如何獲得內部RecyclerView

Question

CardView的寬度因此，這裏是我的RecyclerView的XML

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

    <android.support.v7.widget.RecyclerView 
     android:id="@+id/bikename_recycler" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" /> 

</LinearLayout> 

下面是由RecyclerView的適配器充氣佈局。

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

    <android.support.v7.widget.CardView 
     xmlns:card_view="http://schemas.android.com/apk/res-auto" 
     android:id="@+id/bikenames_cardview" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" > 

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

      <ImageView 
       android:id="@+id/bikenames_imageview" 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" /> 

      <TextView 
       android:id="@+id/bikenames_name" 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" /> 
    </android.support.v7.widget.CardView> 

</LinearLayout> 

所以在這裏我需要找到CardView的寬度（@ ID/bikenames_cardview）在我的活動或RecyclerView適配器。我也寫過RecyclerView適配器。

適配器代碼

public class BikeNamesAdapter extends RecyclerView.Adapter<BikeNamesViewHolder> { 

    BikeNames bikeNames; 
    Context context; 

    public BikeNamesAdapter(BikeNames bikeNames) { 
     this.bikeNames = bikeNames; 
    } 

    @Override 
    public int getItemCount() { 
     return bikeNames.getLength(); 
    } 

    @Override 
    public BikeNamesViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 
     context = parent.getContext(); 
     View view = LayoutInflater.from(context).inflate(R.layout.cardview_bike_names, parent, false); 
     return new BikeNamesViewHolder(view); 
    } 

    @Override 
    public void onBindViewHolder(BikeNamesViewHolder holder, int position) { 
     holder.textViewBikeName.setText(bikeNames.getBikeNameByIndex(position)); 

    } 

} 

我可能會跳過一些代碼，在這裏減少的長度。

Answer 1

設置監聽到您的視圖中onCreateViewHolder

ViewTreeObserver viewTreeObserver = view.getViewTreeObserver(); 
if (viewTreeObserver.isAlive()) { 
    viewTreeObserver.addOnGlobalLayoutListener(new OnGlobalLayoutListener() { 
    @Override 
    public void onGlobalLayout() { 
     view.getViewTreeObserver().removeOnGlobalLayoutListener(this); 
     viewWidth = view.getWidth(); 
     viewHeight = view.getHeight(); 
    } 
    }); 
} 

還要檢查這個和this問題。