Signin Code

package com.semesta.suryakami;

import android.app.AlertDialog;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.text.InputType;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.appcompat.widget.Toolbar;
import androidx.appcompat.app.AppCompatActivity;

import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.android.gms.tasks.Task;
import com.google.android.material.textfield.TextInputEditText;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.iid.FirebaseInstanceId;

import java.util.Objects;

public class SigninActivity extends AppCompatActivity {

    ImageButton backPress;
    private TextInputEditText mSigninEmail, mSigninPassword;

    private Dialog epicDialog;

    private ProgressDialog mLoginProgress;
    private FirebaseAuth mAuth;

    private DatabaseReference mUserDatabase;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_signin);

        backPress = findViewById(R.id.backLogin);
        mAuth = FirebaseAuth.getInstance();
        mLoginProgress = new ProgressDialog( this );
        mUserDatabase = FirebaseDatabase.getInstance().getReference().child( "Users" );

        epicDialog = new Dialog(this);
        TextView mRecoverPassword = findViewById(R.id.recoverPassword);

        mSigninEmail = findViewById( R.id.signinEmail);
        mSigninPassword = findViewById( R.id.signinPassword);
        Button mSignin_btn = findViewById(R.id.buttonSignin);

        mRecoverPassword.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                showRecoverPasswordDialog();
            }
        });

        mSignin_btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                if (validateEmailPassword()) {
                    return;
                }

                ShowReminderPopup();

            }
        });

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

    private void showRecoverPasswordDialog() {
        //AlertDialog
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("Memulihkan Password");

        //set layout linear layout
        LinearLayout linearLayout = new LinearLayout(this);
        //views to set in dialog
        final EditText emailText = new EditText(this);
        emailText.setHint("Email Anda");
        emailText.setInputType(InputType.TYPE_TEXT_VARIATION_EMAIL_ADDRESS);
        emailText.setMinEms(16);

        linearLayout.addView(emailText);
        linearLayout.setPadding(10,10,10,10);

        builder.setView(linearLayout);

        //buttons recover
        builder.setPositiveButton("Memulihkan", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                //input email
                String email = emailText.getText().toString().trim();
                beginRecovery(email);
            }
        });

        //buttons cancel
        builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                dialogInterface.dismiss();
            }
        });

        //show dialog
        builder.create().show();
    }

    private void beginRecovery(String email) {
        mLoginProgress.setMessage("Mengirim Email...");
        mLoginProgress.show();
        mAuth.sendPasswordResetEmail(email).addOnCompleteListener(new OnCompleteListener<Void>() {
            @Override
            public void onComplete(@NonNull Task<Void> task) {
                mLoginProgress.dismiss();
                if (task.isSuccessful()) {

                    Toast.makeText(SigninActivity.this, "Email Terkirim", Toast.LENGTH_SHORT).show();

                } else {

                    Toast.makeText(SigninActivity.this, "Gagal...", Toast.LENGTH_SHORT).show();

                }

            }
        }).addOnFailureListener(new OnFailureListener() {
            @Override
            public void onFailure(@NonNull Exception e) {
                mLoginProgress.dismiss();
                //get and show proper error message
                Toast.makeText(SigninActivity.this, ""+e.getMessage(), Toast.LENGTH_SHORT).show();
            }
        });
    }


    private boolean validateEmailPassword() {

        String emailInput = (Objects.requireNonNull(mSigninEmail.getText()).toString().trim());
        String passwordInput = (Objects.requireNonNull(mSigninPassword.getText()).toString().trim());

        if (emailInput.isEmpty() | passwordInput.isEmpty() ) {

            Toast.makeText(this, "Masukkan Email dan Password Anda", Toast.LENGTH_SHORT).show();
            return true;

        } else {

            mSigninEmail.setError(null);
            return false;
        }

    }

    private void ShowReminderPopup() {

        epicDialog.setContentView(R.layout.activity_popup_reminder);
        ImageView closePopup = epicDialog.findViewById(R.id.closePopupImg);
        Button acceptBtn = epicDialog.findViewById(R.id.btnAccept);

        closePopup.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                epicDialog.dismiss();
            }
        });

        acceptBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                String email = Objects.requireNonNull(mSigninEmail.getText()).toString();
                String password = Objects.requireNonNull(mSigninPassword.getText()).toString();

                if (!TextUtils.isEmpty( email ) || !TextUtils.isEmpty( password )){

                    mLoginProgress.setTitle( "Logging In" );
                    mLoginProgress.setMessage( "Please Wait While We Check Your Credentials." );
                    mLoginProgress.setCanceledOnTouchOutside( false );
                    mLoginProgress.show();

                    loginUser(email,password);

                    epicDialog.dismiss();
                }

            }
        });

        Objects.requireNonNull(epicDialog.getWindow()).setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
        epicDialog.show();

    }

    private void loginUser(String email, String password) {

        mAuth.signInWithEmailAndPassword( email, password ).addOnCompleteListener( new OnCompleteListener<AuthResult>() {
            @Override
            public void onComplete(@NonNull Task<AuthResult> task) {

                if (task.isSuccessful()){

                    if (Objects.requireNonNull(mAuth.getCurrentUser()).isEmailVerified()) {

                        mLoginProgress.dismiss();
                        String current_user_id = Objects.requireNonNull(mAuth.getCurrentUser()).getUid();
                        String deviceToken = FirebaseInstanceId.getInstance().getToken();

                        mUserDatabase.child(current_user_id).child("device_token").setValue(deviceToken).addOnSuccessListener(new OnSuccessListener<Void>() {
                            @Override
                            public void onSuccess(Void aVoid) {

                                Intent mainIntent = new Intent(SigninActivity.this, MainActivity.class);
                                mainIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
                                startActivity(mainIntent);
                                finish();
                            }
                        });

                    } else {

                        mLoginProgress.hide();
                        Toast.makeText(SigninActivity.this, "Silahkan Verifikasi Alamat Email Anda.", Toast.LENGTH_LONG).show();
                    }

                } else {

                    mLoginProgress.hide();
                    Toast.makeText(SigninActivity.this, "Tidak Bisa Masuk, Silahkan Cek Email dan Password Anda.", Toast.LENGTH_LONG).show();
                }

            }
        } );

    }

}