更改 RecyclerView 项目宽度？

Question

我知道那里可能有一个非常简单的解决方案，但我似乎无法找到它。如何更改 RecycleView 项目的宽度？出于某种原因，它显示父项的第一个全宽...它在每个项目之间显示很多白色 space。

<LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/main_wrapper"
        android:background="@color/colorPrimary"
        android:orientation="vertical">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="0.2"
            android:padding="20dp"
            android:orientation="vertical">

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Categories"
                android:textColor="#ffffff"
                android:layout_marginBottom="10dp"/>

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

        </LinearLayout>
</LinearLayout>

类别适配器：

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

private ArrayList<Category> categories;

public CategoryAdapter(ArrayList<Category> categories) {
    this.categories = categories;
}

@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.single_cat, parent, false);
    return new ViewHolder(v);
}

@Override public void onBindViewHolder(ViewHolder holder, int position) {
    Category cat = this.categories.get(position);
    holder.text.setText(cat.getText().toString());
}

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

public static class ViewHolder extends RecyclerView.ViewHolder {
    public TextView text;

    public ViewHolder(View itemView) {
        super(itemView);
        text = (TextView) itemView.findViewById(R.id.cat_title);
    }
}

}

single_cat.xml

<TextView
    android:layout_width="100dp"
    android:layout_height="40dp"
    android:text="Cat"
    android:background="@drawable/cat_single_shape"
    android:padding="10dp"
    android:gravity="center"
    android:id="@+id/cat_title"
    android:textSize="13sp"
    android:fontFamily="@font/open_sans_bold"
    android:textColor="@color/colorPrimary"/>

Answer 1

我会把单只猫改成

<TextView
android:layout_width="match_parent"
android:layout_height="40dp"
android:background="@drawable/cat_single_shape"
android:padding="10dp"
android:gravity="center"
android:id="@+id/cat_title"
android:textSize="13sp"
android:fontFamily="@font/open_sans_bold"
android:textColor="@color/colorPrimary"/>

Answer 2

1) 在你的片段中做：

recyclerView.setLayoutManager(new LinearLayoutManager(getContext(), RecyclerView.HORIZONTAL, true));

2) 对于 recyclerView 单个项目。xml 做：

<?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="100dp"

android:layout_height="50dp"

android:layout_margin="4dp">


<TextView

android:layout_width="match_parent"

android:layout_height="match_parent"

android:gravity="center" />

</LinearLayout>

3) 并将 RecyclerView 更改为：

<LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/main_wrapper"
        android:background="@color/colorPrimary"
        android:orientation="vertical">


            <TextView
                android:layout_width="wrap_content"
                android:layout_height="0dp"
                android:layout_weight="0.2"
                android:text="Categories"
                android:textColor="#ffffff"
                android:layout_marginBottom="10dp"/>

            <android.support.v7.widget.RecyclerView
                android:layout_width="match_parent"
                android:layout_height="0dp"
                android:layout_weight="0.8"
                android:id="@+id/cats"/>

</LinearLayout>

Answer 3

终于在网上找了2天，自己搞定了。

确保您的约束布局是wrap_content。这一直是个问题！

更改 RecyclerView 项目宽度？

Change RecycleView item width?

android

adapter