我开始使用支持io.reactivex返回类型的最新androidx.room版本.

dependencies {
    def room_version = "2.1.0-alpha02"
    implementation "androidx.room:room-rxjava2:$room_version"
    kapt "androidx.room:room-compiler:$room_version"
    testImplementation "androidx.room:room-testing:$room_version"
}

简单dao类

@Dao
interface UserDao : BaseDao<UserTable> {

    @Insert(onConflict = OnConflictStrategy.IGNORE)
    fun insertUser(user: UserTable):Maybe<Long>

    @Update
    fun updateUser(user:UserTable):Completable

    @Query("DELETE FROM $USER_TABLE")
    fun clear()
}

生成UserDao_Impl.java并出错

error: local variable user is accessed from within inner class; needs to be declared final

突出显示的字段在此方法中

  @Override
  public Maybe<Long> insertUser(UserTable user) {
    return Maybe.fromCallable(new Callable<Long>() {
     @Override
     public Long call() throws Exception {
       __db.beginTransaction();
        try {
          long _result = 
           __insertionAdapterOfUserTable.insertAndReturnId(user);//error line
           __db.setTransactionSuccessful();
         return _result;
        } finally {
         __db.endTransaction();
        }
      }
    });
  }

确实(UserTable用户)应该在java中声明为final,但它是生成的类.
有没有人碰到过这个？

解决方法:

我有同样的问题.通过添加解决它

compileOptions {
  sourceCompatibility JavaVersion.VERSION_1_8
  targetCompatibility JavaVersion.VERSION_1_8
}

在build.gradle中