android - 检查工作 AsyncTask

Question

我在另一个线程中有一些工作要做(通过 doingAsyncTask)。 当用户点击按钮时工作开始。但同时 只有一个 doingAsyncTask 对象必须完成这项工作，我认为如果 doingAsyncTask 正在工作，则单击按钮不能创建一个新的 doingAsyncTask 对象并执行它，它必须等到工作完成。我该如何检查？

public class SearchActivity extends Activity {
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //....
    }

    public void onclickButton(View view) {
        new doingAsyncTask().execute();
    }

    public class doingAsyncTask extends AsyncTask<Void, Void, Void> {
    protected Void doInBackground(Void... unused) {
        //doing something
        return(null);
    }

    protected void onProgressUpdate() {
    }
    protected void onPreExecute() {
    }
    protected void onPostExecute() {
    }
   }
}

已解决 谢谢大家，它对我有用

      if(task.getStatus() == AsyncTask.Status.FINISHED)
            task=new ProgressBarShow();
        if(task.getStatus() == AsyncTask.Status.PENDING){
            //task=new ProgressBarShow();
            task.execute();
        }

Answer 1

检查这个AsyncTask.Status

AsyncTask.Status    FINISHED    Indicates that onPostExecute(Result) has finished. 
AsyncTask.Status    PENDING     Indicates that the task has not been executed yet. 
AsyncTask.Status    RUNNING     Indicates that the task is running. 

代码:

if (doingAsyncTask().getStatus().equals(AsyncTask.Status.FINISHED))
     doingAsyncTask().execute();
else

编辑:

public class SearchActivity extends Activity {
    doingAsyncTask asyncTask; 

    public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);             
       // ...
       asyncTask = new doingAsyncTask();   
    }
    public void onclickButton(View view) {
         if(ayncTask.getStatus().equals(AsyncTask.Status.FINISHED) || ayncTask.getStatus().equals(AsyncTask.Status.PENDING)) {
             asyncTask.execute();
         }
         else {
             // do something
         }
    }
    // ...
}