Der Abstand zwischen Kartenansicht ist zu groß

Question

Ich benutze Cardview mit recycler view.Aber früher habe ich den gleichen Code verwendet, um Dinge ohne Probleme zu tun.Aber jetzt verwende ich Fragmente. Jetzt bekomme ich den Abstand zwischen den Kartenansichten größer. meine Recycler Ansicht Adapter

public static class DataObjectHolder extends RecyclerView.ViewHolder implements View.OnClickListener 
    { 
     TextView label; 
     TextView dateTime; 
     ImageView imageView; 
     ProgressBar progressBar; 

     public DataObjectHolder(final View itemView, final Context activity, final ArrayList<DataObject> myDataset) { 
      super(itemView); 
      label = (TextView) itemView.findViewById(R.id.textView); 
      //dateTime = (TextView) itemView.findViewById(R.id.thot); 
      imageView=(ImageView)itemView.findViewById(R.id.iproductimg); 
      progressBar=(ProgressBar)itemView.findViewById(R.id.progress); 
      Log.i(LOG_TAG, "Adding Listener"); 
      itemView.setOnClickListener(this); 

     } 

     @Override 
     public void onClick(View v) { 
      myClickListenerhi.onItemClick(getLayoutPosition(),v); 
     } 
    } 



    public MyRecyclerViewAdapter(Activity context, ArrayList<DataObject> myDataset,MyClickListener myClickListener1) { 
     mDataset = myDataset; 
     activityContext=context; 
     myClickListenerhi=myClickListener1; 
    } 

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

     DataObjectHolder dataObjectHolder = new DataObjectHolder(view,activityContext,mDataset); 
     return dataObjectHolder; 
    } 

    @Override 
    public void onBindViewHolder(final DataObjectHolder holder, int position) { 
     Context context=null; 
     holder.label.setText(mDataset.get(position).getmText1()); 
     // holder.dateTime.setText(mDataset.get(position).getmText2()); 
     Drawable placeholder = holder.imageView.getContext().getResources().getDrawable(R.drawable.placeholder); 
     holder.imageView.setImageDrawable(placeholder); 
     //new ImageDownloaderTask(holder.imageView).execute(mDataset.get(position).getUrl()); 
     mDataset.get(position).setPosition(position); 
      Picasso.with(activityContext) 
       .load(mDataset.get(position).getUrl()) 
       .placeholder(R.drawable.placeholder) 
       .into(holder.imageView, new Callback() { 
        @Override 
        public void onSuccess() { 
         holder.progressBar.setVisibility(View.INVISIBLE); 
        } 

        @Override 
        public void onError() { 
        } 
       }); 
    } 

    public void addItem(DataObject dataObj, int index) { 
     mDataset.add(index, dataObj); 
     notifyItemInserted(index); 
    } 

    public void deleteItem(int index) { 
     mDataset.remove(index); 
     notifyItemRemoved(index); 
    } 

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

    public interface MyClickListener { 
     void onItemClick(int position, View v); 
    } 

} 

mein cardview

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:card_view="http://schemas.android.com/apk/res-auto" 
    android:orientation="horizontal" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:weightSum="3" 
    > 

    <android.support.v7.widget.CardView 
     android:id="@+id/card_view" 
     android:layout_width="156dp" 
     android:layout_height="242dp" 
     android:layout_margin="5dp" 
     card_view:cardCornerRadius="2dp" 
     card_view:contentPadding="5dp" 
     card_view:cardBackgroundColor="#ffffff"> 

     <RelativeLayout 
      android:layout_width="fill_parent" 
      android:layout_height="fill_parent"> 

      <ImageView 
       android:layout_width="wrap_content" 
       android:layout_height="200dp" 
       android:id="@+id/iproductimg" 
       android:src="@drawable/placeholder" 
       android:layout_alignParentTop="true" 
       android:layout_alignParentLeft="true" 
       android:layout_alignParentStart="true" 
       android:scaleType="fitXY" /> 
      <ProgressBar 
       android:id="@+id/progress" 
       style="?android:attr/progressBarStyleSmall" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:layout_centerInParent="true" 
       android:visibility="visible" 
       android:indeterminate="false" /> 
      <TextView 
       android:id="@+id/textView" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:textStyle="bold" 
       android:layout_alignParentBottom="true" 
       android:layout_alignParentLeft="true" 
       android:layout_alignParentStart="true" /> 

      <TextView 
       android:id="@+id/firstheadtxt" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:textStyle="bold" 
       android:layout_below="@+id/textView" 
       android:layout_alignParentLeft="true" 
       android:layout_alignParentStart="true" /> 

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


</LinearLayout> 

Der Fehler

Answer 1

Ich löste dies durch CardviewLinearLayout Attribut aus

Ändern

android:layout_width="match_parent" 
android:layout_height="match_parent" 

zu

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

Edit: Haupt Problem ist, dass die Recyclerviews Kind Layout oder Element Layout Rootview Attribut ist match_parent .eg: wenn Ihr Kind Layout ist auf LineareLayout gebaut (sagen).

Änderung es wrap_content

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

Answer 2

In diesem Fall: im Layout cardview:

entfernen: layout_margin="5dp"

hinzufügen:

margin_top = "3dp" 
margin_left = "5dp" 
margin_right = "5dp"