LoginScreen

MainActiviy.java
======================
package com.example.teacher.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 txtUser,txtPass;
    Button btnRegister;
    Context context;
    private final String TEST_USER="zeev";
    private final String TEST_PASS="12345";

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

    private void setPointer() {
        context=this;
        txtUser=findViewById(R.id.txtUser);
        txtPass=findViewById(R.id.txtPass);
        btnRegister=findViewById(R.id.btnRegister);
        btnRegister.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(context, "Dude, please register", Toast.LENGTH_LONG).show();
            }
        });
    }

    public void btnLogin(View view)
    {
        //Toast.makeText(this, "Hello my brother from another mother", Toast.LENGTH_LONG).show();
        String myUser=txtUser.getText().toString();
        String myPass=txtPass.getText().toString();
        // TEST_USER==myUser - will not work, we need equals....
    }

    @Override
    public void onClick(View view) {
        switch (view.getId())
        {
            case R.id.btnAr:
                Toast.makeText(context, "Arabic", Toast.LENGTH_SHORT).show();
                break;

            case R.id.btnEn:
                Toast.makeText(context, "English", Toast.LENGTH_SHORT).show();
                break;

            case R.id.btnHe:
                Toast.makeText(context, "Hebrew", Toast.LENGTH_SHORT).show();
                break;

            case R.id.btnRu:
                Toast.makeText(context, "Russion", Toast.LENGTH_SHORT).show();
                break;

            default:
                Toast.makeText(context, "WTF?!?!?!?", Toast.LENGTH_SHORT).show();
                break;
        }
    }
}





activity_main.xml
======================
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="#ffffff">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:orientation="vertical">
        <ImageView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:src="@drawable/logo_mysh"/>
    </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:orientation="vertical"
        android:gravity="center"
        android:layout_marginLeft="@dimen/edge"
        android:layout_marginRight="@dimen/edge">
        <EditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="@string/user_name"
            android:id="@+id/txtUser"/>
        <EditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="@string/user_pass"
            android:id="@+id/txtPass"
            android:inputType="textPassword"/>
    </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:orientation="vertical">
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="horizontal"
            android:layout_weight="1"
            android:layout_marginRight="@dimen/edge"
            android:layout_marginLeft="@dimen/edge"
            android:gravity="center">
            <Button
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:background="#009fff"
                android:textColor="#ffffff"
                android:text="@string/btnLogin"
                android:textSize="22sp"
                android:layout_margin="@dimen/edge"
                android:onClick="btnLogin"/>
            <Button
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:background="#009fff"
                android:textColor="#ffffff"
                android:text="@string/btnRegister"
                android:textSize="22sp"
                android:layout_margin="@dimen/edge"
                android:id="@+id/btnRegister"/>
        </LinearLayout>
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="2dp"
            android:background="#000000"/>
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="horizontal"
            android:layout_weight="1">
            <Button
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:background="#009fff"
                android:textColor="#ffffff"
                android:text="@string/btnAr"
                android:textSize="16sp"
                android:layout_margin="@dimen/edge"
                android:id="@+id/btnAr"
                android:onClick="onClick"/>
            <Button
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:background="#009fff"
                android:textColor="#ffffff"
                android:text="@string/btnHE"
                android:textSize="16sp"
                android:layout_margin="@dimen/edge"
                android:id="@+id/btnHe"
                android:onClick="onClick"/>
            <Button
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:background="#009fff"
                android:textColor="#ffffff"
                android:text="@string/btnRu"
                android:textSize="16sp"
                android:layout_margin="@dimen/edge"
                android:id="@+id/btnRu"
                android:onClick="onClick"/>
            <Button
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:background="#009fff"
                android:textColor="#ffffff"
                android:text="@string/btnEn"
                android:textSize="16sp"
                android:layout_margin="@dimen/edge"
                android:id="@+id/btnEn"
                android:onClick="onClick"/>
        </LinearLayout>
    </LinearLayout>
</LinearLayout>



strings.xml
===================
<resources>
    <string name="app_name">MySmartHome</string>
    <string name="user_name">Enter user ID...</string>
    <string name="user_pass">Enter user password...</string>
    <string name="btnLogin">Login</string>
    <string name="btnRegister">Register</string>
    <string name="btnHE">עברית</string>
    <string name="btnRu">Rus</string>
    <string name="btnEn">Eng</string>
    <string name="btnAr">Arabic</string>
</resources>


dim.xml
=============
<?xml version="1.0" encoding="utf-8"?>
<resources>
    <dimen name="edge">16dp</dimen>
</resources>