CODEWITHSUNDEEP
androidandroid-room
user7500403
user7500403

Reputation:

Error in writing Annotations using Room Persistence library - Android

I am using Room Persistence Library to create a database in my android application.

When trying to make a class named User as an Entity, I added @Entity annotation above my User class but android studio displays an error saying cannot resolve symbol Entity.

@Entity               <--------cannot resolve symbol Entity
public class User {

    @PrimaryKey                     <--------cannot resolve symbol PrimaryKey
    private String userName;
    private String userPhoneNumber;
}

I also tried to add @PrimaryKey annotation to one of the data members of User class but i get the same error.

What am i doing wrong here ?

Logs from Gradle Console

Executing tasks: [:app:generateDebugSources, :app:generateDebugAndroidTestSources, :app:mockableAndroidJar]

Configuration on demand is an incubating feature.
:app:preBuild UP-TO-DATE
:app:preDebugBuild
:app:compileDebugAidl
:app:compileDebugRenderscript
:app:checkDebugManifest
:app:generateDebugBuildConfig
:app:prepareLintJar
:app:generateDebugResValues
:app:generateDebugResources
:app:mergeDebugResources
:app:createDebugCompatibleScreenManifests
:app:processDebugManifest
:app:splitsDiscoveryTaskDebug
:app:processDebugResources
:app:generateDebugSources
:app:preDebugAndroidTestBuild
:app:compileDebugAndroidTestAidl
:app:processDebugAndroidTestManifest
:app:compileDebugAndroidTestRenderscript
:app:generateDebugAndroidTestBuildConfig
:app:generateDebugAndroidTestResValues
:app:generateDebugAndroidTestResources
:app:mergeDebugAndroidTestResources
:app:splitsDiscoveryTaskDebugAndroidTest
:app:processDebugAndroidTestResources
:app:generateDebugAndroidTestSources
:app:mockableAndroidJar

BUILD SUCCESSFUL in 2m 38s
22 actionable tasks: 22 executed

Gradle build

apply plugin: 'com.android.application'

android {
    compileSdkVersion 26
    defaultConfig {
        applicationId "com.example.Nick.phonebook_database"
        minSdkVersion 15
        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 {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:26.1.0'
    implementation 'com.android.support.constraint:constraint-layout:1.0.2'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.1'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
}

Upvotes: 0

Views: 1423

Answers (1)

Enzokie
Enzokie

Reputation: 7415

You need to import the Room dependency also.

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:26.1.0'
    implementation 'com.android.support.constraint:constraint-layout:1.0.2'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.1'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'

    implementation 'android.arch.persistence.room:runtime:1.0.0-beta1'
    annotationProcessor "android.arch.persistence.room:compiler:1.0.0-beta1"

}

After adding the dependency click Sync Now.

Upvotes: 1

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