Question

First Image Second image Third image

我想这样做但是使用折叠工具栏布局或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

您还可以查看带有动画头像和动画文本的示例

CollapsingAvatarToolbarSample

阅读我的post on Medium

所以让我解释一下它是如何工作的。我创建了实现自定义视图的 AppBarLayout.OnOffsetChangedListener 。在HeadCollapsing自定义视图内部，我在AppBarLayout中创建了文本和图像视图。

class HeadCollapsing(context: Context, attrs: AttributeSet?) : 
 FrameLayout(context, attrs), AppBarLayout.OnOffsetChangedListener {

  private fun findViews() {
            appBarLayout = findParentAppBarLayout()

            avatarContainerView = findViewById(R.id.imgb_avatar_wrap)

            titleToolbarText =  findViewById<AppCompatTextView>(id)

        }

  private fun findParentAppBarLayout(): AppBarLayout {
    val parent = this.parent
    return parent as? AppBarLayout ?: if (parent.parent is AppBarLayout) {
        parent.parent as AppBarLayout
    } else {
        throw IllegalStateException("Must be inside an AppBarLayout")
    }
}

  ...

     override fun onOffsetChanged(appBarLayout: AppBarLayout, offset:Int) {
           ...
           //Calculate expanded percentage
           val expandedPercentage = 1 - -offset / maxOffset
           updateViews(expandedPercentage)
     }
}

然后通过计算的百分比更改视图。例如文字视图改变：

         when {
                inversePercentage < ABROAD -> {
                    titleToolbarText?.visibility = View.VISIBLE
                    titleTolbarTextSingle?.visibility = View.INVISIBLE
                }

                inversePercentage > ABROAD -> {
                    titleToolbarText?.visibility = View.INVISIBLE
                    titleTolbarTextSingle?.visibility = View.VISIBLE
                    titleTolbarTextSingle?.let {
                        animateShowText(it)
                    }
                }
            }

检测何时需要图像折叠以动画方式创建对对象

private var cashCollapseState: kotlin.Pair<Int, Int>? = null

状态：TO_EXPANDED_STATE，TO_COLLAPSED_STATE，WAIT_FOR_SWITCH，SWITCHED

  companion object {
        const val ABROAD = 0.95f
        const val TO_EXPANDED_STATE = 0
        const val TO_COLLAPSED_STATE = 1
        const val WAIT_FOR_SWITCH = 0
        const val SWITCHED = 1
    }

然后为头像切换状态的渐进式动画：

 when {
                cashCollapseState != null && cashCollapseState != state -> {
                    when (state.first) {
                        TO_EXPANDED_STATE -> {
                          // do calculates
                        }
                        TO_COLLAPSED_STATE -> {

                    ValueAnimator.ofFloat(avatarContainerView.translationX, translationX).apply {
                        addUpdateListener {
                            avatarContainerView.translationX = it.animatedValue as Float
                        }

                        duration = 350
                        (state.first == TO_COLLAPSED_STATE).apply {
                            if (this) interpolator = LinearInterpolator()
                        }
                        start()
                    }
                //SWITCH STATE CASE
                cashCollapseState = kotlin.Pair(state.first, SWITCHED)
            }

            else -> {
                cashCollapseState = kotlin.Pair(state.first, WAIT_FOR_SWITCH)
            }

Answer 2

<强>平滑应用内杆布局

请参阅Example

<强>安装

compile "me.henrytao:smooth-app-bar-layout:<latest-version>"

Answer 3

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。您可以针对您的用例进行修改。只需更改开始和结束约束。

折叠工具栏布局，工具栏中包含徽标，标题，副标题

3 个答案: