使用Android Volley时出现NoClassDefFoundError

问题描述

我正在尝试使用android volley库发出网络请求:

I am trying to make a network request using android volley library:

    StringRequest jsObjRequest = new StringRequest(Request.Method.GET,
                Network.getFullUrl("/Account/Login"),
                new Listener<String>() {

                    @Override
                    public void onResponse(String response) {
                        // TODO Auto-generated method stub

                    }
                }, new ErrorListener() {

                    @Override
                    public void onErrorResponse(VolleyError error) {
                        // TODO Auto-generated method stub

                    }
                });

Network.getInstance(this).addToRequestQueue(jsObjRequest);

我已将库包含在项目"下的构建路径中.而且编译良好，

I have included the library in the build path under Projects. And it compiles fine,

但是当我运行该应用程序时，出现以下错误:

But when I run the app I get the following error:

08-18 21:57:05.739: E/AndroidRuntime(22937): FATAL EXCEPTION: main
08-18 21:57:05.739: E/AndroidRuntime(22937): java.lang.NoClassDefFoundError:    com.android.volley.toolbox.StringRequest
08-18 21:57:05.739: E/AndroidRuntime(22937):    at com.fma.mobileapp.LoginActivity.attemptLogin(LoginActivity.java:173)
08-18 21:57:05.739: E/AndroidRuntime(22937):    at com.fma.mobileapp.LoginActivity$2.onClick(LoginActivity.java:94)
08-18 21:57:05.739: E/AndroidRuntime(22937):    at android.view.View.performClick(View.java:4475)
08-18 21:57:05.739: E/AndroidRuntime(22937):    at android.view.View$PerformClick.run(View.java:18786)
08-18 21:57:05.739: E/AndroidRuntime(22937):    at android.os.Handler.handleCallback(Handler.java:730)
08-18 21:57:05.739: E/AndroidRuntime(22937):    at android.os.Handler.dispatchMessage(Handler.java:92)
08-18 21:57:05.739: E/AndroidRuntime(22937):    at android.os.Looper.loop(Looper.java:137)
08-18 21:57:05.739: E/AndroidRuntime(22937):    at android.app.ActivityThread.main(ActivityThread.java:5419)
08-18 21:57:05.739: E/AndroidRuntime(22937):    at java.lang.reflect.Method.invokeNative(Native Method)
08-18 21:57:05.739: E/AndroidRuntime(22937):    at java.lang.reflect.Method.invoke(Method.java:525)
08-18 21:57:05.739: E/AndroidRuntime(22937):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1209)
08-18 21:57:05.739: E/AndroidRuntime(22937):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1025)
08-18 21:57:05.739: E/AndroidRuntime(22937):    at dalvik.system.NativeStart.main(Native Method)

[EDIT}

我正在使用最新版本的Android SDK

I am using latest version of Android SDK

推荐答案

要与 Volley 一起使用，我们需要在Android项目的应用程序模块中的gradle文件中定义依赖项:

To work with Volley we need to define the dependency into the gradle file in Android project's app module:

dependencies {
    ...
    compile 'com.android.volley:volley:1.1.0'
}

您可以在 此处 上查看Volley的最新版本.

you can see the latest versions of Volley here.

更多信息:

使用Volley传输网络数据

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