概述
先看下效果图:
仔细观察上图,我们可以发现,背景图以用户头像为模板,对其进行了高斯模糊,并把它作为整个页面的背景色。
关于Android如何快速实现高斯模糊(毛玻璃效果),网上一堆相关介绍, 下面直接给出网上模糊化工具类(已验证可行):
import android.graphics.Bitmap; /** * 快速模糊化工具 */ public class FastBlur { public static Bitmap doBlur(Bitmap sentBitmap, int radius, boolean canReuseInBitmap) { 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); } }
那么,我们使用这个工具类,就可以高仿微信聊天页面了么?答案是NO。
我们先看下直接使用该工具类能实现的效果:
我们可以看出来,通过该工具类,能实现图片的毛玻璃效果,可是并不理想,因为微信的背景颜色偏暗,而我们模糊化得到的图片颜色偏淡。效果有些不尽如人意。了解ios的人,或许知道,ios实现高斯模糊有直接的api:UIBlurEffectStyleExtraLight、UIBlurEffectStyleLight 、UIBlurEffectStyleDark,而UIBlurEffectStyleDark就可以直接实现比较暗的毛玻璃效果。那放在android这边,该如何办呢?
我这里采用的是“曲线求国”的策略,要想背景色偏暗,我们使用FrameLayout布局,在其中添加一个比较暗的一层View,就可以实现啦。
<?xml version="1.0" encoding="utf-8"?> <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:fitsSystemWindows="true" android:orientation="vertical"> <ImageView android:id="@+id/imgBg" android:layout_width="match_parent" android:layout_height="match_parent" android:adjustViewBounds="true" android:maxHeight="1500dp" android:maxWidth="1000dp" android:scaleType="centerCrop" /> <ImageView android:layout_width="match_parent" android:layout_height="match_parent" android:background="#90000000" /> <RelativeLayout android:id="@+id/rootView" android:layout_width="match_parent" android:layout_height="match_parent" android:fitsSystemWindows="true" android:orientation="vertical"> <ImageView android:id="@+id/imgUserHead" android:layout_width="100dp" android:layout_height="100dp" android:layout_centerHorizontal="true" android:layout_marginTop="80dp" android:scaleType="fitXY" android:src="@mipmap/ic_launcher" /> <TextView android:id="@+id/textUserName" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/imgUserHead" android:layout_centerHorizontal="true" android:layout_marginTop="30dp" android:gravity="center_horizontal" android:text="静音" android:textColor="#ffffff" android:textSize="24dp" /> </RelativeLayout> </FrameLayout>
上面代码中,可以看到,我们添加了这么一个ImageView:
<ImageView android:layout_width="match_parent" android:layout_height="match_parent" android:background="#90000000" />
如此这般,便是可以实现真正的高仿啦。
最重实现的效果图如下:
源码地址:
https://github.com/zuiwuyuan/FastBlur_VoiceChat
到这里就结束啦。
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