blocks|key|582372|text|我用的最好的方法是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|582373|放置一个ProgressBar就在登录Button旁边。|offset|length|style|CODE|582374|我在OnCreate方法中放置了一个进度条(其可见性设置为OnCreate)。|582375|当用户单击Login/Submit按钮时，我将按钮的可见性设置为View.GONE，将ProgressBar的可见性设置为View.VISIBLE。|582376|它看起来很好，用户在完成工作之前不能单击按钮，如果发生错误，请切换可见性以让用户再次尝试。|582377|entityMap^0|0|4|B|J|6|0|2|8|T|8|0|W|9|17|B|1P|C|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@$D|R|E|S|F|G]|$D|T|E|U|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|V|8|@$D|W|E|X|F|G]|$D|Y|E|Z|F|G]]|9|@]|A|$]]|$1|J|3|K|5|6|7|10|8|@$D|11|E|12|F|G]|$D|13|E|14|F|G]|$D|15|E|16|F|G]]|9|@]|A|$]]|$1|L|3|M|5|6|7|17|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|O|$]]

Best thing which I use is:

Put a <code>ProgressBar</code> just beside the Login <code>Button</code>.

I have put a progressbar beside it(Whose visibility is set to <code>View.GONE</code>) in the <code>OnCreate</code> method.

When the user clicks on the Login/Submit button, I set the visibility of the button to <code>View.GONE</code> and visibility of <code>ProgressBar</code> to <code>View.VISIBLE</code>.

It looks good and the user cannot click on the button until the work is done, If an error occurs, toggle the visibility to let the user try again

blocks|key|1658624|text|为了暂时解决问题，您可以继续使用Progress+Dialog，并将这一行放在Manifest.xml文件中的Login+Activity's标记中：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1658625|android:configChanges="orientation%7CkeyboardHidden%7CscreenSize"|code-block|syntax|javascript|1658626|使用这一行代码不会影响Progress+Dialog对方向的更改。但根据Android的文档，这被认为是一种错误的做法。|1658627|从长远来看，我建议您保留州的方向变化。|1658628|entityMap^0|G|F|13|C|1J|G|0|0|B|F|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|M|3|N|5|6|7|11|8|@]|D|@]|E|$]]|$1|O|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|P|$]]

For temporarily solving your problem, you can continue using the <code>Progress Dialog</code> and put this line in your <code>Login Activity's</code> tag in <code>Manifest.xml</code> file : 

<pre><code>android:configChanges="orientation|keyboardHidden|screenSize"
</code></pre>

Using this line of code will not affect the <code>Progress Dialog</code> on orientation changes. But it is considered a wrong practice according to Android Development's Documentation. 

In the long run, i recommend you to Preserve the states for orientation changes.

blocks|key|1658705|text|就像@micro.pravi在他的回答中提到的那样，您可以在布局中实现ProgressBar。要在改变方向后保持状态，您必须使用onSaveInstanceState和onRestoreInstanceState来保存和恢复重要的值，即私有变量，如private+boolean+isChecking|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1658706|public+class+MyActivity+extends+Activity+{
++++public+boolean+isProcessing;

++++@Override
++++public+void+onCreate(Bundle+stateBundle)+{
++++++++super.onCreate(stateBundle);
++++++++//+Set+Layout
++++++++setContentView(R.layout.main);

++++++++if(stateBundle!=null)+{
++++++++++++//+read+your+data+here+from+the+bundle
++++++++++++isProcessing+=++stateBundle.getBoolean("isProcessing");
++++++++}

++++++++setUiState(isChecking);
++++}

++++@Override
++++protected+void+onRestoreInstanceState(Bundle+stateBundle)+{
++++++++//+Second+value+of+getBoolean+is+the+default+value
++++++++isProcessing+=++stateBundle.getBoolean("isProcessing",+false);
++++++++super.onRestoreInstanceState(stateBundle);
++++}

