如何使用Java而不是XML来更改此自定义进度条的颜色？

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import import android.widget.ProgressBar;

public class CustomProgressBar extends ProgressBar {
    private Paint paint;

    public CustomProgressBar(Context context) {
        super(context);
        init();
    }

    private void init() {
        paint = new Paint();
        paint.setColor(Color.RED); // 设置进度条颜色为红色
    }

    @Override
    protected synchronized void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        canvas.drawRect(0, 0, getProgress() * getWidth() / getMax(), getHeight(), paint); // 绘制进度条
    }
}

CustomProgressBar progressBar = new CustomProgressBar(context);