这是我在 StackOverflow 上的第一篇文章。
基本上，我的应用程序首先检查我的 Sqlite 数据库中是否存在用户记录。如果是，我希望它显示我的主应用程序屏幕。如果没有，我希望显示另一个屏幕，提示用户输入密码。
此密码屏幕是我的应用程序的新增内容。它最初只是显示主屏幕，如下所示：
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
然后我将为用户运行检查。如果找不到用户，我会像这样显示密码屏幕：
Intent myIntent = new Intent(this, loginScreenActivity.class);
startActivityForResult(myIntent, 0);
问题是，如果我决定点击“后退”按钮从密码屏幕退出应用程序，它会返回到主屏幕。
我如何首先运行检查，然后显示两个视图之一？
希望这是有道理的。
提前致谢。
This is my very first post on StackOverflow.
Basically, my app starts by checking to see if a user record exists in my Sqlite Database. If yes, I would like it to display my main application screen. If not, I would like another screen to be displayed, prompting the user for a password.
This password screen is a new addition to my app. It originally just displayed the main screen like so:
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Then I would run the check for a user. If no user is found I display the password screen like so:
Intent myIntent = new Intent(this, loginScreenActivity.class);
startActivityForResult(myIntent, 0);
The problem is, if I decide to hit the BACK button to exit out of the application from the password screen, it goes back to the main screen.
How can I first run the check, then display one of the two views??
Hope this makes sense.
Thanks in advance.
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当您导航到登录屏幕时，在第一个屏幕上调用 finish()
When you navigate to the login screen, call finish() on the first screen
阅读 Activity 文档，这会非常有用有帮助。
如果您不想返回此屏幕，则需要设置 FLAG_ACTIVITY_CLEAR_TOP。
或者第二个，重写 onbackpressed() 方法并在其中使用 finish() 方法。
read the Activity documentation, it will be very helpful.
You need to set the FLAG_ACTIVITY_CLEAR_TOP if you never wan1t go back to this screen.
Or the secont one, override the onbackpressed() method and use finish() method inside in.