<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:clipToPadding="false">

<android.support.design.widget.AppBarLayout
    android:id="@+id/app_bar_layout"
    android:layout_width="match_parent"
    android:layout_height="210dp"
    android:stateListAnimator="@animator/appbar_always_elevated" //I put this here because I want to have shadow when is open, but you have to create the xml file.
    android:background="@color/WHITE">

    <android.support.design.widget.CollapsingToolbarLayout
        android:id="@+id/collapsing_toolbar_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:collapsedTitleTextAppearance="@style/TextAppearance.AppCompat.Widget.ActionBar.Title.Inverse"
        app:expandedTitleMarginStart="72dp"
        app:expandedTitleTextAppearance="@style/TextAppearance.AppCompat.Widget.ActionBar.Title.Inverse"
        app:layout_scrollFlags="scroll|exitUntilCollapsed"> //HERE you should take a look what you want your collapse bar do.

        <Here you put the content for you collapse bar, like a ImageView>

        <android.support.v7.widget.Toolbar //This is the size of your fixed bar when you collapse, even here you can put a back button, for example
            android:id="@+id/app_bar"
            android:layout_width="match_parent"
            android:layout_height="40dp"
            app:layout_collapseMode="pin" />
    </android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>

<android.support.v4.widget.SwipeRefreshLayout
    android:id="@+id/main_home_list_swipe"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior" >

    <android.support.v7.widget.RecyclerView
        android:id="@+id/main_home_list"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

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

Obs:如果你放在一个xml文件上，注释将会给出错误。正在求婚，所以你会记得读哈哈哈

票数 6

Stack Overflow用户

发布于 2018-01-10 13:39:38

试试这个：-我也想在自定义视图上使用这种动画，我已经用这种方式实现了。

public class TestActivity extends AppCompatActivity {
    private static final int HIDE_THRESHOLD = 20;
    //this is you custom layout it is any thing.
    LinearLayout customLayout;
    private int scrolledDistance = 0;
    private boolean controlsVisible = true;
    private RecyclerView recyclerView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.your_layout);

        recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
        recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
                super.onScrollStateChanged(recyclerView, newState);
            }

            @Override
            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
                super.onScrolled(recyclerView, dx, dy);
                scrolledDistance = dy;
                if (scrolledDistance > HIDE_THRESHOLD && controlsVisible) {
                    hideViews();
                    controlsVisible = false;
                } else if (scrolledDistance < -HIDE_THRESHOLD && !controlsVisible) {
                    showViews();
                    controlsVisible = true;
                }
            }
        });
    }

    private void hideViews() {
        customLayout.animate().translationY(-customLayout.getHeight()).setInterpolator(new AccelerateInterpolator(2));
    }

    private void showViews() {
        customLayout.animate().translationY(0).setInterpolator(new DecelerateInterpolator(2));
    }
}

编辑-1\f25-1\f6 ScrollView -1\f6尝试此监听程序

scrollView.getViewTreeObserver().addOnScrollChangedListener(new ViewTreeObserver.OnScrollChangedListener() {
            @Override
            public void onScrollChanged() {
                if (scrolledDistance > HIDE_THRESHOLD && controlsVisible) {
                    hideViews();
                    controlsVisible = false;
                    scrolledDistance = 0;
                } else if (scrolledDistance < -HIDE_THRESHOLD && !controlsVisible) {
                    showViews();
                    controlsVisible = true;
                    scrolledDistance = 0;
                }
            }
        });

希望这对你也有帮助。

票数 5

Stack Overflow用户

发布于 2018-01-08 21:20:44

要实现工具栏的平滑展开和折叠，您可以应用平移动画或将CoordinatorLayout与AppBarLayout和Toolbar一起使用。

动画:首先，你必须在你的RecyclerView上检测向上和向下滚动。为此，您可以在RecyclerView上设置“setOnScrollListener”。一旦你有了向上滚动和向下滚动，只需应用动画。

代码：

rvHomeList.setOnScrollListener(new RecyclerView.OnScrollListener() {

            int verticalOffset;

            boolean scrollingUp;

