我想在listview上显示for循环编号，但它不起作用。应用程序布局

public class MainActivity extends AppCompatActivity {

    private ListView marksixlist;
    private Button mRandombtn, mCleanbtn;
    private TextView mText;
    private ArrayList<Integer> marksixnum = new ArrayList<Integer>();
    private ArrayAdapter arrayAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        marksixlist = (ListView) findViewById(R.id.listview1);

        mRandombtn = (Button) findViewById(R.id.randombtn);
        mCleanbtn = (Button) findViewById(R.id.cleanbtn);
        mText = (TextView) findViewById(R.id.items);

        mRandombtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                for (int j = 1; j <= 6; j++) {
                    int random = (int) (Math.random()* 49+1);
                        marksixnum.add(random);
                        Collections.shuffle(marksixnum);
                }
            }
        });

        arrayAdapter = new ArrayAdapter<Integer>(this, R.layout.listitempage, marksixnum);
        marksixlist.setAdapter(arrayAdapter);
        Log.d("aaa", "The markssix is - " + marksixnum);
    }
}