Login

package asap20.com.tracker;

import android.content.Intent;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;

import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.rengwuxian.materialedittext.MaterialEditText;

import asap20.com.tracker.model.Admin;

public class Login extends AppCompatActivity {

    TextView btnTracker, btnYangDiTrack;
    Button btnLogin;
    MaterialEditText fieldUsername, fieldPassword;
    String mode="tracker";

    FirebaseAuth auth;
    DatabaseReference databaseReference;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        databaseReference = FirebaseDatabase.getInstance().getReference();
        auth = FirebaseAuth.getInstance();

        btnTracker = findViewById(R.id.loginBtnTracker);
        btnYangDiTrack = findViewById(R.id.loginBtnYangDiTrack);
        btnLogin = findViewById(R.id.loginBtnLogin);
        fieldUsername = findViewById(R.id.loginFieldUsername);
        fieldPassword = findViewById(R.id.loginFieldPassword);

        btnLogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                signIn();
            }
        });

        btnTracker.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mode = "tracker";
                switchButtonPrevilages();
            }
        });

        btnYangDiTrack.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mode = "yangditrack";
                switchButtonPrevilages();
            }
        });
    }

    private void switchButtonPrevilages(){
        if (mode.equalsIgnoreCase("tracker")){
            btnTracker.setBackgroundResource(R.drawable.borderwhite);
            btnTracker.setTextColor(getResources().getColor(R.color.colorPrimary));
            btnYangDiTrack.setBackgroundResource(0);
            btnYangDiTrack.setTextColor(getResources().getColor(R.color.white));
        } else {
            btnTracker.setBackgroundResource(0);
            btnTracker.setTextColor(getResources().getColor(R.color.white));
            btnYangDiTrack.setBackgroundResource(R.drawable.borderwhite);
            btnYangDiTrack.setTextColor(getResources().getColor(R.color.colorPrimary));
        }
    }

    private void signIn(){
        Log.d("signin", "signin");
        if (!validateForm()){
            return;
        }

        String email = fieldUsername.getText().toString();
        String pass = fieldPassword.getText().toString();

        auth.signInWithEmailAndPassword(email,pass)
                .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        Log.d("sukses", "sukses " + task.isSuccessful());
                        //hideprogressdialog

                        if (task.isSuccessful()){
                            onAuthSuccess(task.getResult().getUser());
                        } else {
                            Toast.makeText(Login.this, "GAGAL", Toast.LENGTH_SHORT).show();
                        }
                    }
                });
    }

    //auth berhasil
    private void onAuthSuccess(FirebaseUser use){
        String username = usernameFromEmail(use.getEmail());

        //membuat user admin baru
        writeNewAdmin(use.getUid(), username, use.getEmail());

        //goto main activity
        startActivity(new Intent(Login.this, MainActivity.class));
        finish();
    }

    private String usernameFromEmail(String email) {
        if (email.contains("@")) {
            return email.split("@")[0];
        } else {
            return email;
        }
    }

    // menulis ke Database
    private void writeNewAdmin(String userId, String name, String email) {
        Admin admin = new Admin(name, email);

        databaseReference.child("admins").child(userId).setValue(admin);
    }

    private boolean validateForm() {
        boolean result = true;
        if (TextUtils.isEmpty(fieldUsername.getText().toString())) {
            fieldUsername.setError("Required");
            result = false;
        } else {
            fieldUsername.setError(null);
        }

        if (TextUtils.isEmpty(fieldPassword.getText().toString())) {
            fieldPassword.setError("Required");
            result = false;
        } else {
            fieldPassword.setError(null);
        }

        return result;
    }

}
Login