CODEWITHSUNDEEP
androidandroid-studioandroid-theme
Nick Pampoukidis
Nick Pampoukidis

Reputation: 742

Android studio layout preview does not get my current theme

I have a test multi-module project and some modules does not see my application theme. In more detail, the modules are the following: app, common, home & details.

The app module contains an activity and the navigation, the common contains strings & the style and home/detail contain a dummy fragment. All fragments implement the common module which contains my style.

// Modules
implementation project(path: ':navigation')
implementation project(path: ':common')

So when I go to the activity's layout editor and try to change the theme from the preview, I can see and select my theme. activity_main.xml

But I go to HomeFragment's layout no such option exists. fragment_home.xml

Of course the style works as expected when I run the application, the only problem is that the preview does not work. Here is the theme which is on the common module:

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <style name="AppTheme" parent="Theme.Leanback.Browse">
        <!-- Theme.AppCompat compatibility: -->
        <item name="windowActionBar">false</item>
        <item name="windowNoTitle">true</item>

        <!-- Theme.MaterialComponents compatibility: -->
        <item name="colorPrimary">#171717</item>
        <item name="colorPrimaryVariant">#212121</item>
        <item name="colorAccent">#DD1C1A</item>
        <item name="colorOnPrimary">#eeeeee</item>
        <item name="colorSecondary">#FFEB3B</item>
        <item name="colorSecondaryVariant">#FFC107</item>
        <item name="colorOnSecondary">#eeeeee</item>
        <item name="colorSurface">#2196F3</item>
        <item name="colorOnSurface">#eeeeee</item>

    </style>

</resources>

One thing that I observed during my trial and error is that if I change my theme parent from Leanback to Theme.AppCompat the preview works but I can not do that since I need Leanback. Finally, all the modules except the app one are library modules apply plugin: 'com.android.library'

My setup is a windows 10 PC and I am using Android studio 4 canary 8. I have tested this also on Android studio 4 canary 2 with the same results.

Edit: Solution Set default theme on module manifest, thanks @Martin Zeitler

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.home">

    <application android:theme="@style/AppTheme" />
</manifest>

Upvotes: 2

Views: 2138

Answers (1)

Martin Zeitler
Martin Zeitler

Reputation: 76689

You could assign a default theme in the AndroidManifest.xml, by adding android:theme to the application node. This should also work for library modules, since they have an empty application node, where one can define the default theme for the XML preview.

Upvotes: 5

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