Content Toggler like Gmail

activity_main.xml

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        <!-- Container for the heading and content -->
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical">
            <!-- Heading container. Can contain multiple views inside it. -->
            <LinearLayout
                android:id="@+id/headingContainer"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="horizontal"
                android:background="#ffffc828">
                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Heading"/>
                <ImageView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:src="@drawable/aeroplane"/>
                </LinearLayout>
            <!-- Container for the togglable. Contains multiple views inside it. Default Visibility: gone -->
            <LinearLayout
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:orientation="vertical"
                android:background="#ffff9809"
                android:visibility="gone">
                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Content"/>
                <ImageView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:src="@drawable/holiday"/>
                </LinearLayout>
            </LinearLayout>
        </LinearLayout>
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MainActivity.java

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public class MainActivity extends Activity {
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    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
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        // Setting toggler on the right drawer's contents
        View headingView = findViewById(R.id.headingContainer);
        headingView.setOnClickListener(new contentToggler());
    }
}

class contentToggler implements View.OnClickListener {
    @Override
    public void onClick(View v) {
        ViewGroup parent = (ViewGroup) v.getParent();
        View childView = parent.getChildAt(parent.indexOfChild(v) + 1);
        this.viewToggler(childView);
    }

    private void viewToggler(View view) {
        if(view.getVisibility() == View.VISIBLE) {
            view.setVisibility(View.GONE);
        } else {
            view.setVisibility(View.VISIBLE);
        }
    }
}