1<!-- 2 Copyright 2010 The Android Open Source Project 3 4 Licensed under the Apache License, Version 2.0 (the "License"); 5 you may not use this file except in compliance with the License. 6 You may obtain a copy of the License at 7 8 http://www.apache.org/licenses/LICENSE-2.0 9 10 Unless required by applicable law or agreed to in writing, software 11 distributed under the License is distributed on an "AS IS" BASIS, 12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 See the License for the specific language governing permissions and 14 limitations under the License. 15--> 16 17# Philosophy and Goals # 18 19Android is an open-source software stack for mobile phones and other 20devices. 21 22## Origin and Goal ## 23 24Android was originated by a group of companies known as the Open Handset 25Alliance, led by Google. Today, many companies -- both original members of the 26OHA and others -- have invested heavily in Android, typically in the form of 27allocating significant engineering resources to improve Android and bring 28Android devices to Market. 29 30We created Android in response to our own experiences launching mobile 31apps. We wanted to make sure that there would always be an open platform 32available for carriers, OEMs, and developers to use to make their innovative 33ideas a reality. We wanted to make sure that there was no central point of 34failure, where one industry player could restrict or control the innovations 35of any other. The solution we chose was an open and open-source platform. 36 37The goal of the Android Open Source Project is to create a successful 38real-world product that improves the mobile experience for end users. 39 40## Governance Philosophy ## 41 42The companies that have invested in Android have done so on its merits, 43because we believe that an open platform is necessary. Android is 44intentionally and explicitly an open-source -- as opposed to free software -- 45effort: a group of organizations with shared needs has pooled 46resources to collaborate on a single implementation of a shared product. 47The Android philosophy is pragmatic, first and foremost. The objective is 48a shared product that each contributor can tailor and customize. 49 50Uncontrolled customization can, of course, lead to incompatible 51implementations. To prevent this, the AOSP also maintains the Android 52Compatibility Program, which spells out what it means to be "Android 53compatible", and what is required of device builders to achieve that status. 54Anyone can (and will!) use the Android source code for any purpose, and we 55welcome all such uses. However, in order to take part in the shared 56ecosystem of applications that we are building around Android, device builders 57must participate in the Compatibility Program. 58 59Though Android consists of multiple sub-projects, this is strictly a 60project-management technique. We view and manage Android as a single, 61holistic software product, not a "distribution", specification, or collection 62of replaceable parts. Our intent is that device builders port 63Android to a device; they don't implement a specification or curate a 64distribution. 65 66## How We Work ## 67 68We know that quality does not come without hard work. Along with many 69partners, Google has contributed full-time engineers, product managers, UI 70designers, Quality Assurance, and all the other roles required to bring 71modern devices to market. We roll the open source administration and 72maintenance into the larger product development cycle. 73 74- At any given moment, there is a current latest release of the Android 75platform. This typically takes the form of a branch in the tree. 76 77- Device builders and Contributors work with the current 78latest release, fixing bugs, launching new devices, experimenting with new 79features, and so on. 80 81- In parallel, Google works internally on the next version of the 82Android platform and framework, working according to the product's needs and 83goals. We develop the next version of Android by working with a device partner 84on a flagship device whose specifications are chosen to push Android 85in the direction we believe it should go. 86 87- When the "n+1"th version is ready, it will be published to the public 88source tree, and become the new latest release. 89 90