一旦顶部的 recyclerview 变大，如何使固定在布局底部的按钮滚动 [英] How do I make my button which is fixed at the bottom of a layout scroll, once the recyclerview on top grows in size
本文介绍了一旦顶部的 recyclerview 变大，如何使固定在布局底部的按钮滚动的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有一个非常基本但困难的问题，我在视图底部固定了一个按钮，但在 recyclerview 容器下方.一旦容器大小增加，我希望按钮位于回收视图(可滚动)下方，而不是固定在视图底部.有没有办法实现这一点?
I have a very basic yet difficult issue where I have a button fixed at the bottom of the view, but below recyclerview container. Once the container size grows, I want the button to go below the recyclerview (scrollable) instead of being fixed at the bottom of the view.Is there a way to achieve this?
我在网上寻找了一些想法，但还没有找到类似的东西.
I have looked online for a couple of ideas but didn't find anything quite like it yet.
我基本上使用
<?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"
android:background="@color/white"
android:clickable="false">
<android.support.design.widget.CoordinatorLayout
android:id="@+id/cl_root_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clipChildren="false">
<LinearLayout
android:id="@+id/activity_g"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:elevation="0dp">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/white"
app:subtitleTextColor="@color/white"
app:titleTextAppearance="@style/Toolbar.TitleText"
app:titleTextColor="@color/white">
<TextView
android:id="@+id/nav_back_btn"
style="@style/Body1RegLeftBlack"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:layout_marginStart="@dimen/activity_horizontal_margin"
android:gravity="center_horizontal"
android:background="@drawable/ic_backarrow" />
<TextView
android:id="@+id/g_main_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="18dp"
android:layout_marginTop="15dp"
android:letterSpacing="0.01"
android:gravity="center_horizontal"
android:text="@string/g"
android:textAppearance="@style/TextAppearance.Text.Roboto.Medium"
android:textColor="#de000000"
android:textSize="20sp"
android:textStyle="normal"
/>
</android.support.v7.widget.Toolbar>
</android.support.design.widget.AppBarLayout>
<android.support.v4.widget.NestedScrollView
android:id="@+id/info_scrollview"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:id="@+id/infoContainer"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/white"
android:clickable="false"
android:orientation="vertical">
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="30dp">
<TextView
android:id="@+id/info_location"
style="@style/Headline2LeftBlack"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="@dimen/activity_horizontal_margin"
android:textAppearance="@style/TextAppearance.Text.Chronicle"
android:textSize="28sp"
tools:text="@string/five_thirty_fifth_ave" />
<TextView
style="@style/Body1RegRightRed"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/info_location"
android:layout_alignParentEnd="true"
android:layout_marginEnd="@dimen/activity_horizontal_margin"
android:layout_toEndOf="@+id/info_location"
android:text="@string/location_change"
android:textAppearance="@style/TextAppearance.Text.Roboto.Regular"
android:visibility="gone" />
</RelativeLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="48dp"
android:layout_marginTop="44dp"
android:gravity="center_vertical"
android:weightSum="2">
<TextView
style="@style/Body1RegLeftBlack"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_weight="1"
android:id="@+id/g_start_date"
android:textAppearance="@style/TextAppearance.Text.Roboto.Regular"
android:text="@string/g_start_date" />
<TextView
style="@style/Body1RegRightBlack"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="16dp"
android:layout_weight="1"
android:id="@+id/g_start_time"
android:textAppearance="@style/TextAppearance.Text.Roboto.Regular"
android:text="@string/g_start_time" />
</LinearLayout>
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="@color/registerUserSeparatorColor" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="48dp"
android:gravity="center_vertical"
android:weightSum="2">
<TextView
style="@style/Body1RegLeftBlack"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_weight="1"
android:id="@+id/g_end_date"
android:textAppearance="@style/TextAppearance.Text.Roboto.Regular"
android:visibility="invisible"
android:text="@string/g_end_date" />
<TextView
style="@style/Body1RegRightBlack"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="16dp"
