Android 如何在NestedScrollView中使用RecyclerView?
如何在Android 如何在NestedScrollView中使用RecyclerView?,android,android-recyclerview,Android,Android Recyclerview,如何在NestedScrollView内部使用RecyclerView? 设置适配器后,RecyclerView内容不可见 更新布局代码已更新 <android.support.v4.widget.NestedScrollView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"
NestedScrollView
内部使用RecyclerView
?
设置适配器后,RecyclerView
内容不可见
更新布局代码已更新
<android.support.v4.widget.NestedScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="@dimen/keyline_1">
</RelativeLayout>
<View
android:id="@+id/separator"
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="#e5e5e5" />
<android.support.v7.widget.RecyclerView
android:id="@+id/conversation"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
您可以使用android:fillViewport=“true”
制作NestedScrollView
测量RecyclerView
。RecyclerView
将填充剩余高度。因此,如果你想滚动nestcrollview
,你可以设置RecyclerView
的minHeight
,你可以使用android:fillViewport=“true”
使NestedScrollView
测量RecyclerView
。RecyclerView
将填充剩余高度。因此,如果要滚动嵌套滚动视图
,可以设置回收器视图
的最小高度
,不能在嵌套滚动视图中使用回收器视图。它并不打算包含更多的可滚动视图,但因为它是滚动布局本身的子级,所以您需要嵌套的滚动视图。我也遇到了同样的问题,但最后我将我的textview移动到了recyclerview中的headerview,使recyclerview成为coordinator布局的直接子视图,并删除了嵌套的滚动视图。然后我所有的问题都消失了。您不能在嵌套的滚动视图中使用回收器视图。它并不打算包含更多的可滚动视图,但因为它是滚动布局本身的子级,所以您需要嵌套的滚动视图。我也遇到了同样的问题,但最后我将我的textview移动到了recyclerview中的headerview,使recyclerview成为coordinator布局的直接子视图,并删除了嵌套的滚动视图。然后我所有的问题都消失了。用
<android.support.v7.widget.RecyclerView
android:id="@+id/conversation"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
我会处理剩下的事情
还有一件事,无需将您的recyclerView放入NestedScrollView中将您的recyclerView替换为
<android.support.v7.widget.RecyclerView
android:id="@+id/conversation"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
我会处理剩下的事情
还有一件事,无需将您的recyclerView放入NestedScrollView中更新1 自从Android支持库23.2.0以来,为LayoutManager添加了方法
setAutoMeasureEnabled(true)
。它使RecyclerView能够包装其内容,并像一个符咒一样工作。因此,只需添加如下内容:
LayoutManager layoutManager = new LinearLayoutManager(this);
layoutManager.setAutoMeasureEnabled(true);
recyclerView.setLayoutManager(layoutManager);
recyclerView.setNestedScrollingEnabled(false);
<android.support.v7.widget.RecyclerView
android:id="@+id/review_list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scrollbars="vertical" />
更新2 由于27.1.0
setAutoMeasureEnabled
已被弃用,因此您应该使用重写的方法isAutoMeasureEnabled()
但是在多次使用RecyclerView之后,我强烈建议不要在包装模式下使用它,因为这不是它的目的。尝试使用带有多个项目类型的普通single RecyclerView重构整个布局。或者使用我在下面描述的线性布局方法作为最后手段
旧答案(不推荐) 您可以在
NestedScrollView
内部使用RecyclerView
。
首先,您应该实现自己的自定义LinearLayoutManager
,它使您的RecyclerView
包装其内容。
例如:
public class WrappingLinearLayoutManager extends LinearLayoutManager
{
public WrappingLinearLayoutManager(Context context) {
super(context);
}
private int[] mMeasuredDimension = new int[2];
@Override
public boolean canScrollVertically() {
return false;
}
@Override
public void onMeasure(RecyclerView.Recycler recycler, RecyclerView.State state,
int widthSpec, int heightSpec) {
final int widthMode = View.MeasureSpec.getMode(widthSpec);
final int heightMode = View.MeasureSpec.getMode(heightSpec);
final int widthSize = View.MeasureSpec.getSize(widthSpec);
final int heightSize = View.MeasureSpec.getSize(heightSpec);
int width = 0;
int height = 0;
for (int i = 0; i < getItemCount(); i++) {
if (getOrientation() == HORIZONTAL) {
measureScrapChild(recycler, i,
View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED),
heightSpec,
mMeasuredDimension);
width = width + mMeasuredDimension[0];
if (i == 0) {
height = mMeasuredDimension[1];
}
} else {
measureScrapChild(recycler, i,
widthSpec,
View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED),
mMeasuredDimension);
height = height + mMeasuredDimension[1];
if (i == 0) {
width = mMeasuredDimension[0];
}
}
}
switch (widthMode) {
case View.MeasureSpec.EXACTLY:
width = widthSize;
case View.MeasureSpec.AT_MOST:
case View.MeasureSpec.UNSPECIFIED:
}
switch (heightMode) {
