Android Handling Click Events of Options Menu

/res/menu/option_menu.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:id="@+id/itemRed"
        android:title="@string/red" />
    <item android:id="@+id/itemBlue"
        android:title="@string/blue" />
    <item android:id="@+id/itemGreen"
        android:title="@string/green" />
    <item android:id="@+id/itemPurple"
        android:title="@string/purple" />
</menu>

MainActivity.java

public class MainActivity extends AppCompatActivity {

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


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {

        getMenuInflater().inflate(R.menu.option_menu,menu);

        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        RelativeLayout relativeLayout= (RelativeLayout) findViewById(R.id.activity_main);

        switch (item.getItemId())
        {
            case R.id.itemBlue:

                relativeLayout.setBackgroundColor(getResources().getColor(android.R.color.holo_blue_light));
                break;
            case R.id.itemGreen:
                relativeLayout.setBackgroundColor(getResources().getColor(android.R.color.holo_green_light));
                break;
            case R.id.itemPurple:
                relativeLayout.setBackgroundColor(getResources().getColor(android.R.color.holo_purple));
                break;
            case R.id.itemRed:
                relativeLayout.setBackgroundColor(getResources().getColor(android.R.color.holo_red_light));
                break;
        }

        return super.onOptionsItemSelected(item);
    }
}

References
https://github.com/mhdr/AndroidSamples/tree/master/021

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