public class DialogWelcome extends DialogFragment {
    private TextView txtTitleDialog;
    private TextView txtMsg;
    private TextView txtOk;
    private View.OnClickListener onClickListener;

    public void setOnClickListener(View.OnClickListener onClickListener) {
        this.onClickListener = onClickListener;
    }

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view=inflater.inflate(R.layout.dialog_welcome, container, false);
        txtOk=view.findViewById(R.id.txtOk);
        txtMsg=view.findViewById(R.id.txtMsg);
        txtTitleDialog=view.findViewById(R.id.txtTitleDialog);
        return inflater.inflate(R.layout.dialog_welcome, container, false);
    }

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setCancelable(false);
    }

    @Override
    public void onResume() {
        super.onResume();
        Window window = getDialog().getWindow();
        window.setLayout(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
        window.setGravity(Gravity.CENTER);
    }

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        txtOk.setOnClickListener(v -> {
            dismiss();
            onClickListener.onClick(v);
        });
    }

}




<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:padding="20dp"
    android:layout_height="match_parent">

    <TextView
        android:id="@+id/txtTitleDialog"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="8dp"
        android:text="Welcome!"
        android:textSize="18sp"
        android:textColor="@android:color/black"
        android:fontFamily="@font/roboto_medium"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"/>

    <TextView
        android:textSize="18sp"
        android:textColor="@color/color_text_description"
        android:fontFamily="@font/roboto"
        android:id="@+id/txtMsg"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:text="Our community is dedicated to life,\nliving, happiness, wellbeing &amp;\nbalance. Founded on Love,\nCompassion and Honesty.\n\n\nSentient Life"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/txtTitleDialog"/>

    <TextView
        android:textSize="18sp"
        android:textColor="@color/color_text"
        android:fontFamily="@font/roboto_medium"
        android:id="@+id/txtOk"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="70dp"
        android:text="OK"
        android:gravity="end"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/txtMsg"/>
</androidx.constraintlayout.widget.ConstraintLayout>






 DialogWelcome welcome=new DialogWelcome();
            welcome.setOnClickListener(v -> {
                BaseApp.getPrefS().setFirstRun(true);
                finishActivity();
            });
            welcome.show(getSupportFragmentManager(), "DialogWelcome");