How to fill a Path in Android with a linear gradient?

While steelbytes’ answer will probably give you more control over the individual sections of the gradient, you can do it without the path:

Paint m_Paint = new Paint();
protected void onDraw(Canvas canvas)
{
    super.onDraw(canvas);
    // start at 0,0 and go to 0,max to use a vertical
    // gradient the full height of the screen.
    m_Paint.setShader(new LinearGradient(0, 0, 0, getHeight(), Color.BLACK, Color.WHITE, Shader.TileMode.MIRROR));
    canvas.drawPaint(m_Paint);
}