片段中的RecyclerView无法正常工作

时间：2015-12-01 02:07:33

标签： java android android-fragments android-recyclerview

我想在其中加RecyclerView {。}}。

问题是我得到了一些奇怪的东西。如下面的屏幕截图所示（注意另一张卡与下面的卡重叠 - 以下卡片只是我想要显示的内容）：

enter image description here

这是Cards文件的代码：

ListContentAAR.java

这是class ListContentAAR { int hImage; String hPicTag; String hDescription; String hLocation; Button btn_accept; Button btn_share; String postDate; String postTime; String postedBy; ListContentAAR(int hImage, String hPicTag, String hDescription, String hLocation, Button btn_accept, Button btn_share, String postDate, String postTime, String postedBy) { this.hImage = hImage; this.hPicTag = hPicTag; this.hDescription = hDescription; this.hLocation = hLocation; this.btn_accept = btn_accept; this.btn_share = btn_share; this.postDate = postDate; this.postTime = postTime; this.postedBy = postedBy; } } 文件的代码：

RVAdapterAAR.java

这是public class RVAdapterAAR extends RecyclerView.Adapter<RVAdapterAAR.PersonViewHolder> { public static class PersonViewHolder extends RecyclerView.ViewHolder { CardView cardView; ImageView hImage; TextView hPicTag; TextView hDescription; TextView hLocation; Button btn_accept; Button btn_share; TextView postDate; TextView postTime; TextView postedBy; PersonViewHolder(View itemView) { super(itemView); cardView = (CardView) itemView.findViewById(R.id.card_accept_request); hImage = (ImageView) itemView.findViewById(R.id.h_pic_accept); hPicTag = (TextView) itemView.findViewById(R.id.h_pic_tag); hDescription = (TextView) itemView.findViewById(R.id.h_description_accept); hLocation = (TextView) itemView.findViewById(R.id.h_location_tag); btn_accept = (Button) itemView.findViewById(R.id.btn_accept); btn_share = (Button) itemView.findViewById(R.id.btn_share); postDate = (TextView) itemView.findViewById(R.id.post_date); postTime = (TextView) itemView.findViewById(R.id.post_time); postedBy = (TextView) itemView.findViewById(R.id.posted_by); } } List<ListContentAAR> listContentAARs; RVAdapterAAR(List<ListContentAAR> listContentAARs) { this.listContentAARs = listContentAARs; } public void onAttachedToRecyclerView(RecyclerView recyclerView) { super.onAttachedToRecyclerView(recyclerView); } public PersonViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) { View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.fragment_accept_a_request, viewGroup, false); PersonViewHolder personViewHolder = new PersonViewHolder(view); return personViewHolder; } public void onBindViewHolder (PersonViewHolder personViewHolder, int i) { personViewHolder.hImage.setImageResource(listContentAARs.get(i).hImage); personViewHolder.hPicTag.setText(listContentAARs.get(i).hPicTag); personViewHolder.hDescription.setText(listContentAARs.get(i).hDescription); personViewHolder.hLocation.setText(listContentAARs.get(i).hLocation); // something for btn_accept // something for btn_share personViewHolder.postDate.setText(listContentAARs.get(i).postDate); personViewHolder.postTime.setText(listContentAARs.get(i).postTime); personViewHolder.postedBy.setText(listContentAARs.get(i).postedBy); } public int getItemCount() { return listContentAARs.size(); } } 文件的代码：

