//绘制波纹 
  private Paint mWavePaint;  
  private PorterDuffXfermode mMode = new PorterDuffXfermode(PorterDuff.Mode.XOR);//设置mode 为XOR 
  //绘制圆 
  private Paint mCirclePaint; 
  private Canvas mCanvas;//我们自己的画布 
  private Bitmap mBitmap; 
  private int mWidth; 
  private int mHeight; 
 
  public WaveLoadingView(Context context) { 
    this(context,null); 
  } 
 
  public WaveLoadingView(Context context, AttributeSet attrs) { 
    this(context, attrs,0); 
  } 
 
  public WaveLoadingView(Context context, AttributeSet attrs, int defStyleAttr) { 
    super(context, attrs, defStyleAttr); 
 
    mWavePaint = new Paint(); 
    mWavePaint.setColor(Color.parseColor("#33b5e5")); 
    mCirclePaint = new Paint(); 
    mCirclePaint.setColor(Color.parseColor("#99cc00")); 
     
 
  } 
  @Override 
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 
    int widthSize = MeasureSpec.getSize(widthMeasureSpec); 
    int widthMode = MeasureSpec.getMode(widthMeasureSpec); 
    int heightSize = MeasureSpec.getSize(heightMeasureSpec); 
    int heightMode = MeasureSpec.getMode(heightMeasureSpec); 
    if (widthMode == MeasureSpec.EXACTLY) { 
      mWidth = widthSize; 
    } 
 
 
    if (heightMode == MeasureSpec.EXACTLY) { 
      mHeight = heightSize; 
    } 
    setMeasuredDimension(mWidth, mHeight); 
    mBitmap = Bitmap.createBitmap(300,300, Bitmap.Config.ARGB_8888); //生成一个bitmap 
    mCanvas = new Canvas(mBitmap);//讲bitmp放在我们自己的画布上，实际上mCanvas.draw的时候 改变的是这个bitmap对象 
  } 
   

@Override 
  protected void onDraw(Canvas canvas) { 
    mCanvas.drawCircle(100,100,50,mCirclePaint); 
 
    mCanvas.drawRect(100,100,200,200,mWavePaint); 
    canvas.drawBitmap(mBitmap,0,0,null); 
    super.onDraw(canvas); 
  } 

private PorterDuffXfermode mMode = new PorterDuffXfermode(PorterDuff.Mode.DST_OVER); 

protected void onDraw(Canvas canvas) { 
 
    //dst 
    mCanvas.drawCircle(150,150,50,mCirclePaint); 
 
/    mWavePaint.setXfermode(mMode); 
    //src 
    mCanvas.drawRect(100,100,200,200,mWavePaint); 
    canvas.drawBitmap(mBitmap,0,0,null); 
    super.onDraw(canvas); 
  } 

 if (x > 50) { 
      isLeft = true; 
    } else if (x < 0) { 
      isLeft = false; 
    } 
<span style="white-space:pre">    </span>if (y > -50) { //大于-50是因为辅助点是50 为了让他充满整个屏幕 
      y--; 
    }    if (isLeft) { 
      x = x - 1; 
    } else { 
      x = x + 1; 
    } 
    mPath.reset(); 
    mPath.moveTo(0, y); 
    mPath.cubicTo(100 + x*2, 50 + y, 100 + x*2, y-50, mWidth, y);//前两个参数是辅助点 
    mPath.lineTo(mWidth, mHeight);//充满整个画布 
    mPath.lineTo(0, mHeight);//充满整个画布 
    mPath.close(); 

mBitmap.eraseColor(Color.parseColor("#00000000")); 
 
//dst 
 mCanvas.drawPath(mPath, mPaint); 

canvas.drawBitmap(mBitmap, 0, 0, null); 
 
 
    postInvalidateDelayed(10); 

mCanvas.drawCircle(mWidth / 2, mHeight / 2, mWidth / 2, mSRCPaint); 

//dst 
   mCanvas.drawCircle(mWidth / 2, mHeight / 2, mWidth / 2, mSRCPaint); 
 
   mPaint.setXfermode(mMode); 
   //src 
   mCanvas.drawPath(mPath, mPaint); 
 
   canvas.drawBitmap(mBitmap, 0, 0, null); 

public void setPercent(int percent){ 
    mPercent = percent; 
  } 

String str = mPercent + "%"; 
    float txtLength = mTextPaint.measureText(str); 
    canvas.drawText(mPercent + "%", mWidth / 2-txtLength/2, mHeight / 2, mTextPaint);