您好，亲爱的，我将我的应用程序附加到 firbase adabase，所以它崩溃了。 我已经尝试了太多来解决这个问题，但无法摆脱请帮助我

Question

I have problem of crashing app whenever open this script

Answer 1

Well, looks like a classic problem of variable not initialized.

In the stacktrace (the text reported back to you with the reason of the error) you got a NullPointerException this means you have a place in your code with a variable pointing to nothing (aka null ).

Usually when you define a variable in java like this:

String myVariable;

You are not assigning any value, which means the variable has null information. Then you cannot call methods or do anything with that variable.

Currently, for the screenshot you shared, that's your problem. My guess is that around line 271 when you try to access Pinb.length() your variable does not contain any value.

So your problem is more about what you are trying to access and not a Firebase problem. Check your code and check that it actually assigns a value to your variables before accessing them. You can even check for a null and see that your code will compile:

if(Pinb.= null && Pinb.legnth() < 6) { //your code here... }

Also check your if as usually if statements does not end with ;because that means something like: hey check this expression and do nothing .

Answer 2

Check the billing plan.

or:

1. Sign into Firebase, then open your project.
2. Click the Settings icon, then select Project settings.
3. In the Your apps card, add an app:

If you have no apps in your project: Click the icon for the app's platform, then follow the setup workflow.

If you already have apps in your project: Click Add app, then follow the setup workflow. Note that you can also add an app to your project from the console's main overview page of your Firebase project.

https://youtu.be/iosNuIdQoy8