Android绘制音乐播放器示波器

 /**画笔*/
 private Paint mPaint;
 /**控件的宽度*/
 private float mWidth;
 /**单个柱子的宽度*/
 private float mRectWidth;
 /**单个柱子的高度*/
 private float mRectHeight;
 /**柱子的总个数*/
 private float mRectCount = 10;
 /**柱子之间的间隔*/
 private int offsets = 2;
 /**Android中的线性渐变*/
 private LinearGradient mLinearGradient;
 /**随机的柱子的高度*/
 private double mRandom;

 /**
  * 初始化画笔
  */
 private void initView() {
  mPaint = new Paint();
  mPaint.setAntiAlias(true);
 }

 @Override
 protected void onSizeChanged(int w, int h, int oldw, int oldh) {
  super.onSizeChanged(w, h, oldw, oldh);
  mWidth = getWidth();
  mRectHeight = getHeight();
  mRectWidth = (int) (mWidth * 0.6 / mRectCount);
  mLinearGradient = new LinearGradient(0, 0, mRectWidth, mRectHeight,
    Color.YELLOW, Color.BLUE, Shader.TileMode.CLAMP);
  mPaint.setShader(mLinearGradient);

 }

 @Override
 protected void onDraw(Canvas canvas) {
  super.onDraw(canvas);
  for (int i = 0; i < mRectCount; i++) {
   mRandom = Math.random();
   float currentHeight = (float) (mRectHeight * mRandom);
   canvas.drawRect(
     (float) (mWidth * 0.4 / 2 + mRectWidth * i + offsets),
     currentHeight, (float) (mWidth * 0.4 / 2 + mRectWidth
       * (i + 1)), mRectHeight, mPaint);
  }

 }

public class MusicLine extends View {
 private Paint mPaint;
 private float mWidth;
 private float mRectWidth;
 private float mRectHeight;
 private float mRectCount = 10;
 private int offsets = 2;
 private LinearGradient mLinearGradient;
 private double mRandom;

 public MusicLine(Context context, AttributeSet attrs, int defStyle) {
  super(context, attrs, defStyle);

  initView();
 }

 public MusicLine(Context context, AttributeSet attrs) {
  super(context, attrs);
  initView();
 }

 public MusicLine(Context context) {
  super(context);
  initView();
 }

 /**
  * 初始化工具类
  */
 private void initView() {
  mPaint = new Paint();
  mPaint.setAntiAlias(true);
 }

 @Override
 protected void onSizeChanged(int w, int h, int oldw, int oldh) {
  super.onSizeChanged(w, h, oldw, oldh);
  mWidth = getWidth();
  mRectHeight = getHeight();
  mRectWidth = (int) (mWidth * 0.6 / mRectCount);
  mLinearGradient = new LinearGradient(0, 0, mRectWidth, mRectHeight,
    Color.YELLOW, Color.BLUE, Shader.TileMode.CLAMP);
  mPaint.setShader(mLinearGradient);

 }

 @Override
 protected void onDraw(Canvas canvas) {
  super.onDraw(canvas);
  for (int i = 0; i < mRectCount; i++) {
   mRandom = Math.random();
   float currentHeight = (float) (mRectHeight * mRandom);
   canvas.drawRect(
     (float) (mWidth * 0.4 / 2 + mRectWidth * i + offsets),
     currentHeight, (float) (mWidth * 0.4 / 2 + mRectWidth
       * (i + 1)), mRectHeight, mPaint);
  }

 }

 public void onStart() {
  postInvalidateDelayed(300);
 }

}