Other icons are not displayed on a real device (what is the reason for this?

Question

Android

Other icons are not displayed on the real device (what is the reason for this?. They are visible on the layout.

GridLayout mainGrid;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main3);
        mainGrid = (GridLayout) findViewById(R.id.mainGrid);

        //Задать Событие
        setSingleEvent(mainGrid);
        //setToggleEvent(mainGrid);
    }

    private void setToggleEvent(GridLayout mainGrid) {
        //Зациклить все дочерние элементы главной сетки
        for (int i = 0; i < mainGrid.getChildCount(); i++) {
            //You can see , all child item is CardView , so we just cast object to CardView
            final CardView cardView = (CardView) mainGrid.getChildAt(i);
            cardView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    if (cardView.getCardBackgroundColor().getDefaultColor() == -1) {
                        //Change background color
                        cardView.setCardBackgroundColor(Color.parseColor("#FF6F00"));
                        Toast.makeText(Main3Activity.this, "State : True", Toast.LENGTH_SHORT).show();

                    } else {
                        //Change background color
                        cardView.setCardBackgroundColor(Color.parseColor("#FFFFFF"));
                        Toast.makeText(Main3Activity.this, "State : False", Toast.LENGTH_SHORT).show();
                    }
                }
            });
        }
    }

    private void setSingleEvent(GridLayout mainGrid) {
       // Зациклить все дочерние элементы главной сетки
        for (int i = 0; i < mainGrid.getChildCount(); i++) {
            //You can see , all child item is CardView , so we just cast object to CardView
            CardView cardView = (CardView) mainGrid.getChildAt(i);
            final int finalI = i;
            cardView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {

                    Intent intent = new Intent(Main3Activity.this,ActivityOne.class);
                    intent.putExtra("info","This is activity from card item index  "+finalI);
                    startActivity(intent);

                }
            });
        }
    }
}