android:layout_weight="1"
android:id="@+id/g_end_time"
android:textAppearance="@style/TextAppearance.Text.Roboto.Regular"
android:text="@string/g_end_time" />
</LinearLayout>
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="@color/registerUserSeparatorColor" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginTop="28dp"
android:letterSpacing="0.01"
android:lineSpacingExtra="4sp"
android:paddingTop="30dp"
android:textAppearance="@style/TextAppearance.Text.Roboto.Medium"
android:textColor="@color/black"
android:textSize="20sp"
android:textStyle="normal"
android:text="@string/g" />
<android.support.v7.widget.RecyclerView
android:id="@+id/g_item_list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:overScrollMode="never"
android:divider="@null"
tools:listitem="@layout/item_g"/>
<TextView
style="@style/Body1RegLeftRed"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16sp"
android:layout_marginTop="20dp"
android:id="@+id/add_g"
android:lineHeight="22sp"
android:text="@string/add_g"
android:textSize="16sp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginTop="58dp"
android:letterSpacing="0.01"
android:lineSpacingExtra="4sp"
android:visibility="invisible"
android:textAppearance="@style/TextAppearance.Text.Roboto.Medium"
android:textColor="@color/black"
android:textSize="20sp"
android:textStyle="normal"
android:text="@string/arrival_notifications" />
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:visibility="gone"
android:id="@+id/text_message_container"
android:layout_marginStart="16dp">
<TextView
android:id="@+id/text_message"
style="@style/Body1RegLeftBlack"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="11dp"
android:textAppearance="@style/TextAppearance.Text.Roboto.Regular"
android:text="@string/text_message" />
<TextView
style="@style/Body2RegLeftGrey"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/text_message"
android:layout_marginTop="2dp"
android:id="@+id/tap_phone_number_text"
android:textAppearance="@style/TextAppearance.Text.Roboto.Regular"
android:text="@string/tap_to_add_a_phone_number" />
<android.support.v7.widget.SwitchCompat
android:id="@+id/text_message_switch"
style="@style/Color1SwitchStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_centerVertical="true"
android:layout_marginEnd="16dp" />
</RelativeLayout>
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:layout_marginStart="16dp"
android:visibility="gone"
android:layout_marginTop="11dp"
android:background="@color/settingsSeparatorLineColor" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="16sp"
android:layout_marginTop="100dp"
android:textAppearance="@style/TextAppearance.Text.Roboto.Medium"
android:textStyle="normal"
android:letterSpacing="0.07"
android:lineSpacingExtra="0sp"
android:layout_gravity="center"
android:layout_marginBottom="30dp"
android:id="@+id/submit_btn"
android:text="@string/submit_list"
/>
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
</LinearLayout>
</android.support.design.widget.CoordinatorLayout>
</android.support.design.widget.CoordinatorLayout>
上面的问题是，submit_list btn 不会保持固定，如果 recyclerview 增长但视图中仍有足够的空间可用.
The problem above is, the submit_list btn doesnt stay fixed, if the recyclerview grows but theres still enough space to spare in the view.
我想让按钮保持固定并且不会滚动，直到 recyclerview 的大小超出底部的某个限制(在屏幕上不再可见)，之后按钮相对于最后一项滚动recyclerview 的视图，不再与底部对齐.任何想法如何去做?
I want to make it such that the button stays fixed and doesnt scroll UNTIL the size of the recyclerview goes beyond a certain limit from the bottom(not visible on the screen anymore), after which the button scrolls relative to the last item of the recyclerview and not aligned to the bottom anymore. any ideas how to go about it?
举个直观的例子:
如您所见，初始屏幕的提交按钮与底部对齐，其余内容均已就位.当我添加更多用户时:
As you can see, initial screen has submit button aligned to the bottom and the rest of the content in place. As I add more users:
它仍然停留在底部，因为 recyclerview 项目仍在屏幕内现在，只要我再添加一项，就会导致列表向上滚动:
It still stays at the bottom since the recyclerview items are still within screen now, aqs soon as i add one more item, causing the list to scroll up :
正如所见，我希望它位于 recyclerview 下方，而不是固定在屏幕底部(上面的屏幕截图来自它工作的 ios)，想知道我们是否可以为 android 做同样的事情?
As seen I want it to go below the recyclerview instead of stay fixed at bottom of the screen (the above screenshots are from ios where it works), was wondering if we can do the same for android?
