问题：Maps API在API 23下工作正常但由于运行时问题，他们在第一次运行时无法以某种方式获得权限。他们第一次要求权限，但第一次不工作。当我第二次运行应用程序时，它也适用于23以上的API。但是对于第一次运行，它不起作用。这段代码应该做什么，并且第二次要求用户逐个放置两个标记，并使用用户选择的坐标对其进行反向地理编码。
import android.Manifest;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.location.Address;
import android.location.Geocoder;
import android.location.Location;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.app.ActivityCompat;
import android.support.v4.app.FragmentActivity;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AlertDialog;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
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.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
import java.io.IOException;
import java.util.List;
import java.util.Locale;
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback,
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener,
LocationListener {
private GoogleMap mMap;
GoogleApiClient mGoogleApiClient;
Location mLastLocation;
Marker mCurrLocationMarker;
LocationRequest mLocationRequest;
public Button homeLocationFromPin;
public Button officeLocationFromPin;
public static double homeLatitude;
public static double officeLatitude;
public static double homeLongitude;
public static double officeLongitude;
public int count = 0;
public MarkerOptions placedHomeMarker;
public MarkerOptions placedOfficeMarker;
public static final int LOCATION_REQUEST_CODE = 99;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
if (ActivityCompat.checkSelfPermission
(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
&& ActivityCompat.checkSelfPermission
(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
requestPermission(Manifest.permission.ACCESS_FINE_LOCATION,
LOCATION_REQUEST_CODE);
}
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(map);
mapFragment.getMapAsync(this);
homeLocationFromPin = (Button) findViewById(R.id.confirmHomeLocation);
homeLocationFromPin.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (String.valueOf(homeLongitude) != null && String.valueOf(homeLatitude) != null) {
//Get nearby Places here based on Latitude and Longitude
// Toast.makeText(MapsActivity.this, getAddress(homeLatitude, homeLongitude), Toast.LENGTH_LONG).show();
showAlertBoxForHomeLocationConfirmation(getAddress(homeLatitude, homeLongitude));
} else {
Toast.makeText(MapsActivity.this, "Please drop pin to home location first", Toast.LENGTH_SHORT).show();
}
}
});
officeLocationFromPin = (Button) findViewById(R.id.confirmOfficeLocation);
officeLocationFromPin.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (String.valueOf(officeLatitude) != null && String.valueOf(officeLongitude) != null) {
//Get nearby Places here based on Latitude and Longitude
// Toast.makeText(MapsActivity.this, getAddress(homeLatitude, homeLongitude), Toast.LENGTH_LONG).show();
showAlertBoxForOfficeLocationConfirmation(getAddress(officeLatitude, officeLongitude));
} else {
Toast.makeText(MapsActivity.this, "Please drop pin to home location first", Toast.LENGTH_SHORT).show();
}
}
});
}//End Of OnCreate
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
mMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
LatLng boston = new LatLng(42.3601, -71.0589);
mMap.moveCamera(CameraUpdateFactory.newLatLng(boston));
mMap.animateCamera(CameraUpdateFactory.zoomTo(15));
showAlertBox("Home");
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
buildGoogleApiClient();
mMap.setMyLocationEnabled(true);
Toast.makeText(this, "Inside Perm", Toast.LENGTH_LONG).show();
mMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() {
@Override
public void onMapClick(LatLng latLng) {
if (count == 0) {
//Make the confirm button available on first tap
homeLocationFromPin.setVisibility(View.VISIBLE);
//add(point);
mMap.clear();
placedHomeMarker = new MarkerOptions().position(latLng);
placedHomeMarker.title("Home Location");
mMap.addMarker(placedHomeMarker);
homeLatitude = latLng.latitude;