AcceptARequest.java

这是public class AcceptARequest extends Fragment{ // TODO: Rename parameter arguments, choose names that match // the fragment initialization parameters, e.g. ARG_ITEM_NUMBER private static final String ARG_PARAM1 = "param1"; private static final String ARG_PARAM2 = "param2"; // TODO: Rename and change types of parameters private String mParam1; private String mParam2; private OnFragmentInteractionListener mListener; public List<ListContentAAR> listContentAARs; public RecyclerView recyclerView; public AcceptARequest() { // Required empty public constructor } /** * Use this factory method to create a new instance of * this fragment using the provided parameters. * * @param param1 Parameter 1. * @param param2 Parameter 2. * @return A new instance of fragment AcceptARequest. */ // TODO: Rename and change types and number of parameters public static AcceptARequest newInstance(String param1, String param2) { AcceptARequest fragment = new AcceptARequest(); Bundle args = new Bundle(); args.putString(ARG_PARAM1, param1); args.putString(ARG_PARAM2, param2); fragment.setArguments(args); return fragment; } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); if (getArguments() != null) { mParam1 = getArguments().getString(ARG_PARAM1); mParam2 = getArguments().getString(ARG_PARAM2); } } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // Inflate the layout for this fragment View rootView = inflater.inflate(R.layout.fragment_accept_a_request, container, false); recyclerView = (RecyclerView) rootView.findViewById(R.id.accept_request_list); LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getActivity()); recyclerView.setLayoutManager(linearLayoutManager); recyclerView.setHasFixedSize(true); initializeData(); initializeAdapter(); return rootView; } private void initializeData(){ listContentAARs = new ArrayList<>(); listContentAARs.add(new ListContentAAR(R.drawable.ic_action_facebook, "H pic goes here", "H description goes here", "H location goes here", R.id.btn_accept, R.id.btn_share, "date", "time", "posted by")); } private void initializeAdapter(){ RVAdapterAAR adapter = new RVAdapterAAR(listContentAARs); recyclerView.setAdapter(adapter); } // TODO: Rename method, update argument and hook method into UI event public void onButtonPressed(Uri uri) { if (mListener != null) { mListener.onFragmentInteraction(uri); } } @Override public void onDetach() { super.onDetach(); mListener = null; } /** * This interface must be implemented by activities that contain this * fragment to allow an interaction in this fragment to be communicated * to the activity and potentially other fragments contained in that * activity. * <p/> * See the Android Training lesson <a href= * "http://developer.android.com/training/basics/fragments/communicating.html" * >Communicating with Other Fragments</a> for more information. */ public interface OnFragmentInteractionListener { // TODO: Update argument type and name void onFragmentInteraction(Uri uri); } } 文件的代码：

fragment_accept_a_request.xml

这是<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="wrap_content" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" android:paddingBottom="@dimen/activity_vertical_margin" xmlns:app="http://schemas.android.com/apk/res-auto" tools:context="com.abc.xyz.AcceptARequest"> <include layout="@layout/accept_a_request_recyclerview"/> <android.support.v7.widget.RecyclerView android:id="@+id/accept_request_list" android:layout_width="match_parent" android:layout_height="match_parent" app:layout_behavior="@string/appbar_scrolling_view_behavior"> </android.support.v7.widget.RecyclerView> </RelativeLayout> 文件的代码：

accept_a_request_recyclerview.xml

由于我是初学者，我完全不知道这里出了什么问题！

2 个答案:

答案 0 :(得分：1)

错误在于onCreateViewHolder你应该只扩充recyclerView项目的内容，而不是非常的RecyclerView。正确的实现如下：

recyclerview_item.xml 

<android.support.v7.widget.CardView
    android:id="@+id/card_accept_request"
    android:layout_width="match_parent"
    android:layout_height="@dimen/card_accept_request"
    app:cardElevation="2dp"
    app:cardUseCompatPadding="true"
    app:contentPadding="10dp">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

    <ImageView
        android:id="@+id/h_pic_accept"
        android:layout_width="match_parent"
        android:layout_height="@dimen/h_pic_dimen_accept"
        android:layout_gravity="center_horizontal|center_vertical"/>

    <TextView
        android:id="@+id/h_pic_tag"
        android:layout_width="match_parent"
        android:layout_height="@dimen/h_pic_dimen_accept"
        android:text="H pic goes here"
        android:gravity="center_horizontal|center_vertical"/>

    <TextView
        android:id="@+id/h_description_accept"
        android:layout_below="@+id/h_pic_tag"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center_horizontal|center_vertical"
        android:text="H description goes here"
        android:maxLines="5"/>

    <TextView
        android:id="@+id/h_location_tag"
        android:layout_below="@id/h_description_accept"
        android:layout_width="match_parent"
        android:layout_height="@dimen/h_pic_dimen_accept"
        android:text="H location goes here"
        android:gravity="center_horizontal|center_vertical"
        android:paddingTop="@dimen/paddings"
        android:paddingBottom="@dimen/paddings"/>

        <LinearLayout
            android:id="@+id/btn_accept_share_container"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:layout_below="@id/homeless_location_tag">

    <Button
        android:id="@+id/btn_accept"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/btn_accept"
        android:textColor="@color/colorPrimary"
        style="?android:attr/borderlessButtonStyle"/>

            <Button
                android:id="@+id/btn_share"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/btn_share"
                android:textColor="@color/colorPrimary"
                style="?android:attr/borderlessButtonStyle"/>

        </LinearLayout>

        <LinearLayout
            android:id="@+id/date_time_container"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignEnd="@+id/btn_accept_share_container"
            android:layout_alignRight="@+id/btn_accept_share_container"
            android:orientation="vertical"
            android:layout_below="@id/homeless_location_tag">

