مشکلم با btn

سلام اگه میشه لطفا راهنمایی کنید مشکل این چیه(حل شد)

 package mohammadi.yasin.app;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;


public class MyStarup4Activity extends Activity {

    public int Counter = 0;


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        final TextView txtCaption = (TextView) findViewById(R.id.txtCaption);
        final Button btnChangeVisibility = (Button) findViewById(R.id.btnChangeVisibility);

        for (int i = 0; i < 2; i++) {
            Toast.makeText(MyStarup4Activity.this, "Some Massege " + i, Toast.LENGTH_SHORT).show();
            txtCaption.setText("I is: " + i);
        }

        txtCaption.setTextColor(Color.parseColor("#00ff00"));
        txtCaption.setBackgroundColor(Color.parseColor("#7f7f7f"));
        txtCaption.setTextSize(40);
        //txtCaption.setVisibility(View.GONE);
        txtCaption.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {
                Log.i("LOG", "View Text Clicked");
                Toast.makeText(MyStarup4Activity.this, "Text View Clicked", Toast.LENGTH_SHORT).show();
                Counter++;
                txtCaption.setText("Counter is: " + Counter);
            }
        });
        
        btnChangeVisibility.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {
                Log.i("LOG", "View Text Clicked");
                Toast.makeText(MyStarup4Activity.this, "Text View Clicked", Toast.LENGTH_SHORT).show();
                Counter++;
                txtCaption.setText("Counter is: " + Counter);
            }
        });
    }
}