Android - Zoom auf den Benutzer Standort und zeigt die Karte

Question

Ich bin ein Anfänger auf Android. Also bitte helfen! Mit einem Klick auf die Schaltfläche zoomt die Kamera nun auf den Benutzerstandort, aber ich möchte, dass sie zoomt, sobald die Aktivität erstellt wurde. Und ändern Sie den Standort, wenn sich der Benutzer bewegt.

package com.example.mapdemo; 

import android.Manifest; 
import android.content.pm.PackageManager; 
import android.content.res.Resources; 
import android.os.Bundle; 
import android.support.annotation.NonNull; 
import android.support.v4.app.ActivityCompat; 
import android.support.v4.content.ContextCompat; 
import android.support.v7.app.AppCompatActivity; 
import android.util.Log; 
import android.widget.Toast; 

import com.google.android.gms.maps.CameraUpdateFactory; 
import com.google.android.gms.maps.GoogleMap; 
import com.google.android.gms.maps.GoogleMap.OnMyLocationButtonClickListener; 
import com.google.android.gms.maps.OnMapReadyCallback; 
import com.google.android.gms.maps.SupportMapFragment; 
import com.google.android.gms.maps.model.LatLng; 
import com.google.android.gms.maps.model.MapStyleOptions; 
import com.google.android.gms.maps.model.MarkerOptions; 



public class MyLocationDemoActivity extends AppCompatActivity 
     implements 
     OnMyLocationButtonClickListener, 
     OnMapReadyCallback, 
     ActivityCompat.OnRequestPermissionsResultCallback { 
    double lat=0,lng=0; 
    /** 
    * Request code for location permission request. 
    * 
    * @see #onRequestPermissionsResult(int, String[], int[]) 
     */ 
    private static final int LOCATION_PERMISSION_REQUEST_CODE = 1; 

    /** 
* Flag indicating whether a requested permission has been denied after returning in 
* {@link #onRequestPermissionsResult(int, String[], int[])}. 
*/ 
private boolean mPermissionDenied = false; 

private GoogleMap mMap; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.my_location_demo); 

    SupportMapFragment mapFragment = 
      (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map); 
    mapFragment.getMapAsync(this); 
} 

@Override 
public void onMapReady(GoogleMap map) { 
    mMap = map; 

    try { 
     // Customise the styling of the base map using a JSON object defined 
     // in a raw resource file. 
     boolean success = mMap.setMapStyle(
       MapStyleOptions.loadRawResourceStyle(
         this, R.raw.mapstyle_night)); 

     if (!success) { 
      Log.e("MapsActivityRaw", "Style parsing failed."); 
     } 
    } catch (Resources.NotFoundException e) { 
     Log.e("MapsActivityRaw", "Can't find style.", e); 
    } 
    //mMap.setOnMyLocationButtonClickListener(this); 
    enableMyLocation(); 
    LatLng loc = new LatLng(lat, lng); 
    mMap.addMarker(new MarkerOptions().position(loc).title("New Marker")); 
    mMap.moveCamera(CameraUpdateFactory.newLatLng(loc)); 
} 

/** 
* Enables the My Location layer if the fine location permission has been granted. 
*/ 
private void enableMyLocation() { 
    if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) 
      != PackageManager.PERMISSION_GRANTED) { 
     // Permission to access the location is missing. 
     PermissionUtils.requestPermission(this, LOCATION_PERMISSION_REQUEST_CODE, 
       Manifest.permission.ACCESS_FINE_LOCATION, true); 
    } else if (mMap != null) { 
     // Access to the location has been granted to the app. 
     mMap.setMyLocationEnabled(true); 
    } 
} 

@Override 
public boolean onMyLocationButtonClick() { 
    Toast.makeText(this, "MyLocation button clicked", Toast.LENGTH_SHORT).show(); 
    // Return false so that we don't consume the event and the default behavior still occurs 
    // (the camera animates to the user's current position). 
    return false; 
} 


@Override 
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, 
     @NonNull int[] grantResults) { 
    if (requestCode != LOCATION_PERMISSION_REQUEST_CODE) { 
     return; 
    } 

    if (PermissionUtils.isPermissionGranted(permissions, grantResults, 
      Manifest.permission.ACCESS_FINE_LOCATION)) { 
     // Enable the my location layer if the permission has been granted. 
     enableMyLocation(); 
    } else { 
     // Display the missing permission error dialog when the fragments resume. 
     mPermissionDenied = true; 
    } 
} 

@Override 
protected void onResumeFragments() { 
    super.onResumeFragments(); 
    if (mPermissionDenied) { 
     // Permission was not granted, display error dialog. 
     showMissingPermissionError(); 
     mPermissionDenied = false; 
    } 
} 

/** 
* Displays a dialog with error message explaining that the location permission is missing. 
*/ 
private void showMissingPermissionError() { 
    PermissionUtils.PermissionDeniedDialog 
      .newInstance(true).show(getSupportFragmentManager(), "dialog"); 
} 

}

Answer 1

Sie Zoom xml einstellen können mit Attribut auch wie folgt aus:

<fragment xmlns:android="http://schemas.android.com/apk/res/android" 
     xmlns:map="http://schemas.android.com/apk/res-auto" 
     android:name="com.google.android.gms.maps.SupportMapFragment" 
     android:id="@+id/map" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     map:cameraZoom="13" 
     map:mapType="normal" 
     map:uiCompass="true" 
     map:uiRotateGestures="true" 
     map:uiScrollGestures="false" 
     map:uiTiltGestures="true" 
     map:uiZoomControls="false" 
     map:uiZoomGestures="true"/> 

Answer 2

Verwenden folgenden Link Ihren aktuellen Standort erhalten:

http://www.androidhive.info/2012/07/android-gps-location-manager-tutorial/

Nun, wenn Sie Ihre aktuelle geografische Breite und Länge Nutzung erhalten folgende Zeilen zu Ihrer aktuellen Position vergrößern:

mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(latitude,longitude),16)); 
mMap.getUiSettings().setZoomControlsEnabled(true); 

Verwenden Sie danach setOnMyL ocationChangeListener() Methode der Karte, um die Markierung zu ändern, wenn sich der Benutzer bewegt.