调用Rooms inMemoryBuilder方法时,Room Persistence Library运行时异常

Question

按照设置Room余辉库的教程时,我在Android设备上测试时遇到此错误.

java.lang.RuntimeException:找不到PackageName .AppDatabase的实现.AppDatabase_Impl不存在

我知道有一个类似的问题,但问题是由于kotlin gradle问题.可能重复

测试类:

@RunWith(AndroidJUnit4.class)
public class LocalDatabaseTest {

    private PhotoDao mPhotoDao;
    private AppDatabase mDb;

    @Before
    public void createDb() {
        Context context = InstrumentationRegistry.getTargetContext();
        mDb = Room.inMemoryDatabaseBuilder(context.getApplicationContext(), AppDatabase.class).build();
        mPhotoDao = mDb.photoDao();
    }

    @After
    public void closeDb() throws IOException {
    //mDb.close();
}

    @Test
    public void testPreConditions() {
        assertNotNull(mDb);
   }

道:

    @Dao
    public interface PhotoDao {
    @Delete()
    public void delete(Photo... photos);

    @Update
    public void update(Photo ... photos);

    @Insert
    public void insert(Photo ... photos);
    }

数据库:

@Database(entities = {Photo.class}, version = 1)
public abstract class AppDatabase extends RoomDatabase {
public abstract PhotoDao photoDao();
}

堆栈跟踪:

java.lang.RuntimeException: cannot find implementation for *PackageName*.AppDatabase. AppDatabase_Impl does not exist
at android.arch.persistence.room.Room.getGeneratedImplementation(Room.java:90)
at android.arch.persistence.room.RoomDatabase$Builder.build(RoomDatabase.java:340)
at pics.chooz.choozpics.LocalDatabaseTest.createDb(LocalDatabaseTest.java:40)
at android.support.test.internal.runner.TestExecutor.execute(TestExecutor.java:59)
at android.support.test.runner.AndroidJUnitRunner.onStart(AndroidJUnitRunner.java:262)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1853)

摇篮:

apply plugin: "com.android.application"
apply plugin: "android-apt"

android {
    compileSdkVersion 25
    buildToolsVersion "25.0.2"

    defaultConfig {
        applicationId "*Package Name*"
        minSdkVersion 16
        targetSdkVersion 25
        versionCode 50
        versionName "1.0.32"
        multiDexEnabled true
        testInstrumentationRunner     "android.support.test.runner.AndroidJUnitRunner"
}

dexOptions {
    javaMaxHeapSize "4g"
}

buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile("proguard-android.txt"), "proguard-rules.pro"
    }
    debug {
        debuggable true
    }
}

lintOptions {
    abortOnError false
    disable "ResourceType"
}

sourceCompatibility = 1.7
targetCompatibility = 1.7
compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_7
    targetCompatibility JavaVersion.VERSION_1_7
}

packagingOptions {
    exclude 'META-INF/ASL2.0'
    exclude 'META-INF/LICENSE'
    exclude 'META-INF/NOTICE'
}
}
dependencies {

androidTestCompile "com.android.support:support-annotations:$androidVersion"
androidTestCompile 'com.android.support.test:runner:0.5'
androidTestCompile 'com.android.support.test:rules:0.5'

    compile "android.arch.persistence.room:runtime:1.0.0-alpha1"
    annotationProcessor "android.arch.persistence.room:compiler:1.0.0-alpha1"
}

Answer 1

我在gradle文件中将'annotationProcessor'关键字更改为'kapt'.像这样:

kapt "android.arch.persistence.room:compiler:1.0.0"

Answer 2

使用Kotlin时的经验法则:

annotationProcessor用kapt.替换你的依赖项.此外,还包括 apply plugin: 'kotlin-kapt'在您的应用中build.gradle.

Answer 3

看看这个帖子

解决方案是替换:

annotationProcessor "android.arch.persistence.room:compiler:VERSION"

用:

kapt "android.arch.persistence.room:compiler:VERSION"