HideBottomViewOnScrollBehavior 不适用于 recyclerview 项目 expand/collapse
HideBottomViewOnScrollBehavior not working on recyclerview item expand/collapse
我试图在向下滚动时隐藏文本视图并在向上滚动时显示它在我有 10 或 15 之类的项目时工作正常但如果我有较少的项目则工作不一样
在 recyclerview 中，我有 expanded/collapse 功能，所以有时不一样
textview 不是 hiding/visible 有时我不明白我将这一行添加到我想要 hide/show 滚动
的视图中
app:layout_behavior="com.google.android.material.behavior.HideBottomViewOnScrollBehavior"
XML
<androidx.coordinatorlayout.widget.CoordinatorLayout
android:id="@+id/lnMain"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@mipmap/bg"
tools:context=".tab.history.view.HistoryFragment">
<com.google.android.material.appbar.AppBarLayout
android:id="@+id/mAppBarLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:elevation="0dp">
<RelativeLayout
android:id="@+id/lnActionBar"
android:layout_width="match_parent"
android:layout_height="?android:attr/actionBarSize"
android:background="@color/colorPrimary">
<TextView
android:id="@+id/tvtitle"
style="@style/fontMedium"
android:layout_width="wrap_content"
android:layout_height="?android:attr/actionBarSize"
android:layout_centerHorizontal="true"
android:gravity="center_vertical"
android:text="@string/beacon"
android:textColor="@color/white"
android:textSize="@dimen/header_font_size" />
</RelativeLayout>
</com.google.android.material.appbar.AppBarLayout>
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/rvBeacon"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clipToPadding="false"
android:overScrollMode="never"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
android:paddingBottom="@dimen/_40sdp"
android:scrollbars="none"
android:visibility="visible"
app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
tools:itemCount="10"
tools:listitem="@layout/raw_beacon" />
<TextView
android:id="@+id/btnBack"
style="@style/fontBold"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="@dimen/_10sdp"
android:layout_marginBottom="@dimen/_20sdp"
android:background="@drawable/background_button_yellow_20dp"
android:contentDescription="@string/back_button"
android:drawableStart="@drawable/ic_back"
android:layout_gravity="bottom|center_horizontal"
android:drawablePadding="@dimen/_5sdp"
android:gravity="center"
android:padding="@dimen/_10sdp"
android:text="@string/back_to_search"
android:textColor="@color/white"
android:textSize="@dimen/button_font_size"
android:visibility="@{!isScanning ? View.VISIBLE: View.GONE}"
app:layout_behavior="com.google.android.material.behavior.HideBottomViewOnScrollBehavior" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>
这是我目前所做的，但并非每次都有效
注意：- 请注意，我有一个 recyclerview 项目可以扩展 onclick，因此滚动和文本视图必须根据
非常感谢任何帮助
自定义行为如何？
例如。
public class QuickReturnFooterBehavior extends CoordinatorLayout.Behavior<View> {
private static final Interpolator INTERPOLATOR = new FastOutSlowInInterpolator();
private static final long ANIMATION_DURATION = 200;
private int dyDirectionSum;
private boolean isShowing;
private boolean isHiding;
private boolean isNeedOption = true;
public boolean isNeedOption() {
return isNeedOption;
}
public void setNeedOption(boolean needOption) {
isNeedOption = needOption;
}
public QuickReturnFooterBehavior(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
public boolean onStartNestedScroll(@NonNull CoordinatorLayout coordinatorLayout, @NonNull View child, @NonNull View directTargetChild, @NonNull View target, int axes, int type) {
return axes == ViewCompat.SCROLL_AXIS_VERTICAL;
}
@Override
public void onNestedPreScroll(@NonNull CoordinatorLayout coordinatorLayout, @NonNull View child, @NonNull View target, int dx, int dy, @NonNull int[] consumed, int type) {
