The following classes could not be instantiated android.support.v7.widget.AppCompatTextView

Question

Here are my dependencies of build.gradle(app)

compile fileTree(include: ['*.jar'], dir: 'libs')
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', 
{
    exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.firebaseui:firebase-ui-auth:2.3.0'
compile 'com.android.support:appcompat-v7:26.0.1'
compile 'com.android.support:design:26.0.1'
compile 'com.android.support:support-vector-drawable:26.0.1'
compile 'com.android.support.constraint:constraint-layout:1.0.2'
testCompile 'junit:junit:4.12'

Here is a part of build.gradle(Project)

allprojects {
    repositories {
        jcenter()
        maven { url "https://maven.google.com" }
    }
}

When I am going to any xml file it is showing me an error **The following classes could not be instantiated:

android.support.v7.widget.AppCompatTextView (Open Class, Show Exception, Clear Cache)**

I have updated Android Studio to the latest still it shows the error.

I am unable to figure out the problem.Thank you

have you tried to clean the project? some times its the issue due to sudden closing of AS. — Umar Hussain, Aug 24 '17 at 14:09
try to invalidate the cache like this : https://stackoverflow.com/a/29921076/4428159 — Umar Hussain, Aug 24 '17 at 14:11
i cleaned and rebuild the project and invalidate cache many times — Eco4ndly, Aug 24 '17 at 14:11
everything was fine until I was using `26.0.0-alpha1` . The problem arrised when I changed the version to `26.0.1` — Eco4ndly, Aug 24 '17 at 14:15
Same error in my [question](https://stackoverflow.com/questions/45802406/adding-maven-repository-causes-an-error-android-support-v7-widget-appcompattex). — Lalit Fauzdar, Aug 25 '17 at 12:00

Lalit Fauzdar · Answer 1 · 2017-08-26T03:25:36.657

26

EDIT

Whenever You'll add maven repository, this problem will occur.
See same error I'm facing on a question asked by my friend here as I can't ask.

This can be solved by changing AppTheme in res -> values -> Styles.xml change your theme from

<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">

to

<style name="AppTheme" parent="Base.Theme.AppCompat.Light.DarkActionBar">

It solved mine and don't forget the actual answer.

edited Aug 26 '17 at 03:25

answered Aug 25 '17 at 12:06

Lalit Fauzdar

5,953
2
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50

Yes. I changed to 26.0.0-alpha1 and the issue is resolved but when i am trying to use firebase ui library 26.0.1 version is required. How to use 26.0.1 version? – Eco4ndly Aug 25 '17 at 15:41
What about `NoActionBar` in `Base`. What is the replacement for `Theme.AppCompat.NoActionBar`? – Mario Velasco Sep 14 '17 at 16:32
@MarioVelasco you can use this very same theme as using noactionbar is not compulsory, even I don't have action bar but still I'm using this... It causes no conflict. – Lalit Fauzdar Sep 14 '17 at 16:36
@LalitSinghFauzdar `Base.Theme.AppCompat.Light.DarkActionBar` will create a default `ActionBar`. I 'm looking for a `NoActionBar` theme that solves the problem of this post. – Mario Velasco Sep 14 '17 at 16:43
@LalitSinghFauzdar The `ActionBar` created with the `Base.Theme.AppCompat.Light.DarkActionBar` is not in the xml, it cannot be deleted. – Mario Velasco Sep 14 '17 at 16:49
@LalitSinghFauzdar even an empty xml with that theme will create an `ActionBar` – Mario Velasco Sep 14 '17 at 16:56
1

I used the `Base` theme together with `false` and `true` in order to get an activity without `ActionBar` – Mario Velasco Sep 14 '17 at 17:17
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/154469/discussion-between-mario-velasco-and-lalit-singh-fauzdar). – Mario Velasco Sep 14 '17 at 17:22

score 4 · Answer 2 · edited Aug 28 '18 at 04:30

4

I had the same error while using Theme.AppCompat.NoActionBar

<style name="AppTheme" parent="Theme.AppCompat.NoActionBar">

I replaced it by and it works fine:

<style name="AppTheme" parent="Base.Theme.AppCompat">
    <item name="windowActionBar">false</item>
    <item name="windowNoTitle">true</item>
</style>

edited Aug 28 '18 at 04:30

Morteza Jalambadani

2,190
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answered Dec 14 '17 at 10:31

Slel

63
6

Thank you for this. I am going throw the book "Head First Android Development A Brain-Friendly Guide" And this is the only good solution on the internet. – Dime Jan 04 '22 at 18:19

score 3 · Answer 3 · answered Aug 25 '17 at 10:54

3

In styles.xml,

Changing the theme from Theme.AppCompat.Light.DarkActionBar to Base.Theme.AppCompat.Light.DarkActionBar has worked for me.

Credit goes to: https://stackoverflow.com/a/45399080/8111914

answered Aug 25 '17 at 10:54

Namita

49
9

score 3 · Answer 4 · edited Jun 26 '20 at 22:16

If you have encountered one of these errors pasted below, you might need to review your settings in styles.xml files. I encountered this problem after I changed my build Tools in build.gradle file from buildToolsVersion '23.0.0' to buildToolsVersion '26.0.2'

To specifically solve the problem, if you have a line similar to this

<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">

change it to include the Base prefix, for instance in my case I changed from

<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">

to

<style name="AppTheme" parent="Base.Theme.AppCompat.Light.DarkActionBar">

and everything worked fine.

The following classes could not be instantiated:

- android.support.v7.widget.AppCompatImageView (Open Class, Show Exception, Clear Cache)

- android.support.v7.widget.AppCompatButton (Open Class, Show Exception, Clear Cache)

- android.support.v7.widget.Toolbar (Open Class, Show Exception, Clear Cache)

- android.support.v7.widget.AppCompatEditText (Open Class, Show Exception, Clear Cache)

- android.support.v7.widget.AppCompatTextView (Open Class, Show Exception, Clear Cache)

- android.support.v7.widget.ActionBarContextView (Open Class, Show Exception, Clear Cache)

- android.support.v7.app.WindowDecorActionBar (Open Class, Show Exception, Clear Cache)

- android.support.v7.widget.ActionBarOverlayLayout (Open Class, Show Exception, Clear Cache)

score 0 · Answer 5 · answered Feb 03 '18 at 15:40

0

I had a hard corded color value and after removing it everything worked just fine

answered Feb 03 '18 at 15:40

King Sean Daniel

1

Rishab Jula · Answer 6 · 2018-11-16T12:41:32.707

0

Please change the theme style in res -> values -> Styles.xml

From : <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">

To : <style name="AppTheme" parent="Base.Theme.AppCompat.Light.DarkActionBar">

edited Nov 16 '18 at 12:41

answered Nov 16 '18 at 12:35

Rishab Jula

97
4

score -1 · Answer 7 · edited Aug 07 '18 at 09:31

-1

This can be solved by changing AppTheme in res -> values -> Styles.xml change your theme from

<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">

to

<style name="AppTheme" parent="Base.Theme.AppCompat">

edited Aug 07 '18 at 09:31

Micer

8,731
3
79
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answered Aug 07 '18 at 09:06

Rahim Moghaddam

1

The following classes could not be instantiated android.support.v7.widget.AppCompatTextView

7 Answers7