問題描述

我有一個登錄屏幕，其中包含 2 個用于用戶名和密碼的 EditText.我的要求是，在方向更改時，EditText 中的輸入數據(如果有)應保持原樣，并且還應繪制新布局.我有 2 個布局 xml 文件 - 一個位于布局文件夾中，另一個位于在布局土地文件夾中.我正在嘗試實現以下兩種方法，但它們都不是完美的:

I have a Login screen which consists of 2 EditTexts for Username and Password. My requirement is that on orientation change , input data(if any) in EditText should remain as it is and a new layout should also be drawn. I have 2 layout xml files- one in layout folder and other in layout-land folder. I am trying to implement following 2 approaches but none of them is perfect:

(1) configChanges:keyboardHidden - 在這種方法中，我不在清單文件的 configChanges 中提供方向".所以我在 onCreate() 和 onConfigurationChanged() 方法中都調用了 setContentView() 方法.它滿足我的兩個要求.布局已更改，EditTexts 中的輸入數據也保持原樣.但它有一個大問題:

(1) configChanges:keyboardHidden - In this approach, I don't provide "orientation" in configChanges in manifest file. So I call setContentView() method in both onCreate() and onConfigurationChanged() methods. It fulfills both my requirements. Layout is changed and input data in EditTexts also remains as it is. But it has a big problem :

當用戶點擊登錄按鈕時，ProgressDialog 會顯示，直到收到服務器響應.現在，如果用戶在 ProgressDialog 運行時旋轉設備，應用程序會崩潰.它顯示一個異常說視圖不能附加到窗口".我嘗試使用 onSaveInstanceState 處理它(在方向更改時會調用它)，但應用程序仍然崩潰.

When user clicks on Login button, a ProgressDialog shows until server-response is received. Now if user rotates the device while ProgressDialog is running, app crashes. It shows an Exception saying "View cannot be attached to Window." I have tried to handle it using onSaveInstanceState (which DOES get called on orientation change) but app still crashes.

(2) configChanges:orientation|keyboardHidden - 在這種方法中，我在清單中提供了方向".所以現在我有兩種情況:

(2) configChanges:orientation|keyboardHidden - In this approach, I provide "orientation" in manifest. So now I have 2 scenarios:

(a) 如果我在 onCreate() 和 onConfigurationChanged() 中調用 setContentView() 方法，布局會相應更改，但 EditText 數據會丟失.

(a) If I call setContentView() method in both onCreate() and onConfigurationChanged(), Layout is changed accordingly but EditText data is lost.

(b) 如果我在 onCreate() 中調用 setContentView() 方法，但在 onConfigurationChanged() 中沒有調用，則 EditText 數據不會丟失，但布局也不會相應更改.

(b) If I call setContentView() method in onCreate() , but not in onConfigurationChanged(), then EditText data is not lost but layout also not changes accordingly.

在這種方法中，甚至不會調用 onSaveInstanceState().

And in this approach, onSaveInstanceState() is not even called.

所以我處于一個非常可怕的境地.這個問題有什么解決辦法嗎?請幫忙.提前謝謝.

So I am in a really intimidating situation. Is there any solution to this problem? Please help. Thanx in advance.

推薦答案

在onConfigurationChanged方法中，先在全局變量中獲取兩個編輯文本的數據，然后調用setContentView方法.現在將保存的數據再次設置到編輯文本中.

in onConfigurationChanged method, first get the data of both the edit texts in global variables and then call setContentView method. Now set the saved data again into the edit texts.

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