// scroll chhange up and down
if (isNeedOption) {
showView(child);
} else {
if (dy > 0 && dyDirectionSum < 0
|| dy < 0 && dyDirectionSum > 0) {
child.animate().cancel();
dyDirectionSum = 0;
}
dyDirectionSum += dy;
if (dyDirectionSum > child.getHeight()) {
hideView(child);
} else if (dyDirectionSum < -child.getHeight()) {
showView(child);
}
}
}
private void hideView(final View view) {
if (isHiding || view.getVisibility() != View.VISIBLE) {
return;
}
ViewPropertyAnimator animator = view.animate()
.translationY(view.getHeight())
.setInterpolator(INTERPOLATOR)
.setDuration(ANIMATION_DURATION);
animator.setListener(new Animator.AnimatorListener() {
@Override
public void onAnimationStart(Animator animator) {
isHiding = true;
}
@Override
public void onAnimationEnd(Animator animator) {
isHiding = false;
view.setVisibility(View.INVISIBLE);
}
@Override
public void onAnimationCancel(Animator animator) {
// show when cancle
isHiding = false;
showView(view);
}
@Override
public void onAnimationRepeat(Animator animator) {
// no-op
}
});
animator.start();
}
private void showView(final View view) {
if (isShowing || view.getVisibility() == View.VISIBLE) {
return;
}
ViewPropertyAnimator animator = view.animate()
.translationY(0)
.setInterpolator(INTERPOLATOR)
.setDuration(ANIMATION_DURATION);
animator.setListener(new Animator.AnimatorListener() {
@Override
public void onAnimationStart(Animator animator) {
isShowing = true;
view.setVisibility(View.VISIBLE);
}
@Override
public void onAnimationEnd(Animator animator) {
isShowing = false;
}
@Override
public void onAnimationCancel(Animator animator) {
// show when cancle
isShowing = false;
hideView(view);
}
@Override
public void onAnimationRepeat(Animator animator) {
// no-op
}
});
animator.start();
}
}
更新：检查可以在行为中滚动
child.canScrollVertically(1) // "Top of list"
child.canScrollVertically(-1) // "End of list"
**更新：添加 setter 和 getter **
private boolean isNeedOption = true;
我不知道为什么 HideBottomViewOnScrollBehavior 对你不起作用
app:layout_behavior="com.google.android.material.behavior.HideBottomViewOnScrollBehavior"
可能是因为你有一个 expand/collapse 功能，因为你只有 recyclerview only in screen 所以你也可以通过添加 Custom ScrollListener
来执行这个任务
MyRecyclerScroll class
public abstract class MyRecyclerScroll extends RecyclerView.OnScrollListener {
private static final float HIDE_THRESHOLD = 100;
private static final float SHOW_THRESHOLD = 50;
int scrollDist = 0;
private boolean isVisible = true;
// We dont use this method because its action is called per pixel value change
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
// Check scrolled distance against the minimum
if (isVisible && scrollDist > HIDE_THRESHOLD) {
// Hide fab & reset scrollDist
hide();
scrollDist = 0;
isVisible = false;
}
// -MINIMUM because scrolling up gives - dy values
else if (!isVisible && scrollDist < -SHOW_THRESHOLD) {
// Show fab & reset scrollDist
show();
scrollDist = 0;
isVisible = true;
}
// Whether we scroll up or down, calculate scroll distance
if ((isVisible && dy > 0) || (!isVisible && dy < 0)) {
scrollDist += dy;
}
}
public abstract void show();
public abstract void hide();
}
Activity/Fragment
binding.rvBeacon.addOnScrollListener(object : MyRecyclerScroll() {
override fun show() {
binding.btnBack.animate().translationY(0f).setInterpolator(DecelerateInterpolator(2f)).start()
}
override fun hide() {
binding.btnBack.animate().translationY(binding.btnBack.getHeight() + 60f)
.setInterpolator(AccelerateInterpolator(2f)).start()
}
