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Toobar和TabLayout等发生的一系列故事,简单理解

来源:http://www.ccidsi.com 作者:集成经验 人气:102 发布时间:2020-03-13
摘要:本文出自 “阿敏其人” 简书博客,转发或援引请评释出处。 CoordinatorLayout与AppBarLayout AppBarLayout嵌套TabLayout ?xml version="1.0" encoding="utf-8"?android.support.design.widget.CoordinatorLayout xmlns:android=

本文出自 “阿敏其人” 简书博客,转发或援引请评释出处。

CoordinatorLayout与AppBarLayout

  • AppBarLayout嵌套TabLayout
<?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"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:context=".MainActivity">

    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/AppBarOverlay">

        <android.support.v7.widget.Toolbar
            android:id="@ id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"

            app:layout_scrollFlags="scroll|enterAlways"
            app:popupTheme="@style/PopupOverlay" />

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


    <FrameLayout
        android:id="@ id/fragment_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
        />

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

scroll: 全数想滚动出荧屏的view都亟待设置那几个flag, 未有安装那个flag的view将被固定在显示屏最上端。比如,TabLayout 未有设置那么些值,将会滞留在荧屏最上部。
enterAlways: 设置那个flag时,向下的轮转都会形成该view变为可以预知,启用急迅“重返格局”。
enterAlwaysCollapsed: 当你的视图已经安装minHeight属性又采纳此标识时,你的视图只可以已超级小高度走入,只有当滚动视图到达顶端时才扩充到全部中度。
exitUntilCollapsed: 滚动退出显示屏,最终折叠在上面。
为了ToolBar能够滚动,CoordinatorLayout里面,放多个暗含可滚动的View.如上的例证,放的是ViewPager,而ViewPager里面是放了RecylerView的,就是能够滚动的View。CoordinatorLayout包涵的子视图中带有滚动属性的View供给设置app:layout_behavior属性。举例,示例中Viewpager设置了此属性。

  • app:layout_behavior="@string/appbar_scrolling_view_behavior"

为了使得Toolbar有滑动作效果果,必得已毕如下三点:

  1. CoordinatorLayout作为布局的父结构容器。
  2. 给必要滑动的组件设置 app:layout_scrollFlags=”scroll|enterAlways” 属性。
  3. 给滑动的零器件设置app:layout_behavior属性
  • AppBarLayout嵌套CollapsingToolbarLayout
    构造文件代码:
<?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"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:context="aohuan.com.recyclerviewdemo.SecondActivity">

    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="200dp"
        android:fitsSystemWindows="true"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
        <android.support.design.widget.CollapsingToolbarLayout
            android:id="@ id/collapsing_toolbar"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:fitsSystemWindows="true"
            app:contentScrim="?attr/colorPrimary"
            app:expandedTitleMarginEnd="64dp"
            app:expandedTitleMarginStart="48dp"
            app:layout_scrollFlags="scroll|exitUntilCollapsed"
            >
            <ImageView
                android:id="@ id/m_iv_backdrop"
                android:layout_height="match_parent"
                android:layout_width="match_parent"
                android:fitsSystemWindows="true"
                android:scaleType="centerCrop"
                android:src="@drawable/ic_launcher"
                />
            <android.support.v7.widget.Toolbar
                android:id="@ id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
              app:layout_collapseMode="pin"
                app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
        </android.support.design.widget.CollapsingToolbarLayout>

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

    <FrameLayout
        android:id="@ id/fragment_colto"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
        />

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

这种效果在实际情况页面用的比较多,显示特性化内容,图像有明显的吸重力。那个效应注重使用了CollapsingToolbarLayout 。
CollapsingToolbarLayout可完结Toolbar的折叠功效。CollapsingToolbarLayout的子视图雷同与LinearLayout垂直方向排泄。

CollapsingToolbarLayout 提供以下属性和章程是用:

  1. Collapsing title:ToolBar的标题,当CollapsingToolbarLayout全屏未有折叠时,title呈现的是大字体,在折叠的进度中,title不断变小到早晚大小的功能。你能够调用setTitle(CharSequence卡塔尔(قطر‎方法设置title。
  2. Content scrim:ToolBar被折叠到最上端稳依期候的背景,你能够调用setContentScrim(Drawable卡塔尔方法纠正背景也许在性质中动用 app:contentScrim=”?attr/colorPrimary”来校正背景。
  3. Status bar scrim:状态栏的背景,调用方法setStatusBarScrim(Drawable卡塔尔国。还未商讨清楚,可是那几个只好在Android5.0上述系统有效益。
  4. Parallax scrolling children:CollapsingToolbarLayout滑动时,子视图的视觉差,能够透过属性app:layout_collapseParallaxMultiplier=”0.6”改变。值de的范围[0.0,1.0],值越大检查越大。
  5. CollapseMode :子视图的折叠格局,在子视图设置,有二种“pin”:固定方式,在折叠的时候最终牢固在上方;“parallax”:视差方式,在折叠的时候会有个视差折叠的效率。大家得以在结构中动用属性app:layout_collapseMode=”parallax”来改变。

