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View Yen as the value of the entire app of play, it occupies an important position in the Android system. Android View in-depth understanding of the drawing process, proper use View to build a pleasing appearance, and with cool effects and other aspects of the Custom View to design the ideal, has an extremely important role in helping, so the process will be drawn as a custom View the first article View series. Of course, the drawing process principle of View, in the real work is to be an obstacle to be overcome on the road engineer; in the interview, the interview is the high point of the post, almost interviewer will ask questions. Overall, the principle of Android View of the drawing process, is one of the basic internal strength of an Android programmer.
The greatest feature of this paper is to maximize the answer to the source. Source recover from the ins and outs of the process, the search function in the comments bit by bit, try to find all the conclusions are based on the key processes in the source code and detailed comments try to say, non-key place to try simple. So the reader will see, this paper posted a lot of source code, and are basically drawn process and analyze relevant code, together with a large number of source notes, and translation and collation of these comments. At the end of each course, but also according to the flow direction of the source code, it drew a simple flow chart of the key, in order to help the reader understand and deepen the impression. In fact, the author of this article is to record from almost nothing to carry out his track the source to find out the full experience of the whole painting process, we encountered some confusion and half-way point will be difficult to spend a lot of space to explain. Of course, this article is not enough merely to learn, because a lot of content in this area, is the only article can not cover everything in. Like other well-known blog, like the text, has its own focus, and some focus on analyzing the process according to the example, and some will be attached demo to validate key findings, this paper will be given the appropriate link some of the better blog, the reader you can go to these places make up for lack of paper. Finally, long-winded one, the focus of this article is from the source of the "six steps", takes the reader "Reach", hoping to give readers a little help. Further, described herein that are based on source herein, i.e. the API26 Android8.0 system version.