概述：
360安全卫士的那个刷新球（姑且叫它刷新球，因为真的不知道叫什么好，不是dota里的刷新球！！），里面像住了水一样，生动可爱，，看似简单，写起来不太简单，本例程只是实现了它的部分功能而已，说实话，跟360的刷新球比起来差距还是很大，我这个长得有点挫。 本历程需要用到的知识包括：android的自定义View，自定义canvas、path、Bitmap、Handler
先结果演示：
Damo{private int width;private int height;private int progress;private int maxProgress = 100;private Path mPath;private Paint mPaintCircle;private Paint mPaintWave;private Paint mPaintText;private Bitmap mBitmapBubble;private Canvas mCanvasBitmap;count;isAdd = true;START_WAVE = 0x21;() {return progress;}(int progress) {this.progress = progress;invalidate();}() {return maxProgress;}(int maxProgress) {this.maxProgress = maxProgress;}private Handler handler = new Handler() {(Message msg) {super.handleMessage(msg);switch (msg.what) {case START_WAVE:count += 30;if (count >= 180) {count = 0;}if (isAdd) {size += 7;if (size > 41) {isAdd = false;}} else {size -= 7;if (size <= -41) {isAdd = true;}}invalidate();sendEmptyMessageDelayed(START_WAVE, 100);break;}}};public MyPathView(Context context) {super(context);}public MyPathView(Context context, AttributeSet attrs) {super(context, attrs);mPaintCircle = new Paint();mPaintCircle.setStyle(Paint.Style.FILL_AND_STROKE);mPaintCircle.setColor(Color.argb(0X4f, 0x4d, 0x4d, 0xff));mPaintText = new Paint();mPaintText.setColor(Color.WHITE);mPaintText.setTextSize(50);mPaintText.setTextAlign(Paint.Align.CENTER);mPaintWave = new Paint();mPaintWave.setColor(Color.argb(0xaa, 0xff, 0x7c, 0x00));mPaintWave.setStyle(Paint.Style.FILL);//不显示非重叠部分，并且重叠部分显示自己PorterDuffXfermode mode = new PorterDuffXfermode(PorterDuff.Mode.SRC_ATOP);mPaintWave.setXfermode(mode);mPath = new Path();handler.sendEmptyMessageDelayed(START_WAVE, 1000);}(int widthMeasureSpec, int heightMeasureSpec) {super.onMeasure(widthMeasureSpec, heightMeasureSpec);width = getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec);height = getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec);setMeasuredDimension(width, height);mBitmapBubble = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);mCanvasBitmap = new Canvas(mBitmapBubble);}(Canvas canvas) {super.onDraw(canvas);mPath.reset();//canvas.drawColor(Color.argb(0xaa, 0x88, 0x7e, 0x7f));//自定义颜色mCanvasBitmap.drawCircle(width / 2, height / 2, 200, mPaintCircle);mPath.reset();//用path圈出一个矩形，把水波和球的包含进去mPath.moveTo(width / 2 + 200, height / 2 + 200 – progress / maxProgress * 400);mPath.lineTo(width / 2 + 200, height / 2 + 200);mPath.lineTo(0, height / 2 + 200);mPath.lineTo(0, height / 2 + 200 – progress / maxProgress * 400);/*画一条个模拟流动的波浪*///当count增大时，重绘会显示向前流动效果,count的值不能大于width/2-200mPath.lineTo(count, height / 2 + 200 -(float) progress / maxProgress * 400);(int i = 0; i < 20; i++) {/*rQuadTo()方法每次都会自动移动到下一位置，参数依次为水平幅度，垂直幅度，水平位移，处置位移*/mPath.rQuadTo(20, size, 90, 0);mPath.rQuadTo(20, -size, 90, 0);}mPath.close();mCanvasBitmap.drawPath(mPath, mPaintWave);canvas.drawBitmap(mBitmapBubble, 0, 0, null);//绘制文本，当前进度canvas.drawText(progress*100/maxProgress+”%”,width/2,height/2,mPaintText);}}只做第一个我，不做第二个谁。
