从 Service 启动的 Android Toast 只显示一次

Question

我有一个监控套接字连接的服务。当连接丢失时，它需要显示一个 Toast 通知用户它正在重新连接。这第一次工作正常。之后，我在日志中看到了 enqueueToast，但未显示 toast。任何想法表示赞赏。我认为这将是一件容易添加的事情，但我一定遗漏了一些东西。

日志条目

INFO/NotificationService(118): enqueueToast pkg=com.abc callback=android.app.ITransientNotification$Stub$Proxy@43f7b100 duration=1

调用Toast的代码

public class ConnectionService extends Service 
{ .....

public void restartConnection()
{
  try
  {
     Log.i(this.toString(), "Attempting to reconnect...");

     // increase the wait between each retry until the max is reached
     int sleepTime = reconnectCounter * MIN_RECON_WAIT;

     if (sleepTime > MAX_RECON_WAIT)
     {
        sleepTime = MAX_RECON_WAIT;
     }

     String msg = "The connection has been lost.  Restart attempt will start in: " + sleepTime/1000 + " seconds";

     Log.i(this.toString(), msg);
     Toast.makeText(getApplicationContext(), msg , Toast.LENGTH_LONG).show();

     Thread.sleep(sleepTime);

     // increment the counter
     reconnectCounter++;

     this.startConnectionThread();

  }
  catch (Exception e)
  {
      Log.e(this.toString(), "Exception: " + e.toString());
      e.printStackTrace();
  }
}// end retartConnection

Answer 1

是的，您可以使用 runOnUiThread，这是一种合法的方式。
另外，您可以尝试 Handler 替代方案。无论哪种方式，它都应该有效。

这是我头脑中的一些代码。我现在没有 SDK 来测试它，但我认为它应该给你一个大概的想法。

public class ConnectionService extends Service {  
  private Handler handler = new Handler();

  public void restartConnection(){
     int sleepTime = reconnectCounter * MIN_RECON_WAIT;
     if (sleepTime > MAX_RECON_WAIT)
     {
        sleepTime = MAX_RECON_WAIT;
     }
     String msg = "The connection has been lost.  Restart attempt will start in: " + sleepTime/1000 + " seconds";
     (new Timer()).schedule(
     new TimerTask() {
        public void run() {
           handler.post(new Runnable() {
              public void run() {
                 Toast.makeText(getApplicationContext(), "msg", Toast.LENGTH_LONG).show();
                 reconnectCounter++;
                 this.startConnectionThread()
              }
           });
        }
     }, sleepTime);
  }//end restartConnection

}//end ConnectionService