public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Intent intent = getIntent();
        id1 = Integer.valueOf(intent.getStringExtra("number"));
        Log.i("id1bnrgbngbnb", id1.toString());
        Drawable d = getResources().getDrawable(R.drawable.images);
        height = d.getIntrinsicHeight();
        width = d.getIntrinsicWidth();
        DisplayMetrics displayMetrics = new DisplayMetrics();
        this.getWindowManager()
                .getDefaultDisplay()
                .getMetrics(displayMetrics);
        heightofactivity = displayMetrics.heightPixels;
        gridview = (GridView) findViewById(R.id.gridview1);
        gridview.setNumColumns(id1);
        gridview.setColumnWidth(widthofactivity / id1);
        gridview.setAdapter(new ImageAdapter(this));

        gridview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View v,
                                    int position, long id) {
                Toast.makeText(getApplicationContext(), "" + position,
                        Toast.LENGTH_SHORT).show();
            }
        });


    }


    protected void onStart() {
        super.onStart();
        numbers = new ArrayList<>();
        int x = numberofboxestoselect(id1);
        for (int i = 0; i < x; i++) {
            numbers.add(selectrandomnumers(id1));
        }
        for (int i = 0; i < numbers.size(); i++) {
            Log.i("numbers", numbers.toString());

            View v = gridview.getChildAt(numbers.get(i));

            v.setBackgroundResource(R.drawable.download);
        }

    }

    private int numberofboxestoselect(Integer id1) {
        int Min = 0;
        int Max = id1 * id1 - 1;
        return Min + (int) (Math.random() * ((Max - Min) + 1));
    }