使用官方支持库23.x. + bottomSheet(如google maps)向上滑动图像

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我想完成谷歌地图与支持库23.x. +并且没有任何第三个库的相同行为

注意:这不是一个重复的问题,因为:

1. 我想使用行为,支持库和没有任何第三方库(我在问题标题和上面的描述中添加了它)
   
2. 我想要你在下一个gif中看到的所有行为,其他问题是要求一两个行为并使用任何方式来实现它.
   
   

我已经有官方的bottomSheet工作(甚至在选项卡和视图寻呼机内).

令我发疯的是如何在使用官方bottomSheet向上滑动时实现BottomSheet的图像行为？.

我尝试使用像FAB这样的锚没有成功.
我读了一些关于使用滚动监听器的内容,但是ppl说它不像谷歌地图那样平滑和快速.

我的XML(我不认为它会有所帮助,但无论如何):

<?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"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".ui.MasterActivity">

    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/AppTheme.AppBarOverlay">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:popupTheme="@style/AppTheme.PopupOverlay"
            app:layout_scrollFlags="scroll|enterAlways|snap">

            <Button
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                style="?android:attr/borderlessButtonStyle"
                android:text="Departure"
                android:layout_gravity="center"
                android:id="@+id/buttonToolBar"
                />


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

        <android.support.design.widget.TabLayout
            android:id="@+id/tabs"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:tabBackground="@android:color/white"
            app:tabTextColor="@color/colorAccent"
            app:tabSelectedTextColor="@color/colorAccent"/>

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

    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />


    <android.support.v4.widget.NestedScrollView
        android:id="@+id/asdf"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        app:behavior_peekHeight="100dp"
        android:fitsSystemWindows="true"
            app:layout_behavior="android.support.design.widget.BottomSheetBehavior">

        <LinearLayout
            android:id="@+id/qwert"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical"
            android:paddingBottom="16dp"
            android:background="@android:color/white"
            android:padding="15dp">

            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="BOOTOMSHEET TITLE"
                    android:textAppearance="@style/TextAppearance.AppCompat.Title" />

            <Button
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="Button1"/>

            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="text 2"
                android:layout_margin="10dp"/>

            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="text 3"
                android:layout_margin="10dp"/>

            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="text 4"
                android:layout_margin="10dp"/>


            <FrameLayout
                android:layout_width="match_parent"
                android:layout_height="320dp"
                android:background="@color/colorAccent">

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center"
                    android:text="Your remaining content here"
                    android:textColor="@android:color/white" />

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


    <android.support.design.widget.FloatingActionButton
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        app:layout_anchor="@id/asdf"
        app:layout_anchorGravity="top|right|end"
        android:src="@drawable/abc_ic_search_api_mtrl_alpha_copy"
        android:layout_margin="@dimen/fab_margin"
        android:clickable="true"/>

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

Answer 1

如果你想使用支持库23.4.0实现它.+我会告诉你我是如何得到它以及它是如何工作的.

注意:我为我的英语道歉,我试着给出一个编程答案(只是简短并混合了有用的代码)但看起来还不够好......

到目前为止我可以看到活动/片段有以下行为:

1. 2个带有动画的工具栏,可响应底部的纸张移动.
2. 当FAB靠近"模态工具栏"(当您向上滑动时出现的那个)时隐藏的FAB.
3. 底部背后的背景图像与某种视差效果.
4. 工具栏中的标题(TextView),当底页到达时显示.
5. 通知satus栏可以将其背景变为透明或全彩.
6. 具有"锚"状态的自定义底部工作表行为.
   
   

注2:这个答案谈论6个不是1或2的事情,就像其他问题一样,你现在能看到它们的区别吗？

好的,现在让我们逐一检查一下:

工具栏
当您在谷歌地图中打开该视图时,您可以看到一个工具栏,您可以在其中搜索,这是我唯一没有做的就像谷歌地图一样,因为我想要更通用.无论如何,当你开始拖动BottomSheet时它就在ToolBar内部AppBarLayout并且它被隐藏了,当BottomSheet到达COLLAPSED状态时它再次出现.
要实现它,您需要:

• 创建Behavior并扩展它AppBarLayout.ScrollingViewBehavior
• 覆盖layoutDependsOn和onDependentViewChanged方法.这样做你将听取bottomSheet的动作.
• 创建一些方法来隐藏和取消隐藏带有动画的AppBarLayout/ToolBar.
  
  

这是我为第一个工具栏或ActionBar做的方式:

@Override
public boolean layoutDependsOn(CoordinatorLayout parent, View child, View dependency) {
    return dependency instanceof NestedScrollView;
}

@Override
public boolean onDependentViewChanged(CoordinatorLayout parent, View child,
                                      View dependency) {

    if (mChild == null) {
        initValues(child, dependency);
        return false;
    }

    float dVerticalScroll = dependency.getY() - mPreviousY;
    mPreviousY = dependency.getY();

    //going up
    if (dVerticalScroll <= 0 && !hidden) {
        dismissAppBar(child);
        return true;
    }

    return false;
}

private void initValues(final View child, View dependency) {

    mChild = child;
    mInitialY = child.getY();

    BottomSheetBehaviorGoogleMapsLike bottomSheetBehavior = BottomSheetBehaviorGoogleMapsLike.from(dependency);
    bottomSheetBehavior.addBottomSheetCallback(new BottomSheetBehaviorGoogleMapsLike.BottomSheetCallback() {
        @Override
        public void onStateChanged(@NonNull View bottomSheet, @BottomSheetBehaviorGoogleMapsLike.State int newState) {
            if (newState == BottomSheetBehaviorGoogleMapsLike.STATE_COLLAPSED ||
                    newState == BottomSheetBehaviorGoogleMapsLike.STATE_HIDDEN)
                showAppBar(child);
        }

        @Override
        public void onSlide(@NonNull View bottomSheet, float slideOffset) {

        }
    });
}

private void dismissAppBar(View child){
    hidden = true;
    AppBarLayout appBarLayout = (AppBarLayout)child;
    mToolbarAnimation = appBarLayout.animate().setDuration(mContext.getResources().getInteger(android.R.integer.config_shortAnimTime));
    mToolbarAnimation.y(-(mChild.getHeight()+25)).start();
}

private void showAppBar(View child) {
    hidden = false;
    AppBarLayout appBarLayout = (AppBarLayout)child;
    mToolbarAnimation = appBarLayout.animate().setDuration(mContext.getResources().getInteger(android.R.integer.config_mediumAnimTime));
    mToolbarAnimation.y(mInitialY).start();
}

如果需要,可以填写完整的文件

第二个工具栏或"模态"工具栏:
您必须覆盖相同的方法,但在这个方法中您必须注意更多行为:

• 用动画显示/隐藏ToolBar
• 改变statur酒吧颜色/背景
• 在ToolBar中显示/隐藏BottomSheet标题
• 关闭bottomSheet或将其发送到折叠状态

这个的代码有点广泛,所以我会让链接

FAB

这也是一种自定义行为,但是从中延伸出来FloatingActionButton.Behavior.在onDependentViewChanged你必须看到它到达"offSet"或你要隐藏它的位置时.在我的情况下,我想隐藏它靠近第二个工具栏,所以我挖掘FAB父(一个CoordiantorLayout)寻找包含ToolBar的AppBarLayout,然后我使用ToolBar位置,如OffSet:

@Override
public boolean onDependentViewChanged(CoordinatorLayout parent, FloatingActionButton child, View dependency) {

    if (offset == 0)
        setOffsetValue(parent);

    if (dependency.getY() <=0)
        return false;

    if (child.getY() <= (offset + child.getHeight()) && child.getVisibility() == View.VISIBLE)
        child.hide();
    else if (child.getY() > offset && child.getVisibility() != View.VISIBLE)
        child.show();

    return false;
}

完成自定义FAB行为链接

具有视差效果的BottomSheet背后的图像:
与其他人一样,它是一个自定义行为,这个中唯一的"复杂"的东西是将图像锚定到BottomSheet并避免像默认视差效果一样的图像崩溃的小算法:

