title: Remove room database on app uninstall
body: <p>I am making an app and I am using Android Room Persistence Library to handle my database layer. Room Library works like charm and everything is fine with it. But I want the database that room creates to be removed when the user uninstall the app. I tried uninstalling the app and then installed again, but somehow the database was still there and app was able to get the old data from it. </p>
  
  <p>I thought maybe because my app data backup is set to auto in the settings and android is backing it up on cloud and bringing it back again but turning off backup from settings didn't help. Even if that worked that doesn't sound like a good solution to me. </p>
  
  <p>I have created a very simple class that extends <code>RoomDatabase</code> and below is the code if that helps answering the question. </p>
  
  <p>I know that I can use <code>fallbackToDestructiveMigration()</code> on the database builder and increase the database version. It will clear the data from the database. That is not what I want. </p>
  
  <pre><code>@Database(entities = {UnleashedEntity.class}, version = 1)
  public abstract class AppDatabase extends RoomDatabase {
  
      private static AppDatabase INSTANCE;
  
      public abstract DaoContract MyDao();
  
      public static AppDatabase getAppDatabase(Context context) {
          if (INSTANCE == null) {
              INSTANCE =
                      Room.databaseBuilder(context.getApplicationContext(), AppDatabase.class, "user-database")
                              .build();
          }
          return INSTANCE;
      }
  
      public static void destroyInstance() {
          INSTANCE = null;
      }
  }
  </code></pre>
  
  <p><strong>Edit</strong>
  I know I can use <code>ACTION_PACKAGE_REMOVED</code> intent to make my app aware of the uninstall. What I wanted to know, Is there a configuration of the <code>databasebuilder</code> that does the job, and How come the database persists after app uninstall.</p>