The cache mechanism in the Volley framework is detailed

Detailed cache mechanism in Volley framework and example of Java code introduction: Volley is a powerful network request framework on the Android platform. It provides a simple and easy -to -use but functional API, which speeds up the development speed of network requests.The cache mechanism in the Volley framework is one of its important features, which can help us effectively manage the cache data required by the network.This article will introduce the cache mechanism in the Volley framework in detail, and provide some Java code examples to help readers understand and use. 1. Overview of the cache mechanism in the Volley framework: The cache mechanism in the Volley framework aims to avoid repeated network requests and improve the response speed of the application.It achieves this goal by storing requests and response data in the local cache.When the application initiates a network request, Volley first checks whether the local cache has the corresponding cache data.If there is a data that matches the current request in the cache, Volley uses the cache data without a network request, and returns the cache data to the application.Otherwise, Volley will continue to launch a network request. 2. The cache type in the Volley framework: The cache technical in the Volley framework supports two different types: memory cache and disk cache. -D memory cache: The memory cache is the default cache type in Volley.It stores requests and response data in the application of the application for fast access.Memory cache has fast reading and writing speed, but the storage capacity is limited.When the application cannot find the corresponding cache data in the memory cache, it will continue to find the disk cache. -D disk cache: Disk cache is a choice -cache type in Volley.It will be used in the storage medium (such as SD card) of requests and response data to the device for the application of the application after the application is restarted.The disk cache has a slow read and write speed, but the storage capacity is relatively large. 3. Use the cache mechanism in the Volley framework: To use the cache mechanism in the Volley framework, we need to perform the following steps: 3.1 Create a RequestQueue object: First, we need to create a RequestQueue object that is used to manage network requests and process the cache mechanism.You can create a RequestQueue object in the following way: RequestQueue requestQueue = Volley.newRequestQueue(context); 3.2 Create a cache directory: If we decide to use a disk cache, we need to create a cache directory to store requests and response data.You can create a cache directory in the following way: File cacheDir = new File(context.getCacheDir(), "volley_cache"); Cache cache = new DiskBasedCache(cacheDir); 3.3 Create a cache object: Next, we need to create a cache object and associate it with RequestQueue.You can create a cache object in the following way: Cache cache = new DiskBasedCache(cacheDir); requestQueue = new RequestQueue(cache, network); 3.4 Start with RequestQueue: Finally, we need to start the RequestQueue to start processing the network request and execute the cache mechanism.You can start the RequestQueue in the following way: requestQueue.start(); 4. Custom cache strategy: In addition to using Volley's default cache strategy, we can also customize the cache strategy.For example, we can customize parameters such as cache expiration time and cache size.The following is an example code for custom cache strategies: Cache cache = new diskbasedcache (cachedir, 10 * 1024 * 1024); // Set the cache size of 10MB Cache.entry Entry = cache.get (url); // Get the cache data if (entry != null && !entry.isExpired()) { // The cache data is not expired, use the cache data } else { // The cache data has expired or does not exist, conducting network requests } in conclusion: The cache mechanism in the Volley framework is a powerful and flexible feature that can help us effectively manage the cache data of the network request.By using the cache mechanism of the Volley framework, we can improve the response speed of the application and reduce dependence on network resources.I hope this article will help you understand and use the cache mechanism in the Volley framework. Note: The above code is only the example code. In actual use, appropriate modification and adjustment may be required.