TouchMarginView

public interface TouchMarginView {
    void setTouchMargin(int left, int top, int right, int bottom);

    void setTouchMarginLeft(int margin);

    void setTouchMarginTop(int margin);

    void setTouchMarginRight(int margin);

    void setTouchMarginBottom(int margin);

    Rect getTouchMargin();
}

Implementation

    private Rect touchMargin;

    @Override
    public void setTouchMargin(int left, int top, int right, int bottom) {
        touchMargin = new Rect(left, top, right, bottom);
    }

    @Override
    public void setTouchMarginLeft(int margin) {
        touchMargin.left = margin;
    }

    @Override
    public void setTouchMarginTop(int margin) {
        touchMargin.top = margin;
    }

    @Override
    public void setTouchMarginRight(int margin) {
        touchMargin.right = margin;
    }

    @Override
    public void setTouchMarginBottom(int margin) {
        touchMargin.bottom = margin;
    }

    @Override
    public Rect getTouchMargin() {
        return touchMargin;
    }

    public void getHitRect(Rect outRect) {
        if (touchMargin == null) {
            super.getHitRect(outRect);
            return;
        }
        outRect.set(getLeft() - touchMargin.left, getTop() - touchMargin.top, getRight() + touchMargin.right, getBottom() + touchMargin.bottom);
    }