Develop Reference

Android-Studio: How to make a resource string value the same as its name

I want to use the string resources to save some key values. So, I have something like this:
<string name="key_name">key_name</string>
The resource name and the resource value are the same. There is no need for me to make a difference between them, as it is just to cleanly store one value.
To reduce redundant information,
is there a way to just tell android-studio that the name equals the value? Something like this?
<string name="key_name"/>

I think you can't do it. It looks like you create a variable, you must name it and when you need you can set its value.
You can't create a variable with same values with name at the same time.

I think you have the wrong resource type. A string resource is used for mapping a name to a text. From what you're describing here you only need the name (and then can extrapolate the text from it).
Using strings with matching name and value shouldn't be necessary:
If you're going to be referencing them from Java or Kotlin code, you still need to know the name (i.e. R.string.key_name), so you might as well just use the string value there.
If it's for using inside XML code (where you want to pass the value of a string, e.g. text="#string/key_name") most of the time you can just use the raw string there (i.e. text="key_name").

How to reset string value from java in Android?

I'm a beginner in Android, so I hope everyone can help me to change String in strings.xml from programming.
Here is the original string:
<string name="cv_name">Hong Sengheng</string>
And I want to reset it's value to Sengheng.
<string name="cv_name">Sengheng</string>
So, hopefully everyone give me idea.

One thing what you have to understand here is that, when you provide a data as a Resource, it can't be modified during run time. For example, the drawables what you have in your drawable folder can't be modified at run time. To be precise, the "res" folder can't be modified programatically.
This applies to Strings.xml also, i.e "Values" folder. If at all you want a String which has to be modified at runtime, create a separate class and have your strings placed in this Class and access during run time.

You can not change the value of String.xml at runtime but you can change the text of that particular Ui where you pass that String...

You cann't change the value of string.xml at the runtime for this u can make a seprate class and change string value at the run time and use it

while the value of a resource should not be changed programmatically you can certainly assign a string resource to a variable String mystring = getResources().getString(R.string.mystring_res); and then change that variable's value mystring="new value";

Can I store numeric constants in the values folder?

For string constants the values folder can already be used to store global values.
Can the same thing be done for numeric values?
Or am I obliged to declare all the constants in a singleton (or Application implementation)?

If you need to store integer values you can still use Integer Resource Style. Unfortunately float values are not supported as resource types. Take a look at official documentation for further informations.
Eventually you can always use a simple class full of static fields if that fits your needs.

How to access values from "strings.xml" dynamically in android?

App version 2.3.3
Here is what i am looking for...
I have few strings in "values/strings.xml". I wish to retrieve the values depending on the string's "name" attribute and use it my application. The input to which string in the xml should be used comes dynamically. Here is an example...
My input from other file :: "A" => This value changes. It can be any value in A,B,C,D.
I have different strings in strings.xml, like...
<string name="A">AforApple</string>
<string name="B">BforBall</string>
<string name="C">CforCat</string>
<string name="D">DforDog</string>
Now, how do i programmatically get the value(AforApple) of the String with name="A".

String str = context.getResources().getString(R.string.A)
or u can use
textBox.setText(R.string.A);
do not forget to import the package com.yourpackackage.R.

You need to use getResources() method:
String a = getResources().getString(R.string.A);

Just for the record, you can also dynamically generate it using reflection.
int stringRes=R.string.class.getField("Here you put the dynamically generated input, such as A").getInt(null);
textView.setText(stringRes);
This will return the resource int value from string XML based on the input, as long as the input value "A" matches string name in the XML, this will retrieve them dynamically.

To access a String resource/value that you’ve defined in an XML file from your Android/Java code, use the Android getString method, like this:
String A = getString(R.string.a_string);

If your code gets a string like "A" and you are trying to dynamically find the string in your resources that matches that name, I don't think you can do that.
Instead of using the strings.xml, you might want to use arrays.xml and build a HashMap from that before you need to access those strings

Try this:
String word = getResources().getString(R.string.A);
Check out the link here.

You can use this code:
getText(R.string.A);
Basically, you need to pass the resource id as a parameter to the getText() method.

Use Java constants in arrays defined by XML

I have an array like this that defines the entry values for a ListPreference:
<string-array name="sortSelectionEntryValues">
<item>0</item>
<item>1</item>
</string-array>
Now instead of using 0 and 1 in XML, I want to use Java constants like e.g. ORDER_ASC and ORDER_DESC, because later I will access the value of the selected ListPreference entry programmatically and I have to check the value in code, but comparing the value to a well named constant makes code easier to read.
So what I want is something like that:
In Java:
class MyOrderClass
{
public static final String ORDER_ASC="0";
public static final String ORDER_DESC="1";
}
In the XML:
<string-array name="sortSelectionEntryValues">
<item>MyOrderClass.ORDER_ASC</item>
<item>MyOrderClass.ORDER_DESC</item>
</string-array>
Is that somehow possible? Thanks for any hint!
(Please note, the ordering is just a dumb example, I just need to know how to integrate Java constants into the XML definition of an array)

That's not possible. That said, you will never have to compare "0" to anything. You will likely use if(MyOrderClass.ORDER_ASC.equals(<selected item from list>){..} so it shouldn't be an issue.

You cant do it the way that you suggest, but...
You could probably do it a different way and define the constant in XML in a values file and define both your static in java, and your array in XML in terms of the defined value. This way it is only defined once and the same value is used.