Android实现图片转高斯模糊以及高斯模糊布局

第一个为大家介绍图片如何转高斯模拟：

1.方法的实现:

public static void updateBgToBlur(Activity a, Bitmap bmpToBlur, View view, int resId) {
   BitmapFactory.Options opt = new BitmapFactory.Options();
   opt.inJustDecodeBounds = true;
   opt.inSampleSize = 8;
   opt.inJustDecodeBounds = false;
   Bitmap bmp = BitmapFactory.decodeResource(a.getResources(), resId, opt);
   if (Build.VERSION.SDK_INT > Build.VERSION_CODES.JELLY_BEAN) {
     view.setBackground(null);
   } else {
     view.setBackgroundDrawable(null);
   }
   if (bmpToBlur != null && !bmpToBlur.isRecycled()) {
     bmpToBlur.recycle();
   }
   bmpToBlur = blurBitmap(a, bmp);
   if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
     view.setBackground(new BitmapDrawable(a.getResources(), bmpToBlur));
   } else {
     view.setBackgroundDrawable(new BitmapDrawable(a.getResources(), bmpToBlur));
   }
 }

public static Bitmap blurBitmap(Context c, Bitmap bitmap) {

//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_4444);

//Instantiate a new Renderscript
   RenderScript rs = RenderScript.create(c.getApplicationContext());

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

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

//Set the radius of the blur
   blurScript.setRadius(25.f);

//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.
   rs.destroy();

return outBitmap;
 }

2 调用:

Bitmap bitmap=null;
   if (Build.VERSION.SDK_INT > Build.VERSION_CODES.KITKAT) {
     ImageUtil.updateBgToBlur(getActivity(), bitmap, slidingUpPanelLayout, R.drawable.bg_tageditor);
   } else {
     slidingUpPanelLayout.setBackgroundResource(R.drawable.bg_tageditor);
   }

二、高斯模糊布局:

项目需求: 现有一个紫色背景图片, 相册图片覆盖在背景图片 , 一个Framlayout 覆盖在这个含有相册图片的背景图中 ,实现模糊盖在上面的高斯模拟效果:

1 引用BlurView:

compile 'com.eightbitlab:supportrenderscriptblur:1.0.0'
compile 'com.eightbitlab:blurview:1.3.3'

defaultConfig {
   renderscriptTargetApi 25 //must match target sdk and build tools, 23+
   renderscriptSupportModeEnabled true
}

2 .调用:

final float radius = 20;

final View decorView = getActivity().getWindow().getDecorView();
   //Activity's root View. Can also be root View of your layout (preferably)
   final ViewGroup rootView = (ViewGroup) decorView.findViewById(android.R.id.content);
   //set background, if your root layout doesn't have one
   final Drawable windowBackground = decorView.getBackground();

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
     mBlurView.setupWith(rootView)
         .windowBackground(windowBackground)
         .blurAlgorithm(new RenderScriptBlur(getActivity()))
         .blurRadius(radius);
   }else {
     mBlurView.setupWith(rootView)
         .windowBackground(windowBackground)
         .blurAlgorithm(new SupportRenderScriptBlur(getActivity()))
         .blurRadius(radius);
   }

3 xml

<eightbitlab.com.blurview.BlurView
  android:id="@+id/blurView"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  app:blurOverlayColor="@color/colorOverlay">

<!--Any child View here, TabLayout for example-->

</eightbitlab.com.blurview.BlurView>