CoordinatorLayout 还提供了一个 layout_anchor 的属性,连同 layout_anchorGravity 一齐,能够用来放置与其余视图关联在协同的悬浮视图(如 FloatingActionButton)。本例中动用FloatingActionButton。

经过上边包车型地铁参数设置了FloatingActionButton的岗位,七个特性合营作用使得FAB 浮动开关也能折叠消失,表现。

动用CollapsingToolbarLayout达成折叠作用,须要潜心3点

  1. AppBarLayout的万丈稳定
  2. CollapsingToolbarLayout的子视图设置layout_collapseMode属性
  3. 提到悬浮视图设置app:layout_anchor,app:layout_anchorGravity属性
一、简述CoordinatorLayout

原理请看这里 Android design包中CoordinatorLayout的计划原理
再看看facebook的效果

1018039-920fa0d9d86fa68b.gif

下边直接贴网络部分经文德姆o

正文首要涉嫌android里面md设计的多少个控件CoordinatorLayoutAppBarLayoutCollapsingToolbarLayoutTabLayout

事例一:后面部分菜单抽屉效果

正文假若是读者还未利用过adnroid support md的控件,先来看一下图纸:

1 增多信赖
compile 'com.android.support:appcompat-v7:25.1.1'

图片 1海贼王演示.gif

2 xml
<?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:id="@ id/coordinator"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true">


    <android.support.v4.widget.NestedScrollView
        android:id="@ id/nestedScrollView"
        android:layout_width="match_parent"
        android:layout_height="350dp"
        android:background="@mipmap/ic_launcher"
        app:layout_behavior="@string/bottom_sheet_behavior"
        app:behavior_peekHeight="0dp"
        app:behavior_hideable="true">
        <!--中间可以随意写自己的布局-->

    </android.support.v4.widget.NestedScrollView>

    <android.support.design.widget.FloatingActionButton
        android:id="@ id/fabs"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:layout_margin="@dimen/fab_margin"
        app:srcCompat="@android:drawable/ic_dialog_email" />


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

我们见到,标题栏能够伸缩,何况顶端状态栏是沉浸的,颜色沉浸,图片沉浸。

2 Activity
    @BindView(R.id.coordinator)
    CoordinatorLayout coordinator;

    @BindView(R.id.nestedScrollView)
    NestedScrollView scrollView;

    @BindView(R.id.fabs)
    FloatingActionButton fab;

    @Override
    protected int setLayoutResourceID() {
        return R.layout.activity_hellow;
    }

    @Override
    protected void setUpView() {
       fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //点击出现底部菜单
                BottomSheetBehavior bottomSheetBehavior = BottomSheetBehavior.from(scrollView);
                bottomSheetBehavior.setState(bottomSheetBehavior.getState() == BottomSheetBehavior.STATE_COLLAPSED?BottomSheetBehavior.STATE_EXPANDED:BottomSheetBehavior.STATE_COLLAPSED);
            }
        });
    }

噢,那看看是怎么贯彻的吧。张开布局文件开掘代码如下:

福如东海的关键点:

1 根结构为 CoordinatorLayout;
2 为尾部弹出框设置app:layout_behavior="@string/bottom_sheet_behavior";
3 在代码中得到BottomSheetBehavior(尾巴部分菜单),并动态改造它的动静;
4至于FloatingActionButton跟随弹出框移动,关键点在于为FloatingActionButton设置
5app:layout_behavior="@string/bottom_sheet_behavior"appbar_scrolling_view_behavior并不是三个字符串,而是二个类,而且以此类我们得以自定义。

<?xml version="1.0" encoding="utf-8"?><android.support.design.widget.CoordinatorLayout xmlns:andro xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent" android:fitsSystemWindows="true"> <android.support.design.widget.AppBarLayout android:layout_width="match_parent" android:layout_height="256dp" android:fitsSystemWindows="true" android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"> <android.support.design.widget.CollapsingToolbarLayout android: android:layout_width="match_parent" android:layout_height="match_parent" android:fitsSystemWindows="true" app:contentScrim="?attr/colorPrimary" app:expandedTitleMarginEnd="64dp" app:expandedTitleMarginStart="48dp" app:layout_scrollFlags="scroll|exitUntilCollapsed"> <ImageView android: android:layout_width="match_parent" android:layout_height="match_parent" android:fitsSystemWindows="true" android:transitionName="transition_book_img" android:scaleType="centerCrop" app:layout_collapseMode="parallax" app:layout_collapseParallaxMultiplier="0.7" /> <android.support.v7.widget.Toolbar android: android:layout_width="match_parent" android:layout_height="?attr/actionBarSize" app:layout_collapseMode="pin" app:popupTheme="@style/ThemeOverlay.AppCompat.Light" /> </android.support.design.widget.CollapsingToolbarLayout> </android.support.design.widget.AppBarLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" app:layout_behavior="@string/appbar_scrolling_view_behavior"> <android.support.design.widget.TabLayout android: android:layout_width="match_parent" android:layout_height="wrap_content" app:tabGravity="fill" app:tabMode="fixed" /> <android.support.v4.view.ViewPager android: android:layout_width="match_parent" android:layout_height="match_parent" /> </LinearLayout> </android.support.design.widget.CoordinatorLayout>
例子二:AppBarLayout

一看,瓦擦,大多没见过

1 xml
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <android.support.design.widget.AppBarLayout
        android:id="@ id/main_appbarlayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <android.support.v7.widget.Toolbar
            android:id="@ id/main_toolbar"
            app:title="@string/app_name"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"/>
    </android.support.design.widget.AppBarLayout>

    <android.support.v4.widget.NestedScrollView 
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
         <!--中间可以随意写自己的布局-->
    </android.support.v4.widget.NestedScrollView>

</android.support.design.widget.CoordinatorLayout>
CoordinatorLayout AppBarLayoutCollapsingToolbarLayoutTabLayoutandroid:fitsSystemWindows="true"android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"app:contentScrim="?attr/colorPrimary"app:layout_scrollFlags="scroll|exitUntilCollapsed"android:transitionName="transition_book_img"app:layout_collapseParallaxMultiplier="0.7" app:layout_collapseMode="pin"app:popupTheme="@style/ThemeOverlay.AppCompat.Light" app:popupTheme="@style/ThemeOverlay.AppCompat.Light" app:tabGravity="fill" app:tabMode="fixed"
属性介绍
layout_scrollFlags

AppBarLayout中的子控件通过layout_scrollFlags这些脾气也许setScrollFlags技术展现出他们的轮转行为。它的值有:scroll、snap、enterAlways、enterAlwaysCollapsed、exitUntilCollapsed。

scrol:全部想滚动的view都必要设置这几个flag, 未有设置那个flag的view将被固化在显示屏顶上部分。那么些我们早已见识过了
snap:那个向来翻译成“折断”。便是说被"关心"的View即便展现了八分之四,就全呈现出来,不可是藏身。

app:layout_scrollFlags="scroll|snap"

app:layout_scrollFlags="scroll|snap"

enterAlways:往上海好笑剧团动的时候被"关切"的这么些View蒙蔽,往下滑的时候显得

app:layout_scrollFlags="scroll|enterAlways"

app:layout_scrollFlags="scroll|enterAlways"

enterAlwaysCollapsed:向上滑动的时候被"关注"的这几个View掩瞒,向下滑动时先表现二个纤维中度,等到滑动到NestedScrollView最最上端的时候再完全彰显出来。小心那边应当要有八个渺小中度,即minHeight属性,而且enterAlwaysCollapsed一定要搭配enterAlways和scroll技艺健康表现

<android.support.v7.widget.Toolbar 
    android:id="@ id/main_toolbar"
    app:title="@string/app_name"
    app:layout_scrollFlags="scroll|enterAlways|enterAlwaysCollapsed"
    android:layout_width="match_parent"
    android:layout_height="200dip"
    android:minHeight="?attr/actionBarSize"/>

app:layout_scrollFlags="scroll|enterAlways|enterAlwaysCollapsed"

重重东西,都以什么鬼。可是万幸,抛去属性,控件不认知的也就4个。他们的包蕴关系大概如下:

若果您的AppBarLayout中包涵其余的View,那么带有layout_scrollFlags的竹签的View请结构在前边。因为AppBarLayout实际上是叁个LinearLayout。

