Taking pictures with camera android convert to base64

I'm new to this page.

I am trying to create an app where you can decide whether to take a picture or upload it from the phone gallery. I found this code in one of the questions here but I have a question since I have not used these functions.

  

Convert image to base64 android .

The code I leave here is the same, the case is that it is not for this line of code according to the answer is to handle it by category but I still do not understand how to correct this error if it is another class or a variable.

public class CreateBits extends AppCompatActivity {
EditText editText;
private static int RESULT_LOAD_IMG = 1;
String imgDecodableString;
Button nxtActivity;
SharedPreferencesController spc;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_create_bits);
    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

    editText = (EditText)findViewById(R.id.edtTextNameBit);
    spc = new SharedPreferencesController(this);
}
public void addBit(View view){
    String bitName = editText.getText().toString();
    App.addBits(bitName, imgDecodableString, spc.getCategoryPID());
    finish();
}
public void Cancell(View view){
    finish();
}
public void addImage(View view){
    Intent galleryIntent = new Intent(Intent.ACTION_PICK,
            android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
    // Start the Intent
    startActivityForResult(galleryIntent, RESULT_LOAD_IMG);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    try {
        // When an Image is picked
        if (requestCode == RESULT_LOAD_IMG && resultCode == RESULT_OK
                && null != data) {
            // Get the Image from data
            Uri selectedImage = data.getData();
            //Log.i("RegirstrarPerfil",data.toString());
            String[] filePathColumn = {MediaStore.Images.Media.DATA};
            // Get the cursor
            Cursor cursor = getContentResolver().query(selectedImage,
                    filePathColumn, null, null, null);
            // Move to first row
            cursor.moveToFirst();
            int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
            imgDecodableString = cursor.getString(columnIndex);
            cursor.close();
            Log.i("Main", imgDecodableString);
            ImageView imgView = (ImageView) findViewById(R.id.imgCreateBit);
            // Set the Image in ImageView after decoding the String
            imgView.setImageBitmap(BitmapFactory
                    .decodeFile(imgDecodableString));
        } else {
            Toast.makeText(this, "You haven't picked Image",
                    Toast.LENGTH_LONG).show();
        }
    } catch (Exception e) {
        Toast.makeText(this, "Something went wrong", Toast.LENGTH_LONG)
                .show();
    }
}

}

CategoryUtility marks it in red

boolean result = CategoryUtility.checkPermission(Register_co.this);

case CategoryUtility.MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE: