Add floating point value to android resources/values

user_323715 0
Viewed 113254

I'm trying to add a little space between lines to my TextViews using android:lineSpacingMultiplier from the documentation:

Extra spacing between lines of text, as a multiplier.

Must be a floating point value, such as "1.2".

As I'm using this in a few different TextViews I would like to add a global dimension/value to my resources, but I don't know which tag to use, if it even exists. I have tried all resource types that make sense to me, but none of them works.

What I would like to have would be something like this:

<resources>
    <dimen name="text_line_spacing">1.4</dimen>
</resources>

Edit: I'm aware of android:lineSpacingExtra (which needs a dimension with an appended unit), but I'd like to use android:lineSpacingMultiplier if possible.

floating-point resources android
12 Answers

As described in this link http://droidista.blogspot.in/2012/04/adding-float-value-to-your-resources.html

Declare in dimen.xml

<item name="my_float_value" type="dimen" format="float">9.52</item>

Referencing from xml

@dimen/my_float_value

Referencing from java

TypedValue typedValue = new TypedValue();
getResources().getValue(R.dimen.my_float_value, typedValue, true);
float myFloatValue = typedValue.getFloat();
user_29154590

Add a float to dimens.xml:

<item format="float" name="my_dimen" type="dimen">1.2</item>

To reference from XML:

<EditText 
    android:lineSpacingMultiplier="@dimen/my_dimen"
    ...

To read this value programmatically you can use ResourcesCompat.getFloat from androidx.core

Gradle dependency:

implementation("androidx.core:core:${version}")

Usage:

import androidx.core.content.res.ResourcesCompat;

...

float value = ResourcesCompat.getFloat(context.getResources(), R.dimen.my_dimen);
user_1887790

We can also use it for the guideline of the constraint layout.

Create integer.xml file and add into

 <item name="guideline_button_top" type="integer" format="float">0.60</item>

Use from a layout.xml file

 app:layout_constraintGuide_percent="@integer/guideline_button_top"
user_43561450

If you have simple floats that you control the range of, you can also have an integer in the resources and divide by the number of decimal places you need straight in code.

So something like this

<integer name="strokeWidth">356</integer>

is used with 2 decimal places

this.strokeWidthFromResources = resources_.getInteger(R.integer.strokeWidth);    
circleOptions.strokeWidth((float) strokeWidthFromResources/ 100);

and that makes it 3.56f

Not saying this is the most elegant solution but for simple projects, it's convenient.

user_36034990

Although I've used the accepted answer in the past, it seems with the current Build Tools it is possible to do:

   <dimen name="listAvatarWidthPercent">0.19</dimen>

I'm using Build Tools major version 29.

user_31755800

The float or double parameter can be stored as a string:

<resources>
    <string name="x">0.01</string>
</resources>

and then obtained as:

double value = Double.parseDouble(this.getString(R.string.x));

Use java.lang.Float.parseFloat() if you want x parsed to a float.

user_128651250

If somebody is interested in "tricking the system" when you are allowed to give only specific types of xml values, especially when using xml values for embedded weights in android layout formatting, you could do something like this:

    <item name="actvity_top_panel_weight" format="float" type="integer">1.5</item>

The xml value above acts like a float but is called an integer.

Then you could use it as the following without a problem:

        <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="@integer/actvity_top_panel_weight"
        android:orientation="horizontal"></LinearLayout>
user_130934130
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