图片 2Paste_Image.png

例子三:折叠的Toolbar

CollapsingToolbarLayout提供了三个方可折叠的Toolbar,它三翻五次FrameLayout。给它设置layout_scrollFlags,它能够操纵饱含在其间的子控件(如:ImageView、Toolbar卡塔尔(قطر‎。

哦,那就先看看那多少个控件吧,熟谙一下。

1 xml
<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/main_appbarlayout"
        android:layout_width="match_parent"
        android:layout_height="200dip">

        <android.support.design.widget.CollapsingToolbarLayout 
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:expandedTitleMarginStart="64dp"
            app:expandedTitleMarginEnd="64dp"
            app:contentScrim="?attr/colorPrimaryDark"
            app:layout_scrollFlags="scroll|exitUntilCollapsed">
            <ImageView
                android:src="@mipmap/bg"
                app:layout_collapseParallaxMultiplier="0.5"
                app:layout_collapseMode="parallax"
                android:scaleType="centerCrop"
                android:layout_width="match_parent"
                android:layout_height="match_parent" />
            <android.support.v7.widget.Toolbar
                app:title="@string/app_name"
                app:layout_collapseMode="pin"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"/>
          </android.support.design.widget.CollapsingToolbarLayout>

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

    <android.support.v4.widget.NestedScrollView 
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <!-- 自己布局 -->
    </android.support.v4.widget.NestedScrollView>

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

1018039-e7f47d571d8b5bfb.gif

有关属性

Android dev CoordinatorLayout官方网址学习材质

layout_collapseMode

有2种模式,
pin模式:即定位形式,在折叠的时候最终一定在上方
parallax模式:即视差情势,在折叠的时候会有个视差折叠的功用

人家Google这么说

layout_collapseParallaxMultiplier

CollapsingToolbarLayout滑动时,子视图的视觉差。这一个值的限量为0.0-1.0之内。为0的时候,你能够以为到到视图完全随NestedScrollView滚动;为1的时候,如同又是一心不滚动

CoordinatorLayout is a super-powered FrameLayout.CoordinatorLayout is intended for two primary use cases:As a top-level application decor or chrome layoutAs a container for a specific interaction with one or more child viewsBy specifying Behaviors for child views of a CoordinatorLayout you can provide many different interactions within a single parent and those views can also interact with one another. View classes can specify a default behavior when used as a child of a CoordinatorLayout using the DefaultBehavior annotation.Behaviors may be used to implement a variety of interactions and additional layout modifications ranging from sliding drawers and panels to swipe-dismissable elements and buttons that stick to other elements as they move and animate.Children of a CoordinatorLayout may have an anchor. This view id must correspond to an arbitrary descendant of the CoordinatorLayout, but it may not be the anchored child itself or a descendant of the anchored child. This can be used to place floating views relative to other arbitrary content panes.
contentScrim

那是ToolBar被折叠到顶上部分一定后的背景。

大约也正是那般说:

expandedTitleMarginStart/expandedTitleMarginEnd

在ToolBar被折叠前文字部分的左右距离

CoordinatorLayout 是二个加强版的FrameLayout。(世袭自ViewGroup)

setExpandedTitleColor/setCollapsedTitleTextColor

设置还未缩短时场地下字体颜色与减弱后Toolbar上字体的颜色

关键有三个用处:1、作为顶层应用的装裱还是chrome构造2、作为叁个器皿来和睦一个或多个子views

setTitle

应用CollapsingToolbarLayout时必须把title设置到CollapsingToolbarLayout上,设置到Toolbar上不交易会示

CoordinatorLayout,Coordinator有和谐的乐趣。它是三个足以团体众多子view之间互相协作的一个ViewGroup

事例四:同步移动

先看效果

2800913-45ea0c7812fa7a12.gif

CoordinatorLayout 有一个Behavior,那几个指标能够说让子view直接知道了彼此的存在,通过差别的状态监听支配别的子View的位移仍旧隐藏与显示等。

DodoMoveView
**
 * @创建 HaiJia
 * @时间 2017/3/10 11:21
 * @描述 可拖动的View
 */

public class DodoMoveView extends TextView{

    private int lastX;
    private int lastY;


    public DodoMoveView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        int x = (int) event.getRawX();
        int y = (int) event.getRawY();

