【发布时间】：2020-07-15 10:31:28
【问题描述】：
我正在编写一个应用程序，我必须在其中显示一个 Google 地图 标准片段并在其上绘制移动设备的更新位置（此应用程序中的 GCS） .该应用似乎只有在远程设备上通过 Android Studio 启动时才能正常工作。如果我尝试直接从设备本身启动它，地图永远不会准备好：它会显示但细节非常少。
package myapp.activities;
import android.Manifest;
import android.annotation.SuppressLint;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.pm.PackageManager;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import androidx.annotation.NonNull;
import androidx.core.app.ActivityCompat;
import androidx.fragment.app.FragmentActivity;
import com.google.android.gms.maps.CameraUpdate;
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.BitmapDescriptor;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.CameraPosition;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.android.material.snackbar.Snackbar;
import java.util.ArrayList;
import java.util.List;
import myapp.R;
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback, ActivityCompat.OnRequestPermissionsResultCallback, LocationListener {
private static final int PERMISSION_REQUEST_LOCATION = 11;
private static final int LOCATION_UPDATE_DELAY = 1000;
private final String gps_provider = LocationManager.GPS_PROVIDER;
private GoogleMap map;
private Location location;
private LocationManager location_manager;
private View layout;
private BitmapDescriptor base_icon;
private MarkerOptions base_marker_options;
private Marker base_marker;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
if (mapFragment != null)
mapFragment.getMapAsync(this);
//USER CODE
layout = findViewById(R.id.map);
assert layout != null;
location = new Location(getString(R.string.location_provider));
location.isFromMockProvider();
base_icon = BitmapDescriptorFactory.fromResource(R.drawable.base);
base_marker_options = new MarkerOptions().title(getString(R.string.destination_base_label)).icon(base_icon);
initLocalization();
//
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
if (requestCode == PERMISSION_REQUEST_LOCATION) {
if (grantResults.length == 1 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
Snackbar.make(layout, R.string.fine_location_access_granted, Snackbar.LENGTH_SHORT).show();
startLocalization();
} else {
Snackbar.make(layout, R.string.denied_fine_location_access_rationale, Snackbar.LENGTH_SHORT).show();
}
}
}
@Override
public void onMapReady(GoogleMap googleMap) {
map = googleMap;
map.getUiSettings().setZoomControlsEnabled(true);
map.getUiSettings().setCompassEnabled(true);
}
@Override
protected void onStart() {
super.onStart();
}
@Override
protected void onStop() {
super.onStop();
}
@Override
protected void onDestroy() {
super.onDestroy();
stopTelemetry();
}
@Override
public void onLocationChanged(Location location) {
this.location.set(location);
if (map != null) {
updateGCS(location);
}
}
@Override
public void onStatusChanged(String s, int i, Bundle bundle) {
}
@Override
public void onProviderEnabled(String s) {
}
@Override
public void onProviderDisabled(String s) {
}
private void updateGCS(final Location location) {
if(map==null)
return;
final LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
if (base_marker == null) {
base_marker_options.position(latLng);
base_marker = map.addMarker(base_marker_options);
} else
base_marker.setPosition(latLng);
final float _zoom = map.getCameraPosition().zoom;
final CameraPosition _cp = new CameraPosition.Builder().target(latLng).zoom(_zoom).build();
final CameraUpdate _cu = CameraUpdateFactory.newCameraPosition(_cp);
map.animateCamera(_cu);
}
private void requestLocationPermission() {
if (ActivityCompat.shouldShowRequestPermissionRationale(this,
Manifest.permission.ACCESS_FINE_LOCATION)) {
Snackbar.make(layout, R.string.denied_fine_location_access_rationale,
Snackbar.LENGTH_INDEFINITE).setAction(R.string.ok, new View.OnClickListener() {
@Override
public void onClick(View view) {
ActivityCompat.requestPermissions(MapsActivity.this,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
PERMISSION_REQUEST_LOCATION);
}
}).show();
} else {
Snackbar.make(layout, R.string.denied_fine_location_access_warning, Snackbar.LENGTH_SHORT).show();
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, PERMISSION_REQUEST_LOCATION);
}
}
private void initLocalization() {
if (ActivityCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
Snackbar.make(layout,
R.string.fine_location_access_granted,
Snackbar.LENGTH_SHORT).show();
startLocalization();
} else {
requestLocationPermission();
}
}
@SuppressLint("MissingPermission")
private void startLocalization() {
try {
location_manager = (LocationManager) getSystemService(LOCATION_SERVICE);
if (!location_manager.isProviderEnabled(gps_provider)) {
Intent gpsOptionsIntent = new Intent(
android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(gpsOptionsIntent);
} else {
location_manager.requestLocationUpdates(gps_provider, LOCATION_UPDATE_DELAY, 2, this);
}
} catch (Throwable e) {
Log.e(getClass().getName(), "Exception: " + e.getMessage());
}
}
}
【问题讨论】：
-
可能与release/debug api key有关？
标签： java android google-maps