My collapsing toolbar is not collapsing - android-coordinatorlayout

Question

I can drag the toolbar manually and toolbar and navigation drawer are not working
together, collapsingtoolbar is collapsing a little but its is not merging into appbar. And why are there so many requirements for posting a question here , just adding these lines to meet the error of mostly code in your body
XML containing collapsing toolbar
<!-- TODO: Update blank fragment layout -->
<android.support.v4.widget.DrawerLayout 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:id="#+id/drawer_layout2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<android.support.design.widget.NavigationView
android:id="#+id/nav_view1"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
app:headerLayout="#layout/nav_header"
app:menu="#menu/drawer_view" />
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="40dp"
android:layout_marginTop="320dp"
android:text="What is PMKVY?"
android:textAppearance="#style/TextAppearance.AppCompat.Display1"
android:textSize="30sp"
android:textStyle="bold"
tools:layout_editor_absoluteX="0dp"
tools:layout_editor_absoluteY="217dp" />
<TextView
android:id="#+id/textView1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="400dp"
android:fontFamily="serif"
android:text="#string/pmkvy_string"
android:textAppearance="#style/TextAppearance.AppCompat.Body1"
android:textColor="?android:attr/statusBarColor"
android:textSize="18sp"
android:textStyle="bold"
tools:layout_editor_absoluteX="-1dp"
tools:layout_editor_absoluteY="273dp" />
<Button
android:id="#+id/button6"
style="#style/Widget.AppCompat.Button.Colored"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="140dp"
android:layout_marginTop="720dp"
android:background="#android:color/black"
android:drawableRight="#drawable/ic_play_circle"
android:text="Watch Video"
android:textAlignment="center"
android:textColor="#android:color/background_light"
android:textStyle="bold"
tools:layout_editor_absoluteX="141dp"
tools:layout_editor_absoluteY="519dp" />
<TextView
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_marginTop="840dp"
android:text="How to Enroll?"
android:textAppearance="#style/TextAppearance.AppCompat.Display1"
android:textSize="30sp"
android:textStyle="bold" />
<TextView
android:id="#+id/textView3"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="910dp"
android:fontFamily="serif"
android:text="#string/enroll_string"
android:textAppearance="#style/TextAppearance.AppCompat.Body1"
android:textColor="?android:attr/statusBarColor"
android:textSize="18sp"
android:textStyle="bold"
tools:layout_editor_absoluteX="-1dp"
tools:layout_editor_absoluteY="565dp" />
<Button
android:id="#+id/button7"
style="#style/Widget.AppCompat.Button.Colored"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/textView3"
android:layout_centerHorizontal="true"
android:layout_marginTop="150dp"
android:background="#android:color/black"
android:text="Call 1800 102 6000"
android:textAlignment="center"
android:textColor="#android:color/background_light"
android:textStyle="bold" />
<TextView
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_marginTop="1230dp"
android:gravity="center"
android:text="OR"
android:textAppearance="#style/TextAppearance.AppCompat.Display1"
android:textSize="30sp"
android:textStyle="bold" />
<Button
android:id="#+id/button8"
style="#style/Widget.AppCompat.Button.Colored"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="160dp"
android:layout_marginTop="1170dp"
android:background="#android:color/black"
android:text="Enroll"
android:textAlignment="center"
android:textColor="#android:color/background_light"
android:textStyle="bold" />
</RelativeLayout>
</ScrollView>
<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="true">
<android.support.design.widget.AppBarLayout
android:id="#+id/appBar"
android:layout_width="match_parent"
android:layout_height="300dp"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
android:fitsSystemWindows="true">
<android.support.design.widget.CollapsingToolbarLayout
android:id="#+id/collapsingToolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_scrollFlags="scroll|enterAlways"
android:minHeight="20dp"
android:fitsSystemWindows="true"
app:contentScrim="?attr/colorPrimary"
app:expandedTitleMarginStart="25dp"
app:expandedTitleMarginEnd="30dp"
app:title="PMKVY">
<ImageView
android:id="#+id/toolbarImage"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="centerCrop"
android:fitsSystemWindows="true"
android:src="#drawable/pmkvy_logo"
app:layout_collapseMode="parallax" />
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginBottom="250dp"
android:background="#color/colorPrimaryDark"
android:theme="#style/ThemeOverlay.AppCompat.ActionBar" />
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
</android.support.design.widget.CoordinatorLayout>
</android.support.v4.widget.DrawerLayout>
.java file of xml
package com.example.shrey.myapplication;
import android.os.Build;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.NavigationView;
import android.support.design.widget.Snackbar;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.text.Html;
import android.view.MenuItem;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
public class ScrollingActivity1 extends AppCompatActivity {
private DrawerLayout drawerlayout1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.layout_activity_scrolling1);
drawerlayout1 = findViewById(R.id.drawer_layout2);
// set status bar color code
if (Build.VERSION.SDK_INT >= 21) {
Window window = this.getWindow();
window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
window.setStatusBarColor(this.getResources().getColor(R.color.material_blue_grey_950));
}
Toolbar toolbar = findViewById(R.id.toolbar1);
setSupportActionBar(toolbar);
ActionBar actionbar = getSupportActionBar();
actionbar.setDisplayHomeAsUpEnabled(true);
actionbar.setHomeAsUpIndicator(R.drawable.ic_navdrawer);
// <!-- code to change title and its color. -->
actionbar.setTitle(Html.fromHtml("<font color='#ffffff'>PMKVY</font>"));
NavigationView navigationView = findViewById(R.id.nav_view1);
navigationView.setNavigationItemSelectedListener(
new NavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem menuItem) {
// set item as selected to persist highlight
menuItem.setChecked(true);
// close drawer when item is tapped
drawerlayout1.closeDrawers();
// Add code here to update the UI based on the item selected
// For example, swap UI fragments here
return true;
}
});
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
drawerlayout1.openDrawer(GravityCompat.START);
return true;
}
return super.onOptionsItemSelected(item);
}
}