        <TextView
            android:id="@+id/post_date"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="date"/>

            <TextView
                android:id="@+id/post_time"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="time"/>

        </LinearLayout>

        <TextView
            android:id="@+id/posted_by"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="posted by [name]"
            android:layout_alignParentBottom="true"
            android:layout_alignParentEnd="true"
            android:layout_alignParentRight="true"/>

    </RelativeLayout>

</android.support.v7.widget.CardView>

your_fragment_layout.xml 

  <android.support.v7.widget.RecyclerView
    android:id="@+id/accept_request_list"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior">

</android.support.v7.widget.RecyclerView>

在你的活动中，你从your_fragment_layout.xml中膨胀碎片 然后在onCreateViewHolder中你应该替换这一行：

View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.fragment_accept_a_request, viewGroup, false);

在这一行：

View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.recyclerview_item, viewGroup, false);

答案 1 :(得分：1)

在解决了这个问题之后，我终于找到了解决方案。

很简单。

我刚刚将RelativeLayout更改为LinearLayout，它就像一个魅力！

这是最终fragment_accept_a_request.xml文件的代码：

<LinearLayout 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:paddingLeft="@dimen/activity_horizontal_margin"
                android:paddingRight="@dimen/activity_horizontal_margin"
                android:paddingTop="@dimen/activity_vertical_margin"
                android:paddingBottom="@dimen/activity_vertical_margin"
                android:orientation="vertical"
                xmlns:app="http://schemas.android.com/apk/res-auto"
                tools:context="com.humanehelper.humanehelper.AcceptARequest">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/accept_request_list"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"/>

    <include layout="@layout/accept_a_request_recyclerview"/>

</LinearLayout>

和此处的accept_a_request_recyclerview.xml文件代码：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
                xmlns:tools="http://schemas.android.com/tools"
                tools:showIn="@layout/fragment_accept_a_request">

    <android.support.v7.widget.CardView
        android:id="@+id/card_accept_request"
        android:layout_width="match_parent"
        android:layout_height="@dimen/card_accept_request"
        app:cardElevation="2dp"
        app:cardUseCompatPadding="true"
        app:contentPadding="10dp">

        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <ImageView
                android:id="@+id/h_pic_accept"
                android:layout_width="match_parent"
                android:layout_height="@dimen/h_pic_dimen_accept"
                android:layout_gravity="center_horizontal|center_vertical"/>

            <TextView
                android:id="@+id/h_pic_tag"
                android:layout_width="match_parent"
                android:layout_height="@dimen/homeless_pic_dimen_accept"
                android:text="h pic goes here"
                android:gravity="center_horizontal|center_vertical"/>

            <TextView
                android:id="@+id/h_description_accept"
                android:layout_below="@+id/h_pic_tag"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="center_horizontal|center_vertical"
                android:text="h description goes here"
                android:maxLines="5"/>

            <TextView
                android:id="@+id/h_location_tag"
                android:layout_below="@id/h_description_accept"
                android:layout_width="match_parent"
                android:layout_height="@dimen/h_pic_dimen_accept"
                android:text="h location goes here"
                android:gravity="center_horizontal|center_vertical"
                android:paddingTop="@dimen/paddings"
                android:paddingBottom="@dimen/paddings"/>

            <LinearLayout
                android:id="@+id/btn_accept_share_container"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="horizontal"
                android:layout_below="@id/h_location_tag">

                <Button
                    android:id="@+id/btn_accept"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="@string/btn_accept"
                    android:textColor="@color/colorPrimary"
                    style="?android:attr/borderlessButtonStyle"/>

                <Button
                    android:id="@+id/btn_share"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="@string/btn_share"
                    android:textColor="@color/colorPrimary"
                    style="?android:attr/borderlessButtonStyle"/>

            </LinearLayout>

            <LinearLayout
                android:id="@+id/date_time_container"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignEnd="@+id/btn_accept_share_container"
                android:layout_alignRight="@+id/btn_accept_share_container"
                android:orientation="vertical"
                android:layout_below="@id/homeless_location_tag">

                <TextView
                    android:id="@+id/post_date"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="date"/>

                <TextView
                    android:id="@+id/post_time"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="time"/>

            </LinearLayout>

            <TextView
                android:id="@+id/posted_by"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="posted by [name]"
                android:layout_alignParentBottom="true"
                android:layout_alignParentEnd="true"
                android:layout_alignParentRight="true"/>

        </RelativeLayout>

    </android.support.v7.widget.CardView>

</LinearLayout>
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