MainActivity.java

package com.example.goodiny.mysmarthome;

import android.content.Context;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    EditText txtLogin, txtPassword;
    Button btnRegister;
    Context context;
    private final String USER_TEST = "user";
    private final String PASS_TEST = "password";

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

    private void setPointer() {
        context = this;
        txtLogin = findViewById(R.id.txt_login);
        txtPassword = findViewById(R.id.txt_password);
        btnRegister = findViewById(R.id.btn_register);
        btnRegister.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(context, "Register now", Toast.LENGTH_LONG).show();
            }
        });
    }

    public void btnLogin(View view) {
        String myUser = txtLogin.getText().toString();
        String myPass = txtPassword.getText().toString();
        if (myUser.equals(USER_TEST) && myPass.equals(PASS_TEST)) {
            Toast.makeText(context, "Logined", Toast.LENGTH_LONG).show();
        }else{
            Toast.makeText(context, "Wrong login or password try again!", Toast.LENGTH_LONG).show();
        }

    }

    @Override
    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.btnArb:
                Toast.makeText(context, "Arabic", Toast.LENGTH_LONG).show();
                break;
            case R.id.btnRus:
                Toast.makeText(context, "Russian", Toast.LENGTH_LONG).show();
                break;
            case R.id.btnHebr:
                Toast.makeText(context, "Hebrew", Toast.LENGTH_LONG).show();
                break;
            case R.id.btnEng:
                Toast.makeText(context, "English", Toast.LENGTH_LONG).show();
                break;
            default:
                Toast.makeText(context, "English by default or choose the language", Toast.LENGTH_LONG).show();
                break;
        }
    }
}