Sudden compile error in Android Studio; error: cannot find symbol class ComputableLiveData

Question

I opened up my project and compiled and ran it, and I'm getting the error mentioned in the title, error: cannot find symbol class ComputableLiveData . I've built a local database using a Room abstraction over SQLite, and the error is occurring in BundleDao_Impl.java .

package com.weaberlumber.programmer.s4s_scan;

import android.arch.lifecycle.ComputableLiveData; //The error is here
import android.arch.lifecycle.LiveData;
import android.arch.persistence.db.SupportSQLiteStatement;
import android.arch.persistence.room.EntityDeletionOrUpdateAdapter;
import android.arch.persistence.room.EntityInsertionAdapter;
import android.arch.persistence.room.InvalidationTracker.Observer;
import android.arch.persistence.room.RoomDatabase;
import android.arch.persistence.room.RoomSQLiteQuery;
import android.arch.persistence.room.util.StringUtil;

I've tried deleting the build folder so that the file could be regenerated, but no luck.

Answer 1

通过将以下实现添加到build.gradle （Module：app）下的依赖项来解决此问题。

    implementation 'android.arch.lifecycle:livedata:1.1.1'