小方块状波形图

public class WaveView extends View {

private byte[] bytes;

     private Paint mPaint;
     // 整个自定义组件的高度
     private int height;
     // 整个自定义组件的宽度
     private int width;
     // x轴的块状间隔宽度
     private int x_interval = 2;
     // y轴的块状间隔宽度
     private int y_interval = 3;
     // 颗粒状小图的高度
     private int small_height = 6;
     // 颗粒状小图的宽度
     private int small_width = 6;
     // 比例
     private float scale = 0;
     // 波形图的最大值
     private final static int MAX = 128;
     // 适配
     private GetScreenSize screenSize = null;
     // 如果没有数据时使用此数据
     private byte[] defautBytes = new byte[] { -128, -128, -128, -128, -128,
               -128, -128, -128, -128, -128, -128, -128, -128, -128, -128, -128,
               -128, -128, -128, -128, -128, -128, -128, -128, -128, -128, -128,
               -128, -128, -128, -128, -128, -128, -128, -128, -128, -128, -128,
               -128, -128, -128, -128, -128, -128, -128, -128, -128, -128, -128,
               -128, -128, -128, -128, -128, -128, -128, -128, -128, -128, -128,
               -128, -128, -128, -128, -128, -128, -128, -128, -128, -128, -128,
               -128, -128, -128, -128, -128, -128, -128, -128, -128, -128, -128,
               -128, -128, -128, -128, -128, -128, -128, -128, -128, -128, -128,
               -128, -128, -128, -128, -128, -128, -128, -128, -128, -128, -128,
               -128, -128, -128, -128, -128, -128, -128, -128, -128, -128, -128,
               -128, -128, -128, -128, -128, -128, -128, -128, -128, -128, -128,
               -128, -128 };
     // 没有波形数据时模拟数据
     private byte[] simulateBytes1 = { 121, 120, 119, 119, 118, 118, 117, 117,
               116, 116, 116, 116, 117, 117, 117, 118, 119, 119, 120, 120, 120,
               121, 121, 122, 122, 123, 124, 125, 126, 127, -128, -126, -125,
               -123, -122, -120, -119, -118, -116, -115, -113, -112, -110, -109,
               -107, -106, -104, -103, -101, -100, -98, -96, -95, -94, -93, -93,
               -92, -92, -93, -94, -95, -96, -98, -99, -101, -102, -104, -106,
               -107, -108, -110, -112, -113, -115, -117, -119, -121, -123, -125,
               -127, 127, 125, 123, 121, 119, 117, 115, 114, 112, 110, 109, 107,
               106, 105, 104, 103, 102, 100, 99, 98, 97, 96, 95, 94, 94, 94, 94,
               94, 94, 94, 95, 96, 97, 98, 99, 101, 102, 104, 105, 107, 109, 111,
               113, 115, 118, 120, 122, 125 };
     private byte[] simulateBytes2 = { -116, -117, -118, -119, -121, -122, -123,
               -125, -126, -127, 127, 126, 125, 124, 123, 121, 120, 119, 118, 117,
               116, 115, 115, 114, 113, 113, 112, 112, 111, 111, 111, 111, 111,
               110, 111, 111, 111, 111, 111, 112, 113, 113, 114, 115, 117, 118,
               120, 121, 123, 125, 127, -128, -126, -124, -122, -121, -119, -118,
               -116, -115, -114, -113, -112, -112, -111, -111, -110, -110, -109,
               -109, -109, -109, -110, -110, -111, -111, -112, -113, -114, -115,
               -117, -118, -119, -120, -122, -123, -124, -125, -127, -128, 127,
               125, 124, 123, 121, 120, 119, 118, 116, 115, 114, 114, 113, 112,
               111, 111, 110, 110, 110, 110, 110, 109, 109, 109, 109, 110, 110,
               110, 110, 111, 112, 113, 114, 115, 116, 118, 119, 121 };
     private byte[] simulateBytes3 = { 117, 117, 116, 116, 116, 116, 116, 117,
               117, 117, 118, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127,
               -128, -127, -126, -125, -124, -123, -123, -122, -121, -120, -119,
               -118, -117, -116, -116, -115, -115, -114, -114, -114, -114, -114,
               -115, -115, -116, -116, -117, -118, -119, -120, -121, -123, -124,
               -125, -127, -128, 126, 125, 123, 122, 121, 119, 118, 117, 115, 114,
               113, 112, 111, 110, 109, 108, 107, 107, 106, 106, 105, 105, 105,
               105, 105, 105, 105, 105, 106, 106, 107, 108, 109, 110, 111, 112,
               114, 116, 118, 121, 123, 126, -128, -125, -122, -119, -117, -114,
               -111, -109, -106, -103, -101, -99, -97, -94, -93, -91, -89, -88,
               -87, -86, -85, -84, -84, -83, -83, -83, -83, -84, -84 };
     private byte[] simulateBytes4 = { 124, 124, 124, 123, 123, 123, 123, 123,
               123, 123, 123, 123, 123, 123, 123, 123, 123, 123, 123, 124, 124,
               124, 124, 125, 125, 125, 126, 126, 126, 127, 127, 127, -128, -128,
               -128, -128, -128, -128, -128, -128, 127, 127, 127, 126, 126, 125,
               125, 124, 123, 122, 121, 120, 119, 118, 117, 116, 115, 113, 112,
               111, 110, 110, 109, 108, 108, 107, 107, 107, 107, 107, 106, 106,
               106, 106, 106, 106, 106, 106, 107, 107, 107, 108, 108, 109, 110,
               111, 112, 113, 114, 115, 117, 118, 120, 122, 123, 125, 127, -128,
               -126, -124, -122, -121, -119, -117, -116, -114, -112, -111, -109,
               -108, -107, -105, -104, -102, -101, -100, -99, -98, -97, -96, -95,
               -94, -94, -93, -93, -93, -93, -93 };
     private byte[] simulateBytes5 = { -86, -87, -88, -89, -90, -91, -92, -93,
               -95, -96, -97, -99, -101, -102, -104, -106, -107, -109, -111, -113,
               -114, -116, -118, -119, -121, -122, -124, -125, -126, -128, 127,
               125, 124, 122, 121, 119, 118, 116, 115, 113, 112, 111, 109, 108,
               106, 105, 104, 102, 101, 100, 99, 98, 97, 96, 95, 94, 93, 92, 91,
               90, 89, 87, 86, 84, 83, 81, 80, 78, 77, 75, 74, 72, 71, 69, 68, 66,
               65, 63, 62, 61, 59, 58, 57, 56, 55, 54, 54, 54, 53, 53, 53, 52, 52,
               52, 52, 52, 52, 52, 52, 53, 53, 54, 55, 56, 57, 59, 60, 62, 63, 65,
               67, 70, 72, 74, 76, 79, 81, 84, 86, 89, 91, 94, 96, 99, 102, 104,
               107, 109 };
     private byte[] simulateBytes6 = { 109, 111, 112, 114, 116, 117, 119, 121,
               123, 124, 126, -128, -126, -124, -122, -120, -119, -117, -115,
               -114, -112, -111, -110, -108, -107, -106, -105, -104, -103, -102,
               -101, -100, -99, -98, -98, -97, -97, -97, -97, -96, -96, -96, -96,
               -96, -96, -96, -96, -97, -97, -97, -97, -97, -97, -97, -97, -98,
               -98, -98, -98, -98, -99, -99, -99, -99, -99, -98, -98, -98, -97,
               -97, -96, -96, -95, -95, -94, -94, -94, -94, -93, -93, -93, -93,
               -93, -93, -93, -93, -94, -94, -94, -94, -94, -95, -95, -95, -96,
               -96, -97, -97, -98, -99, -100, -100, -101, -102, -104, -105, -106,
               -108, -109, -111, -112, -114, -115, -117, -119, -120, -122, -124,
               -126, -127, 127, 125, 124, 123, 121, 120, 119, 117 };
     private byte[] simulateBytes7 = { -114, -114, -114, -114, -115, -115, -116,
               -116, -117, -118, -119, -120, -121, -123, -124, -125, -126, -128,
               127, 125, 124, 123, 121, 120, 119, 117, 116, 114, 113, 112, 110,
               109, 107, 106, 105, 104, 103, 102, 101, 100, 99, 98, 98, 97, 96,
               95, 94, 93, 93, 92, 91, 90, 90, 89, 88, 88, 87, 87, 86, 86, 85, 85,
               85, 85, 85, 85, 85, 85, 86, 86, 86, 87, 88, 89, 89, 90, 91, 92, 94,
               95, 96, 97, 99, 100, 101, 103, 104, 106, 107, 108, 110, 111, 112,
               113, 115, 116, 117, 118, 119, 121, 122, 123, 124, 126, 127, -127,
               -126, -125, -123, -122, -121, -119, -118, -117, -116, -115, -114,
               -114, -113, -112, -112, -111, -110, -110, -109, -108, -108, -107 };
     private byte[] simulateBytes8 = { 110, 109, 108, 107, 107, 106, 105, 104,
               103, 102, 102, 101, 100, 100, 99, 98, 98, 98, 97, 97, 97, 97, 98,
               98, 98, 99, 100, 100, 101, 102, 103, 105, 106, 107, 108, 110, 111,
               113, 114, 115, 117, 118, 120, 122, 123, 125, 126, -128, -127, -125,
               -124, -122, -121, -119, -118, -116, -114, -113, -112, -110, -109,
               -108, -107, -106, -106, -105, -104, -104, -103, -103, -103, -103,
               -102, -102, -102, -102, -102, -102, -103, -103, -103, -103, -103,
               -103, -103, -103, -103, -103, -104, -104, -104, -104, -105, -105,
               -106, -107, -107, -108, -109, -109, -110, -111, -112, -112, -113,
               -114, -114, -115, -115, -116, -117, -117, -118, -118, -119, -119,
               -120, -121, -121, -122, -122, -122, -123, -123, -123, -123, -123,
               -124 };
     private byte[] simulateBytes9 = { 97, 97, 97, 97, 98, 98, 98, 99, 99, 100,
               100, 101, 102, 103, 104, 105, 106, 107, 109, 111, 112, 114, 116,
               118, 120, 122, 124, 126, -127, -125, -123, -121, -119, -117, -115,
               -113, -111, -109, -107, -105, -103, -102, -100, -99, -98, -97, -96,
               -95, -95, -94, -94, -94, -94, -94, -94, -94, -94, -94, -94, -95,
               -95, -96, -96, -97, -98, -98, -99, -100, -101, -102, -103, -104,
               -105, -106, -107, -108, -109, -110, -111, -112, -113, -114, -115,
               -117, -118, -119, -120, -121, -121, -122, -123, -124, -125, -126,
               -127, -128, -128, 127, 127, 126, 126, 125, 125, 125, 125, 125, 125,
               125, 125, 125, 125, 125, 126, 126, 126, 126, 126, 126, 126, 126,
               126, 126, 126, 126, 126, 126, 126, 126 };
     // 模拟数据数组
     private byte[][] totalBytes = new byte[][] { simulateBytes1,
               simulateBytes2, simulateBytes3, simulateBytes4, simulateBytes5,
               simulateBytes6, simulateBytes7, simulateBytes8, simulateBytes9 };

     public AudioWaveDisplay(Context context, AttributeSet attrs) {
          super(context, attrs);
          screenSize = new GetScreenSize(context);
          x_interval = GetScreenSize.autofitX(2);
          y_interval = GetScreenSize.autofitY(3);
          small_height = GetScreenSize.autofitX(6);
          small_width = GetScreenSize.autofitX(6);
     }

     public void setSimulateData() {
          int index = (int) (Math.random() * 9) % 9;
          bytes = totalBytes[index];
          invalidate();
     }

     @Override
     protected void onDraw(Canvas canvas) {
          super.onDraw(canvas);
          if (bytes == null) {
               bytes = defautBytes;
          }
          getWidthAndHeight();
          caculateScale();
          mPaint = new Paint();
          mPaint.setColor(Color.WHITE);
          mPaint.setAlpha(80);
          mPaint.setStrokeWidth(11);
          mPaint.setAntiAlias(true);
          int len = bytes.length;
          int value = 0;
          for (int i = 0; i < len - 1; i++) {
               value = i * 3;
               if (value >= len - 1) {
                    break;
               }
               double top = height - (int) (bytes[value] + 128) * height / 128;
               top = top < 0 ? -top : top;
               top = scale * top;

               // 为了保持跟默认显示的波粒图一样
               float x = 2 + i * (small_width + y_interval);
               // float x = i * (small_width + y_interval);
               for (int j = 1;; j++) {
                    float y = height - j * (small_height + x_interval);
                    if (top > y || x + small_width > width) {
                         if (j != 1) {
                              break;
                         }
                    }
                    canvas.drawRect(x, y, x + small_width, y + small_height, mPaint);
               }
               if (x + small_width > width) {
                    break;
               }
          }
     }

     private void caculateScale() {
          scale = (float) height / MAX;
     }

     private void getWidthAndHeight() {
          height = getHeight();
          width = getWidth();
     }

     public boolean isFailed(byte[] values) {
          boolean failed = true;
          if (defautBytes.length == values.length) {
               int len = defautBytes.length;
               for (int i = 0; i < len; i++) {
                    if (defautBytes[i] != values[i]) {
                         failed = false;
                         break;
                    }
               }

          } else {
               failed = false;
          }
          return failed;
     }

     public void UpdateAudioWaveDisplay(byte[] bytes) {
          this.bytes = bytes;
          invalidate();
     }

}

原文链接：http://www.apkbus.com/blog-186545-59525.html