MyTask_01 - MainActivity.java

package com.example.admin.mytask;

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


public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    final String USERNAME_DB = "userAA", USERPASS_DB = "pasS123";
    EditText txtUser, txtPass;


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

    public void setPointer() {
        txtUser = findViewById(R.id.txtUser);
        txtPass = findViewById(R.id.txtPass);
    }


    @Override
    public void onClick(View view) {
        String userName = txtUser.getText().toString();
        String userPass = txtPass.getText().toString();

        switch (view.getId()) {
            case R.id.btnLogin:
                if (userName.equals(USERNAME_DB)) {
                    if (userPass.length() == 0) {
                        Toast.makeText(MainActivity.this, getString(R.string.loginErrorPassNull), Toast.LENGTH_SHORT).show();
                    } else if (userPass.equals(USERPASS_DB)) {
                        Toast.makeText(MainActivity.this, getString(R.string.loginSuccess), Toast.LENGTH_SHORT).show();
                    } else {
                        Toast.makeText(MainActivity.this, getString(R.string.loginErrorPassMismatch), Toast.LENGTH_SHORT).show();
                    }

                } else {
                    Toast.makeText(MainActivity.this, getString(R.string.loginErrorUserMismatch), Toast.LENGTH_SHORT).show();
                }

                break;

            case R.id.btnRegister:
                if (userName.length() == 0) {
                    Toast.makeText(MainActivity.this, getString(R.string.loginErrorUserNull), Toast.LENGTH_SHORT).show();
                    break;
                }
                if (userPass.length() == 0) {
                    Toast.makeText(MainActivity.this, getString(R.string.loginErrorPassNull), Toast.LENGTH_SHORT).show();
                    break;
                }


                //TODO create a new username <--> md5 password LinkedHashMap

                break;
        }
    }
}