public class MainActivity extends AppCompatActivity {

    private int money;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        money = 0;
        setText();
    }

    public void onclick(View view) {
        money = +100;
    }

    public void setText() {
        TextView moneyView = (TextView) findViewById(R.id.money_view);
        int mon = money;
        String money = String.format("%08d%", mon);
        moneyView.setText(money);
    }

}