Action Bar is transparent but buttons do not work

I use a Toolbar in which I wanted to be transparent, until I did however the button burger n is clickable, can anyone help?

It looks something like this:

Myxml:

<?xmlversion="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="false"
tools:context=".MainActivity">
<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize">
    </android.support.v7.widget.Toolbar>

</RelativeLayout>

<include layout="@layout/content_main" />

</android.support.design.widget.CoordinatorLayout>

My code:

    public class MainActivity extends AppCompatActivity
    implements NavigationView.OnNavigationItemSelectedListener {
ActionBarDrawerToggle toggle;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = findViewById(R.id.toolbar);
    toolbar.setTitleTextColor(Color.parseColor("#ffffff"));
    toolbar.setBackgroundColor(Color.TRANSPARENT);

    setSupportActionBar(toolbar);
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    getSupportActionBar().setHomeButtonEnabled(true);

    Window window = this.getWindow();

    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP){
        window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
        window.addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
        window.setStatusBarColor(Color.TRANSPARENT);
    }

    DrawerLayout drawer = findViewById(R.id.drawer_layout);
    toggle = new ActionBarDrawerToggle(
            this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
    drawer.addDrawerListener(toggle);
    toggle.syncState();

    android.support.v4.app.FragmentManager fm = getSupportFragmentManager();
    android.support.v4.app.FragmentTransaction fragmentTransaction = fm.beginTransaction();
    fragmentTransaction.replace(R.id.frame_Layout, new Fragment_Inicio());
    fragmentTransaction.disallowAddToBackStack();
    fragmentTransaction.commit();

    NavigationView navigationView = findViewById(R.id.nav_view_inthebox);
    navigationView.setNavigationItemSelectedListener(this);

    Helper h = new Helper();
    ImageButton callflex = findViewById(R.id.nav_logo);
    h.Abrir_link_externo_botao(callflex,"https://www.callflex.com.br", this);
    ImageButton linkedin = findViewById(R.id.nav_linkedin);
    h.Abrir_link_externo_botao(linkedin,"https://www.linkedin.com/company-beta/949222/", this);
    ImageButton instagram = findViewById(R.id.nav_instagram);
    h.Abrir_link_externo_botao(instagram,"https://www.instagram.com/callflexbr/", this);
    ImageButton facebook = findViewById(R.id.nav_facebook);
    h.Abrir_link_externo_botao(facebook,"https://www.facebook.com/callflex/", this);
    ImageButton youtube = findViewById(R.id.nav_youtube);
    h.Abrir_link_externo_botao(youtube,"https://www.youtube.com/channel/UCyMBD5Pcu6nHUlDij_N-iRw", this);
}
public void setActionBarTitle(String title) {
    getSupportActionBar().setTitle(title);
}
@Override
public void onBackPressed() {
    DrawerLayout drawer = findViewById(R.id.drawer_layout);
    if (drawer.isDrawerOpen(GravityCompat.START)) {
        drawer.closeDrawer(GravityCompat.START);
    }else {
        super.onBackPressed();
    }
}

@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.
    int id = item.getItemId();
    if (toggle.onOptionsItemSelected(item)) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}