AndroidxjectPackRoom集成报错

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Schema export directory is not provided to the annotation processor so we cannot export the schema.

You can either provide room.schemaLocation annotation processor argument OR set exportSchema to false.

根据提示我们有两种解决方案：

• 1、给RoomDatabase设置exportSchema注解为false。

  @Database(entities = { YourEntity.class }, version = 1, exportSchema = false)
  

-2 、在项目中gradle中通过 annotationProcessorOptions 注解，为room.schemaLocation指定schemas的子文件夹。

  android {
      compileSdkVersion 28
      defaultConfig {
          applicationId "com.ocrapp"
          minSdkVersion 16
          targetSdkVersion 28
          versionCode 1
          versionName "1.0"
          testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
          //指定room.schemaLocation生成的文件路径
          javaCompileOptions {
              annotationProcessorOptions {
                  arguments = ["room.schemaLocation": "$projectDir/schemas".toString()]
              }
          }
      }
      buildTypes {
          release {
              minifyEnabled false
              proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
          }
      }

  }