标签: android-recyclerview

如何在Android的RecyclerView中添加一个简单的8dp页眉/页脚？

有没有办法将简单的页眉/页脚添加到RecyclerView？

在这里你可以看到我所拥有的.第一张卡片触及工具栏这就是我所拥有的

在这里你可以看到我想要的东西.底部和卡之间的8dp填充. 这就是我想要的

我到目前为止尝试的方法:

在我的recyclerview中使用标题视图.但我认为对每个回收者来说都是非常有效的.

使用8dp的上边距,这会导致Recyclerview在滚动时在顶部/底部有白条的问题.

在列表项中添加填充,这会导致外卡和内卡之间的边距不同.

我确信到目前为止我还不知道有一个简单的解决方案.

android margin padding android-recyclerview

Phi*_*ann

lucky-day

122
推荐指数

1
解决办法

3万
查看次数

Android 5.0 - 将页眉/页脚添加到RecyclerView

我花了一些时间试图找出一种方法来添加一个标题RecyclerView,但没有成功.这是我到目前为止所得到的:

@Override
protected void onCreate(Bundle savedInstanceState) {
    ...

    layouManager = new LinearLayoutManager(getActivity());
    recyclerView.setLayoutManager(layouManager);

    LayoutInflater inflater = (LayoutInflater) getActivity().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    headerPlaceHolder = inflater.inflate(R.layout.view_header_holder_medium, null, false);
    layouManager.addView(headerPlaceHolder, 0);

   ...
}

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在LayoutManager似乎是处理的配置对象RecyclerView的项目.因为我无法找到任何addHeaderView(View view)方法,我决定去与LayoutManager的addView(View view, int position)方法,并增加我的头鉴于第一位置,像一个头.

Aaand这是事情变得更加丑陋的地方:

java.lang.NullPointerException: Attempt to read from field 'android.support.v7.widget.RecyclerView$ViewHolder android.support.v7.widget.RecyclerView$LayoutParams.mViewHolder' on a null object reference
    at android.support.v7.widget.RecyclerView.getChildViewHolderInt(RecyclerView.java:2497)
    at android.support.v7.widget.RecyclerView$LayoutManager.addViewInt(RecyclerView.java:4807)
    at android.support.v7.widget.RecyclerView$LayoutManager.addView(RecyclerView.java:4803)
    at com.mathieumaree.showz.fragments.CategoryFragment.setRecyclerView(CategoryFragment.java:231)
    at com.mathieumaree.showz.fragments.CategoryFragment.access$200(CategoryFragment.java:47)
    at com.mathieumaree.showz.fragments.CategoryFragment$2.success(CategoryFragment.java:201)
    at com.mathieumaree.showz.fragments.CategoryFragment$2.success(CategoryFragment.java:196)
    at retrofit.CallbackRunnable$1.run(CallbackRunnable.java:41)
    at android.os.Handler.handleCallback(Handler.java:739)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:135) …

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java android android-5.0-lollipop android-recyclerview

Mat*_*ree

2019 09-04

120
推荐指数

7
解决办法

12万
查看次数

了解RecyclerView setHasFixedSize

我理解起来有些困难setHasFixedSize().我知道,当RecyclerView文档中的大小不变时,它用于优化.

这意味着什么？在大多数常见情况下,ListView几乎总是具有固定的大小.在什么情况下它不是固定的大小？这是否意味着它在屏幕上占据的实际房地产随着内容的增长而增长？

android android-5.0-lollipop android-recyclerview

SIr*_*lot

2015 02-25

120
推荐指数

5
解决办法

6万
查看次数

CardView layout_width ="match_parent"与父级RecyclerView宽度不匹配

我有一个包含RecyclerView的片段,其layout_width ="match_parent":

<android.support.v7.widget.RecyclerView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_gravity="center"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context=".MainActivity$PlaceholderFragment" />

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RecyclerView中的项目是CardView,其layout_width ="match_parent":

<android.support.v7.widget.CardView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    android:id="@+id/card_view"
    android:layout_gravity="center"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_margin="20dp"
    card_view:cardCornerRadius="4dp">

    <TextView
        android:layout_gravity="center"
        android:id="@+id/info_text"
        android:layout_width="match_parent"
        android:gravity="center"
        android:layout_height="match_parent"
        android:textAppearance="?android:textAppearanceLarge"/>
</android.support.v7.widget.CardView>

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我将物品视图膨胀如下:

public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent,
                                                   int viewType) {
        CardView v = (CardView) LayoutInflater.from(parent.getContext())
                .inflate(R.layout.card_listitem, null, true);

        ViewHolder vh = new ViewHolder(v);
        return vh;
    }

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但是当我运行应用程序时,CardView呈现为wrap_content,如下所示:

CardsBug

请注意,这是在模拟器上运行,而不是在真实设备上运行.

