android - 在静态函数中执行 AsyncTask 的问题

Question

我正在尝试从静态函数执行 doInBackground AsycTask，但是当我尝试输入 Void 的参数时，我收到一个 Java 错误，说“Void”不适用于任务“String、Void、Boolean”

无论如何，这是我的代码：

public class RequestHandler extends AsyncTask<URL, Void, Boolean> {

    //atributes for Async
    private static Context context;
    private RequestHandler origin;

 // Constructor
    public RequestHandler(Context c) {

        origin = this;
        context = c;

    }

   public static boolean doLogin(String username, String password) {
       String URL = "http://127.0.0.1:1337";
new RequestHandler(context).execute(URL, Void, false); // what do I put here?  
   }


    @Override
    protected Boolean doInBackground(URL... params) {
        // TODO Auto-generated method stub
        URL url = null;
        try {
           HttpURLConnection urlConnection = null;
        try {
            urlConnection = (HttpURLConnection) url.openConnection();
        } catch (IOException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }
           try {
             InputStream in = null;
            try {
                in = new BufferedInputStream(urlConnection.getInputStream());
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
             readStream(in);
           } finally {

           }
        return false;

           }
            private String readStream(InputStream is) {
                try {
                  ByteArrayOutputStream bo = new ByteArrayOutputStream();
                  int i = is.read();
                  while(i != -1) {
                    bo.write(i);
                    i = is.read();
                  }
                  return bo.toString();
                } catch (IOException e) {
                  return "";
                }
            }
}

Answer 1

1. 将 'doLogin 方法放在 AsyncTask 类之外
2. new RequestHandler(context).execute(URL);
3. protected Boolean doInBackground(String... params) {....}

Answer 2

在 doLogin 方法中调用 RequestHandler 的地方，您正在尝试使用 Void 作为对象，但它是一种类型，请尝试将该行更改为：

new RequestHandler(context).execute(URL, null, false);

并让您的 AsyncTask 改为返回 null 。