HLessJon Tutorials

package com.mycompany.reaction;

import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.RelativeLayout;
import android.widget.Spinner;
import android.widget.TextView;

import java.util.ArrayList;


public class MainActivity extends AppCompatActivity {

    ArrayList<String> colorList = new ArrayList<String>();
    Button myButton;



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
//there are a lot of things your going to need to import ALT+ENTER import class.
//create spinner in memory
            final Spinner spinner = (Spinner) findViewById(R.id.spinner1);//name is important in xml



// this is your list that goes in the spinner
        colorList.add("Choose");
        colorList.add("Red");
        colorList.add("Blue");

        // Create the ArrayAdapter
        ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(MainActivity.this

                ,android.R.layout.simple_spinner_item,colorList);

        // Set the Adapter
        spinner.setAdapter(arrayAdapter);

        // Set the ClickListener for Spinner
        spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

            public void onItemSelected(AdapterView<?> adapterView,
                                       View view, int i, long l) {
                //make your choices
                //this String.valueOf(spinner.getSelectedItem())turns
                // whatever your spinner choice is into a string you can use
                // assigned it to a variable to make it faster to work with
                String choice = String.valueOf(spinner.getSelectedItem());

                if (choice == "Red") {//do stuff here,
                    RelativeLayout backChange = (RelativeLayout) findViewById(R.id.re_bck);
                    //need to name your RelativeLayout re_bck for this to work
                    backChange.setBackgroundColor(Color.RED);
                } else if (choice == "Blue") {//do stuff here,
                    RelativeLayout backChange = (RelativeLayout) findViewById(R.id.re_bck);
                    //need to name your RelativeLayout re_bck for this to work
                    backChange.setBackgroundColor(Color.BLUE);
                }// this is affect the default color because Blue or Red is not chosen.
                else {
                    choice = "White";
                    RelativeLayout backChange = (RelativeLayout) findViewById(R.id.re_bck);

                    backChange.setBackgroundColor(Color.WHITE);

                }
                ///
                myButton = (Button)findViewById(R.id.button1);
                final String finalChoice = choice;
                myButton.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        if(finalChoice == "Blue"){
                        TextView myText = (TextView)findViewById(R.id.textView1);
                        myText.setText("Blue");}

                        else if (finalChoice == "Red"){

                        TextView myText = (TextView)findViewById(R.id.textView1);
                        myText.setText("Red");}
                        else{

                        TextView myText = (TextView)findViewById(R.id.textView1);
                        myText.setText("White");}
                    }
                });


                ///
            }


            // If no option selected
            public void onNothingSelected(AdapterView<?> arg0) {
                // TODO Auto-generated method stub

            }

        });




    }


}