In -depth analysis of the technical principles of Async Layout Inflator in the Android support library

In -depth analysis of the technical principles of Async Layout Inflator in the Android support library introduction: In Android development, layout of the filling inclator is a very important component, which is responsible for parsing the XML layout file into a view object.This analysis process is often synchronized, that is, in the main thread, which may lead to the problem of interface stuttering.To solve this problem, the Google Development Team launched an asynchronous layout of the Async Layout Inflator. 1. Introduction to the launch of the filling device asynchronous The asynchronous layout filling is a new feature in the Android support library. It can remove the analysis process of the layout file out of the main thread to improve the performance and response ability of the application.Its principle is achieved through multi -threaded, and the heavy layout analysis tasks are handed over to the child thread to complete, and the results of the analysis are received by callbacks in the main thread. 2. Steps to use the asynchronous layout filler The use of asynchronous layout fillers need to be carried out according to the following steps: Step 1: Create Asynclayoutinflator object Create an Asynclayoutinflator object in the code, which is used to perform the operation of asynchronous layout filling. AsyncLayoutInflater inflater = new AsyncLayoutInflater(context); Step 2: Create a callback interface Implement asynclayoutinflator.oninflatefinishedListener interface and rewrite the onInflateFinished method.This method will be called when the layout is complete, and the filled view object can be obtained in this method. AsyncLayoutInflater.OnInflateFinishedListener listener = new AsyncLayoutInflater.OnInflateFinishedListener() { @Override public void onInflateFinished(View view, int resid, ViewGroup parent) { // The processing logic after the layout is complete } }; Step 3: Call the asynchronous layout filling The asynchronous filling operation of the layout is performed by calling the INFLATE method of the filling of the filling. inflater.inflate(resId, parent, listener); 3. The working principle of the asynchronous layout filler The working principle of the asynchronous layout filler is mainly divided into the following processes: Step 1: Analyze the layout file The asynchronous layout filler will first analyze the specified XML layout file into a layout tree.This analysis process is time -consuming, so it is necessary to execute in the sub -thread to avoid blocking the main thread. Step 2: Create a view object After the analysis is completed, the asynchronous layout filling will create a corresponding view object based on the structure of the layout tree.In the process of creating a view object, the asynchronous layout filling device uses a thread pool to manage the execution of multiple sub -threads. Step 3: Receive interface notification results When the viewing object is created, the asynchronous layout filler will notify the results to the main thread by the callback interface onInflatefinishedLishes.Developers can get the filled view objects in the callback method and perform corresponding treatment. 4. The advantages and applicable scenarios of the asynchronous layout filling device The use of asynchronous layout fillers has the following advantages and applicable scenarios: 4.1 Improve performance and response ability Moving the layout operation out of the main thread can avoid time -consuming layout analysis in the main thread, thereby improving the performance and response ability of the application.Especially when the layout documents are complicated and the nested levels are deeper, the advantages of the asynchronous layout filling device are more obvious. 4.2 Accelerate interface loading speed Because the asynchronous layout filling process puts the layout filling process in the sub -thread to perform, it can speed up the loading speed of the interface and bring a better experience to users. 4.3 Applicable to the filling of repeated views such as lists and grids When using a list or grid view with RecyclerView, because frequent filling views are required, if an asynchronous layout filling can effectively reduce the workload of the main thread and improve the fluency of rolling. in conclusion: Async Layout Inflator is an important feature in the Android support library. It can improve the performance and response capabilities of the application by putting the layout and filling process in the sub -thread.Developers can optimize the layout of filling operations by using asynchronous layout fillers to enhance the user experience.