Question

我在Android的EndpointAsyncTask中使用了这种方法：

class EndpointsAsyncTask extends AsyncTask<Void, Void, List<User>> {
private static UserEndpoint myApiService = null;
private Context context;

EndpointsAsyncTask(Context context) {
    this.context = context;
}

继续在这里：

@Override
protected List<User> doInBackground(Void... params) {
    if(myApiService == null) { // Only do this once
        UserEndpoint.Builder builder = new   UserEndpoint.Builder(AndroidHttp.newCompatibleTransport(),
                new AndroidJsonFactory(), null)
// options for running against local devappserver
// - 10.0.2.2 is localhost's IP address in Android emulator
// - turn off compression when running against local devappserver
                .setRootUrl("http://localhost:8080/_ah/api/")
                .setGoogleClientRequestInitializer(new GoogleClientRequestInitializer() {
                    @Override
                    public void initialize(AbstractGoogleClientRequest<?> abstractGoogleClientRequest) throws IOException {
                        abstractGoogleClientRequest.setDisableGZipContent(true);
                    }
                });
// end options for devappserver

        myApiService = builder.build();
    }

但是这只是在Android Studio 1.2.2只在运行时btw：

给我一个错误

9770-9892/com.kkoci.shairlook E/AndroidRuntime﹕ FATAL EXCEPTION: AsyncTask #1
java.lang.RuntimeException: An error occured while executing doInBackground()
        at android.os.AsyncTask$3.done(AsyncTask.java:299)
        at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
        at java.util.concurrent.FutureTask.setException(FutureTask.java:219)
        at java.util.concurrent.FutureTask.run(FutureTask.java:239)
        at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
        at java.lang.Thread.run(Thread.java:856)
 Caused by: java.lang.NoClassDefFoundError: com.kkoci.shairlook.EndpointsAsyncTask$1
        at com.kkoci.shairlook.EndpointsAsyncTask.doInBackground(EndpointsAsyncTask.java:33)
        at com.kkoci.shairlook.EndpointsAsyncTask.doInBackground(EndpointsAsyncTask.java:22)
        at android.os.AsyncTask$2.call(AsyncTask.java:287)
        at java.util.concurrent.FutureTask.run(FutureTask.java:234) 
        at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)

我已经在doInBackground无法使用任何UI方法的地方读过，可能是吗？

但实际上我无法在这里弄明白，我从一个活动中调用这个AsyncTask类，这样：

        public void getUSer(View v) {
        new EndpointsAsyncTask(this).execute();
    }

这是从按钮调用的，如下所示：

<Button
            android:id="@+id/twitter"
            android:layout_width="50dp"
            android:layout_height="50dp"
            android:text="Register with Twitter"
            android:textColor="#FFF"
            android:layout_marginBottom="10dp"
            android:textSize="20dp"
            android:layout_marginTop="11dp"
            android:layout_marginLeft="30dp"
            android:background="@drawable/twitter_button"
            android:onClick="getUser"/>

有什么想法吗？

提前感谢！

AndroidStudio上的java.lang.NoClassDefFoundError - AsyncTask

0 个答案: