Android float/double resource type

Question

As I understood from available Android Resource types, there is no straight way to use float values as resources, unless you use some hacks such as the one mentioned in here

Answer 1

Just save your double as a String resource

<string name="some_decimal">0.12154646</string>

And then just parse that in your code like this

double some_decimal = Double.parseDouble(context.getString(R.string.some_decimal));

You can also make your own type of resource values and get it from there like this

<item name="some_decimal" type="vals" format="float">2.0</item>

And then get it like this

TypedValue tempVal = new TypedValue();
getResources().getValue(R.vals.some_decimal, tempVal, true);
float some_decimal = tempVal.getFloat();

But it's impossible to get doubles like this and also I think that it's less performant than just simply parsing a string resource, so I prefer my first option.

Answer 2

Add a float to dimens.xml:

<item format="float" name="my_dimen" type="dimen">0.54</item>

To reference from XML:

<ImageView 
    android:alpha="@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);

Answer 3

No, There is no direct resource type is provided for float/double.

But Yes there is two hacks to do that.

1) In dimens.xml

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

Referencing from java

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

And Second is as Bojan and Haresh suggested, To use value as string and parse it in your code at runTime.