类型Enum不是通用的;参数不能参数化它

The type Enum is not generic; it cannot be parameterized with arguments <RestClient.RequestMethod>

I've this error in the following code ..

我在下面的代码中有这个错误。

package ayanoo.utility;

    import java.io.BufferedReader;
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.InputStreamReader;
    import java.net.HttpURLConnection;
    import java.net.URL;
    import java.util.Vector;

    import org.apache.http.HttpEntity;
    import org.apache.http.HttpResponse;
    import org.apache.http.NameValuePair;
    import org.apache.http.client.ClientProtocolException;
    import org.apache.http.client.HttpClient;
    import org.apache.http.client.entity.UrlEncodedFormEntity;
    import org.apache.http.client.methods.HttpPost;
    import org.apache.http.client.methods.HttpUriRequest;
    import org.apache.http.impl.client.DefaultHttpClient;
    import org.apache.http.message.BasicNameValuePair;
    import org.apache.http.protocol.HTTP;

    import android.util.Log;

    public class  RestClient {

     public enum RequestMethod
     {
     GET,
     POST
     }

        private Vector <NameValuePair> params;

        private String url;

        private int responseCode;
        private String message;

        private String response;

        public String getResponse() {
            return response;
        }

        public String getErrorMessage() {
            return message;
        }

        public int getResponseCode() {
            return responseCode;
        }

        public RestClient(String url)
        {
            this.url = url;
            params = new Vector<NameValuePair>();
        }

        public void AddParam(String name, String value)
        {
            params.add(new BasicNameValuePair(name, value));
        }

        public void Execute(RequestMethod method) throws IOException
        {
            switch(method) {
                case GET:
                {
                    //add parameters
                    String combinedParams = "";
                    if(!params.isEmpty()){
                        combinedParams += "/";
                        for(NameValuePair p : params)
                        {
                            //String paramString = p.getName() + "=" + p.getValue();
                         String paramString = p.getValue();
                            if(combinedParams.length() > 1)
                            {
                                combinedParams  +=  "&" + paramString;
                            }
                            else
                            {
                                combinedParams += paramString;
                            }
                        }
                    }

                    Log.d("URL See:",url + combinedParams);
                    URL urlObject = new URL(url + combinedParams);
                    //URL urlObject = new URL("http://www.aydeena.com/Services/Search.svc/JSON/SearchByText/1");

                    executeRequest(urlObject);
                    break;
                }
                case POST:
                {
                    HttpPost request = new HttpPost(url);

                    //add headers

                    if(!params.isEmpty()){
                        request.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));
                    }

                    executeRequest(request, url);
                    break;
                }
            }
        }

        private void executeRequest(URL urlObject) throws IOException{
         HttpURLConnection con = null;
         con = (HttpURLConnection) urlObject.openConnection();
            con.setReadTimeout(10000 /* milliseconds */);
            con.setConnectTimeout(15000 /* milliseconds */);
            con.setRequestMethod("GET");
            //con.addRequestProperty("Referer",
              //    "http://www.pragprog.com/titles/eband/hello-android");
            con.setDoInput(true);

            // Start the query
            con.connect();
            response = convertStreamToString(con.getInputStream());
            Log.d("Response:", response);
        }

        private void executeRequest(HttpUriRequest request, String url)
        {
            HttpClient client = new DefaultHttpClient();
            Log.d("Test URL:", url);

            HttpResponse httpResponse;

            try {
                httpResponse = client.execute(request);
                responseCode = httpResponse.getStatusLine().getStatusCode();
                message = httpResponse.getStatusLine().getReasonPhrase();

                HttpEntity entity = httpResponse.getEntity();

                if (entity != null) {

                    InputStream instream = entity.getContent();
                    response = convertStreamToString(instream);

                    // Closing the input stream will trigger connection release
                    instream.close();
                }

            } catch (ClientProtocolException e)  {
                client.getConnectionManager().shutdown();
                e.printStackTrace();
            } catch (IOException e) {
                client.getConnectionManager().shutdown();
                e.printStackTrace();
            }
        }

        private static String convertStreamToString(InputStream is) {

            BufferedReader reader = new BufferedReader(new InputStreamReader(is));
            StringBuilder sb = new StringBuilder();

            String line = null;
            try {
                while ((line = reader.readLine()) != null) {
                    sb.append(line + "\n");
                }
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                try {
                    is.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return sb.toString();
        }
    }

what's the problem ??? !

有什么问题? ? ?!

5 个解决方案

#1

Are you sure the Java compiler is set to 1.5 (default for android) or better? If you are using Eclipse you can see that from the preferences.

你确定Java编译器设置为1.5 (android默认)还是更好?如果您正在使用Eclipse，您可以从首选项中看到这一点。

#2

I had the same problem, and it turned out that it was because the standard lib was not in the eclipse class path for the project. Just go into Build Path -> Add Libraries and add the JRE System Library

我遇到了同样的问题，结果是由于标准库没有在eclipse类路径中进行项目。只需进入构建路径—添加库并添加JRE系统库

#3

I had the same problem.

我也有同样的问题。

I only had one error in my project which was the "is not generic one'.

我的项目中只有一个错误，那就是“不是通用的”。

After I commented out the Enum code I found a lot more errors.

在我注释了Enum代码之后，我发现了很多错误。

There seemed to be some kind of hold-up. Only after fixing the other errors and then removing the comments did it work.

好像有什么耽搁了。只有在修复其他错误并删除注释之后，它才会工作。

#4

My project named A was just working fine until today but also the closing the project A and running other project B in the emulator im gonna call C, after running properly just closing B in the package explorer and reopening the dammaged one (A) fixed it, as a lil' background I have to say that the previous day while I was coding both projects I was messing with the <uses-sdk android:minSdkVersion=".. tag in the manifest of the project B the one I used today to help me with the dammaged one A, but yesterday when I compiled B and run a new emulator called D just created to run an older system version, as soon as D started, it was shutted down n' powered off(but the thing with D is due to the mess I have for laptop x)), all of this cuz' I was trying to make a non supported by an older API method to work xD.. so probably versioning triggered this issue in my case

我的项目命名只是工作正常,直到今天还关闭项目A和B在模拟器运行其他项目我要叫C,B在package explorer运行正常后就关闭,重启dammaged(A)固定它,作为一个背景lil '我不得不说,前一天我编码两个项目是干扰< uses-sdk android:minSdkVersion = " . .标记的清单项目B今天我使用dammaged一个来帮我,但是昨天当我B编译并运行一个名为D刚刚创建的新模拟器运行旧的系统版本,一旦D开始,关闭了n的断电(但是D是由于混乱我对笔记本电脑x)),所有这一切都因为“我想做一个不支持的一个年长的API方法xD工作. .所以在我的例子中，版本控制可能引发了这个问题

#5

Yes I also saw this error message for a project that was previously working fine.

是的，我还看到了这个错误消息，是关于一个以前运行良好的项目。

I checked the compiler version (I am using 1.6) as well as the system library (it is already being used) to no avail.

我检查了编译器版本(我正在使用1.6版本)和系统库(已经在使用)，但没有任何用处。

Finally I just closed the project and then re-opened it, and then the problem went away. Sounds like an Eclipse bug to me.

最后我结束了这个项目，然后重新打开它，然后问题就解决了。对我来说，这听起来像是一个Eclipse bug。