CoordinatorLayout 属性详解 和 Behavior 的使用

关于 CoordinatorLayout 写过例子  点击打开链接 链接是以前写的联动效果的例子，但是一直没有总结，其实CoordinatorLayout就是一个联动的布局动画效果，不用代码，就xml布局就能实现很多动画效果 。

1.首先来个简单的，先看效果图上推时从1到2

                  toolbar消失

接着代码：

<?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"
    tools:context=".activity.TabActivity">
    
    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

        <android.support.v7.widget.Toolbar
            android:id="@+id/tool_bar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:layout_scrollFlags="scroll|enterAlways|snap"
            app:popupTheme="@style/ThemeOverlay.AppCompat.Light"/>

        <android.support.design.widget.TabLayout
            android:id="@+id/tab_layout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
    </android.support.design.widget.AppBarLayout>

    <android.support.v4.view.ViewPager
        android:id="@+id/view_pager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"/>
</android.support.design.widget.CoordinatorLayout>

对上述代码分析：

 首先第一个属性：scrollflag:要和滚动联动都要设置这个标志，有一下几个值：
    1》enterAlways:跟随滚动视图的上下滚动，滚出屏幕，
    2》enterAlwaysCollapsed:当滚动视图滚动到底时，View只能以minHeight的高度滚入界面;
    3》exitUntilCollapsed:跟随滚动视图的上下滚动,但滚出时会预留minHeight的高度，实际能滚动的距离为  (layout_height-minHeight);
    4》snap:根据滚动释放时的状态来自动执行完整的enter或者exit动画;
 第二个属性：app:layout_behavior="@string/appbar_scrolling_view_behavior"-把滚动的内容设置在appbar下面，不然appbar会变为透明，并且滚动的内容会显示在（0,0）坐标

2.第二个例子上推从1到2

     

  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="com.dl7.coordinator.activity.ScrollActivity">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/app_bar"
        android:fitsSystemWindows="true"
        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="wrap_content"
            android:fitsSystemWindows="true"
            app:contentScrim="@color/colorPrimary"
            app:expandedTitleMarginStart="20dp"
            app:layout_scrollFlags="scroll|exitUntilCollapsed|snap">

            <ImageView
                android:layout_width="match_parent"
                android:layout_height="200dp"
                android:fitsSystemWindows="true"
                android:scaleType="centerCrop"
                android:src="@mipmap/pic"
                app:layout_collapseParallaxMultiplier="0.6"
                app:layout_collapseMode="parallax"/>

            <android.support.v7.widget.Toolbar
                android:id="@+id/tool_bar"
                android:layout_width="match_parent"
                app:theme="@style/ThemeOverlay.AppCompat.Dark"
                android:layout_height="?attr/actionBarSize"
                app:layout_collapseMode="pin"/>
        </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">

        <!-- 滚动的内容 -->
        <include layout="@layout/layout_scroll_content"/>
    </android.support.v4.widget.NestedScrollView>
    <android.support.design.widget.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_anchor="@id/app_bar"
        app:layout_anchorGravity="bottom|right"
        android:layout_margin="16dp"
        android:src="@mipmap/ic_start"/>
</android.support.design.widget.CoordinatorLayout>

 代码分析：

      1》CollapsingToolbarLayout 会去自动获取Toolbar的高度设为滚动后的最小高度minHeight
      2》app:layout_collapseMode="parallax":视差模式，在折叠的时候会有个视差折叠的效果。与               app:layout_collapseParallaxMultiplier:配合使用。当滚动的时候设置视差滚动系数 0~1 视差显示图片是上移动的，等于 1 图片是固定不动的，大于 1 图片是向下移动，然后toolbar显示。
      3》app:layout_collapseMode="pin":固定模式，这个属性是在滚动的时候，最终在屏幕顶端固定的view，该view不会滑出屏幕，会被固定在顶端。
      4》app:expandedTitleMarginStart="20dp" - 表示头部展开时 title 距离左侧的距离大小
      5》app:layout_anchor和app:layout_anchorGravity来实现联动;
      app:layout_anchor="@id/app_bar":用来设置与id所关联的控件进行协调，即AppBarLayout;
      app:layout_anchorGravity="bottom|right":用来设置与关联控件的位置关系;

      6》app:layout_scrollFlags="scroll|exitUntilCollapsed|snap"，这个属性设置滚动到顶部，此view就停止上移，被固定在顶部。

第三个例子，CoordinatorLayout 与 Behavior 联动

效果图

 

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"
    tools:context="com.dl7.coordinator.activity.CustomBehaviorActivity">

    <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/bane"
                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="@dimen/toolbar_height"
                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.dl7.coordinator.behavior.AvatarBehavior"/>
</android.support.design.widget.CoordinatorLayout>

app:layout_behavior="com.dl7.coordinator.behavior.AvatarBehavior"

AvatarBehavior的布局：

package com.dl7.coordinator.behavior;

import android.content.Context;
import android.content.res.TypedArray;
import android.os.Build;
import android.support.design.widget.AppBarLayout;
import android.support.design.widget.CollapsingToolbarLayout;
import android.support.design.widget.CoordinatorLayout;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.View;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.DecelerateInterpolator;
import android.widget.FrameLayout;

import com.dl7.coordinator.R;
import com.dl7.coordinator.utils.AnimHelper;

import de.hdodenhof.circleimageview.CircleImageView;

/**  * Created by long on 2016/7/11.  * 头像Behavior  */ 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;
        }
    }
}

看了一个人的例子，然后总结了一下。