Android studio error on logcat Attribute "xmlns:card_view" was already specified for element "android.support.v7.widget.CardView"

Question

I'm getting the following error on LogCat when I try to build and run the app. In my app I've used Cardview to display the edittext and textview. When I try to run the app, it shows me the following error:

Attribute "xmlns:card_view" was already specified for element "android.support.v7.widget.CardView".

It's only displaying this information and it's not even showing me the exact location where the problem is.

Here's the XML which contains the CardView:

activity_basic_info:

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">


    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <android.support.v7.widget.Toolbar
            android:layout_width="match_parent"
            android:layout_height="@dimen/_46sdp">


            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent">


                <ImageView
                    android:layout_width="@dimen/_30sdp"
                    android:layout_height="@dimen/_30sdp"
                    android:layout_marginTop="@dimen/_8sdp"
                    android:src="@drawable/ic_arrow_back_black_24dp"/>




                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:textColor="@android:color/white"
                    android:textStyle="bold"
                    android:layout_centerInParent="true"
                    android:textSize="@dimen/_16sdp"
                    android:text="@string/basic_info_header"/>

            </RelativeLayout>



        </android.support.v7.widget.Toolbar>


    </android.support.design.widget.AppBarLayout>

    <android.support.v4.widget.NestedScrollView
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
        android:layout_width="match_parent"
        android:background="@android:color/white"
        android:layout_height="match_parent">



        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@android:color/white"
            android:orientation="vertical">

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:background="@android:color/white"
                android:orientation="horizontal">

                <ImageView
                    android:layout_width="@dimen/_25sdp"
                    android:layout_height="@dimen/_25sdp"
                    android:layout_marginTop="@dimen/_30sdp"
                    android:src="@drawable/contact_info"
                    android:layout_marginStart="@dimen/_40sdp"/>


                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_marginHorizontal="@dimen/_8sdp"
                    android:layout_marginTop="@dimen/_34sdp"
                    android:text="@string/contact_info_text"
                    android:textStyle="bold"
                    android:textColor="@color/textColor"
                    android:textSize="@dimen/_12sdp"/>
            </LinearLayout>




            <android.support.v7.widget.CardView

                android:id="@+id/cardView"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginStart="@dimen/_25sdp"
                android:layout_marginEnd="@dimen/_25sdp"
                android:layout_marginTop="@dimen/_25sdp"
                app:cardCornerRadius="@dimen/_10sdp"
                app:cardElevation="@dimen/_10sdp">

                <LinearLayout

                    android:background="@drawable/bg_layout"
                    android:layout_width="match_parent"
                    android:paddingBottom="@dimen/_2sdp"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center"
                    android:orientation="vertical">



                    <LinearLayout
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content">

                    <TextView
                        android:layout_width="0dp"
                        android:layout_height="wrap_content"
                        android:layout_weight="1"
                        android:paddingBottom="@dimen/_15sdp"
                        android:paddingTop="@dimen/_15sdp"
                        android:paddingEnd="@dimen/_10sdp"
                        android:gravity="end"
                        android:textColor="@android:color/white"
                        android:background="@color/colorPrimary"
                        android:text="Name"/>


                        <EditText
                            android:layout_width="0dp"
                            android:layout_height="wrap_content"
                            android:layout_weight="2"
                            android:paddingTop="@dimen/_15sdp"
                            android:paddingStart="@dimen/_10sdp"
                            android:paddingBottom="@dimen/_15sdp"
                            android:background="@android:color/transparent"
                            android:hint="First and Last name"
                            android:textSize="@dimen/_10sdp"/>

                    </LinearLayout>
                    <View
                        android:layout_width="match_parent"
                        android:layout_height="1dp"
                        android:background="#e2e2e2" />



                    <LinearLayout
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content">

                        <TextView
                            android:layout_width="0dp"
                            android:layout_height="wrap_content"
                            android:layout_weight="1"
                            android:paddingBottom="@dimen/_15sdp"
                            android:paddingTop="@dimen/_15sdp"
                            android:paddingEnd="@dimen/_10sdp"
                            android:gravity="end"
                            android:textColor="@android:color/white"
                            android:background="@color/colorPrimary"
                            android:text="Email"/>


