androidx 에서 권한 요청하기

1. 필요한 권한을 요청한다.

ContestCompat.checkSelfPermissions 를 이용해서 권한이 있는지 확인하고, 권한이 없는 경우에는 리스트에 추가한다.

필요한 권한을 리스트에 추가한 뒤 ActivityCompat.requestPermissions 를 이용해서 권한을 요청한다.

private static final int PERMISSION_REQUEST_CODE = 1;

private void checkPermissions(){
        List<String> permissionList = new ArrayList<>();

        if (ContextCompat.checkSelfPermission(
                this, Manifest.permission.ACCESS_COARSE_LOCATION) !=
                PackageManager.PERMISSION_GRANTED) {
            permissionList.add(Manifest.permission.ACCESS_COARSE_LOCATION);
        }
        if (ContextCompat.checkSelfPermission(
                this, Manifest.permission.BLUETOOTH) !=
                PackageManager.PERMISSION_GRANTED) {
            permissionList.add(Manifest.permission.BLUETOOTH);
        }
        if (ContextCompat.checkSelfPermission(
                this, Manifest.permission.BLUETOOTH_ADMIN) !=
                PackageManager.PERMISSION_GRANTED) {
            permissionList.add(Manifest.permission.BLUETOOTH_ADMIN);
        }

        if(permissionList.size() == 0){
            return;
        }

        String[] requestPermissions = permissionList.toArray(new String[permissionList.size()]);

        // You can directly ask for the permission.
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            ActivityCompat.requestPermissions(this, requestPermissions, PERMISSION_REQUEST_CODE);
        }
    }

 

2. 권한 획득 결과를 받을 콜백 구현

    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions,
                                            int[] grantResults) {
        switch (requestCode) {
            case PERMISSION_REQUEST_CODE:
                // If request is cancelled, the result arrays are empty.
                if (grantResults.length > 0 &&
                        grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    // Permission is granted. Continue the action or workflow
                    // in your app.
                }  else {
                    // Explain to the user that the feature is unavailable because
                    // the features 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.
    }