@Override
public boolean onDependentViewChanged(CoordinatorLayout parent, View child,
                                      View dependency) {

    if (mYmultiplier == 0) {
        initValues(child, dependency);
        return true;
    }

    float dVerticalScroll = dependency.getY() - mPreviousY;
    mPreviousY = dependency.getY();

    //going up
    if (dVerticalScroll <= 0 && child.getY() <= 0) {
        child.setY(0);
        return true;
    }

    //going down
    if (dVerticalScroll >= 0 && dependency.getY() <= mImageHeight)
        return false;

    child.setY( (int)(child.getY() + (dVerticalScroll * mYmultiplier) ) );

    return true;
}

用于背景的完整文件具有视差效果的图像

现在结束:自定义底部表格行为
首先要完成3个步骤,您需要了解默认的BottomSheetBehavior有5种状态:STATE_DRAGGING, STATE_SETTLING, STATE_EXPANDED, STATE_COLLAPSED, STATE_HIDDEN对于Google地图行为,您需要在折叠和展开之间添加中间状态:STATE_ANCHOR_POINT.
我尝试扩展默认的bottomSheetBehavior没有成功,所以我只是复制粘贴所有代码并修改我需要的东西.
要实现我正在谈论的内容,请按照以下步骤操作:

1. 创建一个Java类并从中扩展它 CoordinatorLayout.Behavior<V>
2. 将粘贴代码从默认BottomSheetBehavior文件复制到新文件.

3. clampViewPositionVertical使用以下代码修改方法:
   

   @Override
   public int clampViewPositionVertical(View child, int top, int dy) {
       return constrain(top, mMinOffset, mHideable ? mParentHeight : mMaxOffset);
   }
   int constrain(int amount, int low, int high) {
       return amount < low ? low : (amount > high ? high : amount);
   }
   

4. 添加新状态

   public static final int STATE_ANCHOR_POINT = X;

5. 修改下一个方法:onLayoutChild,onStopNestedScroll,BottomSheetBehavior<V> from(V view)和setState(可选)

public boolean onLayoutChild(CoordinatorLayout parent, V child, int layoutDirection) {
    // First let the parent lay it out
    if (mState != STATE_DRAGGING && mState != STATE_SETTLING) {
        if (ViewCompat.getFitsSystemWindows(parent) &&
                !ViewCompat.getFitsSystemWindows(child)) {
            ViewCompat.setFitsSystemWindows(child, true);
        }
        parent.onLayoutChild(child, layoutDirection);
    }
    // Offset the bottom sheet
    mParentHeight = parent.getHeight();
    mMinOffset = Math.max(0, mParentHeight - child.getHeight());
    mMaxOffset = Math.max(mParentHeight - mPeekHeight, mMinOffset);

    //if (mState == STATE_EXPANDED) {
    //    ViewCompat.offsetTopAndBottom(child, mMinOffset);
    //} else if (mHideable && mState == STATE_HIDDEN...
    if (mState == STATE_ANCHOR_POINT) {
        ViewCompat.offsetTopAndBottom(child, mAnchorPoint);
    } else if (mState == STATE_EXPANDED) {
        ViewCompat.offsetTopAndBottom(child, mMinOffset);
    } else if (mHideable && mState == STATE_HIDDEN) {
        ViewCompat.offsetTopAndBottom(child, mParentHeight);
    } else if (mState == STATE_COLLAPSED) {
        ViewCompat.offsetTopAndBottom(child, mMaxOffset);
    }
    if (mViewDragHelper == null) {
        mViewDragHelper = ViewDragHelper.create(parent, mDragCallback);
    }
    mViewRef = new WeakReference<>(child);
    mNestedScrollingChildRef = new WeakReference<>(findScrollingChild(child));
    return true;
}


