O problema é que, quando executo meu código, o aplicativo está parando com um erro (java.lang.RuntimeException: não é possível iniciar a atividade ComponentInfo {com.twixt.pranav.pos / com.twixt.pranav.pos.View.Activity.Cart }: java.lang.NullPointerException: tentativa de chamar o método virtual 'java.io.File android.content.Context.getDatabasePath (java.lang.String)' em uma referência de objeto nulo) no código que você pode ver que eu inseri um dado manualmente

Vi perguntas semelhantes, mas não há soluções para isso

Esta é a minha aula

  class FragmentCart : Fragment() {
    private val database: SQLiteHelper = SQLiteHelper(activity)

     override fun onCreateView(inflater: LayoutInflater?, container: ViewGroup?, savedInstanceState: Bundle?): View {
            val mView = inflater!!.inflate(R.layout.fragment_cart, container, false)
     if (database != null) {
                val array_list = database.cartdatas()
                Toast.makeText(activity, "" , Toast.LENGTH_SHORT).show()
            }
 return mView
    }

Classe auxiliar sqlite

public class SQLiteHelper extends SQLiteOpenHelper {

    private static final int DATABASE_VERSION = 1;
    public static final String DATABASE_NAME = "POS_SQLiteDatabase.db";

    public SQLiteHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL("create table CATEGORIES (ID INTEGER, NAME VARCHAR, COLOR VARCHAR)");
        db.execSQL("create table CART (ITEM_ID INTEGER, ITEM_NAME VARCHAR, QUANTITY FLOAT, PRICE FLOAT, ONLINE INTEGER, DATE_ VARCHAR, FLAG INTEGER)");

        db.execSQL("insert into CART values(321,'test name',1.1,50,1,'test date',0)");
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL("DROP TABLE IF EXISTS CATEGORIES");
        db.execSQL("DROP TABLE IF EXISTS CART");
        onCreate(db);
    }

    public  Boolean  insetCartData(int item_id,String item_name,float quantity,float price,int online,String date, String flag){
        SQLiteDatabase database = this.getWritableDatabase();
        ContentValues contentValues = new ContentValues();

        contentValues.put("ITEM_ID",item_id);
        contentValues.put("ITEM_NAME",item_name);
        contentValues.put("QUANTITY",quantity);
        contentValues.put("PRICE",price);
        contentValues.put("ONLINE",online);
        contentValues.put("DATE_",date);
        contentValues.put("FLAG",flag);

        database.insert("CART",null,contentValues);

        return true;
    }

    public ArrayList<String> cartdatas(){
       /* SQLiteDatabase database=this.getReadableDatabase();
        Cursor cursor=database.rawQuery("SELECT * FROM CART where ITEM_ID="+id+"",null);
        return cursor;*/
        ArrayList<String> array_list = new ArrayList<String>();

        SQLiteDatabase db = this.getReadableDatabase();
        Cursor res =  db.rawQuery( "select * from CART", null );
        res.moveToFirst();

        while(res.isAfterLast() == false){
            array_list.add(res.getString(res.getColumnIndex("ITEM_NAME")));
            res.moveToNext();
        }
        return array_list;
    }


}

E erro

E/AndroidRuntime: FATAL EXCEPTION: main
                  Process: com.twixt.pranav.pos, PID: 4602
                  java.lang.RuntimeException: Unable to start activity ComponentInfo{com.twixt.pranav.pos/com.twixt.pranav.pos.View.Activity.Cart}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.io.File android.content.Context.getDatabasePath(java.lang.String)' on a null object reference
                      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2778)
                      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856)
                      at android.app.ActivityThread.-wrap11(Unknown Source:0)
                      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589)
                      at android.os.Handler.dispatchMessage(Handler.java:106)
                      at android.os.Looper.loop(Looper.java:164)
                      at android.app.ActivityThread.main(ActivityThread.java:6494)
                      at java.lang.reflect.Method.invoke(Native Method)
                      at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
                   Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.io.File android.content.Context.getDatabasePath(java.lang.String)' on a null object reference
                      at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:292)
                      at android.database.sqlite.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:262)
                      at com.twixt.pranav.pos.Controller.SQLiteHelper.cartdatas(SQLiteHelper.java:62)
                      at com.twixt.pranav.pos.View.Fragment.FragmentCart.onCreateView(FragmentCart.kt:38)
                      at android.app.Fragment.performCreateView(Fragment.java:2508)
                      at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1279)
                      at android.app.FragmentManagerImpl.addAddedFragments(FragmentManager.java:2407)
                      at android.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2186)
                      at android.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2142)
                      at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2043)
                      at android.app.FragmentManagerImpl.dispatchMoveToState(FragmentManager.java:3032)
                      at android.app.FragmentManagerImpl.dispatchActivityCreated(FragmentManager.java:2979)
                      at android.app.FragmentController.dispatchActivityCreated(FragmentController.java:178)
                      at android.app.Activity.performCreate(Activity.java:7006)
                      at android.app.Activity.performCreate(Activity.java:6991)
                      at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1214)
                      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2731)
                      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856) 
                      at android.app.ActivityThread.-wrap11(Unknown Source:0) 
                      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589) 
                      at android.os.Handler.dispatchMessage(Handler.java:106) 
                      at android.os.Looper.loop(Looper.java:164) 
                      at android.app.ActivityThread.main(ActivityThread.java:6494) 
                      at java.lang.reflect.Method.invoke(Native Method) 
                      at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438) 
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807) 
Application terminated.