我在折叠工具栏的帮助下实现展开和折叠工具栏，但是当我的工具栏折叠时我卡住了，我想显示不同的工具栏。我看过这么一段代码，但无法找到我的解决方案。 我还看到了一位了不起的开发人员的解决方案 https://github.com/saulmm/CoordinatorLayoutExample但无法正确找到我的解决方案

这是我实现的一段代码

activity_collapsing_toolbar.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:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/app_bar_layout"
        android:layout_width="match_parent"
        android:layout_height="176dp"
        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"
            app:contentScrim="?attr/colorPrimary"
            app:layout_scrollFlags="scroll|exitUntilCollapsed">


            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_gravity="center"
                android:background="@color/base_color_theme_new"
                android:gravity="center_horizontal"
                app:layout_collapseMode="parallax">

                <RelativeLayout
                    android:id="@+id/rl_class_image"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginTop="26dp"
                    android:gravity="center">

                    <LinearLayout
                        android:id="@+id/ll_class"
                        android:layout_width="60dp"
                        android:layout_height="60dp"
                        android:background="@drawable/rounded_white_circle"
                        android:gravity="center">

                        <ImageView
                            android:id="@+id/iv_class_image"
                            android:layout_width="60dp"
                            android:layout_height="60dp"
                            android:layout_gravity="center"
                            android:padding="8dp"
                            android:src="@drawable/class_4" />
                    </LinearLayout>
                </RelativeLayout>


                <TextView
                    android:id="@+id/tv_class_name"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_below="@id/rl_class_image"
                    android:layout_marginTop="15dp"
                    android:gravity="center"
                    android:text="MATHEMATICS"
                    android:textSize="17sp" />

                <TextView
                    android:id="@+id/tv_videos_test"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_below="@id/tv_class_name"
                    android:layout_marginTop="10dp"
                    android:gravity="center"
                    android:text="20 VIDEOS | 5 TESTS"
                    android:textSize="10sp" />


            </RelativeLayout>

            <android.support.v7.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                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"
        android:layout_marginLeft="10dp"
        android:layout_marginRight="10dp"
        android:background="@drawable/rounded_corners_for_list"
        android:fillViewport="true"

        app:behavior_overlapTop="10dp"
        app:layout_behavior="@string/appbar_scrolling_view_behavior">


        <!--<include layout="@layout/activity_chapters" />-->
        <com.chalklit.widget.NonScrollListView
            android:id="@+id/lv_modules_list"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="@android:color/white"
            android:divider="@null"
            android:scrollbars="none"></com.chalklit.widget.NonScrollListView>


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

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

CollapsingToolbarActivity.java

private CollapsingToolbarLayout collapsingToolbarLayout = null;
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);


    setContentView(R.layout.activity_collapsing_toolbar);

    final Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    toolbar.inflateMenu(R.menu.menu_main);

    setSupportActionBar(toolbar);
    ActionBar actionBar = getSupportActionBar();
    actionBar.setDisplayHomeAsUpEnabled(true);

    collapsingToolbarLayout = (CollapsingToolbarLayout) findViewById(R.id.collapsing_toolbar);
    collapsingToolbarLayout.setTitle(" ");
    collapsingToolbarLayout.setContentScrimColor(getResources().getColor(R.color.base_color_theme_new));
    collapsingToolbarLayout.setStatusBarScrimColor(getResources().getColor(R.color.base_color_theme_new));
}

最佳答案

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

查看我的示例 native 代码:"Collapsing Avatar Toolbar Sample"

阅读我的 "Animation Collapsing Toolbar Android"在 Medium 上发帖。

演示 1 演示 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avatar改变了尺寸和改变了avatar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 更改、TO_COLLAPSED_STATE 更改、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 native 代码:"Collapsing Avatar Toolbar Sample"

关于android - 在 Android 中展开和折叠工具栏，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/41276361/