在MPAndroidChart BarChart中添加图像？

public class CustomBarChartRenderer extends BarChartRenderer {

    private Drawable image; // 图像资源

    public CustomBarChartRenderer(BarDataProvider chart, ChartAnimator animator, ViewPortHandler viewPortHandler) {
        super(chart, animator, viewPortHandler);
    }

    public void setImage(Drawable image) {
        this.image = image;
    }

    @Override
    public void drawDataSet(Canvas c, IBarDataSet dataSet, int index) {
        super.drawDataSet(c, dataSet, index);

        if (image != null) {
            BarBuffer buffer = mBarBuffers[index];

            for (int j = 0; j < buffer.buffer.length * mAnimator.getPhaseX(); j += 4) {
                float left = buffer.buffer[j];
                float top = buffer.buffer[j + 1];
                float right = buffer.buffer[j + 2];
                float bottom = buffer.buffer[j + 3];

                float x = (left + right) / 2f;
                float y = bottom;

                image.setBounds((int) (x - image.getIntrinsicWidth() / 2),
                        (int) (y - image.getIntrinsicHeight()),
                        (int) (x + image.getIntrinsicWidth() / 2),
                        (int) y);
                image.draw(c);
            }
        }
    }
}

BarChart barChart = findViewById(R.id.barChart);

CustomBarChartRenderer customRenderer = new CustomBarChartRenderer(barChart, barChart.getAnimator(), barChart.getViewPortHandler());
barChart.setRenderer(customRenderer);

Drawable image = getResources().getDrawable(R.drawable.your_image);
customRenderer.setImage(image);