content: package com.android.launcher3.util;
  
  import android.content.Context;
  import android.database.sqlite.SQLiteDatabase;
  import android.database.sqlite.SQLiteOpenHelper;
  
  import com.android.launcher3.LauncherProvider;
  
  /**
   * An extension of LauncherProvider backed up by in-memory database.
   */
  public class TestLauncherProvider extends LauncherProvider {
  
      @Override
      public boolean onCreate() {
          return true;
      }
  
      @Override
      protected synchronized void createDbIfNotExists() {
          if (mOpenHelper == null) {
              mOpenHelper = new MyDatabaseHelper(getContext());
          }
      }
  
      public SQLiteOpenHelper getHelper() {
          createDbIfNotExists();
          return mOpenHelper;
      }
  
      @Override
      protected void notifyListeners() { }
  
      private static class MyDatabaseHelper extends DatabaseHelper {
          public MyDatabaseHelper(Context context) {
              super(context, null, null);
              initIds();
          }
  
          @Override
          public long getDefaultUserSerial() {
              return 0;
          }
  
          @Override
          protected void onEmptyDbCreated() { }
  
          @Override
          protected void handleOneTimeDataUpgrade(SQLiteDatabase db) { }
      }
  }