從對話框返回數據

Question

我使用對話框作爲用戶輸入數據的窗體。當他們點擊「確定」按鈕時，對話框關閉，我需要使用輸入的數據。一旦對話框關閉，我怎樣才能在活動中引用這些數據？

Answer 1

獲取它，當用戶按下「確定」按鈕

final EditText input = new EditText(this); // This could also come from an xml resource, in which case you would use findViewById() to access the input 

AlertDialog.Builder builder = new AlertDialog.Builder(this); 
builder.setView(input); 
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() { 
    public void onClick(DialogInterface dialog, int whichButton) { 
     String value = input.getText().toString(); 
     mItem.setValue(value); // mItem is a member variable in your Activity 
     dialog.dismiss(); 
    } 
}); 

Answer 2

指定一個OnDismissListener到對話框並將數據傳遞給那裏的活動。

或者，您可以創建對話框活動並將數據作爲活動結果返回。請參閱以下鏈接瞭解更多信息有關啓動活動和gettings結果：

http://developer.android.com/reference/android/app/Activity.html#StartingActivities