Android Studio:在谷歌地图中获取当前标记位置的 GPS 坐标

Android Studio : fetching GPS coordinates of the current marker location in Google Maps(Android Studio:在谷歌地图中获取当前标记位置的 GPS 坐标)

问题描述

我需要将以下内容包含到 Android 应用程序中，我希望有人可以提供一些编码示例来说明我在这里尝试实现的确切目标.

I have the following that needs to be included into an Android application, I'm hoping someone could provide some coding samples to illustrate what exactly I'm attempting to achieve here.

• Android 应用的屏幕上有一个谷歌地图界面.

• The Android App has a Google Maps interface on the screen.

应用用户可以浏览打开的谷歌地图界面并选择特定位置.

User of the App can browse through the opened Google Map interface and select a particular location.

我想获取这个位置的 GPS 坐标.

I want to fetch the GPS coordinates of this location.

提前致谢！！

推荐答案

这里，答案.它工作正常.我还从堆栈溢出中找到了这个解决方案，但存在一些问题.但现在所有问题都解决了，代码运行良好.

Here, Answer. It's working fine. I also found this solution from stack overflow with some problem. But now all resolved and code work well.

添加权限到清单AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="sichlearning.example.com.androidgpstrackingactivity">

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

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
                   <meta-data
            android:name="com.google.android.geo.API_KEY"
            android:value="@string/google_maps_key" />

        <activity
            android:name=".MapsActivity"
            android:label="@string/title_activity_maps"></activity>
    </application>

</manifest>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <Button android:id="@+id/btnShowLocation"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Show Location"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="50dp"
        />
</LinearLayout>

MainActivity.java

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {


    Button btnShowLocation;

    // GPSTracker class
    GPSTracker gps;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btnShowLocation = (Button) findViewById(R.id.btnShowLocation);

        // Show location button click event
        btnShowLocation.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View arg0) {
                // Create class object
                gps = new GPSTracker(MainActivity.this);

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

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

                    // 
 is for new line
                    Toast.makeText(getApplicationContext(), "Your Location is - 
Lat: " + latitude + "
Long: " + 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();
                }
            }
        });

    }

    }

GPSTracker.java

import android.Manifest;
        import android.app.AlertDialog;
        import android.app.Service;
        import android.content.Context;
        import android.content.DialogInterface;
        import android.content.Intent;
        import android.content.pm.PackageManager;
        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 android.support.v4.app.ActivityCompat;



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) {
                            if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                                // TODO: Consider calling
                                //    ActivityCompat#requestPermissions
                                // here to request the missing permissions, and then overriding
                                //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
                                //                                          int[] grantResults)
                                // to handle the case where the user grants the permission. See the documentation
                                // for ActivityCompat#requestPermissions for more details.
                                //return TODO;
                            }
                            location = locationManager
                                    .getLastKnownLocation(LocationManager.GPS_PROVIDER);
                            if (location != null) {
                                latitude = location.getLatitude();
                                longitude = location.getLongitude();
                            }
                        }
                    }
                }
            }

        } catch (Exception e) {
        }
        return location;
    }

    /**
     * Stop using GPS listener Calling this function will stop using GPS in your
     * app.
     * */
    public void stopUsingGPS() {
        if (locationManager != null) {
            if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                // TODO: Consider calling
                //    ActivityCompat#requestPermissions
                // here to request the missing permissions, and then overriding
                //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
                //                                          int[] grantResults)
                // to handle the case where the user grants the permission. See the documentation
                // for ActivityCompat#requestPermissions for more details.
                return;
            }
            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 DialogHelp Title
        alertDialog.setTitle("GPS is settings");

        // Setting DialogHelp 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) {
        try {
        float bestAccuracy = -1f;
        if (location.getAccuracy() != 0.0f && (location.getAccuracy() < bestAccuracy) || bestAccuracy == -1f) {
            if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                // TODO: Consider calling
                //    ActivityCompat#requestPermissions
                // here to request the missing permissions, and then overriding
                //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
                //                                          int[] grantResults)
                // to handle the case where the 01user grants the permission. See the documentation
                // for ActivityCompat#requestPermissions for more details.
               // return ;
            }
            locationManager.removeUpdates(this);
        }
        bestAccuracy = location.getAccuracy();
        } catch (NullPointerException e) {
            System.out.print("Caught the NullPointerException");
        }
    }

    @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;
    }

    public float getAccurecy()
    {
        return location.getAccuracy();
    }

}

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