我查看了文档，但我找不到任何理由为什么MapFragment只会在左下角显示带有Google徽标的灰色屏幕。在我的清单中，我在应用程序级别（GMS版本号和api密钥）上有适当的元数据。模块gradle文件具有所有必需的依赖项。错误可能在java代码中，如下所示：
import android.content.pm.PackageManager;
import android.location.Location;
import android.location.LocationListener;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.ActivityCompat;
import android.support.v4.app.FragmentActivity;
import android.support.v4.content.ContextCompat;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationServices;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
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.MarkerOptions;
import com.google.android.gms.maps.model.Polyline;
import com.google.android.gms.maps.model.PolylineOptions;
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback, GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener, LocationListener {
private GoogleMap mMap;
private Polyline polyline;
private PolylineOptions mPLO;
private GoogleApiClient mGoogleApiClient;
private boolean mLocationPermissionGranted;
private static final int PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION = 1;
private Location mLastKnownLocation;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
mGoogleApiClient = new GoogleApiClient.Builder(this)
.enableAutoManage(this /* FragmentActivity */,
this /* OnConnectionFailedListener */)
.addConnectionCallbacks(this)
.addApi(LocationServices.API)
.build();
mGoogleApiClient.connect();
}
/**
* Manipulates the map once available.
* This callback is triggered when the map is ready to be used.
* This is where we can add markers or lines, add listeners or move the camera. In this case,
* we just add a marker near Sydney, Australia.
* If Google Play services is not installed on the device, the user will be prompted to install
* it inside the SupportMapFragment. This method will only be triggered once the user has
* installed Google Play services and returned to the app.
*/
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
LatLng sydney = new LatLng(-33.852, 151.211);
mMap.addMarker(new MarkerOptions().position(sydney)
.title("Marker in Sydney"));
mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
//mPLO = new PolylineOptions().geodesic(true);;
//polyline = mMap.addPolyline(mPLO);
// Turn on the My Location layer and the related control on the map.
// updateLocationUI();
// Get the current location of the device and set the position of the map.
//getDeviceLocation();
}
@Override
public void onConnected(@Nullable Bundle bundle) {
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
}
@Override
public void onLocationChanged(Location location) {
// mPLO.add(new LatLng(location.getLatitude(), location.getLongitude()));
}
@Override
public void onProviderDisabled(String s) {
}
@Override
public void onProviderEnabled(String s) {
}
@Override
public void onStatusChanged(String s, int i, Bundle bundle) {
}
private void getDeviceLocation() {
if (ContextCompat.checkSelfPermission(this.getApplicationContext(),
android.Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
mLocationPermissionGranted = true;
} else {
ActivityCompat.requestPermissions(this,
new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION},
PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION);
}
// A step later in the tutorial adds the code to get the device location.
}
/**
* Handles the result of the request for location permissions.
*/
@Override
public void onRequestPermissionsResult(int requestCode,
@NonNull String permissions[],
@NonNull int[] grantResults) {
mLocationPermissionGranted = false;
switch (requestCode) {
case PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION: {
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
mLocationPermissionGranted = true;
}
}
}
updateLocationUI();
}
/**
* Updates the map's UI settings based on whether the user has granted location permission.
*/
private void updateLocationUI() {
if (mMap == null) {
return;
}
/*
* Request location permission, so that we can get the location of the
* device. The result of the permission request is handled by a callback,
* onRequestPermissionsResult.
*/
if (ContextCompat.checkSelfPermission(this.getApplicationContext(),
android.Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
mLocationPermissionGranted = true;
} else {
ActivityCompat.requestPermissions(this,
new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION},
PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION);
}
if (mLocationPermissionGranted) {
mMap.setMyLocationEnabled(true);
mMap.getUiSettings().setMyLocationButtonEnabled(true);
} else {
mMap.setMyLocationEnabled(false);
mMap.getUiSettings().setMyLocationButtonEnabled(false);
mLastKnownLocation = null;
}
}
}
logcat显示以下错误
234-31464/com.gjd.capstone E/Google Maps Android API: Authorization failure. Please see https://developers.google.com/maps/documentation/android-api/start for how to correctly set up the map.
03-12 15:30:12.967 30234-31464/com.gjd.capstone E/Google Maps Android API: In the Google Developer Console (https://console.developers.google.com)
Ensure that the "Google Maps Android API v2" is enabled.
Ensure that the following Android Key exists:
API Key: <Redacted>
Android Application (<cert_fingerprint>;<package_name>): 47:B9:AC:D7:30:4D:AB:2D:6E:29:06:99:24:B1:7C:07:95:0A:8B:96;com.gjd.capstone
我甚至已经查看了开发人员控制台，看看api是否被禁用，它不是。我还不确定该怎么做。我不确定＆＃34; Google Maps Android API v2＆＃34;已启用，我无法找到它的选项。
答案 0 :(得分：1)
我找到了解决问题的方法。在我创建MapsActivity之后，我更改了java文件的包，但是我没有在开发控制台中更改包名。
答案 1 :(得分：0)
通过在另一台PC上打开项目，不再显示MapFragmant。为了解决这个问题，我用我的电脑上的密钥库签署了我的应用程序。
在xamarin下 1.创建我的应用程序的存档（一个apk） 2.如果尚未完成，请创建密钥库 3.单击“分发” 4.选择Ad Hoc 5.选择密钥库 6.单击另存为并保存到应用程序 7.重建项目