android中毛玻璃效果主要有两种实现方式。
1.使用Java算法FastBlur实现方法1 先将图片缩小,然后放大图片,再设置为控件背景以达到更模糊的效果,同时也提升模糊算法的处理效率。2.使用Android自带类RenderScript 实现方法2 模糊半径只能设置1-25。对比下来同样的模糊半径 ,方法1 的模糊效果更好,且方法1 的模糊半径可以设置范围更大。示例代码如下:
1.activity中调用private void testImageBlur() { Log.i(TAG, "testImageBlur() 11"); Bitmap bitmapOrigin1 = getTestImage(); //1.显示原图 mImageOrigin.setImageBitmap(bitmapOrigin1); Log.i(TAG, "testImageBlur() 22 bitmapOrigin1.isRecycled:" + bitmapOrigin1.isRecycled()); final float RADIUS = 20; Bitmap bitmapOrigin2 = getTestImage(); Bitmap bitmapFastBlur = BitmapUtil.blurFastBlur(this, bitmapOrigin2, 20); //2.显示使用FastBlur处理后 高斯模糊图片 mImageFastBlurResult.setImageBitmap(bitmapFastBlur); Bitmap bitmapOrigin3 = getTestImage(); Bitmap bitmapRenderScriptBlur = BitmapUtil.blurRenderScript(this, bitmapOrigin3, 25); //3.显示 RenderScript 处理后的高斯模糊图片 mImageRenderScriptResult.setImageBitmap(bitmapRenderScriptBlur); Log.i(TAG, "testImageBlur() 33 bitmapOrigin3.isRecycled:" + bitmapOrigin3.isRecycled() + " bitmapOrigin1.isRecycled():" + bitmapOrigin1.isRecycled()); }
2.BitmapUtil.java 类
public class BitmapUtil { private static final String TAG = "BitmapUtil"; public static BitmapDrawable getConfirmDialogBg(Context context) { return getScreenBlurBg(context, 30.0f, 1676, 160, 834, 1094); } /** * 使用 获取全屏高斯模糊的图片 BitmapDrawable * * @param activity * @return */ public static BitmapDrawable getScreenBlurBg(Activity activity) { WeakReference<Bitmap> screenBitmap = new WeakReference(FastBlurUtil.takeScreenShot(activity)); Log.i(TAG, "getScreenBlurBg 00 screenBitmap:" + screenBitmap); if (null == screenBitmap) { return null; } Log.i(TAG, "getScreenBlurBg 11 screenBitmap:" + screenBitmap); long startMs = System.currentTimeMillis(); float radius = 10.0F; Bitmap bitmapSmall = small(screenBitmap.get()); Bitmap bitmapBlur = FastBlurUtil.fastBlur(bitmapSmall, radius); WeakReference<Bitmap> overlay = new WeakReference(FastBlurUtil.getDimBitmap(bitmapBlur, 0.2F)); Log.i(TAG, "getScreenBlurBg 22 =====blur time:" + (System.currentTimeMillis() - startMs)); try { if (screenBitmap.get() != null && !screenBitmap.get().isRecycled()) { screenBitmap.get().recycle(); } if (null != bitmapSmall && !bitmapSmall.isRecycled()) { bitmapSmall.recycle(); } if (null != bitmapBlur && !bitmapBlur.isRecycled()) { bitmapBlur.recycle(); } } catch (Exception e) { e.printStackTrace(); } BitmapDrawable rst = new BitmapDrawable(activity.getResources(), overlay.get()); return rst; } /** * 获取屏幕指定区域高斯模糊的图片 BitmapDrawable * * @param context * @param blurRadius 模糊半径 * @param xOffset 指定区域的左上角顶点X坐标偏移 * @param yOffset 指定区域的左上角顶点Y坐标偏移 * @param width 指定区域的宽度 * @param height 指定区域的高度 * @return */ public static BitmapDrawable getScreenBlurBg(Context context, float blurRadius, int xOffset, int yOffset, int width, int height) { Bitmap screenBitmap = FastBlurUtil.screenshot(context); if (null == screenBitmap) { return null; } Bitmap b1 = crop(screenBitmap, xOffset, yOffset, width, height); Bitmap overlay = FastBlurUtil.fastBlur(bitmapMergeWithColor(b1), blurRadius); // Bitmap overlay = FastBlurUtility.getDimBitmap(FastBlurUtility.fastBlur(small(bitmapMerge(b1, b2)), radius), 0.2F); BitmapDrawable rst = new BitmapDrawable(context.getResources(), getRoundedCornerBitmap(overlay)); return rst; } /** * 在给定的bitmap中剪裁指定区域 * * @param source * @param xOffset 指定区域的左上角顶点X坐标偏移 * @param yOffset 指定区域的左上角顶点Y坐标偏移 * @param width 指定区域的宽度 * @param height 指定区域的高度 * @return */ public static Bitmap crop(Bitmap source, int xOffset, int yOffset, int width, int height) { return Bitmap.createBitmap(souTIeEDxrce, xOffset, yOffset, width, height); } /** * 缩小bitmap,可以使用此方法先将图片缩小,再设置为控件背景以达到更模糊的效果 * * @param bitmap * @return */ private static Bitmap small(Bitmap bitmap) { Matrix matrix = new Matrix(); matrix.postScale(0.25F, 0.25F); Bitmap resizeBmp = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true); return resizeBmp; } /** * 图片圆角化 * * @param bitmap * @return */ public static Bitmap getRoundedCornerBitmap(Bitmap bitmap) { final float roundPx = 24f; Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap .getHeight(), Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(output); final int color = 0xFFFFFFFF; final Paint paint = new Paint(); final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight()); final RectF rectF = new RectF(rect); paint.setAntiAlias(true); canvas.drawARGB(0, 0, 0, 0); paint.setColor(color); canvas.drawRoundRect(rectF, roundPx, roundPx, paint); paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN)); canvas.drawBitmap(bitmap, rect, rect, paint); return output; } /** * 将bitmap与指定颜色混合 * * @param b1 * @return */ private static Bitmap bitmapMergeWithColor(Bitmap b1) { if (!b1.isMutable()) { b1 = b1.copy(Bitmap.Config.ARGB_8888, true); } Canvas canvas = new Canvas(b1); canvas.drawARGB(79, 255, 255, 255); canvas.save(); canvas.restore(); return b1; } /** * 使用 fastBlur 接口实现高斯模糊效果 * * @param context * @param orginBitmap 需要做模糊效果的原始 bitmap * @param radius 模糊半径 * @return 模糊后的bitmap */ public static Bitmap blurFastBlur(Context context, Bitmap orginBitmap, float radius) { Log.i(TAG, "getScreenBlurBg 00 orginBitmap:" + orginBitmap); if (null == orginBitmap) { return null; } Log.i(TAG, "getScreenBlurBg 11 orginBitmap:" + orginBitmap); long startMs = System.currentTimeMillis(); //先将图片缩小,再设置为控件背景以达到更模糊的效果,同时也提升模糊算法的处理效率 Bitmap bitmapSmall = small(orginBitmap); Bitmap bitmapBlur = FastBlurUtil.fastBlur(bitmapSmall, radius); WeakReference<Bitmap> overlay = new WeakReference(FastBlurUtil.getDimBitmap(bitmapBlur, 0.2F)); //WeakReference<Bitmap> overlay = new WeakReference(bitmapBlur); Log.i(TAG, "getScreenBlurBg 22 =====blur time:" + (System.currentTimeMillis() - startMs)); try { if (orginBitmap != null && !orginBitmap.isRecycled()) { orginBitmap.recycle(); } if (null != bitmapSmall && !bitmapSmall.isRecycled()) { bitmapSmall.recycle(); } if (null != bitmapBlur && !bitmapBlur.isRecycled()) { bitmapBlur.recycle(); } } catch (Exception e) { e.printStackTrace(); } return overlay.get(); } /** * 使用Android自带 RenderScript 接口实现高斯模糊效果 * * @param context * @param smallBitmap 需要做模糊效果的bitmap * @param radius 模糊半径 * @return 模糊后的bitmap */ public static Bitmap blurRenderScript(Context context, Bitmap smallBitmap, float radius) { // Create a new bitmap that is a copy of the original bitmap Bitmap bitmap = smallBitmap.copy(Bitmap.Config.ARGB_8888, true); // Initialize RenderScript RenderScript rs = RenderScript.create(context); // Create an empty allocation that will hold the original bitmap Allocation input = Allocation.createFromBitmap(rs, bitmap, Allocation.MipmapControl.MIPMAP_FULL, Allocation.USAGE_SHARED); // Create an empty allocation that will hold the blurred bitmap Allocation output = Allocation.createTyped(rs, input.getType()); // Load the script in the Allocation ScriptIntrinsicBlur script = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs)); script.setInput(input); // Set the blur radius //float radius = 20f; // 20 works well for me // Start the Script Intrinsic Blur script.setRadius(radius); script.forEach(output); // Copy the script result into the blurred bitmap output.copyTo(bitmap); // Recycle the original bitmap smallBitmap.recycle(); // After all of this, we can return the now-blurred bitmap return bitmap; } }
3.FastBlurUtil.java 类
public class FastBlurUtil { public FastBlurUtil() { } public static Bitmap getBlurBackgroundDrawer(Context context) { Bitmap bmp = screenshot(context); return startBlurBackground(bmp); } public static Bitmap screenshot(Context context) { int[] dim = new int[]{ScreenUtils.getScwww.devze.comreenWidth(context), ScreenUtils.getScreenHeight(context)}; String surfaceClassName = ""; if (VERSION.SDK_INT <= 17) { surfaceClassName = "android.view.Surface"; } else { surfaceClassName = "android.view.SurfaceControl"; } try { Class<?