homeLongitude = latLng.longitude;
Toast.makeText(MapsActivity.this, getNameOnly(homeLatitude, homeLongitude), Toast.LENGTH_SHORT).show();
} else {
officeLocationFromPin.setVisibility(View.VISIBLE);
placedOfficeMarker = new MarkerOptions().position(latLng);
placedOfficeMarker.title("Office Location");
mMap.addMarker(placedOfficeMarker);
officeLatitude = latLng.latitude;
officeLongitude = latLng.longitude;
Toast.makeText(MapsActivity.this, getNameOnly(homeLatitude, homeLongitude), Toast.LENGTH_SHORT).show();
Toast.makeText(MapsActivity.this, getNameOnly(officeLatitude, officeLongitude), Toast.LENGTH_SHORT).show();
}
}
});
} else {
buildGoogleApiClient();
mMap.setMyLocationEnabled(true);
mMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() {
@Override
public void onMapClick(LatLng latLng) {
if (count == 0) {
//Make the confirm button available on first tap
homeLocationFromPin.setVisibility(View.VISIBLE);
//add(point);
mMap.clear();
placedHomeMarker = new MarkerOptions().position(latLng);
placedHomeMarker.title("Home Location");
mMap.addMarker(placedHomeMarker);
homeLatitude = latLng.latitude;
homeLongitude = latLng.longitude;
Toast.makeText(MapsActivity.this, getNameOnly(homeLatitude, homeLongitude), Toast.LENGTH_SHORT).show();
} else {
officeLocationFromPin.setVisibility(View.VISIBLE);
placedOfficeMarker = new MarkerOptions().position(latLng);
placedOfficeMarker.title("Office Location");
mMap.addMarker(placedOfficeMarker);
officeLatitude = latLng.latitude;
officeLongitude = latLng.longitude;
Toast.makeText(MapsActivity.this, getNameOnly(homeLatitude, homeLongitude), Toast.LENGTH_SHORT).show();
Toast.makeText(MapsActivity.this, getNameOnly(officeLatitude, officeLongitude), Toast.LENGTH_SHORT).show();
}
}
});
}
}
}//End of onMap Ready
protected synchronized void buildGoogleApiClient() {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
mGoogleApiClient.connect();
}
@Override
public void onConnected(Bundle bundle) {
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(1000);
mLocationRequest.setFastestInterval(1000);
mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
}
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onLocationChanged(Location location) {
mLastLocation = location;
if (mCurrLocationMarker != null) {
mCurrLocationMarker.remove();
}
//Place current location marker
LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
MarkerOptions markerOptions = new MarkerOptions();
markerOptions.position(latLng);
// markerOptions.title("Your Current Location");
// markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA));
// markerOptions.icon(BitmapDescriptorFactory.fromResource(R.drawable.home));
// markerOptions.draggable(true);
mCurrLocationMarker = mMap.addMarker(markerOptions);
//move map camera
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
mMap.animateCamera(CameraUpdateFactory.zoomTo(15));
//Set a marker drag listener
mMap.setOnMarkerDragListener(new GoogleMap.OnMarkerDragListener() {
@Override
public void onMarkerDragStart(Marker marker) {
}
@Override
public void onMarkerDrag(Marker marker) {
}
@Override
public void onMarkerDragEnd(Marker marker) {
mMap.animateCamera(CameraUpdateFactory.newLatLng(marker.getPosition()));
//Get the latitude and longitude of the place where user dropped the marker
Toast.makeText(MapsActivity.this, "Latitude:" + String.valueOf(marker.getPosition().latitude), Toast.LENGTH_LONG).show();
homeLatitude = marker.getPosition().latitude;
Toast.makeText(MapsActivity.this, "Longitude:" + String.valueOf(marker.getPosition().longitude), Toast.LENGTH_LONG).show();
homeLongitude = marker.getPosition().longitude;
}
});
//stop location updates
if (mGoogleApiClient != null) {
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
}
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
}
public void showAlertBox(String LocationName) {
AlertDialog.Builder b1 = new AlertDialog.Builder(MapsActivity.this);