我做错了什么,还是一个错误？

android android-layout android-cardview android-5.0-lollipop android-recyclerview

Pro*_*mar

2014 07-01

118
推荐指数

5
解决办法

6万
查看次数

对RecyclerView滑动以关闭

我曾经使用SwipeToDismiss库,但现在我正在尝试迁移到RecyclerView,事情并不那么明显,你知道这个lib的替代品吗？任何想法如何从头开始实现它？

android android-recyclerview

Vik*_*nin

lucky-day

116
推荐指数

3
解决办法

8万
查看次数

如何在回收器视图适配器中获取上下文

我正在尝试使用picasso库来加载url到imageView,但我无法context正确使用picasso库.

public class FeedAdapter extends RecyclerView.Adapter<FeedAdapter.ViewHolder> {
    private List<Post> mDataset;



    // Provide a reference to the views for each data item
    // Complex data items may need more than one view per item, and
    // you provide access to all the views for a data item in a view holder
    public class ViewHolder extends RecyclerView.ViewHolder {
        // each data item is just a string in this case
        public TextView txtHeader;
        public ImageView pub_image;
        public ViewHolder(View v) {
            super(v); …

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java android android-context picasso android-recyclerview

Str*_* B.

2017 02-28

116
推荐指数

9
解决办法

8万
查看次数

显示单一项目的Recycler视图

我面临一个奇怪的错误,其中recyclerview只显示一个项目.以下是我的recyclerview适配器的代码:

public class ChatAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {


List<chat> chats;
String username;
final int My=0,Their=1;

public ChatAdapter(List<chat> chats) {
    this.chats = chats;
    this.username = PushApp.getApp().getSPF().getStringData(Constants.ANAME);
}


@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    RecyclerView.ViewHolder viewHolder;
    LayoutInflater inflater = LayoutInflater.from(parent.getContext());

    switch (viewType) {
        case My:
            View v1 = inflater.inflate(R.layout.my_chat_child, parent, false);
            viewHolder = new MyChatHolder(v1);
            break;
        case Their:
            View v2 = inflater.inflate(R.layout.their_chat_child, parent, false);
            viewHolder = new TheirMessageHolder(v2);
            break;
        default:
            View v = inflater.inflate(R.layout.my_chat_child, parent, false);
            viewHolder = new MyChatHolder(v);
            break; …

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android recycler-adapter android-recyclerview

Ruj*_*993

2016 04-12

113
推荐指数

3
解决办法

4万
查看次数

match_parent width在RecyclerView中不起作用

我的RecyclerView和item有match_parent宽度,但结果是: 在此输入图像描述

    <view
    class="android.support.v7.widget.RecyclerView"
    android:layout_width="match_parent"

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和项目:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:fab="http://schemas.android.com/apk/res-auto"
android:id="@+id/ll_itm"
android:orientation="horizontal"
android:layout_width="match_parent"

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充分:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:fab="http://schemas.android.com/apk/res-auto"
android:id="@+id/ll_itm"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:weightSum="100"
android:gravity="right"
>


<Button
    android:layout_width="0dp"
    android:layout_weight="15"
    android:layout_height="fill_parent"
    android:text="???????"
    android:id="@+id/button" />

<LinearLayout
    android:layout_width="0dp"
    android:layout_height="fill_parent"
    android:layout_weight="20"
    android:gravity="center"
    >
    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        >

        <com.getbase.floatingactionbutton.FloatingActionButton
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            fab:fab_plusIconColor="#ff56ff83"
            fab:fab_colorNormal="@color/d_red"
            fab:fab_colorPressed="#ff5c86ff"
            fab:fab_size="mini"
            fab:fab_icon="@drawable/ic_remove_white"
            android:id="@+id/fab_rmv" />
        <esfandune.ir.elmikarbordiardakan.other.CustomTxtView
            android:layout_weight="25"
            android:layout_width="0dp"
            android:layout_height="fill_parent"
            android:textAppearance="?android:attr/textAppearanceLarge"
            android:text="0"
            android:gravity="right|center_vertical"
            android:id="@+id/txt_takhir_itm" />
        <com.getbase.floatingactionbutton.FloatingActionButton
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            fab:fab_plusIconColor="@color/colorprimarylight"
            fab:fab_colorNormal="@color/colorprimarydark"
            fab:fab_colorPressed="@color/colorprimary"
            fab:fab_size="mini"
            fab:fab_icon="@drawable/ic_add_white"
            android:id="@+id/fab_add" />

    </LinearLayout>
</LinearLayout>
    <Spinner
        android:layout_width="0dp"
        android:layout_height="fill_parent"
        android:layout_weight="10" …

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android android-recyclerview

ArM*_*372

2015 06-07

112
推荐指数

8
解决办法

5万
查看次数

NestedScrollView中的Recycler视图导致滚动从中间开始

当我在NestedScrollView中添加RecyclerView时,我得到一个奇怪的滚动行为.

发生的事情是,只要滚动视图的行数多于屏幕中显示的行数,一旦启动活动,NestedScrollView就会从顶部开始偏移(图像1).如果滚动视图中的项目很少,以便可以一次显示它们,则不会发生这种情况(图2).

我使用的是支持库的23.2.0版.

图1:错误 - 从顶部偏移开始

图2:正确 - 回收者视图中的几个项目

我粘贴在我的布局代码下面:

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.NestedScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_gravity="fill_vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:padding="10dp">

            <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:padding="16dp"
                android:orientation="vertical">

                <TextView
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:text="Title:"
                    style="@style/TextAppearance.AppCompat.Caption"/>

                <TextView
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:padding="@dimen/bodyPadding"
                    style="@style/TextAppearance.AppCompat.Body1"
                    android:text="Neque porro quisquam est qui dolorem ipsum"/>

                <TextView
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:text="Subtitle:"
                    style="@style/TextAppearance.AppCompat.Caption"/>

                <TextView
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    style="@style/TextAppearance.AppCompat.Body1"
                    android:padding="@dimen/bodyPadding"
                    android:text="Neque porro quisquam est qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit..."/>

            </LinearLayout>

        <android.support.v7.widget.RecyclerView
            android:id="@+id/rv"
            android:focusable="false" …

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android android-support-library android-recyclerview android-nestedscrollview

Luc*_*rea

2016 03-31

112
推荐指数

6
解决办法

5万
查看次数

"废弃或附加的视图可能无法回收"时,RecyclerView崩溃

我正在使用一个简单RecyclerView的Android网站实现,StaggeredGridLayoutManager并且我一直收到崩溃我的应用程序的错误:

java.lang.IllegalArgumentException: Scrapped or attached views may not be recycled. isScrap:false isAttached:true
            at android.support.v7.widget.RecyclerView$Recycler.recycleViewHolderInternal(RecyclerView.java:3501)
            at android.support.v7.widget.RecyclerView$LayoutManager.scrapOrRecycleView(RecyclerView.java:5355)
            at android.support.v7.widget.RecyclerView$LayoutManager.detachAndScrapAttachedViews(RecyclerView.java:5340)
            at android.support.v7.widget.StaggeredGridLayoutManager.onLayoutChildren(StaggeredGridLayoutManager.java:572)
            at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:1918)
            at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:2155)
            at android.view.View.layout(View.java:14008)
            at android.view.ViewGroup.layout(ViewGroup.java:4373)
            at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1021)
            at android.view.View.layout(View.java:14008)
            at android.view.ViewGroup.layout(ViewGroup.java:4373)
            at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
            at android.view.View.layout(View.java:14008)
            at android.view.ViewGroup.layout(ViewGroup.java:4373)
            at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
            at android.view.View.layout(View.java:14008)
            at android.view.ViewGroup.layout(ViewGroup.java:4373)
            at android.support.v7.internal.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:502)
            at android.view.View.layout(View.java:14008)
            at android.view.ViewGroup.layout(ViewGroup.java:4373)
            at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
            at android.view.View.layout(View.java:14008)
            at android.view.ViewGroup.layout(ViewGroup.java:4373)
            at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1663)
            at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1521)
            at android.widget.LinearLayout.onLayout(LinearLayout.java:1434)
            at android.view.View.layout(View.java:14008)
            at android.view.ViewGroup.layout(ViewGroup.java:4373)
            at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
            at android.view.View.layout(View.java:14008)
            at android.view.ViewGroup.layout(ViewGroup.java:4373)
            at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:1892) …

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android android-recyclerview

Sta*_*ter

2017 02-06

109
推荐指数

11
解决办法

4万
查看次数