Java 自定义底部导航视图

我使用OpenCV开发了一个android应用程序。用户界面具有底部导航视图。当我在底部导航视图中按下items时，它会对JavaCameraView实时应用不同的过滤器

我的问题是底部导航看起来很平坦。我想使按钮之类的项目从其位置升高，这样它们就不会与用户界面的其余部分位于同一平面

我知道底片，但那对我没有帮助。我已经完全开发了这个应用程序，并完成了设计。我不能使用除底部导航视图以外的任何视图

在BottomNavigationView对象上是否有任何XML属性或方法可用于将项目从其位置提升

导航视图：

项目代码：

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使用自定义类，我们可以在弧形底部导航视图中绘制弧形自定义形状。通过使用下面的XML

<android.tutorial.curvedbottombar.CurvedBottomNavigationView
            android:id="@+id/customBottomBar"
            android:layout_width="match_parent"
            android:layout_height="62dp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent" />

您可以从下载完整的源代码

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由于菜单项不支持提升，您可以设计图标，并提供android UI指南中提到的一些高光和阴影，使它们看起来有点高。有关如何设计菜单图标，请参阅本和ID指南

检查此图像以了解情况。

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请提供一些代码

这是导航视图的代码

这是项目代码我想让项目从屏幕中弹出。。或者换句话说，我想让项目看起来像按钮。

public class CurvedBottomNavigationView extends BottomNavigationView {
    private Path mPath;
    private Paint mPaint;


    /** the CURVE_CIRCLE_RADIUS represent the radius of the fab button */
    public final int CURVE_CIRCLE_RADIUS = 256 / 3;
    // the coordinates of the first curve
    public Point mFirstCurveStartPoint = new Point();
    public Point mFirstCurveEndPoint = new Point();
    public Point mFirstCurveControlPoint2 = new Point();
    public Point mFirstCurveControlPoint1 = new Point();

    //the coordinates of the second curve
    @SuppressWarnings("FieldCanBeLocal")
    public Point mSecondCurveStartPoint = new Point();
    public Point mSecondCurveEndPoint = new Point();
    public Point mSecondCurveControlPoint1 = new Point();
    public Point mSecondCurveControlPoint2 = new Point();
    public int mNavigationBarWidth;
    public int mNavigationBarHeight;

    public CurvedBottomNavigationView(Context context) {
        super(context);
        init();
    }

    public CurvedBottomNavigationView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public CurvedBottomNavigationView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    private void init() {
        mPath = new Path();
        mPaint = new Paint();
        mPaint.setStyle(Paint.Style.FILL_AND_STROKE);
        mPaint.setColor(Color.WHITE);
        setBackgroundColor(Color.TRANSPARENT);
    }

    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
        super.onLayout(changed, left, top, right, bottom);

    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        // get width and height of navigation bar
        // Navigation bar bounds (width & height)
         mNavigationBarWidth = getWidth();
         mNavigationBarHeight = getHeight();
        // the coordinates (x,y) of the start point before curve
        mFirstCurveStartPoint.set((mNavigationBarWidth / 2) - (CURVE_CIRCLE_RADIUS * 2) - (CURVE_CIRCLE_RADIUS / 3), 0);
        // the coordinates (x,y) of the end point after curve
        mFirstCurveEndPoint.set(mNavigationBarWidth / 2, CURVE_CIRCLE_RADIUS + (CURVE_CIRCLE_RADIUS / 4));
        // same thing for the second curve
        mSecondCurveStartPoint = mFirstCurveEndPoint;
        mSecondCurveEndPoint.set((mNavigationBarWidth / 2) + (CURVE_CIRCLE_RADIUS * 2) + (CURVE_CIRCLE_RADIUS / 3), 0);

        // the coordinates (x,y)  of the 1st control point on a cubic curve
        mFirstCurveControlPoint1.set(mFirstCurveStartPoint.x + CURVE_CIRCLE_RADIUS + (CURVE_CIRCLE_RADIUS / 4), mFirstCurveStartPoint.y);
        // the coordinates (x,y)  of the 2nd control point on a cubic curve
        mFirstCurveControlPoint2.set(mFirstCurveEndPoint.x - (CURVE_CIRCLE_RADIUS * 2) + CURVE_CIRCLE_RADIUS, mFirstCurveEndPoint.y);

        mSecondCurveControlPoint1.set(mSecondCurveStartPoint.x + (CURVE_CIRCLE_RADIUS * 2) - CURVE_CIRCLE_RADIUS, mSecondCurveStartPoint.y);
        mSecondCurveControlPoint2.set(mSecondCurveEndPoint.x - (CURVE_CIRCLE_RADIUS + (CURVE_CIRCLE_RADIUS / 4)), mSecondCurveEndPoint.y);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        mPath.reset();
        mPath.moveTo(0, 0);
        mPath.lineTo(mFirstCurveStartPoint.x, mFirstCurveStartPoint.y);

        mPath.cubicTo(mFirstCurveControlPoint1.x, mFirstCurveControlPoint1.y,
                mFirstCurveControlPoint2.x, mFirstCurveControlPoint2.y,
                mFirstCurveEndPoint.x, mFirstCurveEndPoint.y);

        mPath.cubicTo(mSecondCurveControlPoint1.x, mSecondCurveControlPoint1.y,
                mSecondCurveControlPoint2.x, mSecondCurveControlPoint2.y,
                mSecondCurveEndPoint.x, mSecondCurveEndPoint.y);

        mPath.lineTo(mNavigationBarWidth, 0);
        mPath.lineTo(mNavigationBarWidth, mNavigationBarHeight);
        mPath.lineTo(0, mNavigationBarHeight);
        mPath.close();

        canvas.drawPath(mPath, mPaint);
    }
}