切割布局的角落

Question

我在android中有一个需要某种形状的布局，即：

切角处。有没有办法以编程方式执行此操作而无需将布局背景设置为图像？ 我希望尽可能减小应用尺寸，因此必须尽量减少应用中的可绘制数量。

Answer 1

import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.drawable.shapes.Shape;

public class WeirdShape extends Shape {
    private static final int    COLOUR       = Color.BLACK;
    private static final float  STROKE_WIDTH = 1.0f;
    private static final float  CORNER = 35.0f;

    private final Paint border = new Paint();
    private final Path  path;  

    public WeirdShape() {
       path   = new Path();

        border.setColor      (COLOUR);
        border.setStyle      (Paint.Style.FILL);
        border.setStrokeWidth(STROKE_WIDTH);
        border.setAntiAlias  (true);
        border.setDither     (true);
        border.setStrokeJoin (Paint.Join.ROUND);  
        border.setStrokeCap  (Paint.Cap.ROUND);  
    }

    @Override
    protected void onResize(float width, float height) {
        super.onResize(width, height);

        float dx = STROKE_WIDTH/2.0f;
        float dy = STROKE_WIDTH/2.0f;
        float x  = dx;
        float y  = dy;
        float w  = width  - dx;
        float h  = height - dy;

        //RectF arc = new RectF(x,h-2*CORNER,x+2*CORNER,h);

        path.reset();
        path.moveTo(x + CORNER,y);
        path.lineTo(w - CORNER,y);
        path.lineTo(w,y + CORNER);
        path.lineTo(w, h);
        path.lineTo(x + CORNER,h);
       // path.arcTo (arc,90.0f,90.0f);
        path.lineTo(dx,h - CORNER);
        path.lineTo(dx,y);//path.lineTo(dx,y + CORNER);
        path.close();
    }


    @Override
    public void draw(Canvas canvas, Paint paint) {
        // TODO Auto-generated method stub
        canvas.drawPath(path,border);
    }
}

然后使用ShapeDrawable中的自定义Shape作为背景Drawable：

view.setBackground(new ShapeDrawable(new WeirdShape()));

看起来像：

Answer 2

您可以使用材料组件库提供的 function func(x, n) { if (n == 1) { return x; } else { let function_returned = func(x, n - 1); console.log(x, "*", function_returned, "=", x*function_returned) return x * function_returned } } console.log(func(2, 4)); ：

ShapeAppearanceModel

具有：

    <LinearLayout
        android:id="@+id/layout"
        ..>