Expand and collapse Relativelayout by button click

I have this RelativeLayout which expand and collapse on button click it works fine on one button. I want to reuse same method on more two RelativeLayout in same layout and expand using other two buttons.

This code is running fine. just want more layout to do same action.

Layout:

This is my code:

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:scrollbars="none">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <RelativeLayout

            android:layout_width="fill_parent"
            android:layout_height="64dp"
            android:background="#FFF"
            android:orientation="vertical">

            <TextView

                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="Title"
                android:textSize="20sp" />

            <Button
                android:id="@+id/viewmore"
                android:layout_width="80dp"
                android:layout_height="match_parent"
                android:layout_marginLeft="280dp"
                android:background="@null"
                android:text="viewmore" />


        </RelativeLayout>


        <RelativeLayout

            android:visibility="gone"
            android:id="@+id/expandable"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:animateLayoutChanges="true"
            android:background="@color/colorAccent"
            android:orientation="vertical">


            <TextView

                android:layout_width="match_parent"
                android:layout_height="133dp"
                android:text="Text messaging, or texting, is the act of composing and sending electronic messages, typically consisting of alphabetic and numeric characters"
                android:textSize="20sp" />


        </RelativeLayout>


        <RelativeLayout


            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <TextView
                android:id="@+id/textView4"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="Title 2"
                android:textSize="20sp" />

            <Button
                android:id="@+id/viewmore1"
                android:layout_width="80dp"
                android:layout_height="match_parent"
                android:layout_marginLeft="280dp"
                android:background="@null"
                android:text="viewmore" />


        </RelativeLayout>

        <RelativeLayout
            android:visibility="gone"
            android:animateLayoutChanges="true"
            android:id="@+id/expandable1"
            android:layout_width="match_parent"
            android:layout_height="100dp"
            android:layout_marginTop="30dp"
            android:background="@color/colorPrimary">

            <TextView

                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="Text messaging, or texting, is the act of composing and sending electronic messages, typically consisting of alphabetic and numeric characters"
                android:textSize="20sp" />


        </RelativeLayout>

        <RelativeLayout

            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <TextView

                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="Title 3"
                android:textSize="20sp" />

            <Button
                android:id="@+id/viewmore2"
                android:layout_width="80dp"
                android:layout_height="match_parent"
                android:layout_marginLeft="280dp"
                android:background="@null"
                android:text="viewmore" />


        </RelativeLayout>

        <RelativeLayout
            android:visibility="gone"
            android:animateLayoutChanges="true"
            android:id="@+id/expandable2"
            android:layout_width="match_parent"
            android:layout_height="100dp"
            android:layout_marginTop="30dp"
            android:background="@color/colorPrimary">

            <TextView

                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="Text messaging, or texting, is the act of composing and sending electronic messages, typically consisting of alphabetic and numeric characters"
                android:textSize="20sp" />


        </RelativeLayout>


    </LinearLayout>
</ScrollView>

Source Code:

RelativeLayout relativeLayout, relativeLayout1, relativeLayout2;
    Button viewmore, viewmore1, viewmore2;
    ValueAnimator mAnimator;

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


        relativeLayout = (RelativeLayout) findViewById(R.id.expandable);
        relativeLayout1 = (RelativeLayout) findViewById(R.id.expandable1);
        relativeLayout2 = (RelativeLayout) findViewById(R.id.expandable2);


        viewmore = (Button) findViewById(R.id.viewmore);
        viewmore1 = (Button) findViewById(R.id.viewmore1);
        viewmore2 = (Button) findViewById(R.id.viewmore2);

        viewmore.setOnClickListener(this);
        viewmore1.setOnClickListener(this);
        viewmore2.setOnClickListener(this);


        relativeLayout.getViewTreeObserver().addOnPreDrawListener(
                new ViewTreeObserver.OnPreDrawListener() {

                    @Override
                    public boolean onPreDraw() {
                        relativeLayout.getViewTreeObserver().removeOnPreDrawListener(this);
                        relativeLayout.setVisibility(View.GONE);

                        final int widthSpec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
                        final int heightSpec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
                        relativeLayout.measure(widthSpec, heightSpec);

                        mAnimator = slideAnimator(0, relativeLayout.getMeasuredHeight());
                        return true;
                    }
                });


    }


    private void expand() {

        relativeLayout.setVisibility(View.VISIBLE);
        mAnimator.start();
    }

    private void collapse() {
        int finalHeight = relativeLayout.getHeight();

        ValueAnimator mAnimator = slideAnimator(finalHeight, 0);

        mAnimator.addListener(new Animator.AnimatorListener() {
            @Override
            public void onAnimationEnd(Animator animator) {
                //Height=0, but it set visibility to GONE
                relativeLayout.setVisibility(View.GONE);
            }

            @Override
            public void onAnimationStart(Animator animator) {
            }

            @Override
            public void onAnimationCancel(Animator animator) {
            }

            @Override
            public void onAnimationRepeat(Animator animator) {
            }
        });
        mAnimator.start();
    }


    private ValueAnimator slideAnimator(int start, int end) {

        ValueAnimator animator = ValueAnimator.ofInt(start, end);


        animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator valueAnimator) {
                //Update Height
                int value = (Integer) valueAnimator.getAnimatedValue();

                ViewGroup.LayoutParams layoutParams = relativeLayout.getLayoutParams();
                layoutParams.height = value;
                relativeLayout.setLayoutParams(layoutParams);
            }
        });
        return animator;
    }


    @Override
    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.viewmore:

                if (relativeLayout.getVisibility() == View.GONE) {
                    expand();
                } else {
                    collapse();
                }

                break;


            case R.id.viewmore1:


                break;

            case R.id.viewmore2:


                break;


        }
    }