title: How to get Android Render Script Group work?
body: <p>I can get two separate intrinsics working, but not together in a ScriptGroup. I found document on how to use Script Group is extremely sparse.</p>
  
  <p>Here is my code:</p>
  
  <pre><code>mRS = RenderScript.create(getActivity());
  
  mInAllocation = Allocation.createFromBitmap(mRS, mBitmapIn,
          Allocation.MipmapControl.MIPMAP_NONE,
          Allocation.USAGE_SCRIPT |
                  Allocation.USAGE_GRAPHICS_TEXTURE |
                  Allocation.USAGE_SHARED);
  
  mOutAllocation = Allocation.createFromBitmap(mRS, mBitmapOut,
          Allocation.MipmapControl.MIPMAP_NONE,
          Allocation.USAGE_SCRIPT |
                  Allocation.USAGE_SHARED);
  
  ScriptIntrinsicColorMatrix gray = ScriptIntrinsicColorMatrix.create(mRS, Element.U8_4(mRS));
  gray.setGreyscale();
  
  ScriptIntrinsicBlur blur = ScriptIntrinsicBlur.create(mRS, Element.U8_4(mRS));
  blur.setRadius(20.f);
  blur.setInput(mInAllocation);
  
  //gray.forEach(mInAllocation, mOutAllocation);
  blur.forEach(mOutAllocation);
  
  mOutAllocation.copyTo(mBitmapOut);
  </code></pre>
  
  <p>Both gray and blur work. And then I tried putting them together, the result is blank. Code:</p>
  
  <pre><code>// gray.forEach(mInAllocation, mOutAllocation);
  // blur.forEach(mOutAllocation);
  // mOutAllocation.copyTo(mBitmapOut);
  
  ScriptGroup.Builder builder = new ScriptGroup.Builder(mRS);
  builder.addKernel(gray.getKernelID());
  builder.addKernel(blur.getKernelID());
  builder.addConnection(mInAllocation.getType(), gray.getKernelID(), blur.getKernelID());
  
  ScriptGroup group = builder.create();
  group.setInput(gray.getKernelID(), mInAllocation);
  group.setOutput(blur.getKernelID(), mOutAllocation);
  group.execute();
  
  mOutAllocation.copyTo(mBitmapOut);
  </code></pre>