Grender Grender - 1 month ago 17
Android Question

"You need to use a Theme.AppCompat theme (or descendant) with the design library" error

I'm getting "You need to use a Theme.AppCompat theme (or descendant) with the design library" error every time even if I'm obviously using an AppCompat Theme (a descendant one).

dependencies:

compile 'com.android.support:appcompat-v7:23.3.0'
compile 'com.android.support:design:23.3.0'
compile 'com.android.support:support-v4:23.3.0'


layout:

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/tooltip_container"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:visibility="gone">

<ImageView
android:id="@+id/tooltip_image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:adjustViewBounds="true"/>

<android.support.design.widget.FloatingActionButton
android:id="@+id/fab_delete_image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_anchor="@id/tooltip_image"
app:layout_anchorGravity="top|end"/>

</android.support.design.widget.CoordinatorLayout>


theme:

<style name="TranslucentAppTheme" parent="Theme.AppCompat.Light.NoActionBar">
<item name="android:windowIsTranslucent">true</item>
<item name="android:windowBackground">@android:color/transparent</item>
<item name="android:windowContentOverlay">@null</item>
<item name="android:windowNoTitle">true</item>
<item name="android:windowIsFloating">true</item>
<item name="android:backgroundDimEnabled">false</item>
</style>


manifest:

<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/TranslucentAppTheme">
<activity android:name=".MainActivity">
(...)
</activity>


I'm inflating the layout inside a service:

tooltipContainer = (CoordinatorLayout) LayoutInflater.from(this).inflate(R.layout.tooltip_layout, null);

Answer

Create a ContextThemeWrapper to wrap the Service's Context with your custom theme, and get the LayoutInflater from that.

ContextThemeWrapper ctx = new ContextThemeWrapper(this, R.style.TranslucentAppTheme);
tooltipContainer = (CoordinatorLayout) LayoutInflater.from(ctx)
    .inflate(R.layout.tooltip_layout, null);

The ContextThemeWrapper modifies the given Context's theme with the one you specify in the constructor. Since a Service doesn't really have a theme, it just tacks yours onto the Service's Context, then the LayoutInflater has the appropriate theme to inflate the design Views.

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