        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                break;

            case MotionEvent.ACTION_MOVE:
                CoordinatorLayout.MarginLayoutParams layoutParams = 
                (CoordinatorLayout.MarginLayoutParams) getLayoutParams();
                int left = layoutParams.leftMargin   x - lastX;
                int top = layoutParams.topMargin   y - lastY;

                layoutParams.leftMargin = left;
                layoutParams.topMargin = top;
                setLayoutParams(layoutParams);
                requestLayout();
                break;

            case MotionEvent.ACTION_UP:
                break;
        }
        lastX = x;
        lastY = y;
        //如果返回值是true,代表事件在当前的viewGroup中会被处理,
        //向下传递之路被截断(所有子控件将没有机会参与Touch事件),
        // 同时把事件传递给当前的控件的onTouchEvent()处理。
        return true;
    }
}

然后简短改进Behavior

public class DodoBehavior0s extends CoordinatorLayout.Behavior<Button>{

    private Context mContext;

    private int width;
    private int height;

    public DodoBehavior0s(Context context, AttributeSet attrs) {
        super(context, attrs);
        this.mContext = context;
        DisplayMetrics display = context.getResources().getDisplayMetrics();
        width = display.widthPixels;
        height = display.heightPixels;
    }

    @Override
    public boolean layoutDependsOn(CoordinatorLayout parent, Button child, View dependency) {
        //如果dependency是TempView的实例,说明它就是我们所需要的Dependency
        return dependency instanceof DodoMoveView;
    }

    //每次dependency位置发生变化,都会执行onDependentViewChanged方法
    @Override
    public boolean onDependentViewChanged(CoordinatorLayout parent, Button btn, View dependency) {

        //根据dependency的位置,设置Button的位置

        int top = dependency.getTop();
        int left = dependency.getLeft();

        int x = width - left - btn.getWidth();
        int y = height - top - btn.getHeight();

        setPosition(btn, x, y);
        return true;
    }

    private void setPosition(View v, int x, int y) {
        CoordinatorLayout.MarginLayoutParams layoutParams = (CoordinatorLayout.MarginLayoutParams) v.getLayoutParams();
        layoutParams.leftMargin = x;
        layoutParams.topMargin = y;
        layoutParams.width = y/2;
        v.setLayoutParams(layoutParams);
    }
}

功用如下

2800913-9d0211e3e8802f09.gif

1、使用早先引入

三、别的种种功能德姆o
compile 'com.android.support:appcompat-v7:23.4.0'compile 'com.android.support:design:23.4.0'
1、BackBehavior

快速回到效果的Behavior,依照AppBarLayout的滚动来支配自定义View的轮转

1018039-5d44d427cea2929e.gif

2、布局文件

2、项目可用的德姆o

CoordinatorLayoutSample
CoordinatorBehaviorExample

2267876-d4f42ee04a3d2760.gif

屈居关键源码

<?xml version="1.0" encoding="utf-8"?><android.support.design.widget.CoordinatorLayout xmlns:andro xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent"> <android.support.design.widget.FloatingActionButton android: android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="end|bottom" android:layout_margin="16dp" android:src="@mipmap/ic_launcher" /></android.support.design.widget.CoordinatorLayout>
xml
<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/app_bar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

        <android.support.design.widget.CollapsingToolbarLayout
            android:id="@ id/collapsing_tool_bar"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:contentScrim="@color/colorPrimary"
            app:expandedTitleGravity="bottom|center_horizontal"
            app:layout_scrollFlags="scroll|exitUntilCollapsed|snap">

            <ImageView
                android:id="@ id/iv_head"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:scaleType="fitXY"
                android:src="@mipmap/dd"
                app:layout_collapseMode="parallax"
                app:layout_collapseParallaxMultiplier="0.6"/>

            <!-- 设置app:navigationIcon="@android:color/transparent"给头像预留位置 -->
            <android.support.v7.widget.Toolbar
                android:id="@ id/tool_bar"
                android:layout_width="match_parent"
                android:layout_height="50dp"
                app:layout_collapseMode="pin"
                app:navigationIcon="@android:color/transparent"
                app:theme="@style/ThemeOverlay.AppCompat.Dark"
                app:title="Tom Hardy"/>
        </android.support.design.widget.CollapsingToolbarLayout>
    </android.support.design.widget.AppBarLayout>

    <android.support.v4.widget.NestedScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior">

        <include layout="@layout/layout_content_tom"/>
    </android.support.v4.widget.NestedScrollView>

