折叠工具栏布局，工具栏中带有徽标、标题、副标题

Question

我想这样做，但使用折叠工具栏布局或在滚动后在工具栏中显示徽标和标题。

    <!-- Toolbars -->
<android.support.design.widget.AppBarLayout
    android:id="@+id/appbar"
    android:layout_width="match_parent"
    android:layout_height="@dimen/detail_backdrop_height"
    android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
    android:fitsSystemWindows="true">

    <android.support.design.widget.CollapsingToolbarLayout
        android:id="@+id/collapsing_toolbar_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_scrollFlags="scroll|exitUntilCollapsed"
        app:contentScrim="?attr/colorPrimary"
        app:expandedTitleMarginStart="48dp"
        app:expandedTitleMarginEnd="64dp"
        android:fitsSystemWindows="true">

        <ImageView
            android:id="@+id/background_image"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:scaleType="centerCrop"
            android:src="@drawable/background_1"
            app:layout_collapseMode="parallax"
            android:fitsSystemWindows="true"/>

        <RelativeLayout
            android:orientation="vertical"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:fitsSystemWindows="true">

            <ImageView
                android:id="@+id/avatar_image"
                android:layout_width="@dimen/circular_image_avatar"
                android:layout_height="@dimen/circular_image_avatar"
                android:gravity="center"
                android:scaleType="centerCrop"
                android:src="@drawable/ic_placerholder"
                android:layout_centerVertical="true"
                android:layout_centerHorizontal="true"
                android:transitionName="image_toolbar"/>

            <TextView
                android:id="@+id/profile_title"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="Name title"
                android:textAlignment="center"
                android:layout_marginTop="@dimen/item_padding_top_bottom"
                android:gravity="center"
                style="@style/titleText_toolbar"
                android:layout_below="@+id/avatar_image"
                android:transitionName="title_toolbar"/>
            <TextView
                android:id="@+id/profile_subtitle"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="Subtitle"
                android:textAlignment="center"
                android:gravity="center"
                style="@style/captionText_toolbar"
                android:layout_below="@+id/profile_title" />

        </RelativeLayout>

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

            <!-- avatar image and title, subtitle -->

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

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

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

请帮帮我

Answer 1

我已经使用不使用自定义的方法预读了两个令人惊叹的头像折叠演示示例 CoordinatorLayoutBehavior！

查看我的示例本机代码："Collapsing Avatar Toolbar Sample"

在 Medium 上阅读我的 "Animation Collapsing Toolbar Android" post。

演示 1 demo 2

我没有使用自定义 CoordinatorLayoutBehavior，而是使用来自 AppBarLayout.

的 OnOffsetChangedListener

private lateinit var appBarLayout: AppBarLayout

override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_demo_1)
        ...
        appBarLayout = findViewById(R.id.app_bar_layout)

        /**/
        appBarLayout.addOnOffsetChangedListener(
                AppBarLayout.OnOffsetChangedListener { appBarLayout, i ->
                   ...
                    /**/
                    updateViews(Math.abs(i / appBarLayout.totalScrollRange.toFloat()))
                })
    }

演示 1

第一个demo中updateViews方法头像改变大小和改变头像的X,Y位置平移

private fun updateViews(offset: Float) {

        ...

        /* Collapse avatar img*/
        ivUserAvatar.apply {
            when {
                offset > avatarAnimateStartPointY -> {
                    val avatarCollapseAnimateOffset = (offset - avatarAnimateStartPointY) * avatarCollapseAnimationChangeWeight
                    val avatarSize = EXPAND_AVATAR_SIZE - (EXPAND_AVATAR_SIZE - COLLAPSE_IMAGE_SIZE) * avatarCollapseAnimateOffset
                    this.layoutParams.also {
                        it.height = Math.round(avatarSize)
                        it.width = Math.round(avatarSize)
                    }
                    invisibleTextViewWorkAround.setTextSize(TypedValue.COMPLEX_UNIT_PX, offset)

                    this.translationX = ((appBarLayout.width - horizontalToolbarAvatarMargin - avatarSize) / 2) * avatarCollapseAnimateOffset
                    this.translationY = ((toolbar.height  - verticalToolbarAvatarMargin - avatarSize ) / 2) * avatarCollapseAnimateOffset
                }
                else -> this.layoutParams.also {
                    if (it.height != EXPAND_AVATAR_SIZE.toInt()) {
                        it.height = EXPAND_AVATAR_SIZE.toInt()
                        it.width = EXPAND_AVATAR_SIZE.toInt()
                        this.layoutParams = it
                    }
                    translationX = 0f
                }
            }
        }
    }