case View.MeasureSpec.EXACTLY:
height = heightSize;
case View.MeasureSpec.AT_MOST:
case View.MeasureSpec.UNSPECIFIED:
}
setMeasuredDimension(width, height);
}
private void measureScrapChild(RecyclerView.Recycler recycler, int position, int widthSpec,
int heightSpec, int[] measuredDimension) {
View view = recycler.getViewForPosition(position);
if (view.getVisibility() == View.GONE) {
measuredDimension[0] = 0;
measuredDimension[1] = 0;
return;
}
// For adding Item Decor Insets to view
super.measureChildWithMargins(view, 0, 0);
RecyclerView.LayoutParams p = (RecyclerView.LayoutParams) view.getLayoutParams();
int childWidthSpec = ViewGroup.getChildMeasureSpec(
widthSpec,
getPaddingLeft() + getPaddingRight() + getDecoratedLeft(view) + getDecoratedRight(view),
p.width);
int childHeightSpec = ViewGroup.getChildMeasureSpec(
heightSpec,
getPaddingTop() + getPaddingBottom() + getDecoratedTop(view) + getDecoratedBottom(view),
p.height);
view.measure(childWidthSpec, childHeightSpec);
// Get decorated measurements
measuredDimension[0] = getDecoratedMeasuredWidth(view) + p.leftMargin + p.rightMargin;
measuredDimension[1] = getDecoratedMeasuredHeight(view) + p.bottomMargin + p.topMargin;
recycler.recycleView(view);
}
}
但您也应该调用这两种方法:
recyclerView.setNestedScrollingEnabled(false);
recyclerView.setHasFixedSize(false);
此处setNestedScrollingEnabled(false)
为RecyclerView
禁用滚动,因此它不会从NestedScrollView
截取滚动事件。和setHasFixedSize(false)
确定适配器内容的更改可以更改RecyclerView的大小
recyclerView.setLayoutManager(new WrappingLinearLayoutManager(getContext()));
重要提示:此解决方案在某些情况下存在小错误,并且性能有问题,因此如果您的回收视图中有很多项,我建议使用基于自定义线性布局的列表视图实现,为其创建适配器的模拟,并使其行为类似于列表视图
或回收视图
更新1
recyclerView.setLayoutManager(new WrappingLinearLayoutManager(getContext()));
自从Android支持库23.2.0以来,为LayoutManager添加了方法setAutoMeasureEnabled(true)
。它使RecyclerView能够包装其内容,并像一个符咒一样工作。
因此,只需添加如下内容:
LayoutManager layoutManager = new LinearLayoutManager(this);
layoutManager.setAutoMeasureEnabled(true);
recyclerView.setLayoutManager(layoutManager);
recyclerView.setNestedScrollingEnabled(false);
<android.support.v7.widget.RecyclerView
android:id="@+id/review_list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scrollbars="vertical" />
更新2
由于27.1.0setAutoMeasureEnabled
已被弃用,因此您应该使用重写的方法isAutoMeasureEnabled()
但是在多次使用RecyclerView之后,我强烈建议不要在包装模式下使用它,因为这不是它的目的。尝试使用带有多个项目类型的普通single RecyclerView重构整个布局。或者使用我在下面描述的线性布局方法作为最后手段
旧答案(不推荐)
您可以在NestedScrollView
内部使用RecyclerView
。
首先,您应该实现自己的自定义LinearLayoutManager
,它使您的RecyclerView
包装其内容。
例如:
public class WrappingLinearLayoutManager extends LinearLayoutManager
{
public WrappingLinearLayoutManager(Context context) {
super(context);
}
private int[] mMeasuredDimension = new int[2];
@Override
public boolean canScrollVertically() {
return false;
}
@Override
public void onMeasure(RecyclerView.Recycler recycler, RecyclerView.State state,
int widthSpec, int heightSpec) {
final int widthMode = View.MeasureSpec.getMode(widthSpec);
final int heightMode = View.MeasureSpec.getMode(heightSpec);
final int widthSize = View.MeasureSpec.getSize(widthSpec);
final int heightSize = View.MeasureSpec.getSize(heightSpec);
int width = 0;
int height = 0;
for (int i = 0; i < getItemCount(); i++) {
if (getOrientation() == HORIZONTAL) {
measureScrapChild(recycler, i,
View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED),
heightSpec,
mMeasuredDimension);
width = width + mMeasuredDimension[0];
if (i == 0) {
height = mMeasuredDimension[1];
}
} else {
measureScrapChild(recycler, i,
widthSpec,
View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED),
mMeasuredDimension);
height = height + mMeasuredDimension[1];
if (i == 0) {
width = mMeasuredDimension[0];
}
}
}
switch (widthMode) {
case View.MeasureSpec.EXACTLY:
width = widthSize;
case View.MeasureSpec.AT_MOST:
case View.MeasureSpec.UNSPECIFIED:
}
switch (heightMode) {
case View.MeasureSpec.EXACTLY:
