我正在为 LinearLayouts 背景使用 ShapeDrawable。形状是由 cod 制作的，因为我需要根据条件动态地为它们分配颜色。 这是我的自定义形状

public class CustomShapeDrawable extends ShapeDrawable {
    private final Paint fillpaint, strokepaint, linePaint = new Paint();
    private int strokeWidth = 3;
    private final boolean disableBottomBorder;

    public CustomShapeDrawable(Shape s, int fill, int stroke, int strokewidth, boolean disablebottomborder) {
        super(s);
        fillpaint = new Paint(this.getPaint());
        fillpaint.setColor(fill);
        strokepaint = new Paint(fillpaint);
        strokepaint.setStyle(Paint.Style.STROKE);
        strokepaint.setStrokeWidth(strokewidth);
        strokepaint.setColor(stroke);
        linePaint.setStyle(Paint.Style.STROKE);
        linePaint.setStrokeWidth(strokewidth + 1);
        linePaint.setColor(fill);
        strokeWidth = strokewidth;
        disableBottomBorder = disablebottomborder;

    }

    public CustomShapeDrawable(Shape s, int fill, int stroke, boolean disablebottomborder) {
        super(s);
        fillpaint = new Paint(this.getPaint());
        fillpaint.setColor(fill);
        strokepaint = new Paint(fillpaint);
        strokepaint.setStyle(Paint.Style.STROKE);
        strokepaint.setStrokeWidth(strokeWidth);
        strokepaint.setColor(stroke);
        linePaint.setStyle(Paint.Style.STROKE);
        linePaint.setStrokeWidth(strokeWidth + 1);
        linePaint.setColor(fill);
        disableBottomBorder = disablebottomborder;
    }

    @Override
    protected void onDraw(Shape shape, Canvas canvas, Paint paint) {
        shape.resize(canvas.getClipBounds().right, canvas.getClipBounds().bottom);
        shape.draw(canvas, fillpaint);

        Matrix matrix = new Matrix();
        matrix.setRectToRect(new RectF(0, 0, canvas.getClipBounds().right, canvas.getClipBounds().bottom), new RectF(strokeWidth / 2, strokeWidth / 2, canvas.getClipBounds().right - strokeWidth / 2,
                canvas.getClipBounds().bottom - strokeWidth / 2), Matrix.ScaleToFit.FILL);
        canvas.concat(matrix);

        shape.draw(canvas, strokepaint);

        if (disableBottomBorder) {
            canvas.drawLine(0 + strokeWidth/2, shape.getHeight(), shape.getWidth() - strokeWidth/2, shape.getHeight(), linePaint);
        }
    }

此 CustomShapeDrawable 用作我的布局的 StateListDrawable，如下所示:

        RoundRectShape shapeTopCorners = new RoundRectShape(new float[] { 10, 10, 10, 10, 0, 0, 0, 0 }, null, null);
        ShapeDrawable shapeTopCornersNormal =
                new CustomShapeDrawable(shapeTopCorners, Global.getFleet().getSkins().getBackgroundcolour(), context.getResources().getColor(R.color.item_line), true);
        ShapeDrawable shapeTopCornersPressed =
                new CustomShapeDrawable(shapeTopCorners, context.getResources().getColor(R.color.menu_grey), context.getResources().getColor(R.color.item_line), true);

        StateListDrawable stateTopCornersRounded = new StateListDrawable();
        stateTopCornersRounded.addState(new int[] { android.R.attr.state_focused }, shapeTopCornersPressed);
        stateTopCornersRounded.addState(new int[] { android.R.attr.state_pressed }, shapeTopCornersPressed);
        stateTopCornersRounded.addState(new int[] {}, shapeTopCornersNormal);

一切看起来都很好，布局与我想要的颜色具有相同的形状。当我在屏幕上看到另一个元素(如键盘或 AlertDialog)时，丑陋的事情就发生了。当我的应用程序再次获得焦点时，布局因随机线条和伪影而变得疯狂。 这就是我的意思:

我该怎么做才能防止或修复这些看起来很丑陋的瑕疵。我不知道为什么首先会发生这种情况。感谢您为我提供的任何帮助。

最佳答案

没有任何建议，目前唯一能解决问题的是: - 我在我的 Activity 中创建了一个名为 invalidate() 的方法，其中对于我想要刷新的所有布局，我添加了 layoutId.invalidate() - 每当显示警告对话框时，调用 invalidate() - 对于所有 EditTexts onFocusChanged 或 onTextChanged，调用 invalidate()

这不是一个完全符合人体工程学的解决方案，但它现在似乎可以工作。

关于android - Android 中 ShapeDrawable 的恼人行为，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/10330509/