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

For my case, this issue started showing up after migrating to AndroidX. The scenario was I implemented custom views that extends AppCompatEditText and set custom styles as well. I ran into this issue while running the unit tests.

The error logs show this as the root cause:

Caused by: java.lang.UnsupportedOperationException: Failed to resolve attribute at index 13: TypedValue{t=0x2/d=0x7f0300f9 a=2}
    at android.content.res.TypedArray.getDrawableForDensity(TypedArray.java:946)
    at android.content.res.TypedArray.getDrawable(TypedArray.java:930)

In the styles I was using Base.Widget.AppCompat.EditText:

Changing the parent to Android's base android:Widget.EditText removed the error and didn't change any behavior/UI for me.

It's strange since digging through the inheritance structure of Base.Widget.AppCompat.EditText, the root parent is also android:Widget.EditText.