注意：material:1.1.0以上版本在RadiusCardView节点下一定要添加 android:theme=“@style/Theme.MaterialComponents”，不然会报错，另外，由于是重写自MaterialCardView，所以一定要导入material包：

 implementation 'com.google.android.material:material:1.1.0'

样式：

源码：

RadiusCardView

import android.graphics.Path;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.Region;
import android.graphics.drawable.ColorDrawable;
import android.util.AttributeSet;
 
import com.google.android.material.card.MaterialCardView;
import com.seocoo.user.R;
 
public class RadiusCardView extends MaterialCardView {
    private float tlRadiu;
    private float trRadiu;
    private float brRadiu;
    private float blRadiu;
 
    public RadiusCardView(Context context) {
        this(context, null);
    }
 
    public RadiusCardView(Context context, AttributeSet attrs) {
        this(context, attrs, R.attr.materialCardViewStyle);
    }
 
    public RadiusCardView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        setRadius(0);
        TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.RadiusCardView);
        tlRadiu = array.getDimension(R.styleable.RadiusCardView_rcv_topLeftRadiu, 0);
        trRadiu = array.getDimension(R.styleable.RadiusCardView_rcv_topRightRadiu, 0);
        brRadiu = array.getDimension(R.styleable.RadiusCardView_rcv_bottomRightRadiu, 0);
        blRadiu = array.getDimension(R.styleable.RadiusCardView_rcv_bottomLeftRadiu, 0);
        setBackground(new ColorDrawable());
    }
 
    @Override
    protected void onDraw(Canvas canvas) {
        Path path = new Path();
        RectF rectF = getRectF();
        float[] readius = {tlRadiu,tlRadiu,trRadiu,trRadiu,brRadiu,brRadiu,blRadiu,blRadiu};
        path.addRoundRect(rectF,readius,Path.Direction.CW);
        canvas.clipPath(path,Region.Op.INTERSECT);
        super.onDraw(canvas);
    }
 
    private RectF getRectF() {
        Rect rect = new Rect();
        getDrawingRect(rect);
        RectF rectF = new RectF(rect);
        return rectF;
    }
}

attr文件：

    <declare-styleable name="RadiusCardView">
        <!--        左上圆角大小-->
        <attr name="rcv_topLeftRadiu" format="dimension" />
        <!--        右上圆角大小-->
        <attr name="rcv_topRightRadiu" format="dimension" />
        <!--        右下圆角大小-->
        <attr name="rcv_bottomRightRadiu" format="dimension" />
        <!--        左下圆角大小-->
        <attr name="rcv_bottomLeftRadiu" format="dimension" />
    </declare-styleable>

使用案例：

    <RadiusCardView所在路径.RadiusCardView
        android:layout_width="match_parent"
        android:layout_height="200dp"
        android:theme="@style/Theme.MaterialComponents" //这行一定要添加，不然会报错
        app:rcv_topLeftRadiu="20dp"
        app:rcv_topRightRadiu="40dp"
        app:rcv_bottomLeftRadiu="10dp"
        app:rcv_bottomRightRadiu="60dp">
 
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical">
            <View
                android:layout_width="match_parent"
                android:layout_height="0dp"
                android:layout_weight="2"
                android:background="@color/color295C8E"/>
 
            <View
                android:layout_width="match_parent"
                android:layout_height="0dp"
                android:layout_weight="1"
                android:background="@color/color9E7900"/>
 
        </LinearLayout>
 
    </RadiusCardView所在路径.RadiusCardView>