Android自定义view实现水波进度条控件

<com.yhongm.wave_progress_view.WaveProgressView  android:id="@+id/wave_progress_view"  android:layout_width="300dp"  android:layout_height="300dp"  android:layout_centerInParent="true"  app:circleColor="#e38854"  app:progress="0"  app:waterColor="#5488e3" />

/**   * 生成水波流动   *   * @param begin    水波形开始的位置   * @param waveLength 水波的长度   * @param waveOffsetX 水波水平的偏移   * @param waveOffsetY 水波垂直方向的偏移   * @return   */  private Path getWavePath(float begin, int waveLength, int waveOffsetX, int waveOffsetY) {    Path mPath = new Path();    mPath.reset();    mPath.moveTo(waveLength * begin, mCurrentHeight);    for (int i = 0; i < mWaveCount; i++) {      mPath.quadTo(waveLength * (begin + 0.25f) + (i * waveLength) + waveOffsetX, mCurrentHeight + waveOffsetY, (waveLength * (begin + 0.5f) + (i * waveLength) + waveOffsetX), mCurrentHeight);      mPath.quadTo(waveLength * (begin + 0.75f) + (i * waveLength) + waveOffsetX, mCurrentHeight - waveOffsetY, (waveLength * (begin + 1f) + (i * waveLength) + waveOffsetX), mCurrentHeight);    }    mPath.lineTo(mWidth, mHeight);    mPath.lineTo(0, mHeight);    mPath.close();    return mPath;  } 

/**   * 水滴的Path   *   * @param x  水滴坐标x   * @param y  水滴坐标y   * @param size 水滴尺寸   * @return   */  private Path waterDrop(float x, float y, int size) {    Path mDropPath = new Path();    mDropPath.moveTo(x - size, y);    mDropPath.lineTo(x, (float) (y - size * 2.5));    mDropPath.lineTo(x + size, y);    mDropPath.addArc(x - size, y - size, x + size, y + size, 0, 180);    return mDropPath;  }

/**   * 根据位置画水滴   *   * @param x   * @param y   * @param canvas   */  private void drawDropByLocation(Canvas canvas, int x, int y) {    Path mDropPath = waterDrop(x, y, 30);    if (y == (mCurrentHeight + 50)) {      mDropPaint.setAlpha(0);    }    canvas.drawPath(mDropPath, mDropPaint);  }

/**   * 画两侧水滴飞溅的效果，并且随机生成水滴   *   * @param canvas   * @param x   * @param y   当前高度   */  private synchronized void drawDropSplash(Canvas canvas, int x, int y) {    PathMeasure mLeftPathMeasure = getOnBothSidesOfPathMeasure(x, y, true);    PathMeasure mRightPathMeasure = getOnBothSidesOfPathMeasure(x, y, false);    float[] mLeftPos = new float[2];    float[] mRightPos = new float[2];    float[] mLeftTan = new float[2];    float[] mRightTan = new float[2];    for (int i = 0; i < 200; i++) {      float percent = i / 200f;      mLeftPathMeasure.getPosTan(mLeftPathMeasure.getLength() * percent, mLeftPos, mLeftTan);      mRightPathMeasure.getPosTan(mRightPathMeasure.getLength() * percent, mRightPos, mRightTan);      mLeftHashMapPath.put(Math.round(mLeftPos[1]), mLeftPos[0]);      mRightHashMapPath.put(Math.round(mRightPos[1]), mRightPos[0]);    }    if (mRandomHashMap.isEmpty() && mRandomHashMap.size() == 0) {      pushRandomDrag(y);    }    drawRandomDrag(canvas, x, y, mLeftHashMapPath, mRightHashMapPath);    drawOnBothSidesOfWaterDrop(canvas, mLeftPathMeasure);    drawOnBothSidesOfWaterDrop(canvas, mRightPathMeasure);}

/**   * 产生随机的水滴   *   * @param y   */  private void pushRandomDrag(int y) {    Random r = new Random();    for (int i = 0; i < 20; i++) {      int randomY = r.nextInt(y);      if (mLeftHashMapPath.containsKey(randomY)) {        Float rightValue = mRightHashMapPath.get(randomY);        Float leftValue = mLeftHashMapPath.get(randomY);        int roundLeftValue = Math.round(leftValue);        int roundRightValue = Math.round(rightValue);        if (roundRightValue == roundLeftValue) {          roundRightValue++;        }        int roundMinus = Math.round(roundRightValue - roundLeftValue);//左右差值        float randomX = r.nextInt(roundMinus) + mLeftHashMapPath.get(randomY);//左右差值加上最小值,保证随机值在两者之间        mRandomHashMap.put(randomX, randomY);      }    }}

/**   * 画随机生成水滴溅起   *   * @param canvas   * @param x   * @param y   * @param size   * @param randomY   * @param randomX   */  private void drawSmartDropOnPath(Canvas canvas, int x, int y, int size, int randomY, float randomX) {    Path smartDropPath = new Path();    smartDropPath.moveTo(x, y + 50);    if (x < randomX) {      smartDropPath.cubicTo(x, y + 50, randomX + 30, randomY - 20, randomX, randomY);    } else {      smartDropPath.cubicTo(x, y + 50, randomX - 30, randomY - 20, randomX, randomY);    }    smartDropPath.lineTo(randomX, randomY + 150);    PathMeasure pathMeasure = new PathMeasure();    pathMeasure.setPath(smartDropPath, false);    float[] pos = new float[2];    float[] tan = new float[2];    pathMeasure.getPosTan(pathMeasure.getLength() * mPercent, pos, tan);    Path path = waterDrop(pos[0], pos[1], size);    canvas.drawPath(path, mSplashPaint);  }