我想在
ImageView中添加模糊动画,但设置持续时间.所以,例如,我希望图像随着时间的推移而模糊.
我已经有了模糊图像的方法,但我需要的是让它从模糊变为无模糊,比如2秒.
有人可以帮帮我吗？
编辑：这是我目前模糊图像的方法.
public Bitmap blur(Bitmap sentBitmap,int radius) {
// Stack Blur Algorithm by Mario Klingemann <mario@quasimondo.com>
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];
Log.e("pix",w + " " + h + " " + pix.length);
bitmap.getPixels(pix,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;
}
}
Log.e("pix",w + " " + h + " " + pix.length);
bitmap.setPixels(pix,h);
return (bitmap);
}
解决方法
Android上的模糊效果总是很难.基本上你必须在外观和性能之间做出决定.模糊看起来越长越好,如果模糊本身不是瞬间的,那么你就无法真正为模糊设置动画.
你原始的模糊算法产生了非常好的结果,但由于这一点,它也很慢,使模糊动画不可能.为了演示如何有效地模糊这个图像,我通过缩放位图来创建一个简单的模糊动画：
public class BlurAnimation extends Animation {
private final ImageView imageView;
private final Bitmap bitmap;
private final float startValue;
private final float stopValue;
private final float difValue;
private BlurAnimation(ImageView imageView,Bitmap bitmap,int startValue,int stopValue) {
this.imageView = imageView;
this.bitmap = bitmap;
this.startValue = startValue;
this.stopValue = stopValue;
this.difValue = stopValue - startValue;
}
@Override
protected void applyTransformation(float interpolatedTime,Transformation t) {
super.applyTransformation(interpolatedTime,t);
int current = (int)(this.difValue * interpolatedTime + this.startValue + 0.5f);
Bitmap blurred = quickBlur(this.bitmap,current);
this.imageView.setImageBitmap(blurred);
}
public Bitmap quickBlur(Bitmap bitmap,int factor) {
if(factor <= 0) {
return Bitmap.createBitmap(1,1,Bitmap.Config.ARGB_8888);
}
return Bitmap.createScaledBitmap(bitmap,bitmap.getWidth() / factor,bitmap.getHeight() / factor,true);
}
}
这很有效(即使仍有一些滞后),但结果无法与您的模糊算法进行比较,它看起来很糟糕：
所以你看,在模糊图像时很难将性能和美观结合起来,但有一些选项首先是RenderScript. RenderScript速度非常快,并且内置高斯模糊滤镜.我从来没有使用它,但从我听到它可能是你的问题的解决方案.
您还可以尝试加载图像的已缩小版本,这将产生与上面的gif相同的效果,但会更快.缺点是在动画中使用它也是有问题的,但是如果你只是需要一个模糊的图像而你并不真正关心质量,那么你应该选择这个选项.
您可以找到有关RenderScript和其他快速模糊选项in this answer的更多信息