public void onStopNestedScroll(CoordinatorLayout coordinatorLayout, V child, View target) {
    if (child.getTop() == mMinOffset) {
        setStateInternal(STATE_EXPANDED);
        return;
    }
    if (target != mNestedScrollingChildRef.get() || !mNestedScrolled) {
        return;
    }
    int top;
    int targetState;
    if (mLastNestedScrollDy > 0) {
        //top = mMinOffset;
        //targetState = STATE_EXPANDED;
        int currentTop = child.getTop();
        if (currentTop > mAnchorPoint) {
            top = mAnchorPoint;
            targetState = STATE_ANCHOR_POINT;
        }
        else {
            top = mMinOffset;
            targetState = STATE_EXPANDED;
        }
    } else if (mHideable && shouldHide(child, getYVelocity())) {
        top = mParentHeight;
        targetState = STATE_HIDDEN;
    } else if (mLastNestedScrollDy == 0) {
        int currentTop = child.getTop();
        if (Math.abs(currentTop - mMinOffset) < Math.abs(currentTop - mMaxOffset)) {
            top = mMinOffset;
            targetState = STATE_EXPANDED;
        } else {
            top = mMaxOffset;
            targetState = STATE_COLLAPSED;
        }
    } else {
        //top = mMaxOffset;
        //targetState = STATE_COLLAPSED;
        int currentTop = child.getTop();
        if (currentTop > mAnchorPoint) {
            top = mMaxOffset;
            targetState = STATE_COLLAPSED;
        }
        else {
            top = mAnchorPoint;
            targetState = STATE_ANCHOR_POINT;
        }
    }
    if (mViewDragHelper.smoothSlideViewTo(child, child.getLeft(), top)) {
        setStateInternal(STATE_SETTLING);
        ViewCompat.postOnAnimation(child, new SettleRunnable(child, targetState));
    } else {
        setStateInternal(targetState);
    }
    mNestedScrolled = false;
}

public final void setState(@State int state) {
    if (state == mState) {
        return;
    }
    if (mViewRef == null) {
        // The view is not laid out yet; modify mState and let onLayoutChild handle it later
        /**
         * New behavior (added: state == STATE_ANCHOR_POINT ||)
         */
        if (state == STATE_COLLAPSED || state == STATE_EXPANDED ||
                state == STATE_ANCHOR_POINT ||
                (mHideable && state == STATE_HIDDEN)) {
            mState = state;
        }
        return;
    }
    V child = mViewRef.get();
    if (child == null) {
        return;
    }
    int top;
    if (state == STATE_COLLAPSED) {
        top = mMaxOffset;
    } else if (state == STATE_ANCHOR_POINT) {
        top = mAnchorPoint;
    } else if (state == STATE_EXPANDED) {
        top = mMinOffset;
    } else if (mHideable && state == STATE_HIDDEN) {
        top = mParentHeight;
    } else {
        throw new IllegalArgumentException("Illegal state argument: " + state);
    }
    setStateInternal(STATE_SETTLING);
    if (mViewDragHelper.smoothSlideViewTo(child, child.getLeft(), top)) {
        ViewCompat.postOnAnimation(child, new SettleRunnable(child, state));
    }
}


public static <V extends View> BottomSheetBehaviorGoogleMapsLike<V> from(V view) {
    ViewGroup.LayoutParams params = view.getLayoutParams();
    if (!(params instanceof CoordinatorLayout.LayoutParams)) {
        throw new IllegalArgumentException("The view is not a child of CoordinatorLayout");
    }
    CoordinatorLayout.Behavior behavior = ((CoordinatorLayout.LayoutParams) params)
            .getBehavior();
    if (!(behavior instanceof BottomSheetBehaviorGoogleMapsLike)) {
        throw new IllegalArgumentException(
                "The view is not associated with BottomSheetBehaviorGoogleMapsLike");
    }
    return (BottomSheetBehaviorGoogleMapsLike<V>) behavior;
}

链接到洞项目,您可以在其中查看所有自定义行为

注3:下次添加评论,以礼貌的方式询问答案的变化,或者问为什么这个答案比其他人在关闭相同主题之前回答的东西等于其他答案,或者标记为重复.

以下是它的外观:
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