Android毛玻璃模糊化效果处理 _android

春衣少年当酒歌，起舞四顾以笑和。这篇文章主要讲述Android毛玻璃模糊化效果处理相关的知识，希望能为你提供帮助。
三种方法
第一种：比较简单，性能比较低
/**
* 通过调用系统高斯模糊api的方法模糊
*
* @param bitmap source bitmap
* @param radius 0 < radius < = 25
* @param context context
* @return out bitmap
*/
public static Bitmap blurBitmap(Bitmap bitmap, float radius, Context context) {
//Let\'s create an empty bitmap with the same size of the bitmap we want to blur
Bitmap outBitmap = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(),
Bitmap.Config.ARGB_8888);

//Instantiate a new Renderscript
android.renderscript.RenderScript rs = android.renderscript.RenderScript.create(context);

//Create an Intrinsic Blur Script using the Renderscript
android.renderscript.ScriptIntrinsicBlur blurScript = android.renderscript.ScriptIntrinsicBlur.create(rs, Element.U8_4(rs));

//Create the Allocations (in/out) with the Renderscript and the in/out bitmaps
android.renderscript.Allocation allIn = android.renderscript.Allocation.createFromBitmap(rs, bitmap);
android.renderscript.Allocation allOut = android.renderscript.Allocation.createFromBitmap(rs, outBitmap);

//Set the radius of the blur
blurScript.setRadius(radius);

//Perform the Renderscript
blurScript.setInput(allIn);
blurScript.forEach(allOut);

//Copy the final bitmap created by the out Allocation to the outBitmap
allOut.copyTo(outBitmap);

//recycle the original bitmap
// bitmap.recycle();

//After finishing everything, we destroy the Renderscript.
// view.setBackground(new BitmapDrawable(context.getResources(), outBitmap));
rs.destroy();

return outBitmap;
}
第二种：性能比第一种要高
/**
*@param
*@描述快速模糊化处理bitmap
*@作者 tll
*@时间 2016/12/5 19:22
*/
public static Bitmap fastblur(Bitmap sentBitmap, int radius) {

Bitmap 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 temp = 256 * divsum;
int dv[] = new int[temp];
for (i = 0; i < temp; 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++) {
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);
}
第三种是利用开源框架实现，框架地址：https://github.com/500px/500px-android-blur，可以直接将jar包项目下载下来导入到自己项目中。
在gradle中添加

dependencies {
compile project(\':blurringview\')

settings.gradle增加

include \':app\', \':blurringview\'

使用

mBlurringView = (BlurringView) findViewById(R.id.blurring_view);
View blurredView = findViewById(R.id.blurred_view);
// Give the blurring view a reference to the blurred view.
mBlurringView.setBlurredView(blurredView);

有更新时需要调用
mBlurringView.invalidate();