android: 按钮圆角效果

一，代码：

rouned_corner.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <corners android:radius="10dp" />
    <solid android:color="#006400" />
</shape>

说明：radius="10dp"表示圆角的像素数量

调用:

    <Button android:text="+"
        android:id="@+id/btn_jia"
        android:layout_height="wrap_content"
        android:layout_width="0dp"
        android:layout_marginEnd="5dp"
        android:background="@drawable/rounded_corner"
        android:textColor="#ffffff"
        android:layout_marginTop="5dp"
        app:layout_constraintHorizontal_weight="1"
        app:layout_constraintTop_toBottomOf="@id/btn_ht"
        app:layout_constraintStart_toStartOf="@id/btn_ht"
        app:layout_constraintEnd_toStartOf="@id/btn_01"
        />
    <Button android:text="1"
        android:id="@+id/btn_01"
        android:layout_height="wrap_content"
        android:layout_width="0dp"
        android:layout_marginEnd="5dp"
        android:layout_marginStart="5dp"
        android:layout_marginTop="5dp"
        android:background="@drawable/rounded_corner"
        android:textColor="#ffffff"
        app:layout_constraintHorizontal_weight="1"
        app:layout_constraintTop_toBottomOf="@id/btn_ht"
        app:layout_constraintStart_toEndOf="@id/btn_jia"
        app:layout_constraintEnd_toStartOf="@id/btn_02"
        />

二，测试效果: