该布局支持布局头部可缩放，在一些资讯类的APP会经常用到。
效果图

效果图

1. 添加依赖

maven { url 'https://jitpack.io' }

dependencies {
  compile 'com.github.iammert:ScalingLayout:1.1'
}

2. 在xml布局添加控件

<iammert.com.view.scalinglib.ScalingLayout
        android:id="@+id/scalingLayout"
        android:layout_width="300dp"
        android:layout_height="48dp"
        app:radiusFactor="1">
        
        <!-- Your content here -->
        
</iammert.com.view.scalinglib.ScalingLayout>

3. Java代码设置

scalingLayout.expand(); //use this if you want to expand all
scalingLayout.collapse(); //user this if you want to collapse view to initial state.
scalingLayout.setProgress(float progress); //1 is fully expanded, 0 is initial state.

scalingLayout.setListener(new ScalingLayoutListener() {
    @Override
    public void onCollapsed() {}

    @Override
    public void onExpanded() {}

    @Override
    public void onProgress(float progress) {}
});

更多使用方法请参考其GitHub。