Question

这里，只有构造函数正在调用并且数据正在arraylist中传递，但没有其他任何事情发生，没有其他函数正在调用 -

适配器代码

public class RentCarRecyclerAdapter extends 
RecyclerView.Adapter<RentCarRecyclerAdapter.MyViewHolder> {


    public  static   ArrayList<RentCarHolder> dataList;
    Context context;


    public RentCarRecyclerAdapter(Context c, ArrayList<RentCarHolder> list) {
        context = c;
        dataList = list;


    }


    public static class MyViewHolder extends RecyclerView.ViewHolder {

        ImageView carimage;
        TextView carname, rentprice, ageofdriver, numberofdoors, maxpeople, airconditioned, mileage, transmission, status;
        Button booknow;
        ProgressBar progressBar;

        public MyViewHolder(View itemView) {
            super(itemView);

            carimage = (ImageView) itemView.findViewById(R.id.carpic);
            carname = (TextView) itemView.findViewById(R.id.carname);
            rentprice = (TextView) itemView.findViewById(R.id.rentprice);
            ageofdriver = (TextView) itemView.findViewById(R.id.minimumdriverage);
            numberofdoors = (TextView) itemView.findViewById(R.id.doorcount);
            maxpeople = (TextView) itemView.findViewById(R.id.maxpeople);
            airconditioned = (TextView) itemView.findViewById(R.id.airconditioned);
            mileage = (TextView) itemView.findViewById(R.id.unlimitedmilage);
            transmission = (TextView) itemView.findViewById(R.id.transmission);
            booknow = (Button) itemView.findViewById(R.id.book);
            progressBar = (ProgressBar) itemView.findViewById(R.id.progress);
            status = (TextView) itemView.findViewById(R.id.status);


        }
    }


    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.row_rentacar, parent, false);
        MyViewHolder myViewHolder = new MyViewHolder(view);


        return myViewHolder;
    }

    @Override
    public void onBindViewHolder(final MyViewHolder holder, final int position) {
        holder.carname.setText(dataList.get(position).getCarname());
        holder.rentprice.setText(dataList.get(position).getRentprice());
        holder.ageofdriver.setText(dataList.get(position).getAgeofdriver());
        holder.numberofdoors.setText(dataList.get(position).getNumberofdoors());
        holder.maxpeople.setText(dataList.get(position).getMaxpeople());
        holder.airconditioned.setText(dataList.get(position).getAirconditioned());
        holder.mileage.setText(dataList.get(position).getMileage());
        holder.transmission.setText(dataList.get(position).getTransmission());
        holder.status.setText(dataList.get(position).getStatus());


        Glide.with(context)
            .load(dataList.get(position).getCarimageURL())

            .listener(new RequestListener<String, GlideDrawable>() {
                @Override
                public boolean onException(Exception e, String model, Target<GlideDrawable> target, boolean isFirstResource) {
                    return false;
                }

                @Override
                public boolean onResourceReady(GlideDrawable resource, String model, Target<GlideDrawable> target, boolean isFromMemoryCache, boolean isFirstResource) {
                    holder.progressBar.setVisibility(View.GONE);
                    return false;
                }
            })
            .into(holder.carimage);
            holder.booknow.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    context.startActivity(new Intent(context, CarBookingActivity.class).putExtra("position",position));
                }
            });

     }

    @Override
    public int getItemCount() {
        return dataList.size();
    }


}

xml代码

 <android.support.v7.widget.RecyclerView
    android:id="@+id/carshowrecycler"
    android:layout_below="@id/menu"
    android:layout_width="match_parent"

    android:layout_height="match_parent"


    android:orientation="horizontal"


    app:layoutManager="android.support.v7.widget.LinearLayoutManager"
/>

我已经按照许多答案的解决方案，但没有人帮助过。我一直在研究它持续3-4个小时，并研究了很多关于堆栈溢出的答案，但没有任何帮助请帮帮我！

活动代码

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
tools:context="belllab.naseem.tourism.Activities.RentACarActivity">

<LinearLayout
    android:id="@+id/menu"
    android:layout_width="match_parent"
    android:layout_height="50dp"

    android:orientation="horizontal">

    <RelativeLayout
        android:id="@+id/locallayout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:orientation="vertical">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:layout_marginTop="10dp"
            android:id="@+id/localairporttext"
            android:text=" Local/Airport Pick / Drop"
            android:textAlignment="center"
            android:textColor="@color/black"
            android:textSize="15sp"
            android:textStyle="bold" />

