使用LinearLayoutManager滚动到RecyclerView的顶部 [英] Scroll to top in RecyclerView with LinearLayoutManager
问题描述
我有一个片段,其中有RecyclerView
和LinearLayoutManager
其中有CardView
个项目.单击时有一个浮动操作按钮,项目应滚动到顶部.我试过将scrollToPosition
以及scrollToPositionWithOffset
与RecyclerView
以及LinearLayoutManager
一起使用,如下所示.但这根本没有效果.为什么会这样呢?谁能帮帮我.
我已经将RecyclerView
直接放在xml文件的SwipeRefreshView
内部.将适配器设置为RecyclerView
后,我会立即呼叫setFloatingActionButton
.
public void setFloatingActionButton(final View view) {
float = (android.support.design.widget.FloatingActionButton) getActivity().findViewById(R.id.float);
float.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mRecyclerView.smoothScrollToPosition(0);
android.support.design.widget.Snackbar.make(view, "Scrolled to Top", android.support.design.widget.Snackbar.LENGTH_SHORT)
.setAction("Ok", new View.OnClickListener() {
@Override
public void onClick(View v) {
LinearLayoutManager llm = (LinearLayoutManager) mRecyclerView.getLayoutManager();
llm.scrollToPosition(0);
}
})
.setActionTextColor(getActivity().getResources().getColor(R.color.coloLink))
.show();
}
});
}
从上述注释继续,理想情况下,替换
mRecyclerView.smoothScrollToPosition(0);
使用
的浮动操作按钮onClick
中的
mLayoutManager.scrollToPositionWithOffset(0, 0);
应该工作.您也可以删除SnackBar
代码,因为无论如何您都不需要它.因此,您上面的所有方法都应该看起来像
public void setFloatingActionButton(final View view) {
float actionButton = (android.support.design.widget.FloatingActionButton) getActivity()
.findViewById(R.id.float);
actionButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
LinearLayoutManager layoutManager = (LinearLayoutManager) mRecyclerView
.getLayoutManager();
layoutManager.scrollToPositionWithOffset(0, 0);
}
});
}
如果您说上述方法不起作用,请测试onClick()
是否被调用.尝试在其中添加一条日志消息,看看它是否已打印.
I have a fragment in which there is RecyclerView
with LinearLayoutManager
in which there are CardView
items. There is a floating action button on clicking which the items should scroll to top. I have tried using scrollToPosition
as well as scrollToPositionWithOffset
with RecyclerView
and also with LinearLayoutManager
as shown below. But it has no effect at all. Why is this so? Can anyone please help me out.
And i have placed the RecyclerView
directly inside the SwipeRefreshView
in the xml file. I am calling setFloatingActionButton
as soon as set adapter to RecyclerView
.
public void setFloatingActionButton(final View view) {
float = (android.support.design.widget.FloatingActionButton) getActivity().findViewById(R.id.float);
float.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mRecyclerView.smoothScrollToPosition(0);
android.support.design.widget.Snackbar.make(view, "Scrolled to Top", android.support.design.widget.Snackbar.LENGTH_SHORT)
.setAction("Ok", new View.OnClickListener() {
@Override
public void onClick(View v) {
LinearLayoutManager llm = (LinearLayoutManager) mRecyclerView.getLayoutManager();
llm.scrollToPosition(0);
}
})
.setActionTextColor(getActivity().getResources().getColor(R.color.coloLink))
.show();
}
});
}
Continuing from above comments, ideally, replacing
mRecyclerView.smoothScrollToPosition(0);
in the onClick
of the floating action button with
mLayoutManager.scrollToPositionWithOffset(0, 0);
should work. You can also remove the SnackBar
code, because you don't need it anyways. So, all in all your above method should look like
public void setFloatingActionButton(final View view) {
float actionButton = (android.support.design.widget.FloatingActionButton) getActivity()
.findViewById(R.id.float);
actionButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
LinearLayoutManager layoutManager = (LinearLayoutManager) mRecyclerView
.getLayoutManager();
layoutManager.scrollToPositionWithOffset(0, 0);
}
});
}
And if you say that the above doesnt work, then test if the onClick()
is even being called or not. Try adding a log message in it and see if its printed.
这篇关于使用LinearLayoutManager滚动到RecyclerView的顶部的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!