Android - 設計庫視差標題

Question

我無法想出一個XML布局來達到預期的效果。

1. 工具欄應始終保持固定在頂部。 （綠色矩形）
2. 當回滾視圖滾動時，視差區域（紅色矩形）應具有視差滾動效果（由紅色的向上/向下箭頭指示）。

這就是我當前的XML布局

<?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/appbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:fitsSystemWindows="true"
        android:orientation="vertical"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

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

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            app:layout_scrollFlags="scroll"
            app:layout_collapseMode="parallax">

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:padding="8dp"
                android:text="This is a test widget" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:padding="8dp"
                android:text="This is a test widget" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:padding="8dp"
                android:text="This is a test widget" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:padding="8dp"
                android:text="This is a test widget" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:padding="8dp"
                android:text="This is a test widget" />

        </LinearLayout>

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

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />

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

我的XML布局完全滾動內容並從窗口向外滾動並在返回時（向下滾動）它下拉大約56dp的appbarlayout值（我的工具欄的大小），然后在更多滾動之后剩下的就下來了。

如何實現1＆2？

-----編輯：我將我的XML布局修改為以下內容。 -----

<?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/appbar"
        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:id="@+id/collapsing_toolbar"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:fitsSystemWindows="true"
            app:contentScrim="?attr/colorPrimary"
            app:expandedTitleTextAppearance="@style/ExpandedAppBar"
            app:layout_scrollFlags="scroll|exitUntilCollapsed"
            app:titleEnabled="false">

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

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_marginTop="?attr/actionBarSize"
                android:orientation="vertical"
                app:layout_collapseMode="parallax">

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:padding="8dp"
                    android:text="This is a test widget" />

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:padding="8dp"
                    android:text="This is a test widget" />

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:padding="8dp"
                    android:text="This is a test widget" />

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:padding="8dp"
                    android:text="This is a test widget" />

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:padding="8dp"
                    android:text="This is a test widget" />

            </LinearLayout>

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

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

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />

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

它大部分都有效，但視差部分內的視圖覆蓋了工具欄。

----- EDIT2：這個XML布局有效！ 確保您的工具欄位於CollapsingToolbarLayout的底部，以便在其他視圖之上繪制！

<?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/appbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        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"
            android:background="@color/primary"
            app:expandedTitleTextAppearance="@style/ExpandedAppBar"
            app:layout_scrollFlags="scroll|exitUntilCollapsed"
            app:titleEnabled="false">

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="vertical"
                android:layout_marginTop="?attr/actionBarSize"
                app:layout_collapseMode="parallax">

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:padding="8dp"
                    android:text="This is a test widget" />

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:padding="8dp"
                    android:text="This is a test widget" />

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:padding="8dp"
                    android:text="This is a test widget" />

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:padding="8dp"
                    android:text="This is a test widget" />

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:padding="8dp"
                    android:text="This is a test widget" />

            </LinearLayout>

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

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

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

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />

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

Answer 1

這就是我設法讓它發揮作用的方式。

<android.support.design.widget.AppBarLayout
    android:id="@+id/appbar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    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"
        android:background="@color/primary"
        app:expandedTitleTextAppearance="@style/ExpandedAppBar"
        app:layout_scrollFlags="scroll|exitUntilCollapsed"
        app:titleEnabled="false">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical"
            android:layout_marginTop="?attr/actionBarSize"
            app:layout_collapseMode="parallax">

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:padding="8dp"
                android:text="This is a test widget" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:padding="8dp"
                android:text="This is a test widget" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:padding="8dp"
                android:text="This is a test widget" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:padding="8dp"
                android:text="This is a test widget" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:padding="8dp"
                android:text="This is a test widget" />

        </LinearLayout>

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

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

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

<android.support.v7.widget.RecyclerView
    android:id="@+id/recyclerView"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior" />

確保您的工具欄位於CollapsingToolbarLayout的底部，以便在其他視圖之上繪制！

Answer 2

我認為您想要實現的目標無法通過支持庫完成。
但您可以嘗試將此添加到您的適配器：

    private CustomRelativeWrapper mHeader;

    public void setParallaxHeader(View header, RecyclerView view) {
        Context context = header.getContext();
        mRecyclerView = view;
        mHeader = new CustomRelativeWrapper(context);
        mHeader.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
                ViewGroup.LayoutParams.WRAP_CONTENT));
        mHeader.addView(header, new RelativeLayout.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
        view.addOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
                super.onScrolled(recyclerView, dx, dy);
                if (mHeader != null) {
                    mTotalYScrolled += dy;
                    translateHeader(mTotalYScrolled);
                }
            }
        });
    }

翻譯標題是：

public void translateHeader(float of) {
    float ofCalculated = of * SCROLL_MULTIPLIER;
    final float left = Math
            .min(1, ((ofCalculated) / (mHeader.getHeight() * SCROLL_MULTIPLIER)));
    if (left < 0) {
        ofCalculated = 0;
    }
    mHeader.setTranslationY(ofCalculated);
    mHeader.setClipY(Math.round(ofCalculated));
    if (mParallaxScroll != null) {
        mParallaxScroll.onParallaxScroll(left, of, mHeader);
    }
}

和CustomRelativeWrapper：

static class CustomRelativeWrapper extends RelativeLayout {

    private int mOffset;
    private boolean mShouldClip;

    public CustomRelativeWrapper(Context context) {
        super(context);
    }

    @Override
    protected void dispatchDraw(Canvas canvas) {
        canvas.clipRect(new Rect(getLeft(), getTop(), getRight(), getBottom() + mOffset));
        super.dispatchDraw(canvas);
    }

    public void setClipY(int offset) {
        mOffset = offset;
        invalidate();
    }
}