如何在Android Studio中设置模糊图像从url加载

Question

我有一个链接是图像。现在我想加载这个图像并在Android Studio的图像中模糊它。

这是我的班。这是从url模糊它，但它失败。

private void blurBackGround() { 
    try { 
     URL url = new URL(dmMember.getMemberImage()); 
     Bitmap image = BitmapFactory.decodeStream(url.openConnection().getInputStream()); 
     Bitmap blurredBitmap = blur(image); 
     imageView.setImageBitmap(blurredBitmap); 
    } catch(IOException e) { 
     System.out.println(e); 
    } 

} 

这是模糊图像

@SuppressLint("NewApi") 
public Bitmap blur(Bitmap image) { 
    if (null == image) return null; 

    Bitmap outputBitmap = Bitmap.createBitmap(image); 
    final RenderScript renderScript = RenderScript.create(this); 
    Allocation tmpIn = Allocation.createFromBitmap(renderScript, image); 
    Allocation tmpOut = Allocation.createFromBitmap(renderScript, outputBitmap); 

    //Intrinsic Gausian blur filter 
    @SuppressLint({"NewApi", "LocalSuppress"}) ScriptIntrinsicBlur theIntrinsic = ScriptIntrinsicBlur.create(renderScript, Element.U8_4(renderScript)); 
    theIntrinsic.setRadius(BLUR_RADIUS); 
    theIntrinsic.setInput(tmpIn); 
    theIntrinsic.forEach(tmpOut); 
    tmpOut.copyTo(outputBitmap); 
    return outputBitmap; 
} 

Answer 1

有一个解决方案已经在这里：https://stackoverflow.com/a/10028267/842607

他用盒子模糊和高斯模糊。以下是供参考的代码，以防万一链接消失

/** 
* Stack Blur v1.0 from 
* http://www.quasimondo.com/StackBlurForCanvas/StackBlurDemo.html 
* Java Author: Mario Klingemann <mario at quasimondo.com> 
* http://incubator.quasimondo.com 
* 
* created Feburary 29, 2004 
* Android port : Yahel Bouaziz <yahel at kayenko.com> 
* http://www.kayenko.com 
* ported april 5th, 2012 
* 
* This is a compromise between Gaussian Blur and Box blur 
* It creates much better looking blurs than Box Blur, but is 
* 7x faster than my Gaussian Blur implementation. 
* 
* I called it Stack Blur because this describes best how this 
* filter works internally: it creates a kind of moving stack 
* of colors whilst scanning through the image. Thereby it 
* just has to add one new block of color to the right side 
* of the stack and remove the leftmost color. The remaining 
* colors on the topmost layer of the stack are either added on 
* or reduced by one, depending on if they are on the right or 
* on the left side of the stack. 
* 
* If you are using this algorithm in your code please add 
* the following line: 
* Stack Blur Algorithm by Mario Klingemann <mario@quasimondo.com> 
*/ 

public Bitmap fastblur(Bitmap sentBitmap, float scale, int radius) { 

    int width = Math.round(sentBitmap.getWidth() * scale); 
    int height = Math.round(sentBitmap.getHeight() * scale); 
    sentBitmap = Bitmap.createScaledBitmap(sentBitmap, width, height, false); 

    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, 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; 
     } 
    } 

    Log.e("pix", w + " " + h + " " + pix.length); 
    bitmap.setPixels(pix, 0, w, 0, 0, w, h); 

    return (bitmap); 
}