    <!-- layout_anchor属性5.0以上需要设置为CollapsingToolbarLayout,不然头像最后会被覆盖 -->
    <de.hdodenhof.circleimageview.CircleImageView
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:layout_margin="16dp"
        android:src="@mipmap/tom"
        app:border_color="@android:color/white"
        app:border_width="1dp"
        app:layout_anchor="@id/collapsing_tool_bar"
        app:layout_anchorGravity="bottom|right"
        app:layout_behavior="com.haijia.demo.behavior.AvatarBehavior"/>
</android.support.design.widget.CoordinatorLayout>

3、Activity

layout_content_tom.xml
<?xml version="1.0" encoding="utf-8"?>

<android.support.v7.widget.CardView
    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="wrap_content"
    android:layout_marginTop="5dp"
    app:cardCornerRadius="5dp"
    app:cardElevation="8dp"
    app:cardPreventCornerOverlap="false"
    app:cardUseCompatPadding="true">

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

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:layout_marginRight="10dp"
            android:layout_marginTop="10dp"
            android:orientation="horizontal">

            <TextView
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="Date of Birth"
                android:textAppearance="@style/TextAppearance.AppCompat.Body2"/>

            <TextView
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="3"
                android:text="15 September 1977, Hammersmith, London, England, UK"/>
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:layout_marginRight="10dp"
            android:layout_marginTop="10dp"
            android:orientation="horizontal">

            <TextView
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="Birth Name"
                android:textAppearance="@style/TextAppearance.AppCompat.Body2"/>

            <TextView
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="3"
                android:text="Edward Thomas Hardy"/>
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="10dp"
            android:layout_marginLeft="10dp"
            android:layout_marginRight="10dp"
            android:layout_marginTop="10dp"
            android:orientation="horizontal">

            <TextView
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="Height"
                android:textAppearance="@style/TextAppearance.AppCompat.Body2"/>

            <TextView
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="3"
                android:text="(1.75 m)"/>
        </LinearLayout>

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="10dp"
            android:text="黄海佳"/>
    </LinearLayout>
</android.support.v7.widget.CardView>
public class CoordinatorLayoutActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_coordinator); findViewById.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { Snackbar.make(view,"FAB",Snackbar.LENGTH_LONG) .setAction("cancel", new View.OnClickListener() { @Override public void onClick { //这里的单击事件代表点击消除Action后的响应事件 } }) .show; }}
AvatarBehavior
public class AvatarBehavior extends CoordinatorLayout.Behavior<CircleImageView> {

    // 缩放动画变化的支点
    private static final float ANIM_CHANGE_POINT = 0.2f;

    private Context mContext;
    // 整个滚动的范围
    private int mTotalScrollRange;
    // AppBarLayout高度
    private int mAppBarHeight;
    // AppBarLayout宽度
    private int mAppBarWidth;
    // 控件原始大小
    private int mOriginalSize;
    // 控件最终大小
    private int mFinalSize;
    // 控件最终缩放的尺寸,设置坐标值需要算上该值
    private float mScaleSize;
    // 原始x坐标
    private float mOriginalX;
    // 最终x坐标
    private float mFinalX;
    // 起始y坐标
    private float mOriginalY;
    // 最终y坐标
    private float mFinalY;
    // ToolBar高度
    private int mToolBarHeight;
    // AppBar的起始Y坐标
    private float mAppBarStartY;
    // 滚动执行百分比[0~1]
    private float mPercent;
    // Y轴移动插值器
    private DecelerateInterpolator mMoveYInterpolator;
    // X轴移动插值器
    private AccelerateInterpolator mMoveXInterpolator;
    // 最终变换的视图,因为在5.0以上AppBarLayout在收缩到最终状态会覆盖变换后的视图,所以添加一个最终显示的图片
    private CircleImageView mFinalView;
    // 最终变换的视图离底部的大小
    private int mFinalViewMarginBottom;


    public AvatarBehavior(Context context, AttributeSet attrs) {
        super(context, attrs);
        mContext = context;
        mMoveYInterpolator = new DecelerateInterpolator();
        mMoveXInterpolator = new AccelerateInterpolator();
        if (attrs != null) {
            TypedArray a = mContext.obtainStyledAttributes(attrs, R.styleable.AvatarImageBehavior);
            mFinalSize = (int) a.getDimension(R.styleable.AvatarImageBehavior_finalSize, 0);
            mFinalX = a.getDimension(R.styleable.AvatarImageBehavior_finalX, 0);
            mToolBarHeight = (int) a.getDimension(R.styleable.AvatarImageBehavior_toolBarHeight, 0);
            a.recycle();
        }
    }

    @Override
    public boolean layoutDependsOn(CoordinatorLayout parent, CircleImageView child, View dependency) {
        return dependency instanceof AppBarLayout;
    }

    @Override
    public boolean onDependentViewChanged(CoordinatorLayout parent, CircleImageView child, View dependency) {

        if (dependency instanceof AppBarLayout) {
            _initVariables(child, dependency);

            mPercent = (mAppBarStartY - dependency.getY()) * 1.0f / mTotalScrollRange;

            float percentY = mMoveYInterpolator.getInterpolation(mPercent);
            AnimHelper.setViewY(child, mOriginalY, mFinalY - mScaleSize, percentY);

            if (mPercent > ANIM_CHANGE_POINT) {
                float scalePercent = (mPercent - ANIM_CHANGE_POINT) / (1 - ANIM_CHANGE_POINT);
                float percentX = mMoveXInterpolator.getInterpolation(scalePercent);
                AnimHelper.scaleView(child, mOriginalSize, mFinalSize, scalePercent);
                AnimHelper.setViewX(child, mOriginalX, mFinalX - mScaleSize, percentX);
            } else {
                AnimHelper.scaleView(child, mOriginalSize, mFinalSize, 0);
                AnimHelper.setViewX(child, mOriginalX, mFinalX - mScaleSize, 0);
            }
            if (mFinalView != null) {
                if (percentY == 1.0f) {
                    // 滚动到顶时才显示
                    mFinalView.setVisibility(View.VISIBLE);
                } else {
                    mFinalView.setVisibility(View.GONE);
                }
            }
        } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP && dependency instanceof CollapsingToolbarLayout) {
            // 大于5.0才生成新的最终的头像,因为5.0以上AppBarLayout会覆盖变换后的头像
            if (mFinalView == null && mFinalSize != 0 && mFinalX != 0 && mFinalViewMarginBottom != 0) {
                mFinalView = new CircleImageView(mContext);
                mFinalView.setVisibility(View.GONE);
                // 添加为CollapsingToolbarLayout子视图
                ((CollapsingToolbarLayout) dependency).addView(mFinalView);
                FrameLayout.LayoutParams params = (FrameLayout.LayoutParams) mFinalView.getLayoutParams();
                // 设置大小
                params.width = mFinalSize;
                params.height = mFinalSize;
                // 设置位置,最后显示时相当于变换后的头像位置
                params.gravity = Gravity.BOTTOM;
                params.leftMargin = (int) mFinalX;
                params.bottomMargin = mFinalViewMarginBottom;
                mFinalView.setLayoutParams(params);
                mFinalView.setImageDrawable(child.getDrawable());
                mFinalView.setBorderColor(child.getBorderColor());
                int borderWidth = (int) ((mFinalSize * 1.0f / mOriginalSize) * child.getBorderWidth());
                mFinalView.setBorderWidth(borderWidth);
            }
        }

        return true;
    }

    /**
     * 初始化变量
     * @param child
     * @param dependency
     */
    private void _initVariables(CircleImageView child, View dependency) {
        if (mAppBarHeight == 0) {
            mAppBarHeight = dependency.getHeight();
            mAppBarStartY = dependency.getY();
        }
        if (mTotalScrollRange == 0) {
            mTotalScrollRange = ((AppBarLayout) dependency).getTotalScrollRange();
        }
        if (mOriginalSize == 0) {
            mOriginalSize = child.getWidth();
        }
        if (mFinalSize == 0) {
            mFinalSize = mContext.getResources().getDimensionPixelSize(R.dimen.avatar_final_size);
        }
        if (mAppBarWidth == 0) {
            mAppBarWidth = dependency.getWidth();
        }
        if (mOriginalX == 0) {
            mOriginalX = child.getX();
        }
        if (mFinalX == 0) {
            mFinalX = mContext.getResources().getDimensionPixelSize(R.dimen.avatar_final_x);
        }
        if (mOriginalY == 0) {
            mOriginalY = child.getY();
        }
        if (mFinalY == 0) {
            if (mToolBarHeight == 0) {
                mToolBarHeight = mContext.getResources().getDimensionPixelSize(R.dimen.toolbar_height);
            }
            mFinalY = (mToolBarHeight - mFinalSize) / 2   mAppBarStartY;
        }
        if (mScaleSize == 0) {
            mScaleSize = (mOriginalSize - mFinalSize) * 1.0f / 2;
        }
        if (mFinalViewMarginBottom == 0) {
            mFinalViewMarginBottom = (mToolBarHeight - mFinalSize) / 2;
        }
    }
}

4、效果:

图片 3应用.gif

  • 亮点在哪儿?当大家按下Snackbar的时候弹出来提醒的时候,按键的会做二个前行的卡通片,而大家的代码却没有供给做什么。

有关为何会这么动,那是因为FloatingActionButton默许使用FloatingActionButton.Behavior。关于Behavior,后边在说。

  • 怎么是Snackbar?一言以蔽之能够这么说,在Md的世界里 Snackbar 是 作为代替 Toast 而留存的好东西。

本来借使您不相信那个动漫是因为CoordinatorLayout才产生的,那么好,大家把代码改一下:

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:andro xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent"> <android.support.design.widget.FloatingActionButton android: android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="end|bottom" android:layout_margin="16dp" android:src="@mipmap/ic_launcher" /></RelativeLayout>

功能就改为那样子了

图片 4开关无动漫.gif

在里面CoordinatorLayout的社会风气里,Behavior侵夺了一个专程重要的地位。然后在上头Snackbar的小示例里面,因为系统暗中同意的关联大家连Behavior的身影都看出。那么上面依旧来弄几个小demo,关于Behavior。

CoordinatorLayout里面的间接子View日常是:AppBarLayout NestedScrollView。又涉及到了新东西,NestedScrollView辛亏,轻松认为三个是md涉及此中的ScrollView。至于AppBarLayout,依然得以掰扯的,另起一些,开讲。

深刻精晓Android开辟中的CoordinatorLayout Behavior

CoordinatorLayout里面包车型地铁直接子View平时是:AppBarLayout NestedScrollView。

Google NestedScrollView文档

NestedScrollView is just like ScrollView, but it supports acting as both a nested scrolling parent and child on both new and old versions of Android. Nested scrolling is enabled by default.

合营来拜候Google给大家的AppBarLayout 表明书吧:

AppBarLayout is a vertical LinearLayout which implements many of the features of material designs app bar concept, namely scrolling gestures.Children should provide their desired scrolling behavior through setScrollFlags and the associated layout xml attribute: app:layout_scrollFlags.This view depends heavily on being used as a direct child within a CoordinatorLayout. If you use AppBarLayout within a different ViewGroup, most of it's functionality will not work.AppBarLayout also requires a separate scrolling sibling in order to know when to scroll. The binding is done through the AppBarLayout.ScrollingViewBehavior behavior class, meaning that you should set your scrolling view's behavior to be an instance of AppBarLayout.ScrollingViewBehavior. A string resource containing the full class name is available.

谷歌差非常少就是说:

AppBarLayout是三个兑现了成百上千material designs性情的垂直的LinearLayout,它能响应滑动事件。

  • 1、AppBarLayout最好是CoordinatorLayout的直接子view

  • 2、AppBarLayout的子view:要求安装app:layout_scrollFlags ,大概是在代码中调用setScrollFlags(State of Qatar设置那个本性。

  • 3、AppBarLayout的兄弟节点(或兄弟节点的子view能够滚动):要求钦命behavior属性为AppBarLayout.ScrollingViewBehavior(能够利用二个置于的string表示那一个暗中认可的实例@string/appbar_scrolling_view_behavior.),技术公布它的最大的功能

瓦擦,看文字费事,那么看谷歌的亲自过问伪代码吧,认为世界弹指间清爽无数

 <android.support.design.widget.CoordinatorLayout xmlns:andro xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent"> <!-- 3、指定behavior属性为AppBarLayout.ScrollingViewBehavior --> <android.support.v4.widget.NestedScrollView android:layout_width="match_parent" android:layout_height="match_parent" app:layout_behavior="@string/appbar_scrolling_view_behavior"> <!-- Your scrolling content --> </android.support.v4.widget.NestedScrollView> <!--1、AppBarLayout最好是CoordinatorLayout的直接子view --> <android.support.design.widget.AppBarLayout android:layout_height="wrap_content" android:layout_width="match_parent"> <!--2 、AppBarLayout的子view:需要设置app:layout_scrollFlags--> <android.support.v7.widget.Toolbar ... app:layout_scrollFlags="scroll|enterAlways"/> <android.support.design.widget.TabLayout ... app:layout_scrollFlags="scroll|enterAlways"/> </android.support.design.widget.AppBarLayout> </android.support.design.widget.CoordinatorLayout> 

..

看似是那么回事了,来呢,

1、构造文件

本文由68399皇家赌场发布于集成经验,转载请注明出处:Toobar和TabLayout等发生的一系列故事,简单理解

关键词: 日记本 系列 Android... 发生

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