blocks|key|481323|text|我的建议是完成你不希望用户返回的活动。例如，在您的登录活动中，在调用startActivity之后立即调用finish()。当用户点击后退按钮时，他们将无法转到登录活动，因为它已从堆栈中删除。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|481324|entityMap^0|Y|D|1H|8|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

My suggestion would be to finish the activity that you don't want the users to go back to. For instance, in your sign in activity, right after you call <code>startActivity</code>, call <code>finish()</code>. When the users hit the back button, they will not be able to go to the sign in activity because it has been killed off the stack.

blocks|key|697124|text|我不确定你到底想要什么，但这听起来应该是可能的，而且听起来你已经在正确的轨道上了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|697125|以下是一些可能有帮助的链接：|697126|Disable+back+button+in+android|offset|length|697127|++MyActivity.java+=>
++++@Override
++++public+void+onBackPressed()+{

+++++++return;
++++}|code-block|syntax|javascript|697128|How+can+I+disable+'go+back'+to+some+activity?|697129|++AndroidManifest.xml+=>
<activity+android:name=".SplashActivity"+android:noHistory="true"/>|697130|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/4779954/disable-back-button-in-android|1|https://stackoverflow.com/questions/6376708/how-can-i-disable-go-back-to-some-activity^0|0|0|0|U|0|0|0|0|19|1|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|12|8|@]|9|@$F|13|G|14|1|15]]|A|$]]|$1|H|3|I|5|J|7|16|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|17|8|@]|9|@$F|18|G|19|1|1A]]|A|$]]|$1|O|3|P|5|J|7|1B|8|@]|9|@]|A|$K|L]]|$1|Q|3|-4|5|6|7|1C|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]|Y|$5|T|U|V|A|$W|Z]]]]

I'm not sure exactly what you want, but it sounds like it should be possible, and it also sounds like you're already on the right track.

Here are a few links that might help:

<a href="https://stackoverflow.com/questions/4779954/disable-back-button-in-android">Disable back button in android</a>

<pre><code> MyActivity.java =&gt;
 @Override
 public void onBackPressed() {

 return;
 }
</code></pre>

<a href="https://stackoverflow.com/questions/6376708/how-can-i-disable-go-back-to-some-activity">How can I disable &#39;go back&#39; to some activity?</a>

<pre><code> AndroidManifest.xml =&gt;
&lt;activity android:name=".SplashActivity" android:noHistory="true"/&gt;
</code></pre>

blocks|key|481251|text|finish()提供了关闭当前活动而不是整个应用程序的方法。你最好不要试图寻找杀死应用程序的方法。小小的建议。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|481252|你有没有试过Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS+%7C+Intent.FLAG_ACTIVITY_NO_HISTORY的合取？记住在Intent启动活动中使用此标志！|481253|entityMap^0|0|8|0|6|23|2G|6|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|R|8|@]|D|@]|E|$]]]|I|$]]

<code>finish()</code> gives you method to close current Activity not whole application. And you better don't try to look for methods to kill application. Little advice.

Have you tried conjunction of <code>Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS | Intent.FLAG_ACTIVITY_NO_HISTORY</code>? Remember to use this flags in <code>Intent</code> starting activity!

blocks|key|697355|text|将finish()放在后面|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|697356|Intent+i+=+new+Intent(Summary1.this,MainActivity.class);
++++++++++++startActivity(i);
finish();|code-block|syntax|javascript|697357|entityMap^0|1|8|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

Put <code>finish()</code> just after 

<pre><code>Intent i = new Intent(Summary1.this,MainActivity.class);
 startActivity(i);
finish();
</code></pre>

blocks|key|697401|text|如果您不想返回到应用程序上的所有活动，可以使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|697402|android:launchMode="singleTask"|code-block|syntax|javascript|697403|点击此处了解更多信息：http://developer.android.com/guide/topics/manifest/activity-element.html|offset|length|697404|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.android.com/guide/topics/manifest/activity-element.html^0|0|0|B|20|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

If you don't want to go back to all the activities on your application, you can use 

