This is the same idea behind binary search. In a sorted array, you compare against the middle element and eliminate half the remaining candidates. In a quadtree, you choose one of four quadrants and ignore the other three regions. Each level narrows the search space by a factor of four instead of two.
Android has historically been characterized as an open platform where users and developers can operate independently of Google’s services. The proposed developer registration policy fundamentally alters that relationship by requiring developers who wish to distribute apps through alternative channels — their own websites, third-party app stores, enterprise distribution systems, or direct transfers — to first seek permission from Google through a mandatory verification process, which involves the agreement to Google’s terms and conditions, the payment of a fee, and the uploading of government-issued identification.
，更多细节参见夫子
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