Что такое торговая точка ссылки?

Первый код запроса на инициализацию

public  static final int PERMISSIONS_MULTIPLE_REQUEST = 123;

Проверить версию Android

 private void checkAndroidVersion() {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        checkPermission();

    } else {
        // write your logic here
    }

}

проверить код множественного доступа

 private void checkPermission() {
    if (ContextCompat.checkSelfPermission(getActivity(),
            Manifest.permission.READ_EXTERNAL_STORAGE) + ContextCompat
            .checkSelfPermission(getActivity(),
                    Manifest.permission.CAMERA)
            != PackageManager.PERMISSION_GRANTED) {

        if (ActivityCompat.shouldShowRequestPermissionRationale
                (getActivity(), Manifest.permission.READ_EXTERNAL_STORAGE) ||
                ActivityCompat.shouldShowRequestPermissionRationale
                        (getActivity(), Manifest.permission.CAMERA)) {

      Snackbar.make(getActivity().findViewById(android.R.id.content),
                    "Please Grant Permissions to upload profile photo",
                    Snackbar.LENGTH_INDEFINITE).setAction("ENABLE",
                    new View.OnClickListener() {
                        @Override
                        public void onClick(View v) {
                            requestPermissions(
                                    new String[]{Manifest.permission
                                            .READ_EXTERNAL_STORAGE, Manifest.permission.CAMERA},
                                    PERMISSIONS_MULTIPLE_REQUEST);
                        }
                    }).show();
        } else {
            requestPermissions(
                    new String[]{Manifest.permission
                            .READ_EXTERNAL_STORAGE, Manifest.permission.CAMERA},
                    PERMISSIONS_MULTIPLE_REQUEST);
        }
    } else {
        // write your logic code if permission already granted
    }
}

метод обратного вызова после предоставления разрешение пользователя

@Override
public void onRequestPermissionsResult(int requestCode,
                                       @NonNull String[] permissions, @NonNull int[] grantResults) {

    switch (requestCode) {
        case PERMISSIONS_MULTIPLE_REQUEST:
            if (grantResults.length > 0) {
               boolean cameraPermission = grantResults[1] == PackageManager.PERMISSION_GRANTED;
               boolean readExternalFile = grantResults[0] == PackageManager.PERMISSION_GRANTED;

                if(cameraPermission && readExternalFile)
                {
                    // write your logic here 
                } else {
                    Snackbar.make(getActivity().findViewById(android.R.id.content),
                        "Please Grant Permissions to upload profile photo",
                        Snackbar.LENGTH_INDEFINITE).setAction("ENABLE",
                        new View.OnClickListener() {
                            @Override
                            public void onClick(View v) {
                                requestPermissions(
                                        new String[]{Manifest.permission
                                                .READ_EXTERNAL_STORAGE, Manifest.permission.CAMERA},
                                        PERMISSIONS_MULTIPLE_REQUEST);
                            }
                        }).show();
                }
           }
           break;
    }
}