，自定义LeafLoadingView实现，LeafLoadingView继承view,
本例子主要由以下几点构成（1）：RotateAnimation实现叶子旋转（2）：叶子飘动（3）：当前进度绘制当前进度条大体实现： @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas);// 绘制进度条和叶子
// 之所以把叶子放在进度条里绘制，主要是层级原因 drawProgressAndLeafs(canvas); // drawLeafs(canvas);canvas.drawBitmap(mOuterBitmap, mOuterSrcRect, mOuterDestRect, mBitmapPaint);
postInvalidate();
}private void drawProgressAndLeafs(Canvas canvas) {
if (mProgress >= TOTAL_PROGRESS) {
mProgress = 0; } // mProgressWidth为进度条的宽度，根据当前进度算出进度条的位置 mCurrentProgressPosition = mProgressWidth * mProgress / TOTAL_PROGRESS; // 即当前位置在图中所示1范围内 if (mCurrentProgressPosition < mArcRadius) { Log.i(TAG, "mProgress = " + mProgress + "---mCurrentProgressPosition = " + mCurrentProgressPosition + "--mArcProgressWidth" + mArcRadius); // 1.绘制白色ARC，绘制orange ARC // 2.绘制白色矩形// 1.绘制白色ARC
canvas.drawArc(mArcRectF, 90, 180, false, mWhitePaint);// 2.绘制白色矩形
mWhiteRectF.left = mArcRightLocation; canvas.drawRect(mWhiteRectF, mWhitePaint);// 绘制叶子
drawLeafs(canvas);// 3.绘制棕色 ARC
// 单边角度 int angle = (int) Math.toDegrees(Math.acos((mArcRadius - mCurrentProgressPosition) / (float) mArcRadius)); // 起始的位置 int startAngle = 180 - angle; // 扫过的角度 int sweepAngle = 2 * angle; Log.i(TAG, "startAngle = " + startAngle); canvas.drawArc(mArcRectF, startAngle, sweepAngle, false, mOrangePaint); } else { Log.i(TAG, "mProgress = " + mProgress + "---transfer-----mCurrentProgressPosition = " + mCurrentProgressPosition + "--mArcProgressWidth" + mArcRadius); // 1.绘制white RECT // 2.绘制Orange ARC // 3.绘制orange RECT // 这个层级进行绘制能让叶子感觉是融入棕色进度条中// 1.绘制white RECT
mWhiteRectF.left = mCurrentProgressPosition; canvas.drawRect(mWhiteRectF, mWhitePaint); // 绘制叶子 drawLeafs(canvas); // 2.绘制Orange ARC canvas.drawArc(mArcRectF, 90, 180, false, mOrangePaint); // 3.绘制orange RECT mOrangeRectF.left = mArcRightLocation; mOrangeRectF.right = mCurrentProgressPosition; canvas.drawRect(mOrangeRectF, mOrangePaint);}
}
/**
* 绘制叶子 * * canvas */ private void drawLeafs(Canvas canvas) { mLeafRotateTime = mLeafRotateTime <= 0 ? LEAF_ROTATE_TIME : mLeafRotateTime; long currentTime = System.currentTimeMillis(); for (int i = 0; i < mLeafInfos.size(); i++) { Leaf leaf = mLeafInfos.get(i); if (currentTime > leaf.startTime && leaf.startTime != 0) { // 绘制叶子－－根据叶子的类型和当前时间得出叶子的（x，y） getLeafLocation(leaf, currentTime); // 根据时间计算旋转角度 canvas.save(); // 通过Matrix控制叶子旋转 Matrix matrix = new Matrix(); float transX = mLeftMargin + leaf.x; float transY = mLeftMargin + leaf.y; Log.i(TAG, "left.x = " + leaf.x + "--leaf.y=" + leaf.y); matrix.postTranslate(transX, transY); // 通过时间关联旋转角度，则可以直接通过修改LEAF_ROTATE_TIME调节叶子旋转快慢 float rotateFraction = ((currentTime - leaf.startTime) % mLeafRotateTime) / (float) mLeafRotateTime; int angle = (int) (rotateFraction * 360); // 根据叶子旋转方向确定叶子旋转角度 int rotate = leaf.rotateDirection == 0 ? angle + leaf.rotateAngle : -angle + leaf.rotateAngle; matrix.postRotate(rotate, transX + mLeafWidth / 2, transY + mLeafHeight / 2); canvas.drawBitmap(mLeafBitmap, matrix, mBitmapPaint); canvas.restore(); } else { continue; } } }
运行效果：
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