Calendar textView

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
import java.util.Calendar;
import java.util.Timer;
import java.util.TimerTask;
 
 
public class MainActivity extends Activity {
    private TextView Vivod;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Timer timer1;
        timer1 = new Timer();
        timer1.schedule(new TimerTask() {
            @Override
            public void run() {
                timerTick();
            }
        }, 1000);
     }
    private void timerTick() {
        this.runOnUiThread(Task1);
    }
private Runnable Task1 = new Runnable() {
    @Override
    public void run() {
        Calendar c = Calendar.getInstance();
        int now = c.get(Calendar.WEEK_OF_YEAR);
        now=now++;
        Vivod.setText(now);
        Vivod = (TextView) findViewById(R.id.Nadpis);
    }
};
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
 
        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }
 
        return super.onOptionsItemSelected(item);
    }
}

private void timerTick() {
this.runOnUiThread(Task1);
}

private Runnable Task1 = new Runnable() {
        @Override
        public void run() {
            Calendar c = Calendar.getInstance();
            int now = c.get(Calendar.WEEK_OF_YEAR);
            int a = now*2;
            Vivod = (TextView) findViewById(R.id.Nadpis);
            Vivod.setText(Integer.toString(a));
        }
};