图片模糊

• 图片模糊代码：

  public class BlurBitmap {
      private static final float BITMAP_SCALE = 0.4f;
  
      private static final float BLUR_RADIUS = 25f;
  
      public static Bitmap blur(Context context, Bitmap image){
          int width = Math.round(image.getWidth() * BITMAP_SCALE);
          int height = Math.round(image.getHeight() * BITMAP_SCALE);
  
          Bitmap inputBitmap = Bitmap.createScaledBitmap(image, width, height, false);
          Bitmap outputBitmap = Bitmap.createBitmap(inputBitmap);
  
          RenderScript renderScript = RenderScript.create(context);
  
          ScriptIntrinsicBlur scriptIntrinsicBlur = ScriptIntrinsicBlur.create(renderScript, Element.U8_4(renderScript));
  
          Allocation tmpIn = Allocation.createCubemapFromBitmap(renderScript, inputBitmap);
          Allocation tmpOut = Allocation.createCubemapFromBitmap(renderScript, outputBitmap);
  
          scriptIntrinsicBlur.setRadius(BLUR_RADIUS);
          scriptIntrinsicBlur.setInput(tmpIn);
          scriptIntrinsicBlur.forEach(tmpOut);
  
          tmpOut.copyTo(outputBitmap);
  
          return outputBitmap;
      }
  }