Android仿微信通话背景的高斯模糊效果

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。

以上就是Android仿微信通话背景的高斯模糊效果的详细内容,更多关于Android 高斯模糊效果的资料请关注其它相关文章!

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