房间持久性库:无法解析符号室

时间:2017-09-05 08:16:47

标签: android android-room android-studio-3.0

我使用Android Studio 3.0 Beta 2并使用以下gradle设置

我可以搜索RxRoom,但没有成立Room类。按照Add Components指令后,我不能在片段中使用Room类。

此类位于单独的模块中,app模块不包含任何房间库依赖项。

错误显示"无法解析符号室"在IDE中。

enter image description here

的build.gradle

apply plugin: 'com.android.library'

android {
    compileSdkVersion 26
    buildToolsVersion "26.0.1"


    defaultConfig {
        minSdkVersion 15
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        javaCompileOptions {
            annotationProcessorOptions {
                arguments = ["room.schemaLocation":
                                     "$projectDir/schemas".toString()]
            }
        }
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }

    compileOptions {
        targetCompatibility 1.8
        sourceCompatibility 1.8
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:26.0.2'
    implementation 'com.android.support.constraint:constraint-layout:1.0.2'
    implementation 'com.android.support:design:26.0.2'
    implementation 'com.android.support:support-v4:26.0.2'
    implementation 'com.android.support:recyclerview-v7:26.0.2'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation('com.android.support.test.espresso:espresso-core:3.0.1', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    implementation "android.arch.persistence.room:runtime:1.0.0-alpha9"
    annotationProcessor "android.arch.persistence.room:compiler:1.0.0-alpha9"
    testImplementation "android.arch.persistence.room:testing:1.0.0-alpha9"
    implementation "android.arch.persistence.room:rxjava2:1.0.0-alpha9"
}

更新 我试图将房间库降级为alpha8,而Room类现在又回来了。我不知道为什么这个类在alpha9中消失了,但至少它是解决方法。

3 个答案:

答案 0 :(得分:4)

经过一周的试用,我发现我可以运行apk,即使我有编译时错误。我尝试通过以下方式解决问题以解决编译错误。

更改

annotationProcessor "android.arch.persistence.room:compiler:1.0.0-alpha9"

 implementation "android.arch.persistence.room:compiler:1.0.0-alpha9"

并添加以下Disable the error check from Migrate to Android Plugin for Gradle 3.0

javaCompileOptions {
    annotationProcessorOptions {
        includeCompileClasspath = true
    }
}

答案 1 :(得分:1)

请将所有Room依赖项从implementation更改为build.gradle中的api

答案 2 :(得分:1)

如果在“房间实体”类上收到错误“无法解析符号” ,请尝试使用此技巧:在类中添加一个虚拟属性。然后清理并重建您的项目。这应该刷新实体。然后取出假人。

示例:

@Query("select * from my_entity where name = :name") --> Cannot resolve symbol name...
MyEntity getMyEntityByName(String name);  


@Entity(indices = {@Index(value = {"name"})}, tableName = "my_entity")
public class MyEntity {
    other properties        ....

    public int dummy; --> add and remove this