frigidBlade7

Code is clean if it can be understood easily – by everyone on the team. Clean code can be read and enhanced by a developer other than its original author. With understandability comes readability, changeability, extensibility and maintainability.

---

General rules

1. Follow standard conventions.
2. Keep it simple stupid. Simpler is always better. Reduce complexity as much as possible.
3. Boy scout rule. Leave the campground cleaner than you found it.
4. Always find root cause. Always look for the root cause of a problem.

Design rules

frigidBlade7

Hexadecimal color code for transparency

How to set transparency with hex value ?

For example, you want to set 40% alpha transparence to #000000 (black color), you need to add 66 like this #66000000.

Download This sample on Google Play Store

frigidBlade7

// No Security

{
  "rules": {
    ".read": true,
    ".write": true
  }
}

frigidBlade7

public class BaseViewModel extends AndroidViewModel {

    private MutableLiveData<Event<NavigationCommand>> navigationCommandMutableLiveData = new MutableLiveData<>();
    private MutableLiveData<Event<SnackbarCommand>> snackbarCommandMutableLiveData = new MutableLiveData<>();

    public BaseViewModel(@NonNull Application application) {
        super(application);
    }

frigidBlade7

import androidx.annotation.NonNull;
import androidx.navigation.NavDirections;

public abstract class NavigationCommand {


    public static class NavigationAction extends NavigationCommand {

        @NonNull
        private final NavDirections directions;

frigidBlade7

public abstract class SnackbarCommand {

    public static class SnackbarString extends SnackbarCommand{

        private String snackbarString;

        public SnackbarString(String snackbarString) {
            this.snackbarString = snackbarString;
        }