CardView 设置其中一个圆角的大小（自定义其中一个圆角的大小）(设置指定圆角大小)

 

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：

使用方法：

 

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;

/**
 * Created by jingzz on 2020/3/20.
 */
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：