Java LinearLayout addview（）禁用第一个子项上的边距

我在将视图动态添加到

LinearLayout

时遇到问题。 我正试图从

xml

中为CardView充气。我添加了4个

cardwiew

s，每个视图都可以，除了第一个没有边距。我不知道为什么。 （下图）

MainActivity.java

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        setTitle("Select Sale");

        ShowSales(getSales());
    }

    private void ShowSales(Sale[] sales) {
        LinearLayout sale_layout = (LinearLayout) findViewById(R.id.sale_layout);
        for (Sale sale : sales) {
            CardView saleCard = (CardView) getLayoutInflater().inflate(R.layout.sale_card, (ViewGroup) findViewById(R.id.sale_card), false);
            ((TextView) saleCard.findViewById(R.id.sale_name)).setText(sale.name);
            ((TextView) saleCard.findViewById(R.id.sale_desc)).setText(sale.desc);
            ((TextView) saleCard.findViewById(R.id.sale_price)).setText(sale.price + getString(R.string.dollar));
            sale_layout.addView(saleCard);
        }
    }

    //temp method to get sales - in future will get sales from server
    private Sale[] getSales() {
        return new Sale[]{
                new Sale("Sale number 1", "desc desc desc desc", 14.90),
                new Sale("Sale number 2", "desc desc desc desc", 19.90),
                new Sale("Sale number 3", "desc desc desc desc", 25.90),
                new Sale("Sale number 4", "desc desc desc desc", 17.90),
        };
    }

    class Sale {
        String name, desc;
        double price;

        public Sale(String name, String desc, double price) {
            this.name = name;
            this.desc = desc;
            this.price = price;
        }
    }
}

活动\u main.xml

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

    <LinearLayout xmlns:app="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <LinearLayout
            android:id="@+id/sale_layout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="16dp"
            android:orientation="vertical" />

        <ImageButton
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="@android:color/transparent"
            android:clickable="true"
            android:src="@mipmap/ic_launcher" />
    </LinearLayout>
</ScrollView>

sale_card.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/sale_card"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="16dp"
    android:clickable="true"
    android:foreground="?attr/selectableItemBackground"
    app:cardCornerRadius="@dimen/cardview_default_radius">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:padding="8dp">

        <TextView
            android:id="@+id/sale_name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentStart="true"
            android:layout_margin="8dp"
            android:text="Sale name"
            android:textSize="27sp" />

        <TextView
            android:id="@+id/sale_desc"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentStart="true"
            android:layout_below="@id/sale_name"
            android:text="this is description of the sale" />

        <TextView
            android:id="@+id/sale_price"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentEnd="true"
            android:layout_alignParentTop="true"
            android:text="100&#36;"
            android:textSize="23sp"
            android:textStyle="bold" />
    </RelativeLayout>
</android.support.v7.widget.CardView>

而不是：

CardView saleCard = (CardView) getLayoutInflater()
    .inflate(R.layout.sale_card, (ViewGroup) findViewById(R.id.sale_card), false);

执行：

CardView saleCard = (CardView) getLayoutInflater()
    .inflate(R.layout.sale_card, sale_layout, false);

修复它的Thx:）