ナビゲーションドロワーで現在地が地図に表示されない

Question

私はAndroid Developmentを初めて使用しています。 MainActivityとしてNavigation drawerを使用しました。MAPのマップアクティビティを使用しました。他の質問で見つけたGPSTracker Javaファイルを使用しました。

マップアクティビティでアプリを実行すると、現在のユーザーの現在地が表示されますが、ナビゲーショントレイではエラーなしで実行されますが現在の場所は表示されません。

MainActivity.java

public class MapsActivity extends FragmentActivity implements OnMapReadyCallback { 
Button btnShowLocation; 

// GPSTracker class 
GPSTracker gps; 
private GoogleMap mMap; 
double latitude; 
double longitude; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_maps); 
    SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager() 
      .findFragmentById(R.id.map); 
    mapFragment.getMapAsync(this); 


} 


@Override 
public void onMapReady(GoogleMap googleMap) { 
    mMap = googleMap; 
    gps = new GPSTracker(MapsActivity.this); 

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

     latitude = gps.getLatitude(); 
     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(); 
    } 
    // Add a marker in Sydney and move the camera 
    Toast.makeText(getApplicationContext(), "Your Location is - \nLat: " + latitude + "\nLong: " + longitude, Toast.LENGTH_LONG).show(); 

    LatLng sydney = new LatLng(latitude, longitude); 
    mMap.addMarker(new MarkerOptions().position(sydney).title("You are here").icon(BitmapDescriptorFactory 
      .fromResource(R.drawable.defaultico))); 

    //mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney)); 
    float zoomLevel = (float) 14.0; //This goes up to 21 
    mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(sydney, zoomLevel)); 
    mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL); 
} 
} 

MapsActivity.java

public class MapsActivity extends FragmentActivity implements OnMapReadyCallback { 
Button btnShowLocation; 

// GPSTracker class 
GPSTracker gps; 
private GoogleMap mMap; 
double latitude; 
double longitude; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_maps); 
    SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager() 
      .findFragmentById(R.id.map); 
    mapFragment.getMapAsync(this); 


} 


@Override 
public void onMapReady(GoogleMap googleMap) { 
    mMap = googleMap; 
    gps = new GPSTracker(MapsActivity.this); 

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

     latitude = gps.getLatitude(); 
     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(); 
    } 
    // Add a marker in Sydney and move the camera 
    Toast.makeText(getApplicationContext(), "Your Location is - \nLat: " + latitude + "\nLong: " + longitude, Toast.LENGTH_LONG).show(); 

    LatLng sydney = new LatLng(latitude, longitude); 
    mMap.addMarker(new MarkerOptions().position(sydney).title("You are here").icon(BitmapDescriptorFactory 
      .fromResource(R.drawable.defaultico))); 

    //mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney)); 
    float zoomLevel = (float) 14.0; //This goes up to 21 
    mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(sydney, zoomLevel)); 
    mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL); 


} 


} 

Activity_main.xml

：以下

は私のコードです

<?xml version="1.0" encoding="utf-8"?> 

<include layout="@layout/app_bar_main" android:layout_width="match_parent" 
    android:layout_height="match_parent" /> 

<android.support.design.widget.NavigationView android:id="@+id/nav_view" 
    android:layout_width="wrap_content" android:layout_height="match_parent" 
    android:layout_gravity="start" android:fitsSystemWindows="true" 
    app:headerLayout="@layout/nav_header_main" app:menu="@menu/activity_main_drawer" /> 

activity_maps.xml

​​

activity_navigation.xml

<android.support.v4.widget.DrawerLayout 
xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:app="http://schemas.android.com/apk/res-auto" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:fitsSystemWindows="true"> 
<include layout="@layout/activity_maps"/> 
<android.support.design.widget.NavigationView 
    android:layout_width="wrap_content" 
    android:layout_height="match_parent" 
    android:layout_gravity="start" 

    app:headerLayout="@layout/drawer_header" 
    app:menu="@menu/drawer"/> 


</android.support.v4.widget.DrawerLayout> 

Answer 1

のGoogle MAPでMyLocationを表示するには、このメソッドを使用します。 -

mMap.setMyLocationEnabled（真の）;

カスタムマーカーを使用しない場合は、

Answer 2

Try This : Just call this method and import what needs to be imported. 

public void setMyLocation(){ 
    LocationListener locationListener = new LocationListener() { 
       public void onLocationChanged(Location location) { 
        // Called when a new location is found by the network location provider. 
        Geocoder gCoder = new Geocoder(this); 
        ArrayList<Address> addresses = null; 
        try { 
         addresses = (ArrayList<Address>) gCoder.getFromLocation(location.getLatitude(),location.getLongitude(), 1); 
        } catch (IOException e) { 
         e.printStackTrace(); 
        } 
        if (addresses != null && addresses.size() > 0) { 
         Toast.makeText(this, "locaion : " + addresses.get(0).getAddressLine(0), Toast.LENGTH_LONG).show(); 


        } 
       } 

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

       public void onProviderEnabled(String provider) { 
       } 

       public void onProviderDisabled(String provider) { 
       } 
      }; 

    // Register the listener with the Location Manager to receive location updates 
      if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.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 null; 
      } 
      locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener); 
    }