/**
 * The {@link android.support.v4.view.PagerAdapter} that will provide
 * fragments for each of the sections. We use a
 * {@link FragmentPagerAdapter} derivative, which will keep every
 * loaded fragment in memory. If this becomes too memory intensive, it
 * may be best to switch to a
 * {@link android.support.v4.app.FragmentStatePagerAdapter}.
 */
private SectionsPagerAdapter mSectionsPagerAdapter;

/**
 * The {@link ViewPager} that will host the section contents.
 */
private ViewPager mViewPager;
public RelativeLayout fondo,fondo2,fondo3;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);


    // Create the adapter that will return a fragment for each of the three
    // primary sections of the activity.
    mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());

    // Set up the ViewPager with the sections adapter.
    mViewPager = (ViewPager) findViewById(R.id.container);
    mViewPager.setAdapter(mSectionsPagerAdapter);
    TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
    tabLayout.setupWithViewPager(mViewPager);
    fondo=(RelativeLayout)findViewById(R.id.fondo);
    fondo2=(RelativeLayout)findViewById(R.id.fondo2);
    fondo3=(RelativeLayout)findViewById(R.id.fondo3);

}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    Bundle datos=getIntent().getExtras();
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.cambiar_color){
        colorfondo();
        return  true;
    }else if (id == R.id.acerca_de_la_app){
            ejecutarinfo();
        return  true;
    }else if (id == R.id.acerca_del_autor){
        ejecutarautor();
        return  true;
    }

    return super.onOptionsItemSelected(item);
}
public void colorfondo(){

    fondo.setBackgroundColor(Color.BLACK);
    fondo2.setBackgroundColor(Color.BLACK);
    fondo3.setBackgroundColor(Color.BLACK);
}