Documents or Tutorials about android.graphics.Camera and android.graphics.Matrix?

Question

I know that it may be seems as not constructive or off topic question.But I ask this question after I searched more than 40 or 50 times in Google to find a good documents or tutorials in about Camera and Matrix.

I have to do 3D animation in Android by Canvas,Camera,Matrix and without Open GL.

Finally I found some examples,but they have a little description in about methods and differences between them.(Touch Controlled Cube on Samsung Galaxy S2 or Making your own 3D list).Now with no documents,every things looks like magic and I can not debug my project.

So I asked my question here:
Do you know a good tutorial or document in about using Canvas,Camera,Matrix for 3D animation?

Answer 1

finally,after some days,best resource that I found is:

Understanding Animation

But it is not complete resource.