        <View
            android:id="@+id/localairportview"
            android:layout_width="match_parent"
            android:layout_height="2dp"
            android:layout_alignParentBottom="true"
            android:layout_marginLeft="5dp"
            android:layout_marginRight="5dp"
            android:layout_marginTop="5dp"
            android:background="#7e7c7c" />
    </RelativeLayout>

    <RelativeLayout
        android:id="@+id/outstationlayout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:orientation="vertical">

        <TextView
            android:id="@+id/outstationtext"
            android:layout_width="wrap_content"


            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:layout_marginTop="10dp"
            android:text="OutStation"
            android:textColor="@color/black"
            android:textSize="15sp"
            android:textStyle="bold" />

        <View
            android:id="@+id/outstationview"
            android:layout_width="match_parent"
            android:layout_height="2dp"
            android:layout_alignParentBottom="true"
            android:layout_marginLeft="5dp"
            android:layout_marginRight="5dp"
            android:layout_marginTop="5dp"
            android:background="#7e7c7c" />
    </RelativeLayout>

    <RelativeLayout
        android:id="@+id/selflayout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:orientation="vertical">

        <TextView
            android:id="@+id/selfvehicle"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:layout_marginTop="10dp"
            android:text="Self Driven Vehicle"
            android:textAlignment="center"
            android:textColor="@color/black"
            android:textSize="15sp"
            android:textStyle="bold" />

        <View
            android:id="@+id/selfvehicleview"
            android:layout_width="match_parent"
            android:layout_height="2dp"
            android:layout_alignParentBottom="true"
            android:layout_marginLeft="5dp"
            android:layout_marginRight="5dp"
            android:layout_marginTop="5dp"
            android:background="#7e7c7c" />
    </RelativeLayout>

</LinearLayout>

<android.support.v7.widget.RecyclerView
    android:id="@+id/carshowrecycler"
    android:layout_below="@id/menu"
    android:layout_width="match_parent"

    android:layout_height="match_parent"


    android:orientation="horizontal"


    app:layoutManager="android.support.v7.widget.LinearLayoutManager"
/>


  </RelativeLayout>

设置适配器代码

 RentCarRecyclerAdapter adapter =    new RentCarRecyclerAdapter(RentACarActivity.this,list);
                    carsRecyclerView.setAdapter(adapter);

行代码

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 
 xmlns:android="http://schemas.android.com/apk/res/android"
 android:orientation="vertical" android:layout_width="match_parent"
 android:layout_height="match_parent">

    <RelativeLayout
        android:layout_marginRight="20dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">
       <LinearLayout

       android:layout_above="@+id/book"
      android:layout_width="match_parent"
      android:orientation="vertical"
      android:layout_height="match_parent">
      <RelativeLayout
        android:layout_marginLeft="15dp"
        android:layout_marginRight="15dp"
        android:layout_width="match_parent"
        android:layout_height="@dimen/height_for_car">

        <ImageView

        android:layout_width="match_parent"
       android:id="@+id/carpic"
        android:layout_height="match_parent"
      />
        <ProgressBar
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:id="@+id/progress"
            />
      </RelativeLayout>

          <TextView
          android:id="@+id/carname"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:layout_gravity="center"
          android:text="Taxi"
          android:textSize="20sp"
          android:textStyle="bold"

          />

          <View
          android:layout_width="match_parent"
         android:layout_height="1dp"
         android:layout_marginLeft="15dp"
         android:layout_marginRight="15dp"
         android:background="@color/transparentview"
        />
           <RelativeLayout
          android:layout_marginLeft="45dp"
         android:layout_marginRight="45dp"
         android:layout_width="match_parent"
          android:layout_height="wrap_content">
          <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Status"
            android:textSize="15sp"
            android:textStyle="bold"
            android:layout_marginTop="5dp"
            />

        <TextView
            android:layout_marginTop="5dp"
            android:layout_width="wrap_content"
            android:text="availiable"
            android:id="@+id/status"
            android:layout_alignParentRight="true"

            android:textSize="15sp"
            android:textStyle="bold"
            android:layout_gravity="center"
            android:layout_height="wrap_content"

            />
        </RelativeLayout>


         <RelativeLayout
        android:layout_marginLeft="45dp"
        android:layout_marginRight="45dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Price per day"
            android:textSize="15sp"
            android:textStyle="bold"
            android:layout_marginTop="5dp"
            />

        <TextView
            android:layout_marginTop="5dp"
            android:layout_width="wrap_content"
            android:text="RS 7,600"
            android:id="@+id/rentprice"
            android:layout_alignParentRight="true"

            android:textSize="15sp"
            android:textStyle="bold"
            android:layout_gravity="center"
            android:layout_height="wrap_content"

