1

I want to add an Action Bar to my app. And there is a problem appearing

error: package android.support.v7.widget does not exist.

I cannot fix that problem whatever i tried. Any solution on internet does not work on me.I do not know why this is happening and i am really tired of it. I am the beginner and this problem drives me crazy.I've tried to change

android.useAndroidX=true --> to false

and

android.enableJetifier=true --> false on gradle.properties

Yeah, its work!But here is another problem appearing:

java.lang.RuntimeException: Manifest merger failed : Attribute application@appComponentFactory value=(android.support.v4.app.CoreComponentFactory) from [com.android.support:support-compat:28.0.0] AndroidManifest.xml:22:18-91

Here is my build.gradle: 

 compileSdkVersion 29 buildToolsVersion '29.0.1' minSdkVersion 21 targetSdkVersion 29 dependencies { implementation fileTree(dir: 'libs', include: ['*.jar']) implementation 'androidx.appcompat:appcompat:1.1.0-rc01' implementation 'androidx.constraintlayout:constraintlayout:2.0.0-beta2' implementation 'com.google.android.material:material:1.1.0-alpha07' testİmplementation 'junit:junit:4.13-beta-3' androidTestİmplementation 'androidx.test:runner:1.3.0-alpha01' androidTestİmplementation 'androidx.test.espresso:espresso-core:3.3.0-alpha01' implementation 'com.android.support:appcompat-v7:28.0.0' implementation 'com.android.support:support-v4:28.0.0' implementation 'com.android.support:support-v13:28.0.0' }

Could be problem on implementation methods, i do not know. May be i have a problem on SDK versions. I have tried migrate to AndroidX and not worked.

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5

3 Answers 3

Reset to default
3

Try replacing 

android.support.v7.widget

with 

androidx.appcompat.widget
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Comments

2

Welcome to stackoverflow!

You have both support library and androidx library in one project...that's your issue...

Change the support libraries to the preferred AndroidX library...

dependencies { implementation fileTree(dir: 'libs', include: ['*.jar']) implementation 'androidx.appcompat:appcompat:1.1.0-rc01' implementation 'androidx.constraintlayout:constraintlayout:2.0.0-beta2' implementation 'com.google.android.material:material:1.1.0-alpha07' testİmplementation 'junit:junit:4.13-beta-3' androidTestİmplementation 'androidx.test:runner:1.3.0-alpha01' androidTestİmplementation 'androidx.test.espresso:espresso-core:3.3.0-alpha01' implementation 'androidx.legacy:legacy-support-v4:1.0.0' implementation 'androidx.legacy:legacy-support-v13:1.0.0' }

Or you can probably Migrate to AndroidX and it can be done right in Android Studio

Simply go to Refactor > Migrate to AndroidX > Migrate

Adding an Action Bar

<androidx.appcompat.widget.Toolbar android:id="@+id/toolbar" android:layout_width="match_parent" android:layout_height="?attr/actionBarSize" android:background="@color/yourColor"/>

I hope this helps....

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5 Comments

Yeahi thanks for help. But if i ask, why we cannot use both support libraries and AndroidX. Because i watch a tuttorial and they can import android.support.v7.widget.Toolbar
Then i suggest you use the support library instead of androidx
'android.support.v7.widget.Toolbar' and 'androidx.appcompat.widget.Toolbar' do the same thing...the tutorial you're been taught on is just a bit old...but are you still having any issue?
Dave i am really pleasured for your help, really thanks! The last question is, how can i use only v7.widget? I just wonder it.
Well there's a way you could use android.support.v7.widget.Toolbar in your project..but you could have issues later in the future. Replace com.google.android.material:material:1.1.0-alpha07 with com.android.support:design:28.0.0 then go to your AndroidManifest.xml and add tools:replace="android:appComponentFactory" android:appComponentFactory="whateverString" just below your application tag...it should work
2

Please try this:

implementation fileTree(dir: 'libs', include: ['*.jar']) implementation 'androidx.appcompat:appcompat:1.0.2' implementation 'androidx.constraintlayout:constraintlayout:1.1.3' implementation 'com.google.android.material:material:1.0.0' implementation 'androidx.vectordrawable:vectordrawable:1.0.0' testImplementation 'junit:junit:4.12' androidTestImplementation 'androidx.test:runner:1.1.0' androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.0'
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1 Comment

Thank you for answer. I've tried but the problem still persist.

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