安卓位置权限代码无法正常工作

Question

我写了一个简单的代码，用于在运行时从用户那里获取位置权限。只是第一次它正常工作。之后，根本不显示权限对话框。任何人都可以告诉我代码中缺少什么......

public static final String FINE_LOCATION=Manifest.permission.ACCESS_FINE_LOCATION;
public static final String COARSE_LOCATION=Manifest.permission.ACCESS_COARSE_LOCATION;
private static final int LOCATION_PERMISSION_REQUEST_CODE=1234;
private boolean mLocationPermissionGranted=false;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
getLocationPermission();
}
public void initMap() {
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
}
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
Toast.makeText(this, "Map is ready", Toast.LENGTH_SHORT).show();
}
public void getLocationPermission(){
String [] permissions={Manifest.permission.ACCESS_FINE_LOCATION,Manifest.permission.ACCESS_COARSE_LOCATION};
if(ContextCompat.checkSelfPermission(this.getApplicationContext(),FINE_LOCATION)==PackageManager.PERMISSION_GRANTED){
if(ContextCompat.checkSelfPermission(this.getApplicationContext(),COARSE_LOCATION)==PackageManager.PERMISSION_GRANTED){
mLocationPermissionGranted=true;
initMap();
} else {
ActivityCompat.requestPermissions(this,permissions,LOCATION_PERMISSION_REQUEST_CODE);
}
}
else {
ActivityCompat.requestPermissions(this,permissions,LOCATION_PERMISSION_REQUEST_CODE);
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
mLocationPermissionGranted=false;
switch (requestCode){
case LOCATION_PERMISSION_REQUEST_CODE:{
if(grantResults.length>0){
for(int i=0;i<grantResults.length;i++){
if(grantResults[i]!=PackageManager.PERMISSION_GRANTED){
mLocationPermissionGranted=false;
return;
}
}
mLocationPermissionGranted=true;
initMap();
}
}
}
}

下面给出了 gradle 依赖项：

implementation fileTree(include: ['*.jar'], dir: 'libs')
implementation 'com.android.support:appcompat-v7:26.1.0'
implementation 'com.google.android.gms:play-services-maps:15.0.1'
implementation 'com.google.android.gms:play-services-vision:15.0.2'
implementation 'com.google.android.gms:play-services-location:15.0.1'
implementation 'com.google.android.gms:play-services-maps:15.0.1'

我是谷歌地图编码的新手，所以我对它知之甚少。任何身体都有解决方案请帮助我。提前致谢

Answer 1

只是第一次它正常工作。在该权限之后 根本不显示对话框

授予权限后，除非用户通过设置应用程序更改它或重新安装应用程序等，否则无需再次允许它

Answer 2

您可以使用以下代码：

public static double longitude = 0.0d;
public static double latitude = 0.0d;
private FusedLocationProviderClient mFusedLocationClient;
private long UPDATE_INTERVAL = 30 * 1000;  /* 10 secs */
private long FASTEST_INTERVAL = 2000; /* 2 sec */

---

在 oncreate 中添加以下代码：

protected void startLocationUpdates() {
LocationRequest mLocationRequest = new LocationRequest();
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
mLocationRequest.setInterval(UPDATE_INTERVAL);
mLocationRequest.setFastestInterval(FASTEST_INTERVAL);
// Create LocationSettingsRequest object using location request
LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder();
builder.addLocationRequest(mLocationRequest);
LocationSettingsRequest locationSettingsRequest = builder.build();
// Check whether location settings are satisfied
// https://developers.google.com/android/reference/com/google/android/gms/location/SettingsClient
SettingsClient settingsClient = LocationServices.getSettingsClient(this);
settingsClient.checkLocationSettings(locationSettingsRequest);
final LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
if( !locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)){
showGPSDisabledAlertToUser();
} 
return;
else {

// new Google API SDK v11 uses getFusedLocationProviderClient(this)
LocationServices.getFusedLocationProviderClient(this).requestLocationUpdates(mLocationRequest, new LocationCallback() {
@Override
public void onLocationResult(LocationResult locationResult) {
// do work here
onLocationChanged(locationResult.getLastLocation());
}
},
Looper.myLooper());
}
}