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Im searching for a way to pas a List between two activity and I found 2 ways perefering the faster one Parcelable but every page I read can not found how to convert my list to Parcelable or initialize initialize with my list values or how to recieve the list in second activity can anyone =new a tutorial's link or code the Parcelable class and the section of sending intent in first and recieving in second activity tnx notice: its a List not Arraylist

Let's assume you've developed a hinge joint! =) Actually there could be several issues. E.g: when you check for a free space, another circle can already occupy it; I think that scenario is next: lets assume that two circles have 

r=1; y =0;
circle1.x = 1, circle2.x =4;

checking next step:

circle1.canMoveToX(2) //=> true; coz border will move to x=3 it's empty at the moment;
circle2.canMoveToX(3)  // => true; coz border will move to x=2 it's empty at the moment;

and at this step they join.

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