1.仿微信下拉錄制視頻

介紹：

本項目高仿微信小視頻+秒拍，微信從6.0版本開始推出小視頻功能，隨著4G網絡的出現，視頻將會是一個趨勢，
他能表達出文字所不能表現的東西，增加了微信的黏性。?還記得微信小視頻這個功能一推出，如同病毒一樣席卷朋友圈。
由作者：Juns?Allen?精心編寫的
項目源碼：http://www.itlanbao.com/code/20151117/11253/100648.html

運行效果：

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2.一個很酷的加載loading效果

介紹：

一個很酷的加載loading效果，自定義LeafLoadingView實現，LeafLoadingView繼承view,
本例子主要由以下幾點構成
（1）：RotateAnimation實現葉子旋轉
（2）：葉子飄動
（3）：當前進度繪制當前進度條
大體實現源碼如下：
?@Override
??? protected void onDraw(Canvas canvas) {
??????? super.onDraw(canvas);

??????? // 繪制進度條和葉子
??????? // 之所以把葉子放在進度條里繪制，主要是層級原因
??????? drawProgressAndLeafs(canvas);
??????? // drawLeafs(canvas);

??????? canvas.drawBitmap(mOuterBitmap, mOuterSrcRect, mOuterDestRect, mBitmapPaint);

??????? postInvalidate();
??? }

??? private void drawProgressAndLeafs(Canvas canvas) {

??????? if (mProgress >= TOTAL_PROGRESS) {
??????????? mProgress = 0;
??????? }
??????? // mProgressWidth為進度條的寬度，根據當前進度算出進度條的位置
??????? mCurrentProgressPosition = mProgressWidth * mProgress / TOTAL_PROGRESS;
??????? // 即當前位置在圖中所示1范圍內
??????? if (mCurrentProgressPosition < mArcRadius) {
??????????? Log.i(TAG, "mProgress = " + mProgress + "---mCurrentProgressPosition = "
??????????????????? + mCurrentProgressPosition
??????????????????? + "--mArcProgressWidth" + mArcRadius);
??????????? // 1.繪制白色ARC，繪制orange ARC
??????????? // 2.繪制白色矩形

??????????? // 1.繪制白色ARC
??????????? canvas.drawArc(mArcRectF, 90, 180, false, mWhitePaint);

??????????? // 2.繪制白色矩形
??????????? mWhiteRectF.left = mArcRightLocation;
??????????? canvas.drawRect(mWhiteRectF, mWhitePaint);

??????????? // 繪制葉子
??????????? drawLeafs(canvas);

??????????? // 3.繪制棕色 ARC
??????????? // 單邊角度
??????????? int angle = (int) Math.toDegrees(Math.acos((mArcRadius - mCurrentProgressPosition)
??????????????????? / (float) mArcRadius));
??????????? // 起始的位置
??????????? int startAngle = 180 - angle;
??????????? // 掃過的角度
??????????? 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.繪制white RECT
??????????? // 2.繪制Orange ARC
??????????? // 3.繪制orange RECT
??????????? // 這個層級進行繪制能讓葉子感覺是融入棕色進度條中

??????????? // 1.繪制white RECT
??????????? mWhiteRectF.left = mCurrentProgressPosition;
??????????? canvas.drawRect(mWhiteRectF, mWhitePaint);
??????????? // 繪制葉子
??????????? drawLeafs(canvas);
??????????? // 2.繪制Orange ARC
??????????? canvas.drawArc(mArcRectF, 90, 180, false, mOrangePaint);
??????????? // 3.繪制orange RECT
??????????? mOrangeRectF.left = mArcRightLocation;
??????????? mOrangeRectF.right = mCurrentProgressPosition;
??????????? canvas.drawRect(mOrangeRectF, mOrangePaint);

??????? }

??? }

??? /**
???? * 繪制葉子
???? *
???? * @param 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) {
??????????????? // 繪制葉子－－根據葉子的類型和當前時間得出葉子的（x，y）
??????????????? getLeafLocation(leaf, currentTime);
??????????????? // 根據時間計算旋轉角度
??????????????? canvas.save();
??????????????? // 通過Matrix控制葉子旋轉
??????????????? 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);
??????????????? // 通過時間關聯旋轉角度，則可以直接通過修改LEAF_ROTATE_TIME調節葉子旋轉快慢
??????????????? float rotateFraction = ((currentTime - leaf.startTime) % mLeafRotateTime)
??????????????????????? / (float) mLeafRotateTime;
??????????????? int angle = (int) (rotateFraction * 360);
??????????????? // 根據葉子旋轉方向確定葉子旋轉角度
??????????????? 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;
??????????? }
??????? }
??? }

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運行效果：

總結

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