我有一個共同的階級說的如A級延伸AsyncTask，并已實施即所有的方法onPreExecute，doinbackground和onPostExecute。現(xiàn)在，還有其他一些要使用Class A對象的類。假設(shè)B類以以下方式使用A類A a = new A(context)a.execute(url)然后我在get方法中獲取結(jié)果。但是get方法不是使用AsyncTask的正確方法。我想在中得到結(jié)果onPostExecute。為此，我嘗試使用布爾參數(shù)，該參數(shù)僅在中有效onpostexecute。B類將檢查直到它變?yōu)檎?，并且在它變?yōu)檎鏁r將獲取結(jié)果。但這以某種方式阻止了應(yīng)用程序。我在下面放置了asynctask的代碼。'import java.io.IOException;import org.apache.http.client.ClientProtocolException;import org.apache.http.client.HttpClient;import org.apache.http.client.ResponseHandler;import org.apache.http.client.methods.HttpGet;import org.apache.http.impl.client.BasicResponseHandler;import org.apache.http.impl.client.DefaultHttpClient;import android.app.ProgressDialog;import android.content.Context;import android.os.AsyncTask;public class A extends AsyncTask<String, Void, String> {private Context context = null;private final HttpClient httpClient = new DefaultHttpClient();private String content = null;//private String error = null;private String finalResult = null;private static boolean isResult = false;private ProgressDialog progressDialog = null; public BabbleVilleSyncTask(Context context){    this.context = context;     progressDialog = new ProgressDialog(this.context);}protected void onPreExecute() {    progressDialog.setMessage("Please Wait....");    progressDialog.show();}protected String doInBackground(String... urls) {    try     {        //urls[0] = URLEncoder.encode(urls[0], "UTF-8");        HttpGet httpget = new HttpGet(urls[0]);        ResponseHandler<String> responseHandler = new BasicResponseHandler();        content = httpClient.execute(httpget, responseHandler);    }    /*catch(UnsupportedEncodingException ue)    {        error = ue.getMessage();    }*/    catch (ClientProtocolException e)     {        //error = e.getMessage();        cancel(true);    }    catch (IOException e)     {        //error = e.getMessage();        cancel(true);    }    httpClient.getConnectionManager().shutdown();    return content;}有人可以讓我知道可能是什么問題嗎？