如何在Android中获取类似波形的音云 [英] How to Get a soundcloud like waveforms in Android

问题描述

我使用我的代码生成了一个简单的波形，如下图所示。

I have generated a simple waveform like the picture below with my code.

但是我想在每一行之间留出更多的空隙，我希望它像下面的picutre之类的音云波。

But I want to give more gap between each line I want it to be like the soundcloud waves like the picutre below.

这是我的代码：

Here is my code:

public class VisualizerView extends View {
    private static final int LINE_WIDTH = 15; // width of visualizer lines
    private static final int LINE_SCALE = 55; // scales visualizer lines
    private List<Float> amplitudes; // amplitudes for line lengths
    private int width; // width of this View
    private int height; // height of this View
    private Paint linePaint; // specifies line drawing characteristics

    // constructor
    public VisualizerView(Context context, AttributeSet attrs) {
        super(context, attrs); // call superclass constructor
        linePaint = new Paint(); // create Paint for lines
        linePaint.setColor(Color.parseColor("#a4410e")); // set color to green
        linePaint.setStrokeWidth(LINE_WIDTH); // set stroke width
    }

    // called when the dimensions of the View change
    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        width = w; // new width of this View
        height = h; // new height of this View
        amplitudes = new ArrayList<Float>(width / LINE_WIDTH);
    }

    // clear all amplitudes to prepare for a new visualization
    public void clear() {
        amplitudes.clear();
    }

    // add the given amplitude to the amplitudes ArrayList
    public void addAmplitude(float amplitude) {
        amplitudes.add(amplitude); // add newest to the amplitudes ArrayList

        // if the power lines completely fill the VisualizerView
        if (amplitudes.size() * LINE_WIDTH >= width) {
            amplitudes.remove(0); // remove oldest power value
        }
    }

    // draw the visualizer with scaled lines representing the amplitudes
    @Override
    public void onDraw(Canvas canvas) {
        int middle = height / 2; // get the middle of the View
        float curX = 0; // start curX at zero

        // for each item in the amplitudes ArrayList
        for (float power : amplitudes) {
            float scaledHeight = power / LINE_SCALE; // scale the power
            curX += LINE_WIDTH; // increase X by LINE_WIDTH

            Log.e("crux",String.valueOf(curX));

            // draw a line representing this item in the amplitudes ArrayList
            canvas.drawLine(curX, middle + scaledHeight / 2, curX, middle
                    - scaledHeight / 2, linePaint);
        }
    }

}

从这么几个小时开始，请有人让我退出

Stuck on it from so many hours please someone get me out of it

推荐答案

我尝试了对代码进行随机更改并获得了所需的输出您需要通过更改这两行来

I tried the random changes in your code and got the desired output you needed

private static final int LINE_WIDTH = 2  (from 15 to 2); // width of visualizer lines
curX += LINE_WIDTH+5; // increase X by LINE_WIDTH (adding +5)

---

---

public class VisualizerView extends View {
    private static final int LINE_WIDTH = 2; // width of visualizer lines
    private static final int LINE_SCALE = 55; // scales visualizer lines
    private List<Float> amplitudes; // amplitudes for line lengths
    private int width; // width of this View
    private int height; // height of this View
    private Paint linePaint; // specifies line drawing characteristics

    // constructor
    public VisualizerView(Context context, AttributeSet attrs) {
        super(context, attrs); // call superclass constructor
        linePaint = new Paint(); // create Paint for lines
        linePaint.setColor(Color.parseColor("#a4410e")); // set color to green
        linePaint.setStrokeWidth(LINE_WIDTH); // set stroke width
    }

    // called when the dimensions of the View change
    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        width = w; // new width of this View
        height = h; // new height of this View
        amplitudes = new ArrayList<Float>(width / LINE_WIDTH);
    }

    // clear all amplitudes to prepare for a new visualization
    public void clear() {
        amplitudes.clear();
    }

    // add the given amplitude to the amplitudes ArrayList
    public void addAmplitude(float amplitude) {
        amplitudes.add(amplitude); // add newest to the amplitudes ArrayList

        // if the power lines completely fill the VisualizerView
        if (amplitudes.size() * LINE_WIDTH >= width) {
            amplitudes.remove(0); // remove oldest power value
        }
    }

    // draw the visualizer with scaled lines representing the amplitudes
    @Override
    public void onDraw(Canvas canvas) {
        int middle = height / 2; // get the middle of the View
        float curX = 0; // start curX at zero

        // for each item in the amplitudes ArrayList
        for (float power : amplitudes) {
            float scaledHeight = power / LINE_SCALE; // scale the power
            curX += LINE_WIDTH+5; // increase X by LINE_WIDTH

            Log.e("crux",String.valueOf(curX));

            // draw a line representing this item in the amplitudes ArrayList
            canvas.drawLine(curX, middle + scaledHeight / 2, curX, middle
                    - scaledHeight / 2, linePaint);
        }
    }

}

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