            @Override
            public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
                if (newState == RecyclerView.SCROLL_STATE_IDLE) {
                    if (scrollingUp) {
                        Log.e("onScrollStateChanged", "UP");
                        if (verticalOffset > llTop.getHeight()) {
                            toolbarAnimateHide();
                        }
                    } else {
                        Log.e("onScrollStateChanged", "down");
                        if (llTop.getTranslationY() < llTop.getHeight() * -0.6 && verticalOffset > llTop.getHeight()) {
                            toolbarAnimateHide();
                        } else {
                            toolbarAnimateShow(verticalOffset);
                        }
                    }
                }
            }

            @Override
            public final void onScrolled(RecyclerView recyclerView, int dx, int dy) {
                verticalOffset += dy;
                scrollingUp = dy > 0;
                int toolbarYOffset = (int) (dy - llTop.getTranslationY());
                llTop.animate().cancel();
                if (scrollingUp) {
                    Log.e("onScrolled", "UP");
                    if (toolbarYOffset < llTop.getHeight()) {
                        llTop.setTranslationY(-toolbarYOffset);
                    } else {
                        llTop.setTranslationY(-llTop.getHeight());
                    }
                } else {
                    Log.e("onScrolled", "down");
                    if (toolbarYOffset < 0) {
                        llTop.setTranslationY(0);
                    } else {
                        llTop.setTranslationY(-toolbarYOffset);
                    }
                }
            }
        });

动画方法：

private void toolbarAnimateShow(final int verticalOffset) {
        if (!isShowing) {
            isShowing = true;
            llTop.animate()
                    .translationY(0)
                    .setInterpolator(new LinearInterpolator())
                    .setDuration(180)
                    .setListener(new AnimatorListenerAdapter() {
                        @Override
                        public void onAnimationStart(Animator animation) {
                            llTop.setVisibility(View.VISIBLE);
                            isShowing = false;
                        }
                    });
        }
    }

    private void toolbarAnimateHide() {
        if (!isHidding) {
            isHidding = true;
            llTop.animate()
                    .translationY(-llTop.getHeight())
                    .setInterpolator(new LinearInterpolator())
                    .setDuration(180)
                    .setListener(new AnimatorListenerAdapter() {
                        @Override
                        public void onAnimationEnd(Animator animation) {
                            llTop.setVisibility(View.GONE);
                            isHidding = false;
                        }
                    });
        }
    }

带有AppBarLayout和工具栏的滚动标志:通过将coordinatorLayout与appBarLayout和工具栏一起使用来进行，并设定在属性编辑器( attribute app:layout_scrollFlags )中使用的滚动标志，以实现滚动效果。必须启用它才能使任何滚动效果生效。此标志必须与enterAlways、enterAlwaysCollapsed、exitUntilCollapsed或snap一起启用。

enterAlways:向上滚动时，视图将变为可见。当从列表底部滚动并希望在向上滚动时立即显示工具栏时，此标志非常有用。当仅使用enterAlways时，工具栏将在您声明滚动down.Assuming enterAlways时继续扩展，并且您已经指定了minHeight，您也可以指定enterAlwaysCollapsed。使用此设置时，视图将仅以此最小高度显示。只有当滚动到顶部时，视图才会展开到完整的height
exitUntilCollapsed:。当设置了滚动标志时，向下滚动通常会导致整个内容显示为指定的minHeight和exitUntilCollapsed，工具栏的最小高度将在其余内容开始滚动之前达到，并从screen
snap:中退出。使用此选项将确定当视图仅部分缩小时该如何操作。如果滚动结束并且视图大小已减小到其原始大小的50%以下，则此视图将返回其原始大小。如果大小大于其大小的50%，它将完全消失。

代码：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/llBase"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/white"
    android:orientation="vertical">

    <android.support.design.widget.CoordinatorLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1">

        <android.support.design.widget.AppBarLayout
            android:id="@+id/appbarContainer"
            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/toolbar"
                android:layout_width="match_parent"
                android:layout_height="@dimen/_40sdp"
                android:gravity="center"
                android:theme="@style/ThemeOverlay.AppCompat.Light"
                app:layout_scrollFlags="scroll|enterAlways">

                <include
                    layout="@layout/top_bar"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content" />
            </android.support.v7.widget.Toolbar>
        </android.support.design.widget.AppBarLayout>

        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            app:layout_behavior="@string/appbar_scrolling_view_behavior">

            <RelativeLayout
                android:id="@+id/rlMain"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1"/>

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

</LinearLayout>

票数 2

页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持

原文链接：

https://stackoverflow.com/questions/39983970

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