            />
      </RelativeLayout>
      <View
        android:layout_marginTop="5dp"
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:layout_marginLeft="15dp"
        android:layout_marginRight="15dp"
        android:background="@color/transparentview"
        />
        <ScrollView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        >
        <LinearLayout
            android:orientation="vertical"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_marginLeft="45dp"
                android:layout_marginRight="45dp"
                android:layout_height="wrap_content">
                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Max People"
                    android:layout_marginTop="5dp"
                    />

                <TextView

                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"

                    android:id="@+id/maxpeople"
                   android:layout_alignParentRight="true"




                    android:layout_marginTop="5dp"
                    android:text="10" />
            </RelativeLayout>
            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_marginLeft="45dp"
                android:layout_marginRight="45dp"
                android:layout_height="wrap_content">
                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Door Count"
                    android:layout_marginTop="5dp"
                    />

                <TextView

                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"

                    android:id="@+id/doorcount"
                    android:layout_alignParentRight="true"




                    android:layout_marginTop="5dp"
                    android:text="10" />
            </RelativeLayout>
            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_marginLeft="45dp"
                android:layout_marginRight="45dp"
                android:layout_height="wrap_content">
                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Minimum driver age"
                    android:layout_marginTop="5dp"
                    />

                <TextView

                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"

                    android:id="@+id/minimumdriverage"
                    android:layout_alignParentRight="true"




                    android:layout_marginTop="5dp"
                    android:text="10" />
            </RelativeLayout>
            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_marginLeft="45dp"
                android:layout_marginRight="45dp"
                android:layout_height="wrap_content">
                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Transmission"
                    android:layout_marginTop="5dp"
                    />

                <TextView

                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"

                    android:id="@+id/transmission"
                    android:layout_alignParentRight="true"




                    android:layout_marginTop="5dp"
                    android:text="10" />
            </RelativeLayout>
            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_marginLeft="45dp"
                android:layout_marginRight="45dp"
                android:layout_height="wrap_content">
                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Air Conditioned?"
                    android:layout_marginTop="5dp"
                    />

                <TextView

                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"

                    android:layout_alignParentRight="true"
                    android:id="@+id/airconditioned"




                    android:layout_marginTop="5dp"
                    android:text="10" />
            </RelativeLayout>
            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_marginLeft="45dp"
                android:layout_marginRight="45dp"
                android:layout_height="wrap_content">
                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Unlimited mileage?"
                    android:layout_marginTop="5dp"
                    />

                <TextView

                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"

                    android:layout_alignParentRight="true"
                    android:id="@+id/unlimitedmilage"




                    android:layout_marginTop="5dp"
                    android:text="10" />
            </RelativeLayout>


        </LinearLayout>

    </ScrollView>

      </LinearLayout>
         <View
          android:layout_above="@+id/book"
           android:layout_marginBottom="6dp"
          android:layout_width="match_parent"
          android:layout_height="1dp"
          android:layout_marginLeft="15dp"
          android:layout_marginRight="15dp"
         android:background="@color/transparentview"
        />

         <Button


        android:layout_width="140dp"
        android:id="@+id/book"
        android:text="Book Now"
        android:background="@drawable/bookbuttonbackground"
        android:textColor="@color/white"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_height="40dp" />

    </RelativeLayout>
</RelativeLayout>

Answer 1

代码中的问题是代码是你在xml和java代码中都使用布局管理器删除它们中的任何一个任何其次验证你使用设计编译或recylcerview编译gradle而不是两者确保在代码中你没有使recylcerview可见性消失

Answer 2

适配器代码没有问题

从XML app:layoutManager="android.support.v7.widget.LinearLayoutManager"

中删除此行

您需要在此活动中获取recyclelerView

RecyclerView recyclerView = findViewById(R.id.carshowrecycler);
RentCarRecyclerAdapter adapter = new RentCarRecyclerAdapter (this,dataList);

LayoutManager layoutManager = new LinearLayoutManager(getActivity(), LinearLayoutManager.VERTICAL, false);

然后将layoutManager和适配器分配给您的recyclerView

recyclerView.setLayoutManager(layoutManager);
recyclerView.setAdapter(adapter);

Answer 3

对于RecyclerView可能缺少这个：

recyclerView.setLayoutManager(new LinearLayoutManager(runningActivity));

我每次都忘了它并且想知道为什么没有显示任何东西（相同的效果）。

我不知道为什么，但是在将LayoutManager分配给Recylerview之后，它可以正常工作。

没有方法在recylcerview android中调用

3 个答案: