IllegalStateException，因为okhttp异步HTTP POST请求中的onResponse代码

Question

我在这里写了一段代码：

public class Wizard1 extends GuidedStepFragment implements Callback {

    private boolean sendPhoneNumber(String userPhoneNumber) {

        OkHttpClient client = new OkHttpClient();

        RequestBody requestBody = new MultipartBody.Builder()
                .setType(MultipartBody.FORM)
                .addFormDataPart("request_magic_code", Urls.REQUEST_MAGIC_CODE)
                .build();

        Request request = new Request.Builder()
                .url(Urls.HOST + Urls.SEND_PHONE_NUMBER)
                .post(requestBody)
                .build();

        client.newCall(request).enqueue(this);
        return success;
    }

    @Override
    public void onFailure(@NonNull Call call, @NonNull IOException e) {
        e.printStackTrace();
    }

    @Override
    public void onResponse(@NonNull Call call, @NonNull Response response) throws IOException {
        ResponseBody myResponse = response.body();
        Log.d("SS", response.body().string());

    Log.d("SS", response.body().string());

        if (myResponse != null) {
            success = true;
            }

}

当我运行它时，令人惊讶的是，我得到了java.lang.IllegalStateException。更令人惊讶的是，如果我删除第二个log.d行，异常将不会发生！

发生什么事了？为什么在onResponse中添加虚拟行会导致此错误？

以下是完整的错误日志：

10-24 05:16:38.307 663 9-6659/com.example.android.persistence W/system.err:java.lang.ILLegalStateException：关闭于Okio.realBufferedSource.rangeEquals(realBufferedSource.java:398)，关闭于Okio.realBufferedSource.rangeEquals(realBufferedSource.java:392)，关闭于Okhttp3.internal.util.bomaWareCharset(util.java:431)，关闭于r:
在Android.support.v17.leanback.supportleanbackshowcase.app.wizard.wizardGetPhoneNumber.onRespon(wizardGetPhoneNumber.java:244)在OKHTTP3.realcall$asynccall.execute(realcall.java:141)在OKHTTP3.internal.namedrunnable.run(namedrunnable.java:32)在爪哇：761）

Answer 1

您使用response.body().string()两次

来自OKHTTP3文档：响应主体只能使用一次。

@Override
public void onResponse(@NonNull Call call, @NonNull Response response) throws IOException {
    ResponseBody body = response.body();
    if(body != null) {
        try {
            //Use it anytime you want
            String responseString = body.string();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

@Override
public void onResponse(@NonNull Call call, @NonNull Response response) throws IOException {
    ResponseBody body = response.body();
    //Warning: this method loads the requested bytes into memory. Most
    // applications should set a modest limit on {@code byteCount}, such as 1 MiB.
    int bufferSize = 1024 * 1024;
    ResponseBody copy = response.peekBody(bufferSize);
}

但是要注意正确使用buffersize，以防止OutOfMemoryError

附言。您不需要将string记录到LogCat。有几种更有效的方法来调试OkHttp客户机，例如

• https://github.com/itkacher/okHttpProfiler-用于Android studio的插件，用于分析OkHttp请求
• https://www.charlesproxy.com/-http代理应用程序（安装手册）
• http://facebook.github.io/stetho/-Android应用程序的调试桥