                        <EditText
                            android:layout_width="0dp"
                            android:layout_height="wrap_content"
                            android:layout_weight="2"
                            android:paddingTop="@dimen/_15sdp"
                            android:paddingStart="@dimen/_10sdp"
                            android:paddingBottom="@dimen/_15sdp"
                            android:background="@android:color/transparent"
                            android:hint="Email Address"
                            android:textSize="@dimen/_10sdp"/>

                    </LinearLayout>


                    <View
                        android:layout_width="match_parent"
                        android:layout_height="1dp"
                        android:background="#e2e2e2" />


                    <LinearLayout
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content">

                        <TextView
                            android:layout_width="0dp"
                            android:layout_height="wrap_content"
                            android:layout_weight="1"
                            android:paddingBottom="@dimen/_15sdp"
                            android:paddingTop="@dimen/_15sdp"
                            android:paddingEnd="@dimen/_10sdp"
                            android:gravity="end"
                            android:textColor="@android:color/white"
                            android:background="@color/colorPrimary"
                            android:text="Phone"/>


                        <EditText
                            android:layout_width="0dp"
                            android:layout_height="wrap_content"
                            android:layout_weight="2"
                            android:paddingTop="@dimen/_15sdp"
                            android:paddingStart="@dimen/_10sdp"
                            android:paddingBottom="@dimen/_15sdp"
                            android:background="@android:color/transparent"
                            android:hint="Phone Number"
                            android:textSize="@dimen/_10sdp"/>

                    </LinearLayout>


                </LinearLayout>

            </android.support.v7.widget.CardView>


            <View
                android:layout_width="match_parent"
                android:layout_height="@dimen/_1sdp"
                android:layout_marginTop="@dimen/_20sdp"
                android:layout_marginStart="@dimen/_20sdp"
                android:layout_marginEnd="@dimen/_20sdp"
                android:background="#bababa"/>


        </LinearLayout>


    </android.support.v4.widget.NestedScrollView>


</android.support.design.widget.CoordinatorLayout>

My build.gradle :

apply plugin: 'com.android.application'

android {
    dataBinding
            {
                enabled = true
            }

    compileSdkVersion 28
    defaultConfig {
        applicationId "com.example.newproject"
        minSdkVersion 22
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    //noinspection GradleCompatible
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    implementation 'com.android.support:support-vector-drawable:28.0.0'
    //noinspection GradleDependency
    implementation 'com.android.support:support-v4:28.0.0-alpha1'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
    //rest services
    implementation 'com.squareup.retrofit2:adapter-rxjava2:2.5.0'
    implementation 'com.squareup.retrofit2:converter-gson:2.5.0'
    implementation 'com.squareup.retrofit2:converter-scalars:2.5.0'
    //design
    implementation 'com.android.support:cardview-v7:28.0.0'
    implementation 'com.android.support:recyclerview-v7:28.0.0'
    //image binding
    implementation 'com.squareup.picasso:picasso:2.71828'
    //design libraries
    implementation 'com.android.support:design:28.0.0'
    //reactive programming
    implementation 'io.reactivex.rxjava2:rxandroid:2.0.2'
    implementation 'io.reactivex.rxjava2:rxjava:2.1.12'
    //data binding
    implementation 'android.arch.lifecycle:extensions:1.1.1'
    implementation 'android.arch.lifecycle:livedata:1.1.1'
    annotationProcessor 'android.arch.lifecycle:compiler:1.1.1'
    implementation 'android.arch.lifecycle:viewmodel:1.1.1'
    //sdp library
    implementation 'com.intuit.sdp:sdp-android:1.0.3'
    implementation 'com.android.support:design:28.0.0'
    //circle image Viewer
    implementation 'de.hdodenhof:circleimageview:3.0.0'

}

I have already tried:

• Clean Project

• Rebuild Project

• Invalidate caches and restarted the android studio.

But nothing worked out.

Answer 1

It means tags is already defined in parent which you are using again in child.

Answer 2

I ran into a similar issue. To fix it, I just removed the layout_width and layout_height of the global layout of my xml file.