                location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
                if (location!=null){
                    Log.e("latitude",location.getLatitude()+"");
                    Log.e("longitude",location.getLongitude()+"");
                    latitude = location.getLatitude();
                    longitude = location.getLongitude();
                    fn_update(location);
                }
            }
        }


    }

}

private class TimerTaskToGetLocation extends TimerTask{
    @Override
    public void run() {

        mHandler.post(new Runnable() {
            @Override
            public void run() {
                fn_getlocation();
            }
        });

    }
}

private void fn_update(Location location){

    intent.putExtra("latutide",location.getLatitude()+"");
    intent.putExtra("longitude",location.getLongitude()+"");
    sendBroadcast(intent);
}


}

Answer 4

我發現非常簡單和順利的解決方案：按照這個步驟來讓你的當前位置，這很容易別擔心，我做了測試 ， 可以正常使用

1. 在build.gradle中添加依賴項

實現“ com.google.android.gms：play-services-location：15.0.1”

1. 在清單文件中添加這2個權限

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

2. 將此片段添加到您的類MainActivity中：

   公共類MainActivity擴展Activity 實現LocationListener {

    LocationManager locationManager; String provider; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) { // Check Permissions Now ActivityCompat.requestPermissions(this, new String[] { Manifest.permission.ACCESS_FINE_LOCATION }, 0); } // Getting LocationManager object statusCheck(); locationManager = (LocationManager) getSystemService( Context.LOCATION_SERVICE); // Creating an empty criteria object Criteria criteria = new Criteria(); // Getting the name of the provider that meets the criteria provider = locationManager.getBestProvider(criteria, false); if (provider != null && !provider.equals("")) { if (!provider.contains("gps")) { // if gps is disabled final Intent poke = new Intent(); poke.setClassName("com.android.settings", "com.android.settings.widget.SettingsAppWidgetProvider"); poke.addCategory(Intent.CATEGORY_ALTERNATIVE); poke.setData(Uri.parse("3")); sendBroadcast(poke); } // Get the location from the given provider Location location = locationManager .getLastKnownLocation(LocationManager.NETWORK_PROVIDER); locationManager.requestLocationUpdates( LocationManager.NETWORK_PROVIDER, 500, 0, this); if (location != null) onLocationChanged(location); else location = locationManager.getLastKnownLocation(provider); if (location != null) onLocationChanged(location); else Toast.makeText(getBaseContext(), "Location can't be retrieved", Toast.LENGTH_SHORT).show(); } else { Toast.makeText(getBaseContext(), "No Provider Found", Toast.LENGTH_SHORT).show(); } } public void statusCheck() { final LocationManager manager = (LocationManager) getSystemService( Context.LOCATION_SERVICE); if (!manager.isProviderEnabled(LocationManager.GPS_PROVIDER)) { buildAlertMessageNoGps(); } } private void buildAlertMessageNoGps() { final AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setMessage( "Your GPS seems to be disabled, do you want to enable it?") .setCancelable(false).setPositiveButton("Yes", new DialogInterface.OnClickListener() { public void onClick(final DialogInterface dialog, final int id) { startActivity(new Intent( android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS)); } }) .setNegativeButton("No", new DialogInterface.OnClickListener() { public void onClick(final DialogInterface dialog, final int id) { dialog.cancel(); } }); final AlertDialog alert = builder.create(); alert.show(); } @Override public boolean onCreateOptionsMenu(Menu menu) { /* getMenuInflater().inflate(R.menu.activity_main, menu); */ return true; } @Override public void onLocationChanged(Location location) { // Getting reference to TextView tv_longitude TextView tvLongitude = (TextView) findViewById(R.id.tv_longitude); // Getting reference to TextView tv_latitude TextView tvLatitude = (TextView) findViewById(R.id.tv_latitude); // Setting Current Longitude tvLongitude.setText("Longitude:" + location.getLongitude()); // Setting Current Latitude tvLatitude.setText("Latitude:" + location.getLatitude()); } @Override public void onProviderDisabled(String provider) { // TODO Auto-generated method stub if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) { // Check Permissions Now ActivityCompat.requestPermissions(this, new String[] { Manifest.permission.ACCESS_FINE_LOCATION }, 0); } } @Override public void onProviderEnabled(String provider) { // TODO Auto-generated method stub } @Override public void onStatusChanged(String provider, int status, Bundle extras) { // TODO Auto-generated method stub } 

   }

3. 將此添加到您的activity_main.xml

    <TextView android:id="@+id/tv_location" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerHorizontal="true" android:text="current location" android:textStyle="bold" /> <TextView android:id="@+id/tv_longitude" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/tv_location" android:layout_centerHorizontal="true" /> <TextView android:id="@+id/tv_latitude" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/tv_longitude" android:layout_centerHorizontal="true" />