Android XML: RuntimeException: Failed to resolve attribute at index 6

Question

Hello dear stackoverflower,

In my project, i am using the new \"android design library\". The problem is, that there is a runtime exception which says(Im trying to c

Answer 1

Had the same issue because have used getApplicationContext() instead of Activity to retrieve LayoutInflater and inflate item view for list adapter.

Answer 2

I was using a custom attribute in attrs.xml and a customview. I ran into this problem as I didn't specify theme: attribute in the custom view. Quick look of how the files look

attrs.xml

<resources>
    <attr name="textColorPrimary" format="reference" />
    ...
</resources>

customview.xml

<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/tvText"
    style="@style/TitleBlackThin"
    android:theme="@style/AppTheme"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center_vertical"
    android:padding="16dp"
    android:text="@string/text" />

In my styles.xml, I extended my style to use AppTheme

<resources>
    <style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
         <item name="textColorPrimary">@color/black</item>
    </style>
 ...
    <style name="TitleBlackThin">
        <item name="android:textSize">20sp</item>
        <item name="android:fontFamily">sans-serif-light</item>
        <item name="android:textStyle">normal</item>
        <item name="android:textColor">?textColorPrimary</item>
    </style>
...
</resources>

The culprit here was custom attribute ?textColorPrimary. As I didn't define AppTheme in the customview, it wasn't able to determine how to load textColorPrimary. By android:theme="@style/AppTheme", this got fixed))

Answer 3

Make sure your theme .

My theme :

<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
    <!-- Customize your theme here. -->
    <item name="colorPrimary">#2196F3</item>
    <item name="colorPrimaryDark">#1565C0</item>
    <item name="colorAccent">#E91E63</item>
</style>

Answer 4

In my case, I had an error at setContentView(R.layout.my_layout). In my_layout, I was using app:errorEnabled="true" in a TextInputLayout which caused the error. Removed that line, and it worked.