[移动开发]Android 添加请求头

import java.util.concurrent.TimeUnit;
import okhttp3.Interceptor;
import okhttp3.OkHttpClient;
import okhttp3.logging.HttpLoggingInterceptor;
import retrofit2.Retrofit;
import retrofit2.adapter.rxjava2.RxJava2CallAdapterFactory;
import retrofit2.converter.gson.GsonConverterFactory;

/**
 * @ClassName RetrofitUtil
 * @Description 网络请求封装
 */
public class RetrofitUtil {

    private static RetrofitUtil instance;
    private final Retrofit retrofit;

    //单例模式
    public static RetrofitUtil getInstance(){
        if (instance == null){
            synchronized (RetrofitUtil.class){
                if (instance == null){
                    instance = new RetrofitUtil();
                }
            }
        }
        return instance;
    }
    //网络请求
    private RetrofitUtil(){
        HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor();
        interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
        OkHttpClient okHttpClient = new OkHttpClient
                .Builder()
                .addInterceptor(interceptor)
                //.addInterceptor(new MoreBaseUrlInterceptor())
                .addInterceptor(new HandlerUtils())
                .addInterceptor(new TokenInterceptor())
                .connectTimeout(20000,TimeUnit.SECONDS)
                .readTimeout(20000,TimeUnit.MILLISECONDS)
                .writeTimeout(20000,TimeUnit.SECONDS)
                .retryOnConnectionFailure(true)
                .sslSocketFactory(TrustAllCerts.createSSLSocketFactory())
                .hostnameVerifier(new TrustAllCerts.TrustAllHostnameVerifier())
                .build();
        retrofit = new Retrofit.Builder()
                .addConverterFactory(GsonConverterFactory.create())
                .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
                .baseUrl(API.BASE)
                .client(okHttpClient)
                .build();
    }
    public <T> T create(final Class<T> service){
        return retrofit.create(service);
    }
}

HandlerUtils

import android.util.Log;
import androidx.annotation.NonNull;
import com.jzxny.jiuzihaoche.base.MyApplication;
import java.io.IOException;
import okhttp3.Interceptor;
import okhttp3.Request;
import okhttp3.Response;

public class HandlerUtils implements Interceptor {

    @NonNull
    @Override
    public Response intercept(Chain chain) throws IOException {
        String token = SpUtils.getString(MyApplication.context, "access_token");
        //SpUtils是SharedPreferences的工具类，自行实现
        if (token.isEmpty()) {
            Request originalRequest = chain.request();
            return chain.proceed(originalRequest);
        }else{
            Request originalRequest = chain.request();
            Request updateRequest = originalRequest.newBuilder().header("Authorization", "Bearer "+token).build();
            return chain.proceed(updateRequest);
        }
    }
}