價值變動

Question

變化的TextView文本我想點擊一個按鈕後，做這樣的事情：

case R.id.bcheckConnection: 
     if (IPok()) { 
      PlcState.ErrPlc = false; 
      Constant.adressIpPlc = adresIp.getText().toString(); 

      final ProgressDialog dialog =  ProgressDialog.show(Main.this, "", "Trying to connect..."); 
      new Thread(new Runnable() { 
       public void run() { 
        timeout = network.testConnection(Constant.adressIpPlc, 102, 20000); 
        dialog.dismiss(); 
       } 
      }).start(); 

      if (timeout > -1) { 
       PlcState.ErrPlc = false; 

       stanPolaczenia.setText("Connection established. Timeout = "); 
       stanTimeout.setText(Long.toString(timeout)); 
       currentIp.setText(Constant.adressIpPlc); 

      } else { 
       PlcState.ErrPlc = true; 
       stanPolaczenia.setText("Error"); 
       stanTimeout.setText(""); 
       currentIp.setText(Constant.adressIpPlc); 
      } 
     } else { 
      Toast.makeText(Main.this, "Wrong IP", Toast.LENGTH_LONG).show(); 
     } 
     break; 

所以是有可能AFTER線程停止運行更改文本？

Answer 1

您可以使用Thread.join()阻止當前線程，直到指定的線程完成：

Thread myThread = new Thread(new Runnable() { 
    public void run() { 
     // Do something 
    } 
}); 
myThread.start(); 

// Do some things 

// and block current thread until myThread is finished 
myThread.join(); 

// Continue execution after myThread got finished 

編輯：作爲@Eric已經提到了這個問題的意見：你的（例如）的情況似乎更有意義使用AsyncTask。它有兩個事件（在UI線程中調用），所以您可以使用進度更新和任務完成時更新UI。對於AsyncTask示例，請參閱：AsyncTask Android example