b1.setMessage("Please select your " + LocationName + " location.\nTap anywhere on the screen to select your "
+ LocationName +
"location and press button to confirm.");
b1.setCancelable(false);
b1.setPositiveButton("Ok",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
}
});
AlertDialog customAlertBox = b1.create();
customAlertBox.show();
}
public void showAlertBoxForHomeLocationConfirmation(String reverseGeoStr) {
AlertDialog.Builder b1 = new AlertDialog.Builder(MapsActivity.this);
b1.setMessage("Confirm your home location or search again\n" + reverseGeoStr);
b1.setCancelable(false);
b1.setPositiveButton("Confirm",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
count = 3;
homeLocationFromPin.setVisibility(View.GONE);
showAlertBox("Office");
}
});
b1.setNegativeButton("Do it again",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
Toast.makeText(MapsActivity.this, "Place Pin Again", Toast.LENGTH_SHORT).show();
}
});
AlertDialog customAlertBox = b1.create();
customAlertBox.show();
}
public void showAlertBoxForOfficeLocationConfirmation(String reverseGeoStr) {
AlertDialog.Builder b1 = new AlertDialog.Builder(MapsActivity.this);
b1.setMessage("Confirm your Office location or search again\n" + reverseGeoStr);
b1.setCancelable(false);
b1.setPositiveButton("Confirm",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
Intent st = new Intent(MapsActivity.this, getUserName.class);
startActivity(st);
finish();
}
});
b1.setNegativeButton("Do it again",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
Toast.makeText(MapsActivity.this, "Place Pin Again", Toast.LENGTH_SHORT).show();
}
});
AlertDialog customAlertBox = b1.create();
customAlertBox.show();
}
private String getAddress(double latitude, double longitude) {
if (latitude == 0.0 || longitude == 0.0) {
//Give default values so it does not returns null
latitude = 42.3601;
longitude = -71.0589;
}
StringBuilder result = new StringBuilder();
try {
Geocoder geocoder = new Geocoder(this, Locale.getDefault());
List<Address> addresses = geocoder.getFromLocation(latitude, longitude, 1);
if (addresses.size() > 0) {
Address address = addresses.get(0);
result.append(address.getAddressLine(0)).append("\n");
result.append(address.getLocality()).append("\n");
result.append(address.getAdminArea()).append("\n");
result.append(address.getPostalCode()).append("\n");
result.append(address.getCountryName());
}
} catch (IOException e) {
Log.e("tag", e.getMessage());
}
return result.toString();
}
private String getNameOnly(double latitude, double longitude) {
if (latitude == 0.0 || longitude == 0.0) {
//Give default values so it does not returns null
latitude = 42.3601;
longitude = -71.0589;
}
StringBuilder result = new StringBuilder();
try {
Geocoder geocoder = new Geocoder(this, Locale.getDefault());
List<Address> addresses = geocoder.getFromLocation(latitude, longitude, 1);
if (addresses.size() > 0) {
Address address = addresses.get(0);
result.append(address.getAddressLine(0)).append("\n");
result.append(address.getLocality()).append("\n");
}
} catch (IOException e) {
Log.e("tag", e.getMessage());
}
return result.toString();
}
protected void requestPermission(String permissionType, int requestCode) {
int permission = ContextCompat.checkSelfPermission(this,
permissionType);
if (permission != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this,
new String[]{permissionType}, requestCode
);
}
}
@Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResults) {
switch (requestCode) {
case LOCATION_REQUEST_CODE: {
if (grantResults.length == 0
|| grantResults[0] != PackageManager.PERMISSION_GRANTED) {
Toast.makeText(this, "Unable to show location - permission required", Toast.LENGTH_LONG).show();
}
return;
}
}
}
}
答案 0 :(得分：3)
当您要求<?xml version="1.0" encoding="utf-8"?>
<RelativeLayoutxmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.jackd.testflash_26_4_2017.MainActivity">
<Button
android:text="Button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/btnFlash"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="124dp" />
</RelativeLayout>
中的位置更新时，您应该使用onMapReady()方法致电mapFragment.getMapAsync(this);：
onRequestPermissionsResult希望这有帮助。
答案 1 :(得分：1)
上面的解决方案使其适用于具有API＆gt;的手机23但它停止使用API＆lt; 23.所以我一直在努力。
@Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResults) {
switch (requestCode) {
case LOCATION_REQUEST_CODE: {
if (grantResults.length == 0 || grantResults[0] != PackageManager.PERMISSION_GRANTED) {
Toast.makeText(this, "Unable to show location - permission required", Toast.LENGTH_LONG).show();
return;
}
// if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED){
// mapFragment.getMapAsync(this);
// }
else
{
Toast.makeText(this,"Permission not granted",Toast.LENGTH_LONG).show();
}
break;
}
}
}
}
和onMapReady（）
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
mMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
LatLng boston = new LatLng(42.3601, -71.0589);
mMap.moveCamera(CameraUpdateFactory.newLatLng(boston));
mMap.animateCamera(CameraUpdateFactory.zoomTo(15));
showAlertBox("Home");
if (ActivityCompat.checkSelfPermission
(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED
&& ActivityCompat.checkSelfPermission
(this, Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
mMap.setMyLocationEnabled(true);
} else {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
requestPermission(Manifest.permission.ACCESS_FINE_LOCATION, LOCATION_REQUEST_CODE);
}
}
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
buildGoogleApiClient();
Toast.makeText(this, "Inside Perm", Toast.LENGTH_LONG).show();
mMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() {
@Override
public void onMapClick(LatLng latLng) {
if (count == 0) {
//Make the confirm button available on first tap
homeLocationFromPin.setVisibility(View.VISIBLE);
//add(point);
mMap.clear();
placedHomeMarker = new MarkerOptions().position(latLng);
placedHomeMarker.title("Home Location");
mMap.addMarker(placedHomeMarker);
homeLatitude = latLng.latitude;
homeLongitude = latLng.longitude;
Toast.makeText(MapsActivity.this, getNameOnly(homeLatitude, homeLongitude), Toast.LENGTH_SHORT).show();
} else {
officeLocationFromPin.setVisibility(View.VISIBLE);
placedOfficeMarker = new MarkerOptions().position(latLng);
placedOfficeMarker.title("Office Location");
mMap.addMarker(placedOfficeMarker);
officeLatitude = latLng.latitude;
officeLongitude = latLng.longitude;
Toast.makeText(MapsActivity.this, getNameOnly(homeLatitude, homeLongitude), Toast.LENGTH_SHORT).show();
Toast.makeText(MapsActivity.this, getNameOnly(officeLatitude, officeLongitude), Toast.LENGTH_SHORT).show();
}
}
});
} else {
buildGoogleApiClient();
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.
mMap.setMyLocationEnabled(true);
}
mMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() {
@Override
public void onMapClick(LatLng latLng) {
if (count == 0) {
//Make the confirm button available on first tap
homeLocationFromPin.setVisibility(View.VISIBLE);
//add(point);
mMap.clear();
placedHomeMarker = new MarkerOptions().position(latLng);
placedHomeMarker.title("Home Location");
mMap.addMarker(placedHomeMarker);
homeLatitude = latLng.latitude;
homeLongitude = latLng.longitude;
Toast.makeText(MapsActivity.this, getNameOnly(homeLatitude, homeLongitude), Toast.LENGTH_SHORT).show();
} else {
officeLocationFromPin.setVisibility(View.VISIBLE);
placedOfficeMarker = new MarkerOptions().position(latLng);
placedOfficeMarker.title("Office Location");
mMap.addMarker(placedOfficeMarker);
officeLatitude = latLng.latitude;
officeLongitude = latLng.longitude;
Toast.makeText(MapsActivity.this, getNameOnly(homeLatitude, homeLongitude), Toast.LENGTH_SHORT).show();
Toast.makeText(MapsActivity.this, getNameOnly(officeLatitude, officeLongitude), Toast.LENGTH_SHORT).show();
}
}
});
}
}//End of onMap Ready