大致位置

<manifest ... >
  <!-- Required when requesting precise location access on Android 12 (API level 31) and higher. -->
  <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
  <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
</manifest>

when {
    ContextCompat.checkSelfPermission(
            CONTEXT,
            Manifest.permission.ACCESS_FINE_LOCATION
            ) == PackageManager.PERMISSION_GRANTED -> {
        // You can use the API that requires the permission.
        performAction(...)
    }
    shouldShowRequestPermissionRationale(...) -> {
        // In an educational UI, explain to the user why your app requires this
        // permission for a specific feature to behave as expected. In this UI,
        // include a "cancel" or "no thanks" button that allows the user to
        // continue using your app without granting the permission.
        showInContextUI(...)
    }
    else -> {
        // Ask for both the ACCESS_FINE_LOCATION and ACCESS_COARSE_LOCATION permissions.
        requestPermissions(CONTEXT,
                arrayOf(Manifest.permission.ACCESS_FINE_LOCATION,
                        Manifest.permission.ACCESS_COARSE_LOCATION),
                REQUEST_CODE)
    }
}

if (ContextCompat.checkSelfPermission(
        CONTEXT, Manifest.permission.ACCESS_FINE_LOCATION) ==
        PackageManager.PERMISSION_GRANTED) {
    // You can use the API that requires the permission.
    performAction(...);
} else if (shouldShowRequestPermissionRationale(...)) {
    // In an educational UI, explain to the user why your app requires this
    // permission for a specific feature to behave as expected. In this UI,
    // include a "cancel" or "no thanks" button that allows the user to
    // continue using your app without granting the permission.
    showInContextUI(...);
} else {
    // Ask for both the ACCESS_FINE_LOCATION and ACCESS_COARSE_LOCATION permissions.
    requestPermissions(CONTEXT,
            new String[] { Manifest.permission.ACCESS_FINE_LOCATION,
                           Manifest.permission.ACCESS_COARSE_LOCATION },
            REQUEST_CODE);
}

override fun onRequestPermissionsResult(requestCode: Int,
        permissions: Array<String>, grantResults: IntArray) {
    when (requestCode) {
        REQUEST_CODE -> {
            // If the request is cancelled, the result arrays are empty.
            if (grantResults.isNotEmpty()) {
                if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    // ACCESS_FINE_LOCATION is granted
                } else if (grantResults[1] ==
                               PackageManager.PERMISSION_GRANTED) {
                    // ACCESS_COARSE_LOCATION is granted
                }
            } else {
                // Explain to the user that the feature is unavailable because
                // the feature requires a permission that the user has denied.
                // At the same time, respect the user's decision. Don't link to
                // system settings in an effort to convince the user to change
                // their decision.
            }
            return
        }

        // Add other 'when' lines to check for other
        // permissions this app might request.
        else -> {
            // Ignore all other requests.
        }
    }
}

@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions,
        int[] grantResults) {
    switch (requestCode) {
        case PERMISSION_REQUEST_CODE:
            // If the request is cancelled, the result arrays are empty.
            if (grantResults.length > 0) {
                if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    // ACCESS_FINE_LOCATION is granted
                } else if (grantResults[1] ==
                               PackageManager.PERMISSION_GRANTED) {
                    // ACCESS_COARSE_LOCATION is granted
                }
            } else {
                // Explain to the user that the feature is unavailable because
                // the feature requires a permission that the user has denied.
                // At the same time, respect the user's decision. Don't link to
                // system settings in an effort to convince the user to change
                // their decision.
            }
            return;
        }
        // Other 'case' lines to check for other
        // permissions this app might request.
    }
}