Thread: Java: Using string resource in external class

Hi everyone, am new to Java. During development I needed to use string resources. I can fetch them from strings.xml for the layout xml file and for the MainActivity.java file (using getString(R.string.name)). But I can't get to use them in an external class file (which is being used to handle all the functions of the MainActivity file).

I have gone through StackOverflow forum and tried many answers but in vain. I tried using:

1. Resources.getSystem().getString(R.string.name)
2. getResources.getString(R.string.name)

I have a orderProcessing button in mainActivity.java which gets processed in orderSummary function in mathCalculator.java. Everything works out fine when I use hardcoded strings. I just can't get to use the string resources from strings.xml to reference them.

Please help out in this regard. Many thanks

This is my "strings.xml" file:

<code>
<resources xmlns: xliff="urnasis:names:tcliff:document:1.2">
<string name="app_name">Java Doughnut Corner</string>
<string name="name">Name: <xliff:g id="name">%s</xliff:g></string>
<string name="doughnuts"><xliff:g id="doughnuts">%i</xliff:g> Doughnuts ordered.</string>
<string name="total">Total Price: £<xliff:g id="total">%i</xliff:g></string>
<string name="thanks">Thank You...</string>
</resources>
</code>

This is the onClickListener from "MainActivity.java" file which calls upon the function in external class:

<code>
order.setOnClickListener(view -> {
MathCalculator calculator = new MathCalculator();
calculator.setCustomer(String.valueOf(name.getText ()));
result.setText(calculator.summary(calculator.addit ivePrice(additive)));
}
calculator.setSummary("");
});
</code>

This is the function from "mathCalculator.java" file (external class):

<code>
public String summary(int additiveTotal){
String message = additives();
summary = getString(R.string.name, customer) + "\n";
summary += message + "\n";
summary += getString(R.string.doughnuts, quantity) + "\n";
summary += getString(R.string.total, additiveTotal) + "\n";
summary+= getString(R.string.thanks);
return summary;
}
</code>

Yes, this is an Android App.

I am using Android Studio for Java development. The strings.xml file is in res folder.

The posted code compiles without errors but the app crashes when reaching the said function. The getString method doesn't print anything in the log when it gets executed because the app crashes on the statement.

The getString method is a native method and i am not sure to which class it belongs.