> c = Class.forName(surfaceClassName); Method method = c.getMethod("screenshot", Rect.class, Integer.TYPE, Integer.TYPE, Integer.TYPE); method.setAccessible(true); Bitmap bitmap = (Bitmap)method.invoke((Object)null, new Rect(0, 0, dim[0], dim[1]), dim[0], dim[1], 0); if(null == bitmap){ return null; } bitmap = bitmap.copy(Config.ARGB_8888, true); return bitmap; } catch (NoSuchMethodException | InvocationTargetException | ClassNotFoundException | IllegalAccessException var6) { var6.printStackTrace(); return null; } } public static Bitmap takeScreenShot(Activity activity) { View view = activity.getWindow().getDecorView(); view.setDrawingCacheEnabled(true); view.buildDrawingCache(); Bitmap b1 = view.getDrawingCache(); int width = activity.getResources().getDisplayMetrics().widthPixels; int height = activity.getResources().getDisplayMetrics().heightPixels + getNavigationBarOffset(activity); Bitmap bmp = Bitmap.createBitmap(b1, 0, 0, width, height); view.destroyDrawingCache(); return bmp; } @RequiresApi( api = 26 ) private static Bitmap startBlurBackground(Bitmap bkg) { long startMs = System.currentTimeMillis(); float radius = 10.0F; Bitmap overlay = getDimBitmap(fastBlur(small(bkg), radius), 0.2F); Log.i("FastBlurUtility", "=====blur time:" + (System.currentTimeMillis() - startMs)); return overlay; } private static Bitmap big(Bitmap bitmap) { Matrix matrix = new Matrix(); matrix.postScale(4.0F, 4.0F); Bitmap resizeBmp = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true); return resizeBmp; } private static Bitmap small(Bitmap bitmap) { Matrix matrix = new Matrix(); matrix.postScale(0.25F, 0.25F); Bitmap resizeBmp = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true); return resizeBmp; } private static int getStatusBarHeight(Activity activity) { int result = 0; int resourceId = activity.getResources().getIdentifier("status_bar_height", "dimen", "android"); if (resourceId > 0) { result = activity.getResources().getDimensionPixelSize(resourceId); } return result; } private static int getNavigationBarOffset(Activity activity) { int result = 0; Resources resources = activity.getResources(); if (VERSION.SDK_INT >= 21) { int resourceId = resources.getIdentifier("navigation_bar_height", "dimen", "android"); if (resourceId > 0) { result = resources.getDimensionPixelSize(resourceId); } } return result; } /** * 每个像素设置模糊效果 * @param bitmap 原图 * @param radiusf 模糊半径 * @return 模糊处理后的效果图 */ public static Bitmap fastBlur(Bitmap bitmap, float radiusf) { if (bitmap == null) { return null; } else { int radius = (int)radiusf; if (radius < 1) { return null; } else { 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[] vmin = new int[Math.max(w, h)]; int divsum = div + 1 >> 1; divsum *= divsum; int[] dv = new int[256 * divsum]; int i; for(i = 0; i < 256 * divsum; ++i) { dv[i] = i / divsum; } int yi = 0; int yw = 0; int[][] stack = new int[div][3]; int r1 = radius + 1; int rsum; int gsum; int bsum; int x; int y; int p; int stackpointer; int stackstart; int[] sir; int rbs; int routsum; int goutsum; int boutsum; int rinsum; int ginsum; int binsum; for(y = 0; y < h; ++y) { bsum = 0; gsum = 0; rsum = 0; boutsum = 0; goutsum = 0; routsum = 0; binsum = 0; ginsum = 0; rinsum = 0; for(i = -radius; i <= radius; ++i) { p = pix[yi + Math.min(wm, Math.max(i, 0))]; sir = stack[i + radius]; sir[0] = (p & 16711680) >> 16; sir[1] = (p & '\uff00') >> 8; sir[2] = p & 255; 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 & 16711680) >> 16; sir[1] = (p & '\uff00') >> 8; sir[2] = p & 255; 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) { bsum = 0; gsum = 0; rsum = 0; boutsum = 0; goutsum = 0; routsum = 0; binsum = 0; ginsum = 0; rinsum = 0; int 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; 编程客栈 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) { pix[yi] = -16777216 & 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; } www.devze.com 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; } } } @RequiresApi( api = 26 ) public static Bitmap getDimBitmap(Bitmap background, float dimAmount) { if (background == null) { return null; } else { int bgWidth = background.getWidth(); int bgHeight = background.getHeight(); Bitmap newbmp = Bitmap.createBitmap(bgWidth, bgHeight, Config.ARGB_8888); Cajavascriptnvas cv = new Canvas(newbmp); cv.drawBitmap(background, 0.0F, 0.0F, (Paint)null); cv.drawColor(Color.argb(dimAmount, 0.0F, 0.0F, 0.0F)); cv.save(); cv.restore(); return newbmp; } } }
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