NullPointerException trying to access a String resource

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耶瑟儿~
耶瑟儿~ 2021-01-18 07:56

I have the following /res/values/uris.xml



blahblah

        
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3条回答
  • 2021-01-18 08:31

    First, make sure these values are in the file strings.xml.

    Also, you can't access the strings from the constructor. The application context is not yet initialized. You should do it in onCreate().

    Emmanuel

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  • 2021-01-18 08:46

    First of all to clear that up. You don't have to have all your strings in strings.xml. Period.

    Emmanuels answer is partially right. You have to get the string inside your onCreate() method when the context is initialized. His answer is only partially correct since he also mentioned that you have to have the strings inside the strings.xml which is not true.

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  • 2021-01-18 08:50

    My guess you placed bladderUrl smth like this:

    public class YourActivity extends Activity {
        private String bladderUrl = getString(R.string.bladder);
    
        @Override
        public void onCreate(Bundle savedInstanceState) {
    
    ...
    

    However you need to do smth like this:

    public class YourActivity extends Activity {
        private String bladderUrl;
    
        @Override
        public void onCreate(Bundle savedInstanceState) {
    
            bladderUrl = getString(R.string.bladder);
    ...
    
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