})
您可以根据需要更改动画、延迟和边距
有关详细信息，请参阅此 blog
注意：如果你的recyclerview在scrollview里面，它将不起作用
我试图在向下滚动时隐藏文本视图并在向上滚动时显示它在我有 10 或 15 之类的项目时工作正常但如果我有较少的项目则工作不一样
在 recyclerview 中，我有 expanded/collapse 功能，所以有时不一样
textview 不是 hiding/visible 有时我不明白我将这一行添加到我想要 hide/show 滚动
app:layout_behavior="com.google.android.material.behavior.HideBottomViewOnScrollBehavior"
XML
<androidx.coordinatorlayout.widget.CoordinatorLayout
android:id="@+id/lnMain"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@mipmap/bg"
tools:context=".tab.history.view.HistoryFragment">
<com.google.android.material.appbar.AppBarLayout
android:id="@+id/mAppBarLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:elevation="0dp">
<RelativeLayout
android:id="@+id/lnActionBar"
android:layout_width="match_parent"
android:layout_height="?android:attr/actionBarSize"
android:background="@color/colorPrimary">
<TextView
android:id="@+id/tvtitle"
style="@style/fontMedium"
android:layout_width="wrap_content"
android:layout_height="?android:attr/actionBarSize"
android:layout_centerHorizontal="true"
android:gravity="center_vertical"
android:text="@string/beacon"
android:textColor="@color/white"
android:textSize="@dimen/header_font_size" />
</RelativeLayout>
</com.google.android.material.appbar.AppBarLayout>
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/rvBeacon"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clipToPadding="false"
android:overScrollMode="never"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
android:paddingBottom="@dimen/_40sdp"
android:scrollbars="none"
android:visibility="visible"
app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
tools:itemCount="10"
tools:listitem="@layout/raw_beacon" />
<TextView
android:id="@+id/btnBack"
style="@style/fontBold"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="@dimen/_10sdp"
android:layout_marginBottom="@dimen/_20sdp"
android:background="@drawable/background_button_yellow_20dp"
android:contentDescription="@string/back_button"
android:drawableStart="@drawable/ic_back"
android:layout_gravity="bottom|center_horizontal"
android:drawablePadding="@dimen/_5sdp"
android:gravity="center"
android:padding="@dimen/_10sdp"
android:text="@string/back_to_search"
android:textColor="@color/white"
android:textSize="@dimen/button_font_size"
android:visibility="@{!isScanning ? View.VISIBLE: View.GONE}"
app:layout_behavior="com.google.android.material.behavior.HideBottomViewOnScrollBehavior" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>
这是我目前所做的，但并非每次都有效
注意：- 请注意，我有一个 recyclerview 项目可以扩展 onclick，因此滚动和文本视图必须根据
非常感谢任何帮助
自定义行为如何？
例如。
public class QuickReturnFooterBehavior extends CoordinatorLayout.Behavior<View> {
private static final Interpolator INTERPOLATOR = new FastOutSlowInInterpolator();
private static final long ANIMATION_DURATION = 200;
private int dyDirectionSum;
private boolean isShowing;
private boolean isHiding;
private boolean isNeedOption = true;
public boolean isNeedOption() {
return isNeedOption;
}
public void setNeedOption(boolean needOption) {
isNeedOption = needOption;
}
public QuickReturnFooterBehavior(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
public boolean onStartNestedScroll(@NonNull CoordinatorLayout coordinatorLayout, @NonNull View child, @NonNull View directTargetChild, @NonNull View target, int axes, int type) {
return axes == ViewCompat.SCROLL_AXIS_VERTICAL;
}
@Override
public void onNestedPreScroll(@NonNull CoordinatorLayout coordinatorLayout, @NonNull View child, @NonNull View target, int dx, int dy, @NonNull int[] consumed, int type) {
