要解决Android TabLayout指示符的绘制颜色不可见，并且无法添加自定义宽度的问题，您可以使用自定义的TabLayout指示符来实现。

1. 创建一个自定义的TabLayout指示符绘制类，继承自TabLayout.TabIndicatorInterpolator。例如，创建一个名为CustomTabLayoutIndicator的类。

public class CustomTabLayoutIndicator implements TabLayout.TabIndicatorInterpolator {
    private final Paint paint;
    private final int color;
    private final int width;

    public CustomTabLayoutIndicator(int color, int width) {
        this.color = color;
        this.width = width;
        this.paint = new Paint();
        this.paint.setColor(color);
        this.paint.setStrokeWidth(width);
        this.paint.setStyle(Paint.Style.FILL_AND_STROKE);
    }

    @Override
    public void draw(Canvas canvas, int startX, int stopX, int startY, int stopY, int selectedPosition, float selectionOffset) {
        float indicatorStartX = startX + width / 2;
        float indicatorStopX = stopX - width / 2;
        float indicatorY = startY + (stopY - startY) * (selectedPosition + selectionOffset);
        canvas.drawLine(indicatorStartX, indicatorY, indicatorStopX, indicatorY, paint);
    }
}

2. 在您的Activity或Fragment中，找到TabLayout并设置自定义的TabLayout指示符绘制类。

TabLayout tabLayout = findViewById(R.id.tab_layout);
CustomTabLayoutIndicator customTabLayoutIndicator = new CustomTabLayoutIndicator(ContextCompat.getColor(this, R.color.indicator_color), getResources().getDimensionPixelSize(R.dimen.indicator_width));
tabLayout.setSelectedTabIndicator(customTabLayoutIndicator);

请确保将颜色资源和尺寸资源替换为您自己的颜色和宽度值。

通过使用自定义的TabLayout指示符绘制类，您可以在TabLayout中绘制自定义的指示符，并设置颜色和宽度，以满足您的需求。