Research on the technical principles and implementation of the asynchronous layout of the asynchronous layout in the Android support library

Async Layout Inflaater in the Android support library is a technology used for asynchronous loading and filling layout.It can perform layout filling operations in the background thread to avoid the UI stutter phenomenon on the main thread.This article will study the technical principles and implementation of Async Layout Inflater, and provide relevant Java code examples. ## Technical principle Async Layout Inflator is performed by placing the layout and filling operation in a separate thread to optimize the UI rendering performance.In the traditional layout filling method, the layout analysis and filling operations are performed in the main thread. If the layout is relatively complex or the amount of data is large, it may cause the main thread to block and make the UI response slower. Async Layout Inflator uses an asynchronous way to load and fill the layout.It puts the layout analysis and filling operation in a background thread for execution, and passes the results to the main thread to display after completion.In this way, the main thread can keep a smooth response and avoid causing UI stuck. Specifically, the workflow of Async Layout Inflater is as follows: 1. Create an Asynclayoutinflator object. 2. Call the inflate () method of Asynclayoutinflator to specify the layout resource ID and the ViewGroup to be filled. 3. Asynclayoutinflator will start a background thread asynchronous and analyze and fill in the layout in this thread. 4. When the operation is completed, Asynclayoutinflator will pass the result to the main thread and notify the caller by the callback interface. 5. In the callback interface, you can get the layout after the filling, which can be added to the specified ViewGroup for display. ## Technical realization Below is a simple sample code using Async Layout Inflator: // Create Asynclayoutinflator object AsyncLayoutInflater inflater = new AsyncLayoutInflater(context); // Specify the layout resource ID and the ViewGroup to be filled, and set the callback interface inflater.inflate(R.layout.my_layout, parentView, new AsyncLayoutInflater.OnInflateFinishedListener() { @Override public void onInflateFinished(View view, int resid, ViewGroup parent) { // The callback after filling the operation is complete if (view != null) { // Add the filling layout to the specified ViewGroup for display } } }); In the above example, we first created an Asynclayoutinflator object.Next, we call asynclayoutinflator's INFLATE () method, specify the layout resource ID to be filled (using R.Layout.my_layout) and the ViewGroup to be filled.At the same time, we also set up a callback interface through the third parameter to receive notifications after filling the operation. In the callback interface, we can obtain the filling layout after the parameter View View, and can be added to the specified ViewGroup for display. ## Summarize Async Layout Inflator is a technology provided in the Android support library to optimize the performance of UI rendering.Through asynchronous execution layout analysis and filling operations, it can avoid the UI stuck phenomenon on the main thread.By using Async Layout Inflater, we can improve the user experience, keep the UI smooth and respond quickly.