// scroll chhange up and down
if (isNeedOption) {
showView(child);
} else {
if (dy > 0 && dyDirectionSum < 0
|| dy < 0 && dyDirectionSum > 0) {
child.animate().cancel();
dyDirectionSum = 0;
}
dyDirectionSum += dy;
if (dyDirectionSum > child.getHeight()) {
hideView(child);
} else if (dyDirectionSum < -child.getHeight()) {
showView(child);
}
}
}
private void hideView(final View view) {
if (isHiding || view.getVisibility() != View.VISIBLE) {
return;
}
ViewPropertyAnimator animator = view.animate()
.translationY(view.getHeight())
.setInterpolator(INTERPOLATOR)
.setDuration(ANIMATION_DURATION);
animator.setListener(new Animator.AnimatorListener() {
@Override
public void onAnimationStart(Animator animator) {
isHiding = true;
}
@Override
public void onAnimationEnd(Animator animator) {
isHiding = false;
view.setVisibility(View.INVISIBLE);
}
@Override
public void onAnimationCancel(Animator animator) {
// show when cancle
isHiding = false;
showView(view);
}
@Override
public void onAnimationRepeat(Animator animator) {
// no-op
}
});
animator.start();
}
private void showView(final View view) {
if (isShowing || view.getVisibility() == View.VISIBLE) {
return;
}
ViewPropertyAnimator animator = view.animate()
.translationY(0)
.setInterpolator(INTERPOLATOR)
.setDuration(ANIMATION_DURATION);
animator.setListener(new Animator.AnimatorListener() {
@Override
public void onAnimationStart(Animator animator) {
isShowing = true;
view.setVisibility(View.VISIBLE);
}
@Override
public void onAnimationEnd(Animator animator) {
isShowing = false;
}
@Override
public void onAnimationCancel(Animator animator) {
// show when cancle
isShowing = false;
hideView(view);
}
@Override
public void onAnimationRepeat(Animator animator) {
// no-op
}
});
animator.start();
}
}
更新：检查可以在行为中滚动
child.canScrollVertically(1) // "Top of list"
child.canScrollVertically(-1) // "End of list"
**更新：添加 setter 和 getter **
private boolean isNeedOption = true;
我不知道为什么 HideBottomViewOnScrollBehavior 对你不起作用
app:layout_behavior="com.google.android.material.behavior.HideBottomViewOnScrollBehavior"
可能是因为你有一个 expand/collapse 功能，因为你只有 recyclerview only in screen 所以你也可以通过添加 Custom ScrollListener
来执行这个任务MyRecyclerScroll class
public abstract class MyRecyclerScroll extends RecyclerView.OnScrollListener {
private static final float HIDE_THRESHOLD = 100;
private static final float SHOW_THRESHOLD = 50;
int scrollDist = 0;
private boolean isVisible = true;
// We dont use this method because its action is called per pixel value change
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
// Check scrolled distance against the minimum
if (isVisible && scrollDist > HIDE_THRESHOLD) {
// Hide fab & reset scrollDist
hide();
scrollDist = 0;
isVisible = false;
}
// -MINIMUM because scrolling up gives - dy values
else if (!isVisible && scrollDist < -SHOW_THRESHOLD) {
// Show fab & reset scrollDist
show();
scrollDist = 0;
isVisible = true;
}
// Whether we scroll up or down, calculate scroll distance
if ((isVisible && dy > 0) || (!isVisible && dy < 0)) {
scrollDist += dy;
}
}
public abstract void show();
public abstract void hide();
}
Activity/Fragment
binding.rvBeacon.addOnScrollListener(object : MyRecyclerScroll() {
override fun show() {
binding.btnBack.animate().translationY(0f).setInterpolator(DecelerateInterpolator(2f)).start()
}
override fun hide() {
binding.btnBack.animate().translationY(binding.btnBack.getHeight() + 60f)
.setInterpolator(AccelerateInterpolator(2f)).start()
}
})
您可以根据需要更改动画、延迟和边距
有关详细信息，请参阅此 blog
注意：如果你的recyclerview在scrollview里面，它将不起作用