++++@Override
++++protected+void+onSaveInstanceState(Bundle+stateBundle)+{
++++++++//+Save+the+critical+data
++++++++stateBundle.putString("isProcessing",+isProcessing);
++++++++super.onSaveInstanceState(stateBundle);
++++}
++++@Override+
++++protected+onResume()+{
++++++++setUiState(isProcessing);
++++}
++++private+setUiState(boolean+processing)+{
++++++++textView.setEnabled(!processing);
++++++++button.setEnabled(!processing);
++++++++progressbar.setVisibility(processing?View.VISIBLE:View.GONE);
++++}
}|code-block|syntax|javascript|1658707|这应该被用来保存任何关于方向改变的关键数据，或者当应用程序被杀死，然后被操作系统恢复。您不必保存TextView数据，因为defautl元素已经自己处理了。也不要以这种方式存储图像数据。相反，将Uri或路径存储到Url并在还原时加载它|1658708|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/18300611/455493^0|Z|B|1S|J|2C|M|3G|Q|H|2|0|0|0|1C|8|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]|$9|Z|A|10|B|C]|$9|11|A|12|B|C]]|D|@$9|13|A|14|1|15]]|E|$]]|$1|F|3|G|5|H|7|16|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|17|8|@$9|18|A|19|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|1A|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

Like @micro.pravi mentioned in his <a href="https://stackoverflow.com/a/18300611/455493">answer</a>, you can implement the <code>ProgressBar</code> inside your layout. To keep the state after an orientation change you have to use <code>onSaveInstanceState</code> and <code>onRestoreInstanceState</code> to save and restore important values, i.e. private variables, like the <code>private boolean isChecking</code>

<pre><code>public class MyActivity extends Activity {
 public boolean isProcessing;

 @Override
 public void onCreate(Bundle stateBundle) {
 super.onCreate(stateBundle);
 // Set Layout
 setContentView(R.layout.main);

 if(stateBundle!=null) {
 // read your data here from the bundle
 isProcessing = stateBundle.getBoolean("isProcessing");
 }

 setUiState(isChecking);
 }

 @Override
 protected void onRestoreInstanceState(Bundle stateBundle) {
 // Second value of getBoolean is the default value
 isProcessing = stateBundle.getBoolean("isProcessing", false);
 super.onRestoreInstanceState(stateBundle);
 }

 @Override
 protected void onSaveInstanceState(Bundle stateBundle) {
 // Save the critical data
 stateBundle.putString("isProcessing", isProcessing);
 super.onSaveInstanceState(stateBundle);
 }
 @Override 
 protected onResume() {
 setUiState(isProcessing);
 }
 private setUiState(boolean processing) {
 textView.setEnabled(!processing);
 button.setEnabled(!processing);
 progressbar.setVisibility(processing?View.VISIBLE:View.GONE);
 }
}
</code></pre>

This should be used to saved any critical data on orientation change or when the App is being killed and later restored by the OS. You don't have to save your <code>TextView</code> data, as the defautl View elements already handle this by themselves. Also do not store Image data this way. Instead store the Uri or path to the Url and load it on restore

I have got an activity where the user can enter host name, user name and password and then click on a "Verify credentials" button. Then the credentials will be checked, which will take some time. In the meantime the user should neither be able to change the credentials nor to click on "Verify" again. So, a modal dialog like the ProgressDialog seems perfect for this.

Unfortunately, ProgressDialog has the well-know limitations regarding orientation changes etc. The guide (<a href="http://developer.android.com/guide/topics/ui/dialogs.html#AlertDialog" rel="nofollow">UI/Dialogs</a>) tells to avoid ProgressDialog at all and use a ProgressBar in the layout instead (like in <a href="http://developer.android.com/design/building-blocks/progress.html" rel="nofollow">Progress &amp; Activity</a>). What does this mean? Shall I create another activity with just one progress bar? Or disable all input fields and put a progress bar on top of it? Sounds quite weird to me... whats your preferred solution?

"Login" activity: ProgressDialog alternative

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我有一个活动，用户可以输入主机名、用户名和密码，然后单击“验证凭据”按钮。然后将检查凭据，这将需要一些时间。同时，用户既不能更改凭据，也不能再次单击“验证”。因此，像ProgressDialog这样的模态对话框似乎非常适合这一点。不幸的是，ProgressDialog在方向更改等方面有着众所周知的限制。指南()告诉我们...

问“登录”活动: ProgressDialog备选方案
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