how to initialize a string [] with a string-array of Android resources?

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how to initialize a string [] with a string-array of Android resources?

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#1 by (2 votes)
#2 by (1 votes)

2

That wave friends, I would like to know about the question, what happens is that I have this:

String[] data = {"Ejemplo 1", "Ejemplo 2", "Ejemplo 3", "Ejemplo 4"};

and I have this string arrangement in my resources:

<string-array
name="ejemplos">
    <item>Ejemplo 1</item>
    <item>Ejemplo 2</item>
    <item>Ejemplo 3</item>
    <item>Ejemplo 4</item>
</string-array>

I would like to initialize or equalize the "examples" of resources in the data variable.

I'm trying this way but it throws me an exception

private String[] data = getResources().getStringArray(R.array.ejemplos);

and this is the error

Attempt to invoke virtual method 'android.content.res.Resources android.content.Context.getResources ()' on a null object reference

I hope you answer, thank you in advance

java android

asked by Luis García 02.05.2017 в 23:22

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2 answers

1

You are getting this error because access to resources requires the context:

Attempt to invoke virtual method 'android.content.res.Resources android.content.Context.getResources () 'on a null object reference

which can not be obtained by defining the obtained values of the array.

private String[] data = getResources().getStringArray(R.array.ejemplos);

To solve this, you must first define the variable of the array:

private String[] data;

and then get the data, remember that you require the context, but if you are in an Activity you can simply get them in this way:

data = getResources().getStringArray(R.array.ejemplos);

answered by 03.05.2017 в 02:47

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score 2 · Accepted Answer

Assuming that your array is in the right place, in resources.

You can not access it before the resources have been loaded.

If you proceed like this it should work:

   public class MainActivity extends Activity {


    String[] data;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.tulayout);
        //Aquí los recursos han sido cargados, entonces puedes invocar el array

        data = getResources().getStringArray(R.array.ejemplos); 
        System.out.println (data);   

    }

    @Override
    protected void onResume() {
        super.onResume();
        //...
    }


  }