package com.yuvalhermelin.buildseasonmanager;

import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;

public class MainActivity extends AppCompatActivity
{

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

@@ -349,62 +349,309 @@
 em;%0A
-%0Apublic class MainActivity extends AppCompatActivity%0A%7B
+import android.widget.Button;%0Aimport android.widget.CheckBox;%0Aimport android.widget.EditText;%0Aimport android.widget.Spinner;%0A%0Apublic class MainActivity extends AppCompatActivity%0A%7B%0A    private Spinner mSpinner;%0A    private Button mButton;%0A    private CheckBox mCheckBox;%0A    private EditText mEditText;
 %0A%0A  

Add variables in MainActivity.java