error when adding support design

Question

error when adding support design renderring problems occure then adding library , and using API 26 , and i already added maven in reporesetires and added dependencies but same problems. tryed to to clean and rebuild same problem. tryed to invalidate cashes same problem.

this is my codes.

Main_Layout

Faild to instiantiate one or more classes
The following classes could not be instantiated
- android.support.v7.widget.AppCompatTextView (Open Class, Show Exception, 
  Clear Cache)

Gradle Module

    apply plugin: 'com.android.application'

    android {
    compileSdkVersion 26
    buildToolsVersion "26.0.1"
    defaultConfig {
    applicationId "com.example.mac.floating"
    minSdkVersion 19
    targetSdkVersion 26
    versionCode 1
    versionName "1.0"
    testInstrumentationRunner 
    "android.support.test.runner.AndroidJUnitRunner"
     }
    buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 
       'proguard-rules.pro'
    }
    }
   }

dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', 
{
    exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:26.+'
compile 'com.android.support.constraint:constraint-layout:1.0.2'
compile 'com.android.support:design:26.0.1'
testCompile 'junit:junit:4.12'
}

and still having same problem , any help would be appreciated.

score 0 · Answer 1 · answered Aug 24 '17 at 07:15

0

your appcompact and design library version need to same.

just change this

compile 'com.android.support:appcompat-v7:26.+'
compile 'com.android.support.constraint:constraint-layout:1.0.2'
compile 'com.android.support:design:26.+'

answered Aug 24 '17 at 07:15

AskNilesh

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score 0 · Answer 2 · answered Aug 24 '17 at 07:16

0

You should use 26.0.1 .

 compile 'com.android.support:appcompat-v7:26.0.1'
 compile 'com.android.support:design:26.0.1'

Then Clean-Rebuild-Run .

answered Aug 24 '17 at 07:16

IntelliJ Amiya

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this is screen shot of the problem – Mohammad Hassan Aug 24 '17 at 07:27
@MohammadHassan oh..its bug probably. Select API LEVEL 25 or 23 from `preview`section – IntelliJ Amiya Aug 24 '17 at 07:28
I changed the API version to 25 having same problem – Mohammad Hassan Aug 24 '17 at 07:35
@MohammadHassan Same problem for 23 ? – IntelliJ Amiya Aug 24 '17 at 07:36
@MohammadHassan got the point . Read https://stackoverflow.com/questions/35752383/the-following-classes-could-not-be-instantiated-android-support-v7-widget-toolba and https://stackoverflow.com/questions/26575815/the-following-classes-could-not-be-instantiated-android-support-v7-widget-too – IntelliJ Amiya Aug 24 '17 at 07:41
I tryed the solution of the link u gave me before posting the question did not work too. Sorry – Mohammad Hassan Aug 24 '17 at 07:46
I alredy have the latest version of android studio – Mohammad Hassan Aug 24 '17 at 08:13
@MohammadHassan Check android studio version – IntelliJ Amiya Aug 31 '17 at 09:37

score 0 · Answer 3 · edited Aug 24 '17 at 09:19

0

Your appcompact and design library version need to be the same:

compile 'com.android.support:appcompat-v7:26.+'
compile 'com.android.support.constraint:constraint-layout:1.0.2'
compile 'com.android.support:design:26.0.1'

edited Aug 24 '17 at 09:19

Kurt Van den Branden

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answered Aug 24 '17 at 07:18

Praveen Nikhare

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score 0 · Answer 4 · answered Aug 24 '17 at 07:19

0

First change this

`compile 'com.android.support:appcompat-v7:26.+'

to :

compile 'com.android.support:appcompat-v7:26.0.1'

After that invalidate caches and restart , then clean project and rebuild it.

hope this helps.

answered Aug 24 '17 at 07:19

Milad Moosavi

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Anshul.. · Answer 5 · 2017-08-24T07:48:30.553

0

compile 'com.android.support.constraint:constraint-layout:1.0.2'
compile 'com.android.support:appcompat-v7:26.0.0-alpha1'
compile 'com.android.support:design:26.0.0-alpha1'
transitive = true

edited Aug 24 '17 at 07:48

answered Aug 24 '17 at 07:36

Anshul..

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share your exception details – Anshul.. Aug 24 '17 at 07:39
this is screen shot of my details Exception – Mohammad Hassan Aug 24 '17 at 07:43
go to File > Invalidate Cache & Restart – Anshul.. Aug 24 '17 at 08:03
i tryed to remove the library and i just added maven { url "https://maven.google.com" } the problem shows same without any library of what my problem is – Mohammad Hassan Aug 24 '17 at 08:09
While this [code may answer the question](https://meta.stackexchange.com/q/148272), providing additional context regarding *why* and/or *how* this code answers the question improves its long-term value. – Parfait Aug 24 '17 at 18:24

error when adding support design

5 Answers5