带圆角的CornerConstraintLayout_constraintlayout代码加圆角

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.RectF;
import android.util.AttributeSet;
 
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.constraintlayout.widget.ConstraintLayout;
 
import com.blankj.utilcode.util.ConvertUtils;
import com.hanvonscanner.common.R;
 
public class CornerConstraintLayout extends ConstraintLayout {
    private static final float RADIUS_DEFAULT = -1f;
    private Paint mPaint;
    private float mRadius;
    private float mTopLeftRadius, mTopRightRadius, mBottomLeftRadius, mBottomRightRadius;
    private float[] corners;
 
    public CornerConstraintLayout(@NonNull Context context) {
        this(context, null);
    }
 
    public CornerConstraintLayout(@NonNull Context context, @Nullable AttributeSet attrs) {
        this(context, attrs, 0);
    }
 
    public CornerConstraintLayout(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
 
        TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.CornerConstraintLayout);
        mRadius = typedArray.getDimension(R.styleable.CornerConstraintLayout_android_radius, RADIUS_DEFAULT);
        mTopLeftRadius = typedArray.getDimension(R.styleable.CornerConstraintLayout_android_topLeftRadius, RADIUS_DEFAULT);
        mTopRightRadius = typedArray.getDimension(R.styleable.CornerConstraintLayout_android_topRightRadius, RADIUS_DEFAULT);
        mBottomLeftRadius = typedArray.getDimension(R.styleable.CornerConstraintLayout_android_bottomLeftRadius, RADIUS_DEFAULT);
        mBottomRightRadius = typedArray.getDimension(R.styleable.CornerConstraintLayout_android_bottomRightRadius, RADIUS_DEFAULT);
        typedArray.recycle();
 
 
        mPaint = new Paint();
        mPaint.setAntiAlias(true);
 
        if (mRadius <= RADIUS_DEFAULT){
            mRadius = 0;
        }
        corners = new float[]{
                mRadius, mRadius,        // Top left radius in px
                mRadius, mRadius,        // Top right radius in px
                mRadius, mRadius,          // Bottom right radius in px
                mRadius, mRadius,           // Bottom left radius in px
        };
 
        if (mTopLeftRadius > RADIUS_DEFAULT){
            corners[0] = mTopLeftRadius;
            corners[1] = mTopLeftRadius;
        }
        if (mTopRightRadius > RADIUS_DEFAULT){
            corners[2] = mTopRightRadius;
            corners[3] = mTopRightRadius;
        }
        if (mBottomRightRadius > RADIUS_DEFAULT){
            corners[4] = mBottomRightRadius;
            corners[5] = mBottomRightRadius;
        }
 
        if (mBottomLeftRadius > RADIUS_DEFAULT){
            corners[6] = mBottomLeftRadius;
            corners[7] = mBottomLeftRadius;
        }
    }
 
    @Override
    protected void onDraw(Canvas canvas) {
        RectF rect = new RectF(0, 0, getWidth(), getHeight());
        Path path = new Path();
        path.addRoundRect(rect, corners, Path.Direction.CW);
        canvas.clipPath(path);
    }
}

自定义属性：

 <declare-styleable name="CornerConstraintLayout">
        <attr name="android:radius" />
        <!-- Radius of the top left corner. -->
        <attr name="android:topLeftRadius" />
        <!-- Radius of the top right corner. -->
        <attr name="android:topRightRadius" />
        <!-- Radius of the bottom left corner. -->
        <attr name="android:bottomLeftRadius" />
        <!-- Radius of the bottom right corner. -->
        <attr name="android:bottomRightRadius" />
    </declare-styleable>