找到avatarAnimateStartPointY和avatarCollapseAnimationChangeWeight（用于将一般偏移量转换为头像动画偏移量）：

private var avatarAnimateStartPointY: Float = 0F
 private var avatarCollapseAnimationChangeWeight: Float = 0F
 private var isCalculated = false
 private var verticalToolbarAvatarMargin =0F
...
if (isCalculated.not()) {
    avatarAnimateStartPointY = 
                 Math.abs((appBarLayout.height - (EXPAND_AVATAR_SIZE + horizontalToolbarAvatarMargin)) / appBarLayout.totalScrollRange)

    avatarCollapseAnimationChangeWeight = 1 / (1 - avatarAnimateStartPointY)

    verticalToolbarAvatarMargin = (toolbar.height - COLLAPSE_IMAGE_SIZE) * 2
    isCalculated = true
 }

演示 2

头像会改变他的大小，然后动画会在某一时刻向右移动，顶部工具栏文本会显示并向左移动。

您需要跟踪状态：TO_EXPANDED_STATE 变化，TO_COLLAPSED_STATE 变化，WAIT_FOR_SWITCH。

 /*Collapsed/expended sizes for views*/
            val result: Pair<Int, Int> = when {
                percentOffset < ABROAD -> {
                    Pair(TO_EXPANDED_STATE, cashCollapseState?.second ?: WAIT_FOR_SWITCH)
                }
                else -> {
                    Pair(TO_COLLAPSED_STATE, cashCollapseState?.second ?: WAIT_FOR_SWITCH)
                }
            }

在状态切换变化时为头像创建动画：

   result.apply {
        var translationY = 0f
        var headContainerHeight = 0f
        val translationX: Float
        var currentImageSize = 0
        when {
            cashCollapseState != null && cashCollapseState != this -> {
                when (first) {
                    TO_EXPANDED_STATE -> {
                        translationY = toolbar.height.toFloat()
                        headContainerHeight = appBarLayout.totalScrollRange.toFloat()
                        currentImageSize = EXPAND_AVATAR_SIZE.toInt()
                        /**/
                        titleToolbarText.visibility = View.VISIBLE
                        titleToolbarTextSingle.visibility = View.INVISIBLE
                        background.setBackgroundColor(ContextCompat.getColor(this@Demo2Activity, R.color.color_transparent))
                        /**/
                        ivAvatar.translationX = 0f
                    }

                    TO_COLLAPSED_STATE -> {
                        background.setBackgroundColor(ContextCompat.getColor(this@Demo2Activity, R.color.colorPrimary))
                        currentImageSize = COLLAPSE_IMAGE_SIZE.toInt()
                        translationY = appBarLayout.totalScrollRange.toFloat() - (toolbar.height - COLLAPSE_IMAGE_SIZE) / 2
                        headContainerHeight = toolbar.height.toFloat()
                        translationX = appBarLayout.width / 2f - COLLAPSE_IMAGE_SIZE / 2 - margin * 2
                        /**/
                        ValueAnimator.ofFloat(ivAvatar.translationX, translationX).apply {
                            addUpdateListener {
                                if (cashCollapseState!!.first == TO_COLLAPSED_STATE) {
                                    ivAvatar.translationX = it.animatedValue as Float
                                }
                            }
                            interpolator = AnticipateOvershootInterpolator()
                            startDelay = 69
                            duration = 350
                            start()
                        }
                       ...
                    }
                }

                ivAvatar.apply {
                    layoutParams.height = currentImageSize
                    layoutParams.width = currentImageSize
                }
                collapsingAvatarContainer.apply {
                    layoutParams.height = headContainerHeight.toInt()
                    this.translationY = translationY
                    requestLayout()
                }
                /**/
                cashCollapseState = Pair(first, SWITCHED)
            }

查看我的示例本机代码："Collapsing Avatar Toolbar Sample"

Answer 2

我认为使用 MotionLayout 可以轻松实现这些类型的动画。我已经使用 MotionLayout here 实现了示例折叠布局。您可以根据您的用例修改它。简单更改开始和结束约束。

折叠工具栏布局，工具栏中带有徽标、标题、副标题

Collapsing Toolbar layout with logo, title, subtitle in toolbar

android

android-layout

toolbar

material-design

android-collapsingtoolbarlayout

演示 1

演示 2