Android使用Material Design自带CoordinatorLayout+AppBarLayout+CollapsingToolbarLayout+Toolbar组件实现标题栏滑动渐变色

效果图如下：

1.首先要在app.gradle文件中添加

implementation 'com.android.support:design:26.1.0'

2.布局文件如下：

<?xml version="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"    android:layout_width="match_parent"    android:layout_height="match_parent"    >    <android.support.design.widget.AppBarLayout        android:id="@+id/appBar"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">        <android.support.design.widget.CollapsingToolbarLayout            android:layout_width="match_parent"            android:layout_height="150dp"            app:layout_scrollFlags="scroll|exitUntilCollapsed">            <com.youth.banner.Banner                android:id="@+id/banner"                android:layout_width="match_parent"                android:layout_height="150dp" />            <android.support.v7.widget.Toolbar                android:layout_width="match_parent"                android:layout_height="50dp"                app:contentInsetStart="0dp"                app:layout_collapseMode="pin">                <LinearLayout                    android:id="@+id/ll_top"                    android:layout_width="match_parent"                    android:layout_height="50dp"                    android:gravity="center_vertical"                    android:orientation="horizontal"                    >                    <LinearLayout                        android:id="@+id/ll_search"                        android:layout_width="0dp"                        android:layout_height="wrap_content"                        android:layout_weight="3"                        android:layout_marginLeft="@dimen/text_layout_10_dp"                        android:background="@drawable/sousuo_yuanjiao"                        android:gravity="center_vertical"                        android:paddingBottom="3dp"                        android:paddingLeft="@dimen/text_layout_15_dp"                        android:paddingRight="@dimen/text_layout_10_dp"                        android:layout_centerVertical="true"                        android:paddingTop="3dp">                        <TextView                            android:layout_width="wrap_content"                            android:layout_height="24dp"                            android:layout_alignBottom="@+id/imageView1"                            android:layout_toEndOf="@+id/imageView1"                            android:layout_toRightOf="@+id/imageView1"                            android:layout_weight="2"                            android:drawableLeft="@drawable/ic_search_black"                            android:drawablePadding="@dimen/text_layout_10_dp"                            android:gravity="center_vertical"                            android:text="请输入食品、药品、食谱名称"                            android:textColor="@color/tv333"                            android:textSize="@dimen/text_size_13_sp" />                    </LinearLayout>                    <RelativeLayout                        android:layout_width="0dp"                        android:layout_height="match_parent"                        android:layout_weight="1"                        >                        <ImageView                            android:id="@+id/iv_message"                            android:layout_width="wrap_content"                            android:layout_height="match_parent"                            android:scaleType="centerInside"                            android:layout_centerVertical="true"                            android:layout_alignParentRight="true"                            android:paddingRight="@dimen/text_layout_10_dp"                            android:src="@drawable/ic_message" />                    </RelativeLayout>                </LinearLayout>            </android.support.v7.widget.Toolbar>        </android.support.design.widget.CollapsingToolbarLayout>    </android.support.design.widget.AppBarLayout>    <android.support.v4.widget.NestedScrollView        android:id="@+id/scrollView"        android:layout_width="match_parent"        android:layout_height="match_parent"        app:layout_behavior="@string/appbar_scrolling_view_behavior"        android:scrollbars="none">        <!-自己的内容-->    </android.support.v4.widget.NestedScrollView></android.support.design.widget.CoordinatorLayout>

3.具体实现代码：

appBarLayout.addOnOffsetChangedListener(new AppBarLayout.OnOffsetChangedListener() {            @Override            public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) {                int toolbarHeight = appBarLayout.getTotalScrollRange();                int dy = Math.abs(verticalOffset);                if (dy <= toolbarHeight) {                    float scale = (float) dy / toolbarHeight;                    float alpha = scale * 255;                    ll_top.setBackgroundColor(Color.argb((int) alpha, 54, 161, 70));                }            }        });

效果图如下：

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