Multiple colors for single path Android

Question

Good day.I am creating a siri like wave for android and i encounter an big issue.I need the wave to be in 4 colors.Lets assume i only have one single line which is drawing on the screen accordingly to the voice decibels.Anyway i am able to do it but no way i am able to give 4 different colors for same path.Assume it is 1 single path which moves from screen start to screen end,i need that line to have 4 different colors,mainly i had to divide the path into 4 parts and draw the color for each parts,but neither google,nor any other source give me anything (not even found anything similar to what i want). Meanwhile i am posting the code where actually i am drawing the lines.

    for (int l = 0; l < mWaveCount; ++l) {
            float midH = height / 2.0f;
            float midW = width / 2.0f;

            float maxAmplitude = midH / 2f - 4.0f;

            float progress = 1.0f - l * 1.0f / mWaveCount;
            float normalAmplitude = (1.5f * progress - 0.5f) * mAmplitude;

            float multiplier = (float) Math.min(1.0, (progress / 3.0f * 2.0f) + (1.0f / 3.0f));

            if (l != 0) {
                mSecondaryPaint.setAlpha((int) (multiplier * 255));
            }

            mPath.reset();
            for (int x = 0; x < width + mDensity; x += mDensity) {
                float scaling = 1f - (float) Math.pow(1 / midW * (x - midW), 2);
                float y = scaling * maxAmplitude * normalAmplitude * (float) Math.sin(
                        180 * x * mFrequency / (width * Math.PI) + mPhase) + midH;
//                canvas.drawPoint(x, y, l == 0 ? mPrimaryPaint : mSecondaryPaint);
//
//                canvas.drawLine(x, y, x, 2*midH - y, mSecondaryPaint);


                if (x == 0) {
                    mPath.moveTo(x, y);
                } else {
                    mPath.lineTo(x, y);
//                    final float x2 = (x + mLastX) / 2;
//                    final float y2 = (y + mLastY) / 2;
//                    mPath.quadTo(x2, y2, x, y);
                }

                mLastX = x;
                mLastY = y;
            }


            if (l == 0) {
                canvas.drawPath(mPath, mPrimaryPaint);
            } else {
                canvas.drawPath(mPath, mSecondaryPaint);
            }
        }

I tried to change color on if (l == 0) { canvas.drawPath(mPath, mPrimaryPaint); } but if i change it here,no result at all,either the line is separate and not moving at all,but it should,either the color is not applied,propably because i am doing it in loop as i had to and everytime the last color is picked to draw.Anyway can you help me out?Even an small reference is gold for me because really there is nothing at all in the internet.

Answer 1

Anyway even though Matt Horst answer fully correct,i found the simplest and easiest solution...i never thought it would be so easy.Anyway if in world there is someone who need to make an path divided into multiple colors,here is what you can do

    int[] rainbow = getRainbowColors();
    Shader shader = new LinearGradient(0, 0, 0, width, rainbow,
            null, Shader.TileMode.REPEAT);
    Matrix matrix = new Matrix();
    matrix.setRotate(90);
    shader.setLocalMatrix(matrix);
    mPrimaryPaint.setShader(shader);

Where getRainbowColors() is an array of colors you wish your line to have and width is the length of the path so the Shader knows how to draw the colors in right way to fit the length of path.Anyway .....easy isnt it?and pretty purged me a lot to get into this simple point.Nowhere in internet you could find only if you are looking for something completelly different,than you might come across this.