我有一个NestedScrollView，其中RecyclerView和RelativeLayout位于其中..
基本上就是这样
<NestedScrollView>
<RelativeLayout> //To contain the stuffs inside
<RelativeLayout /> // Contains a `TextView` and a `ProgressBar`
<RecyclerView /> // The most important thing.. Maybe
</RelativeLayout>
</NestedScrollView>
我正在使用CustomLinearLayoutManager和recyclerView.setNestedScrollingEnabled(false);来同时滚动RelativeLayout和RecyclerView，否则只有RecyclerView会滚动，{ {1}}只会保持最佳状态。
每当RelativeLayout加载新数据时，它会冻结3-5秒，这对用户体验非常不利。这是我正在使用的RecyclerView ..
CustomLayoutManager我实际上只是从另一个SO答案中复制了public class CustomLayoutManager extends LinearLayoutManager {
public CustomLayoutManager(Context context) {
super(context);
}
public CustomLayoutManager(Context context, int orientation, boolean reverseLayout) {
super(context, orientation, reverseLayout);
}
public CustomLayoutManager(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}
private int[] mMeasuredDimension = new int[2];
/**
* Disable predictive animations. There is a bug in RecyclerView which causes views that
* are being reloaded to pull invalid ViewHolders from the internal recycler stack if the
* adapter size has decreased since the ViewHolder was recycled.
*/
@Override
public boolean supportsPredictiveItemAnimations() {
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(i, View.MeasureSpec.UNSPECIFIED),
heightSpec,
mMeasuredDimension);
width = width + mMeasuredDimension[0];
if (i == 0) {
height = mMeasuredDimension[1];
}
} else {
measureScrapChild(recycler, i,
widthSpec,
View.MeasureSpec.makeMeasureSpec(i, 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);
recycler.bindViewToPosition(view, position);
if (view != null) {
RecyclerView.LayoutParams p = (RecyclerView.LayoutParams) view.getLayoutParams();
int childWidthSpec = ViewGroup.getChildMeasureSpec(widthSpec,
getPaddingLeft() + getPaddingRight(), p.width);
int childHeightSpec = ViewGroup.getChildMeasureSpec(heightSpec,
getPaddingTop() + getPaddingBottom(), p.height);
view.measure(childWidthSpec, childHeightSpec);
measuredDimension[0] = view.getMeasuredWidth() + p.leftMargin + p.rightMargin;
measuredDimension[1] = view.getMeasuredHeight() + p.bottomMargin + p.topMargin;
recycler.recycleView(view);
}
}
}
，它可能是也可能不是问题。