推荐答案
这是一个演示链接
还有一个 Gif 链接
public class WeirdStickyBottomActivity extends AppCompatActivity {
private RecyclerView mRecyclerView;
private TextView mStickyView;
private LinearLayoutManager mLayoutManager;
private MyAdapter mAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_weird_sticky_bottom);
mRecyclerView = findViewById(R.id.recyclerview);
mStickyView = findViewById(R.id.sticky);
Button mAddButton = findViewById(R.id.button_add);
Button mDeleteButton = findViewById(R.id.button_delete);
mLayoutManager = new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false);
mRecyclerView.setLayoutManager(mLayoutManager);
mRecyclerView.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.VERTICAL));
mAdapter = new MyAdapter(this);
mRecyclerView.setAdapter(mAdapter);
hideStickyLayoutIfNeed();
mAddButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mAdapter.addItems();
hideStickyLayoutIfNeed();
}
});
mDeleteButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mAdapter.deleteItems();
hideStickyLayoutIfNeed();
}
});
mStickyView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(WeirdStickyBottomActivity.this, "Sticky Click", Toast.LENGTH_SHORT).show();
}
});
}
private void hideStickyLayoutIfNeed() {
mRecyclerView.getViewTreeObserver().addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
@Override
public boolean onPreDraw() {
mRecyclerView.getViewTreeObserver().removeOnPreDrawListener(this);
int firstVisible = mLayoutManager.findFirstVisibleItemPosition();
int lastCompletelyVisible = mLayoutManager.findLastCompletelyVisibleItemPosition();
//adapter list size display beyond the screen
if (firstVisible > 0 || lastCompletelyVisible < mAdapter.getItemCount() - 1) {
mAdapter.addStickyItem(true);
if (mStickyView.getVisibility() == View.VISIBLE) {
mStickyView.setVisibility(View.GONE);
}
} else if (firstVisible == 0 && lastCompletelyVisible == mAdapter.getItemCount() - 1) {
if (mStickyView.getVisibility() != View.VISIBLE) {
mStickyView.setVisibility(View.VISIBLE);
}
}
mRecyclerView.smoothScrollToPosition(mAdapter.getItemCount() - 1);
return true;
}
});
}
private static class MyAdapter extends RecyclerView.Adapter<ItemHolder> {
private int mStickyIndex = -1;
static final int HOLDER_TYPE_NORMAL = 1;
static final int HOLDER_TYPE_STICKY = 2;
private List<String> dataList = new ArrayList<>();
private Context mContext;
MyAdapter(Context context) {
this.mContext = context;
addItems();
}
public void addItems() {
boolean hasStickyItem = mStickyIndex > 0;
if (hasStickyItem) {
dataList.remove(mStickyIndex);
mStickyIndex = -1;
}
int size = dataList.size();
for (int i = size; i < size + 5; i++) {
dataList.add("This is a item");
}
notifyDataSetChanged();
}
public void deleteItems() {
int size = dataList.size();
if (size < 6) {
return;
}
boolean hasStickyItem = mStickyIndex > 0;
if (hasStickyItem) {
dataList.remove(mStickyIndex);
mStickyIndex = -1;
}
if (size > size - 5) {
dataList.subList(size - 5, size - 1).clear();
}
notifyDataSetChanged();
}
public void addStickyItem(boolean notify) {
//did not add sticky item before
if (mStickyIndex <= 0) {
mStickyIndex = dataList.size();
dataList.add(mContext.getResources().getString(R.string.sticky_layout));
if (notify) {
notifyDataSetChanged();
}
}
}
@NonNull
@Override
public ItemHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
return ItemHolder.create(parent, viewType == HOLDER_TYPE_STICKY);
}
@Override
public void onBindViewHolder(@NonNull ItemHolder holder, int position) {
holder.bind(dataList.get(position));
}
@Override
public int getItemCount() {
return dataList.size();
}
@Override
public int getItemViewType(int position) {
if (position == mStickyIndex) {
return HOLDER_TYPE_STICKY;
}
return HOLDER_TYPE_NORMAL;
}
}
private static class ItemHolder extends RecyclerView.ViewHolder {
private TextView textView;
private boolean isSticky;
private ItemHolder(@NonNull View itemView, boolean isSticky) {
super(itemView);
textView = itemView.findViewById(R.id.text);
this.isSticky = isSticky;
}
void bind(String text) {
textView.setText(text);
if (isSticky) {
textView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(v.getContext(), "Sticky Click", Toast.LENGTH_SHORT).show();
}
});
textView.setBackgroundColor(textView.getResources().getColor(R.color.colorPrimary));
} else {
textView.setOnClickListener(null);
textView.setBackgroundColor(Color.WHITE);
}
}
static ItemHolder create(ViewGroup parent, boolean isSticky) {
return new ItemHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.layout_item, parent, false), isSticky);
}
}
}
<?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"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<android.support.design.widget.AppBarLayout
android:id="@+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true"
android:orientation="vertical"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
app:layout_behavior="android.support.design.widget.AppBarLayout$Behavior">
<android.support.design.widget.CollapsingToolbarLayout
android:id="@+id/toolbar_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true"
app:contentScrim="?attr/colorPrimary"
app:expandedTitleMarginEnd="64dp"
app:expandedTitleMarginStart="48dp"
app:layout_scrollFlags="scroll|exitUntilCollapsed"
app:title="Collapse">
<android.support.v7.widget.Toolbar
android:id="@+id/tb_toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_collapseMode="pin"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
app:title="@string/app_name">
<Button
android:id="@+id/button_add"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/button_add" />
<Button
android:id="@+id/button_delete"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/button_delete" />
</android.support.v7.widget.Toolbar>
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<FrameLayout
android:id="@+id/sticky_parent"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerview"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<TextView
android:id="@+id/sticky"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_gravity="bottom"
android:background="@color/colorPrimary"
android:gravity="center"
android:text="@string/sticky_layout" />
</FrameLayout>
</android.support.design.widget.CoordinatorLayout>
这篇关于一旦顶部的 recyclerview 变大，如何使固定在布局底部的按钮滚动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！
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