自定义view实现水波纹效果（已优化）

引用  http://blog.csdn.NET/tianjian4592/article/details/44222565

看了下网上实现的自定义水波纹效果控件，发现标准正余弦水波纹使用起来很卡顿，因此，实现了一个优化版本：

public class WaveView extends View  
{  
  
	 // 波纹颜色  
    private static final int WAVE_PAINT_COLOR1 = 0x473770dd;  
	 // 波纹颜色  
    private static final int WAVE_PAINT_COLOR2 = 0x333e27f0; 
    
    // y = Asin(wx+b)+h  
    private static final float STRETCH_FACTOR_A = 8;  
    private static final int OFFSET_Y = 0;  
    // 第一条水波移动速度  
    private static final int TRANSLATE_X_SPEED_ONE = 3;  
    // 第二条水波移动速度  
    private static final int TRANSLATE_X_SPEED_TWO = 2;  
    private float mCycleFactorW;  
  
    private int mTotalWidth, mTotalHeight;  
    private float[] mYPositions;  
    private float[] mResetOneYPositions;  
    private float[] mResetTwoYPositions;  
    private int mXOffsetSpeedOne;  
    private int mXOffsetSpeedTwo;  
    private int mXOneOffset;  
    private int mXTwoOffset;  
  
    private Paint mWavePaint1;  
    private Paint mWavePaint2;
    private DrawFilter mDrawFilter;  
    private float progress = 1.0f;
    
    private float nowProgress=0f;
    private int continueTime=0;//上升动画效果持续时间，默认0
    
    /**
     * 
     * @Title: setProgress 
     * @Description: 设置水波纹动画上升的高度百分比及持续时间
     * @author: wukeqi   
     * @date: 2017-4-27 上午8:49:44 
     * @param progress
     * @param continueTime
     * @return: void
     */
    public void setProgress(float progress,int continueTime)
    {
    	this.progress = progress;
    	this.continueTime=continueTime;
    	postInvalidate();
    }
  
    public WaveView(Context context, AttributeSet attrs) {  
        super(context, attrs);  
        // 将dp转化为px，用于控制不同分辨率上移动速度基本一致  
        mXOffsetSpeedOne = Utils.dip2px(context, TRANSLATE_X_SPEED_ONE);  
        mXOffsetSpeedTwo =  Utils.dip2px(context, TRANSLATE_X_SPEED_TWO);  
  
        // 初始绘制波纹的画笔  
        mWavePaint1 = new Paint();  
        // 去除画笔锯齿  
        mWavePaint1.setAntiAlias(true);  
        // 设置风格为实线  
        mWavePaint1.setStyle(Style.FILL);  
        // 设置画笔颜色  
        mWavePaint1.setColor(WAVE_PAINT_COLOR1);  
     // 初始绘制波纹的画笔  
        mWavePaint2 = new Paint();  
        // 去除画笔锯齿  
        mWavePaint2.setAntiAlias(true);  
        // 设置风格为实线  
        mWavePaint2.setStyle(Style.FILL);  
        // 设置画笔颜色  
        mWavePaint2.setColor(WAVE_PAINT_COLOR2); 
        
        mDrawFilter = new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG);  
    }  
  
    @Override  
    protected void onDraw(Canvas canvas) {  
        super.onDraw(canvas);  
        // 从canvas层面去除绘制时锯齿  
        canvas.setDrawFilter(mDrawFilter);  
        resetPositonY();  
   /*     for (int i = 0; i < mTotalWidth; i++) {  
  
            // 减400只是为了控制波纹绘制的y的在屏幕的位置，大家可以改成一个变量，然后动态改变这个变量，从而形成波纹上升下降效果  
            // 绘制第一条水波纹  
            canvas.drawLine(i, mTotalHeight - mResetOneYPositions[i] - (mTotalHeight-STRETCH_FACTOR_A)*progress, i,  
                    mTotalHeight,  
                    mWavePaint1);  
  
            // 绘制第二条水波纹  
            canvas.drawLine(i, mTotalHeight - mResetTwoYPositions[i] - (mTotalHeight-STRETCH_FACTOR_A)*progress, i,  
                    mTotalHeight,  
                    mWavePaint2);  
        }  */
        
        canvas.drawLines(mResetOneYPositions, mWavePaint1);
        canvas.drawLines(mResetTwoYPositions, mWavePaint2);
  
        // 改变两条波纹的移动点  
        mXOneOffset += mXOffsetSpeedOne;  
        mXTwoOffset += mXOffsetSpeedTwo;  
  
        // 如果已经移动到结尾处，则重头记录  
        if (mXOneOffset >= mTotalWidth) {  
            mXOneOffset = 0;  
        }  
        if (mXTwoOffset > mTotalWidth) {  
            mXTwoOffset = 0;  
        }  
        
        //y轴上升的 百分比，形成缓缓上升的效果
        nowProgress+=progress/(continueTime/20<=0?1:continueTime/20);
        
        nowProgress=nowProgress>=progress?progress:nowProgress;
  
        // 引发view重绘，一般可以考虑延迟20-30ms重绘，空出时间片  
         
        handler.sendEmptyMessageDelayed(0, 20);
    }  
  
    private Handler handler = new Handler()
    		{

				@Override
				public void handleMessage(Message msg) {
					// TODO Auto-generated method stub
					super.handleMessage(msg);
					postInvalidate(); 
				}
    	
    		};
    private void resetPositonY() {  
      /*  // mXOneOffset代表当前第一条水波纹要移动的距离  
        int yOneInterval = mYPositions.length/4 - mXOneOffset;  
        // 使用System.arraycopy方式重新填充第一条波纹的数据  
        System.arraycopy(mYPositions, mXOneOffset*4, mResetOneYPositions, 0, yOneInterval*4);  
        System.arraycopy(mYPositions, 0, mResetOneYPositions, yOneInterval*4, mXOneOffset*4);  
        
        
  
        int yTwoInterval = mYPositions.length/4 - mXTwoOffset;  
        System.arraycopy(mYPositions, mXTwoOffset*4, mResetTwoYPositions, 0,  
                yTwoInterval*4);  
        System.arraycopy(mYPositions, 0, mResetTwoYPositions, yTwoInterval*4, mXTwoOffset*4);*/  
    	
    	//根据偏移量重新赋值（y轴起点处的值）
        
        for(int i=0;i

有什么错误的地方希望大家多多指教