Android ImageView模糊动画

概述我想在 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 M 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

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