如何在方向更改时保留 EditText 数据? [英] How to retain EditText data on orientation change?

问题描述

我有一个登录屏幕，其中包含 2 个用于用户名和密码的 EditText.我的要求是，在方向更改时，EditText 中的输入数据(如果有)应保持原样，并且还应绘制新布局.我有 2 个布局 xml 文件 - 一个位于布局文件夹中，另一个位于在布局土地文件夹中.我正在尝试实现以下两种方法，但它们都不是完美的:

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 - 在这种方法中，我不在清单文件的 configChanges 中提供方向".所以我在 onCreate() 和 onConfigurationChanged() 方法中都调用了 setContentView() 方法.它满足我的两个要求.布局已更改，EditTexts 中的输入数据也保持原样.但它有一个大问题:

(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 :

当用户点击登录按钮时，ProgressDialog 会显示，直到收到服务器响应.现在，如果用户在 ProgressDialog 运行时旋转设备，应用程序会崩溃.它显示一个异常说视图不能附加到窗口".我尝试使用 onSaveInstanceState 处理它(在方向更改时会调用它)，但应用程序仍然崩溃.

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 - 在这种方法中，我在清单中提供了方向".所以现在我有两种情况:

(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() 中调用 setContentView() 方法，布局会相应更改，但 EditText 数据会丢失.

(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() 中调用 setContentView() 方法，但在 onConfigurationChanged() 中没有调用，则 EditText 数据不会丢失，但布局也不会相应更改.

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

在这种方法中，甚至不会调用 onSaveInstanceState().

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

所以我处于一个非常可怕的境地.这个问题有什么解决办法吗?请帮忙.提前谢谢.

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

推荐答案

在onConfigurationChanged方法中，先在全局变量中获取两个编辑文本的数据，然后调用setContentView方法.现在将保存的数据再次设置到编辑文本中.

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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