<pre><code>android:launchMode="singleTask"
</code></pre>

Learn more here: <a href="http://developer.android.com/guide/topics/manifest/activity-element.html" rel="nofollow">http://developer.android.com/guide/topics/manifest/activity-element.html</a>

blocks|key|697199|text|Paulsm4的答案是正确的。如果在onBackPressed()中你只是返回，它将禁用后退按钮。然而，我认为考虑到您的用例，更好的方法是翻转活动逻辑，即将您的家庭活动作为主要活动，检查用户是否在那里登录，如果没有，则启动登录活动。原因是，如果你覆盖了主活动中的后退按钮，当用户按下后退按钮时，大多数用户会感到困惑，而你的应用程序什么也不做。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|697200|entityMap^0|I|F|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

paulsm4's answer is the correct one. If in <code>onBackPressed()</code> you just return, it will disable the back button. However, I think a better approach given your use case is to flip the activity logic, i.e. make your home activity the main one, check if the user is signed in there, if not, start the sign in activity. The reason is that if you override the back button in your main activity, most users will be confused when they press back and your app does nothing.

blocks|key|697322|text|只需重写onKeyDown方法并检查是否按下了back按钮。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|697323|@Override
public+boolean+onKeyDown(int+keyCode,+KeyEvent+event)+
{
++++if+(keyCode+==+KeyEvent.KEYCODE_BACK)+
++++{
++++++++//Back+buttons+was+pressed,+do+whatever+logic+you+want
++++}

++++return+false;
}|code-block|syntax|javascript|697324|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Just override the onKeyDown method and check if the back button was pressed.

<pre><code>@Override
public boolean onKeyDown(int keyCode, KeyEvent event) 
{
 if (keyCode == KeyEvent.KEYCODE_BACK) 
 {
 //Back buttons was pressed, do whatever logic you want
 }

 return false;
}
</code></pre>

blocks|key|481570|text|@Override
public+void+onBackPressed()+{
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|481571|创建onBackPressed()时，只需删除super.onBackPressed();，这应该可以正常工作|unstyled|offset|length|style|CODE|481572|entityMap^0|0|2|F|N|M|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|N|8|@$G|O|H|P|I|J]|$G|Q|H|R|I|J]]|9|@]|A|$]]|$1|K|3|-4|5|F|7|S|8|@]|9|@]|A|$]]]|L|$]]

<pre><code>@Override
public void onBackPressed() {
}
</code></pre>

When you create <code>onBackPressed()</code> just remove <code>super.onBackPressed();</code>and that should work

blocks|key|697267|text|放|type|unstyled|depth|inlineStyleRanges|entityRanges|data|697268|finish();|code-block|syntax|javascript|697269|在ActivityStart之后立即停止该活动，防止以任何方式返回该活动。然后添加|697270|onCreate(){
++++getActionBar().setDisplayHomeAsUpEnabled(false);
++++...
}|697271|添加到您要启动的活动。|697272|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Put

<pre><code>finish();
</code></pre>

immediately after
 ActivityStart
to stop the activity preventing any way of going back to it. 
Then add

<pre><code>onCreate(){
 getActionBar().setDisplayHomeAsUpEnabled(false);
 ...
}
</code></pre>

to the activity you are starting.

When the BACK button is pressed on the phone, I want to prevent a specific activity from returning to its previous one.

Specifically, I have login and sign up screens, both start a new activity called <code>HomeScreen</code> when successful login/signup occurs. Once HomeScreen is started, I want to prevent the users from being able to return to the login or sign up screens by pressing the BACK key. 

I tried using <code>Intent.FLAG_ACTIVITY_NO_HISTORY</code>, but since the application has Facebook integration, when the 'Login with Facebook' is used, Facebook should return to the initial login screen, therefore I should keep a history of these activities.

I thought of overriding the behaviour of the BACK button on <code>HomeScreen</code> to directly finish an application when the button is pressed and I used

<pre><code>@Override
public void onBackPressed() {
 finish();
}
</code></pre>

but that also does not work.

How to prevent going back to the previous activity?

当按下电话上的后退按钮时，我希望阻止特定活动返回到之前的活动。具体地说，我有登录和注册屏幕，当成功登录/注册时，这两个屏幕都会启动一个名为HomeScreen的新活动。一旦启动了HomeScreen，我希望阻止用户通过按BACK键返回登录或注册屏幕。我尝试使用Intent.FLAG_ACTIVITY_NO_HISTORY，但由于应用程序集成了Facebook，当使用‘登录Facebook’时，Fa

问如何防止返回到之前的活动？
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