Volley

Volley is not suitable for large download or streaming operations, since Volley holds all responses in memory during parsing. For large download operations, consider using an alternative like DownloadManager.

Retrofit

打印日志

Retrofit 默认并没有将 request 和 response 的情况在 logcat 里打印出来，这不利于调试。打印日志需要使用到 OkHttp 的 LoggingInterceptor，关于 Interceptor 可以参见 OkHttp 的 Wiki。

示例代码：

app/build.gradle

...
dependencies {
    ...
    implementation 'com.squareup.okhttp3:logging-interceptor:3.9.1'
}

HttpLoggingInterceptor loggingInterceptor = new HttpLoggingInterceptor(new HttpLoggingInterceptor.Logger() {
    @Override
    public void log(String message) {
        LogUtils.d("retrofit", message);
    }
});
loggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY);

OkHttpClient client = new OkHttpClient.Builder()
        .addInterceptor(loggingInterceptor)
        .build();

Retrofit retrofit = new Retrofit.Builder()
        .client(client)
        .baseUrl(Constants.HTTP_BASE_URL)
        .addConverterFactory(ScalarsConverterFactory.create())
        .addConverterFactory(GsonConverterFactory.create())
        .build();

LogginInterceptor 有 NONE、BASIC、HEADERS 和 BODY 四种 Level，按需求设置。

遇到错误 Case 1

android.util.MalformedJsonException: Use JsonReader.setLenient(true) to accept malformed JSON at line 1 column 1 path $

一般是由于返回的 Json 串里有没用引号包围的字段名，比如 {name: "Jack"}。

方案有二：

1. 修改服务端返回内容，确保该现象不会再发生；

2. 修改客户端，让 GsonConverter 能够兼容处理这种情况，比如修改之前的代码是：

    Retrofit retrofit = new Retrofit.Builder()
        .client(client)
        .baseUrl(Constants.HTTP_BASE_URL)
        .addConverterFactory(ScalarsConverterFactory.create())
        .addConverterFactory(GsonConverterFactory.create())
        .build();
   

   修改之后：

    Retrofit retrofit = new Retrofit.Builder()
        .client(client)
        .baseUrl(Constants.HTTP_BASE_URL)
        .addConverterFactory(ScalarsConverterFactory.create())
        .addConverterFactory(GsonConverterFactory.create(new GsonBuilder().setLenient().create()))
        .build();
   

参考

• Transmitting Network Data Using Volley