Fading the whole layout as scrolled up in collapsing bar layout android

Question

Below is the code of my coordinator layout. It works well.

Answer 1

You can reduce the alpha of the RelativeLayout as you scroll up by hooking up an AppBarLayout.OnOffsetChangedListener to the AppBarLayout. Below is the code I used in my app.

appBar = (AppBarLayout) findViewById(R.id.app_bar_layout);
appBar.addOnOffsetChangedListener(new AppBarLayout.OnOffsetChangedListener() {
        @Override
        public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) {

            relativeLayoutToFadeOut.setAlpha(1.0f - Math.abs(verticalOffset / (float)
                    appBarLayout.getTotalScrollRange()));


        }
    });

Answer 2

Please refer below code, for me its working fine..

 <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:id="@+id/view_profile_parent_layout"
        android:background="@color/splash_bg_color"
        tools:context=".Activity">

        <android.support.design.widget.AppBarLayout
            android:id="@+id/app_barLayout"
            android:layout_width="match_parent"
            android:layout_height="@dimen/view_profile_profile_app_bar_height"
            android:elevation="@dimen/view_profile_app_bar_elevation"
            android:theme="@style/ThemeOverlay.AppCompat.Light">

            <android.support.design.widget.CollapsingToolbarLayout
                android:id="@+id/collapsing_bar_layout"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                app:contentScrim="?attr/colorPrimary"
                app:titleEnabled="false"
                android:fitsSystemWindows="true"
                app:layout_scrollFlags="exitUntilCollapsed|scroll"
                app:title="Collapsing Toolbar">

                <RelativeLayout
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:layout_marginTop="?attr/actionBarSize">

                <de.hdodenhof.circleimageview.CircleImageView
                    xmlns:app="http://schemas.android.com/apk/res-auto"
                    android:id="@+id/view_profile_imageView"
                    android:layout_width="@dimen/view_profile_profile_width"
                    android:layout_height="@dimen/view_profile_profile_height"
                    android:src="@drawable/ic_profile_icon"
                    android:layout_centerHorizontal="true"
                    app:civ_border_width="@dimen/view_profile_profile_border_width"
                    app:civ_border_color="@color/textPrimary"/>

                <TextView
                    android:id="@+id/view_profile_profile_name_textView"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginTop="@dimen/view_profile_profile_name_margin_top"
                    android:layout_below="@id/view_profile_imageView"
                    android:fontFamily="@font/roboto_regular"
                    android:text=""
                    android:textSize="@dimen/view_profile_profile_name_text_size"
                    android:gravity="center"
                    android:textColor="@color/white"/>

                </RelativeLayout>

                <android.support.v7.widget.Toolbar
                    android:id="@+id/toolbar"
                    app:layout_collapseMode="pin"
                    android:layout_width="match_parent"
                    android:layout_height="?attr/actionBarSize"
                    android:elevation="@dimen/login_btn_elevation"
                    app:popupTheme="@style/AppTheme.PopupOverlay"
                    app:contentInsetLeft="0dp"
                    app:contentInsetStart="0dp"
                    android:contentInsetStart="0dp"
                    android:contentInsetLeft="0dp">

                </android.support.v7.widget.Toolbar>

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

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