相关疑难解决方法(0)

我正在尝试同时运行两个AsyncTasks.(平台是Android 1.5,HTC Hero.)但是,只有第一个被执行.这是一个描述我的问题的简单片段:

public class AndroidJunk extends Activity {
 class PrinterTask extends AsyncTask<String, Void, Void> {
     protected Void doInBackground(String ... x) {
      while (true) {
       System.out.println(x[0]);
       try {
        Thread.sleep(1000);
       } catch (InterruptedException ie) {
        ie.printStackTrace();
       }
      }
        }
    };

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        new PrinterTask().execute("bar bar bar");
        new PrinterTask().execute("foo foo foo");

        System.out.println("onCreate() is done.");
    }
}

我期望的输出是:

onCreate() is done.
bar bar bar
foo foo foo
bar bar bar
foo foo foo

等等.但是,我得到的是:

onCreate() is done. …