編輯:關於Android編程
mNavigationDrawerFragment.getView().getViewTreeObserver().addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() { });這個OnPreDrawListener需要實現OnPreDraw方法,就在這個方法中,對當前的View,進行截圖,並且高斯模糊。 首先找到根控件,並創建一個Bitmap對象來保存截圖。
private FrameLayout view; private Bitmap bitmap;對view初始化後,開始對view進行截圖,對view截圖的方式如下:
view.buildDrawingCache(); bitmap = view.getDrawingCache();這樣,bitmap中就保存了當前的view的截圖,接下來我們要對圖片進行高斯模糊,關於高斯模糊的算法,網上有很多,我就隨便貼一個(復制來的):
public static Bitmap doBlur(Bitmap sentBitmap, int radius, boolean canReuseInBitmap) { // Stack Blur v1.0 from // http://www.quasimondo.com/StackBlurForCanvas/StackBlurDemo.html // // Java Author: Mario Klingemann第一個參數為需要高斯模糊的圖片,第二個參數可以理解為模糊效果大小,第三個參數表示位圖是否可以重復使用。 好了,有了處理好的圖片,就可以設置到Drawer的背景裡了。 。。。 真的嗎? 仔細一想,當然不對,現在截的圖是整個view的圖,而我們的Drawer是慢慢側滑出來的,隨時都可能停止,所以,使用完整的圖肯定是不行的。 那麼就需要計算出截取view的圖片的位置,和設置到Drawer的位置,具體可以參考下圖:// http://incubator.quasimondo.com // created Feburary 29, 2004 // Android port : Yahel Bouaziz // http://www.kayenko.com // ported april 5th, 2012 // This is a compromise between Gaussian Blur and Box blur // It creates much better looking blurs than Box Blur, but is // 7x faster than my Gaussian Blur implementation. // // I called it Stack Blur because this describes best how this // filter works internally: it creates a kind of moving stack // of colors whilst scanning through the image. Thereby it // just has to add one new block of color to the right side // of the stack and remove the leftmost color. The remaining // colors on the topmost layer of the stack are either added on // or reduced by one, depending on if they are on the right or // on the left side of the stack. // // If you are using this algorithm in your code please add // the following line: // // Stack Blur Algorithm by Mario Klingemann Bitmap bitmap; if (canReuseInBitmap) { bitmap = sentBitmap; } else { bitmap = sentBitmap.copy(sentBitmap.getConfig(), true); } if (radius < 1) { return (null); } int w = bitmap.getWidth(); int h = bitmap.getHeight(); int[] pix = new int[w * h]; bitmap.getPixels(pix, 0, w, 0, 0, w, h); int wm = w - 1; int hm = h - 1; int wh = w * h; int div = radius + radius + 1; int r[] = new int[wh]; int g[] = new int[wh]; int b[] = new int[wh]; int rsum, gsum, bsum, x, y, i, p, yp, yi, yw; int vmin[] = new int[Math.max(w, h)]; int divsum = (div + 1) >> 1; divsum *= divsum; int dv[] = new int[256 * divsum]; for (i = 0; i < 256 * divsum; i++) { dv[i] = (i / divsum); } yw = yi = 0; int[][] stack = new int[div][3]; int stackpointer; int stackstart; int[] sir; int rbs; int r1 = radius + 1; int routsum, goutsum, boutsum; int rinsum, ginsum, binsum; for (y = 0; y < h; y++) { rinsum = ginsum = binsum = routsum = goutsum = boutsum = rsum = gsum = bsum = 0; for (i = -radius; i <= radius; i++) { p = pix[yi + Math.min(wm, Math.max(i, 0))]; sir = stack[i + radius]; sir[0] = (p & 0xff0000) >> 16; sir[1] = (p & 0x00ff00) >> 8; sir[2] = (p & 0x0000ff); rbs = r1 - Math.abs(i); rsum += sir[0] * rbs; gsum += sir[1] * rbs; bsum += sir[2] * rbs; if (i > 0) { rinsum += sir[0]; ginsum += sir[1]; binsum += sir[2]; } else { routsum += sir[0]; goutsum += sir[1]; boutsum += sir[2]; } } stackpointer = radius; for (x = 0; x < w; x++) { r[yi] = dv[rsum]; g[yi] = dv[gsum]; b[yi] = dv[bsum]; rsum -= routsum; gsum -= goutsum; bsum -= boutsum; stackstart = stackpointer - radius + div; sir = stack[stackstart % div]; routsum -= sir[0]; goutsum -= sir[1]; boutsum -= sir[2]; if (y == 0) { vmin[x] = Math.min(x + radius + 1, wm); } p = pix[yw + vmin[x]]; sir[0] = (p & 0xff0000) >> 16; sir[1] = (p & 0x00ff00) >> 8; sir[2] = (p & 0x0000ff); rinsum += sir[0]; ginsum += sir[1]; binsum += sir[2]; rsum += rinsum; gsum += ginsum; bsum += binsum; stackpointer = (stackpointer + 1) % div; sir = stack[(stackpointer) % div]; routsum += sir[0]; goutsum += sir[1]; boutsum += sir[2]; rinsum -= sir[0]; ginsum -= sir[1]; binsum -= sir[2]; yi++; } yw += w; } for (x = 0; x < w; x++) { rinsum = ginsum = binsum = routsum = goutsum = boutsum = rsum = gsum = bsum = 0; yp = -radius * w; for (i = -radius; i <= radius; i++) { yi = Math.max(0, yp) + x; sir = stack[i + radius]; sir[0] = r[yi]; sir[1] = g[yi]; sir[2] = b[yi]; rbs = r1 - Math.abs(i); rsum += r[yi] * rbs; gsum += g[yi] * rbs; bsum += b[yi] * rbs; if (i > 0) { rinsum += sir[0]; ginsum += sir[1]; binsum += sir[2]; } else { routsum += sir[0]; goutsum += sir[1]; boutsum += sir[2]; } if (i < hm) { yp += w; } } yi = x; stackpointer = radius; for (y = 0; y < h; y++) { // Preserve alpha channel: ( 0xff000000 & pix[yi] ) pix[yi] = (0xff000000 & pix[yi]) | (dv[rsum] << 16) | (dv[gsum] << 8) | dv[bsum]; rsum -= routsum; gsum -= goutsum; bsum -= boutsum; stackstart = stackpointer - radius + div; sir = stack[stackstart % div]; routsum -= sir[0]; goutsum -= sir[1]; boutsum -= sir[2]; if (x == 0) { vmin[y] = Math.min(y + r1, hm) * w; } p = x + vmin[y]; sir[0] = r[p]; sir[1] = g[p]; sir[2] = b[p]; rinsum += sir[0]; ginsum += sir[1]; binsum += sir[2]; rsum += rinsum; gsum += ginsum; bsum += binsum; stackpointer = (stackpointer + 1) % div; sir = stack[stackpointer]; routsum += sir[0]; goutsum += sir[1]; boutsum += sir[2]; rinsum -= sir[0]; ginsum -= sir[1]; binsum -= sir[2]; yi += w; } } bitmap.setPixels(pix, 0, w, 0, 0, w, h); return (bitmap); }
int[] location = new int[2]; mNavigationDrawerFragment.getView().getLocationInWindow(location); blur(bitmap, listView, location[0]);//只傳x坐標blur函數就是我們處理位置的細節了,傳的listView是Fragment裡的唯一一個view:
private void blur(Bitmap bkg, View view,int width) { float scaleFactor = 4;//縮放圖片,縮放之後模糊效果更好 float radius = 2; Bitmap overlay = Bitmap.createBitmap((int) (view.getMeasuredWidth()/scaleFactor), (int) (view.getMeasuredHeight()/scaleFactor), Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(overlay); canvas.translate(-view.getLeft()/scaleFactor, -view.getTop()/scaleFactor); canvas.scale(1 / scaleFactor, 1 / scaleFactor); Paint paint = new Paint(); paint.setFlags(Paint.FILTER_BITMAP_FLAG); float visibleWidth = slideMenuWidth +width;//可見寬 int visibleHeight = view.getHeight();//可見高 //從view的截圖中截取的區域,+10和下面-10的原因是,高斯模糊的邊有時會有黑影,所以增大模糊區域 Rect src = new Rect(0,0, (int)(visibleWidth)+10, visibleHeight); RectF dest = new RectF(-width - 10, 0, slideMenuWidth, visibleHeight);//設置Drawer背景的區域 canvas.drawBitmap(bkg, src, dest, paint); overlay = ImageUtils.doBlur(overlay, (int)radius, true);//進行高斯模糊操作 if (Build.VERSION.SDK_INT < 16) {//16level以前使用這個方法,在16中被廢棄 view.setBackgroundDrawable(new BitmapDrawable(getResources(), overlay)); } else { view.setBackground(new BitmapDrawable(getResources(), overlay)); } }整個的事件監聽代碼如下:
mNavigationDrawerFragment.getView().getViewTreeObserver().addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() { @Override public boolean onPreDraw() { if (bitmap == null) { view.buildDrawingCache(); bitmap = view.getDrawingCache(); } int[] location = new int[2]; mNavigationDrawerFragment.getView().getLocationInWindow(location); blur(bitmap, listView, location[0]);//只傳x坐標 return true; } });到這裡,側滑菜單的毛玻璃效果就已經完成了。
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