Solutions to using Okhttp servers do not support caching

Use OkHttp to create a cache interceptor to ensure that cached data is preferred regardless of network status.

1. Create an interceptor

First, we need to create an interceptor for cache logic for handling requests and responses:

import ;
import ;
import ;
import ;
public class CacheInterceptor implements Interceptor {
    @Override
    public Response intercept(Chain chain) throws IOException {
        Request request = ();
        // Try to get data from the cache first        Response response = (request);
        // Set cache control header        int maxAge = 60; // The cache is valid for 60 seconds        return ()
                .removeHeader("Pragma") // Clear header information                .removeHeader("Cache-Control")
                .header("Cache-Control", "public, max-age=" + maxAge)
                .build();
    }
}

2. Set up OkHttpClient

Next, we need to add this interceptor to the OkHttpClient and set the cache:

import ;
import ;
import ;
import ;
public class HttpClient {
    private static final long DEFAULT_CACHE_SIZE = 10 * 1024 * 1024; // 10 MB
    public static OkHttpClient createClient() {
        // Set cache directory        File cacheFile = new File(().getCacheDir(), "cacheData");
        Cache cache = new Cache(cacheFile, DEFAULT_CACHE_SIZE);
        // Create OkHttpClient        return new ()
                .retryOnConnectionFailure(true) // Whether to reconnect after connection failure                .connectTimeout(15, ) // Timeout time 15 seconds                .addNetworkInterceptor(new CacheInterceptor()) // Add a network interceptor                .cache(cache) // Set cache                .build();
    }
}

3. Use OkHttpClient

Finally, you can use this in your applicationHttpClientClass to create an OkHttpClient instance and make network requests:

import ;
import ;
import ;
import ;
import ;
public class NetworkRequest {
    public void fetchData(String url) {
        OkHttpClient client = ();
        Request request = new ()
                .url(url)
                .build();
        (request).enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                // Processing request failed                ();
            }
            @Override
            public void onResponse(Call call, Response response) throws IOException {
                if (()) {
                    // Process successful response                    String responseData = ().string();
                    // Processing data...                } else {
                    // Handle error response                }
            }
        });
    }
}

Summarize

Through the above steps, you can ensure that cached data is preferred in network requests, regardless of network status. This approach can improve the response speed of the application and provide a better user experience when the network is unstable.

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