height = heightSize;
case View.MeasureSpec.AT_MOST:
case View.MeasureSpec.UNSPECIFIED:
}
setMeasuredDimension(width, height);
}
private void measureScrapChild(RecyclerView.Recycler recycler, int position, int widthSpec,
int heightSpec, int[] measuredDimension) {
View view = recycler.getViewForPosition(position);
if (view.getVisibility() == View.GONE) {
measuredDimension[0] = 0;
measuredDimension[1] = 0;
return;
}
// For adding Item Decor Insets to view
super.measureChildWithMargins(view, 0, 0);
RecyclerView.LayoutParams p = (RecyclerView.LayoutParams) view.getLayoutParams();
int childWidthSpec = ViewGroup.getChildMeasureSpec(
widthSpec,
getPaddingLeft() + getPaddingRight() + getDecoratedLeft(view) + getDecoratedRight(view),
p.width);
int childHeightSpec = ViewGroup.getChildMeasureSpec(
heightSpec,
getPaddingTop() + getPaddingBottom() + getDecoratedTop(view) + getDecoratedBottom(view),
p.height);
view.measure(childWidthSpec, childHeightSpec);
// Get decorated measurements
measuredDimension[0] = getDecoratedMeasuredWidth(view) + p.leftMargin + p.rightMargin;
measuredDimension[1] = getDecoratedMeasuredHeight(view) + p.bottomMargin + p.topMargin;
recycler.recycleView(view);
}
}
但您也应该调用这两种方法:
recyclerView.setNestedScrollingEnabled(false);
recyclerView.setHasFixedSize(false);
此处setNestedScrollingEnabled(false)
为RecyclerView
禁用滚动,因此它不会从NestedScrollView
截取滚动事件。和setHasFixedSize(false)
确定适配器内容的更改可以更改RecyclerView的大小
recyclerView.setLayoutManager(new WrappingLinearLayoutManager(getContext()));
重要提示:此解决方案在某些情况下存在小错误,并且性能有问题,因此如果您的回收视图中有很多项,我建议使用基于自定义线性布局的列表视图实现,为它创建适配器的模拟,并使其行为类似于列表视图
或回收视图
尝试使用此库-
recyclerView.setLayoutManager(new WrappingLinearLayoutManager(getContext()));
库的LayoutManager使RecyclerView包装其内容。在这种情况下,我们
<android.support.v7.widget.RecyclerView
android:id="@+id/rv"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior" />
mRecyclerView.setNestedScrollingEnabled(false);
<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerview"
android:nestedScrollingEnabled="false"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<!-- Scrolling Content -->
<androidx.core.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:isScrollContainer="true"
android:measureAllChildren="true"
app:layout_behavior="@string/appbar_scrolling_view_behavior">
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recyclerview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fastScrollEnabled="true"
android:scrollbarStyle="insideInset"
android:scrollbars="vertical"
android:splitMotionEvents="false"
android:verticalScrollbarPosition="right"/>
</androidx.core.widget.NestedScrollView>
recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrollStateChanged(@NonNull RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
......
}
});
nestedScrollView.setNestedScrollingEnabled(true);
mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
//...
}
});
<androidx.core.widget.NestedScrollView
android:id="@+id/nested"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true"
android:layout_below="@id/appBarLayout_orders"
app:layout_behavior="@string/appbar_scrolling_view_behavior">
<androidx.constraintlayout.widget.ConstraintLayout ...
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recycler"
android:layout_width="match_parent"
android:layout_height="0dp"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"/>
<com.your_package.utils.NestedRecyclerView
android:id="@+id/rv_test"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<androidx.core.widget.NestedScrollView
android:id="@+id/nestedScrollView"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:descendantFocusability="blocksDescendants">
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recyclerView"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:nestedScrollingEnabled="false" />
</LinearLayout>
</androidx.core.widget.NestedScrollView>