android程序开发，自定义变量a，a=1时textview显示1，a=0时 点击刷新button textview显示0，怎样实现？

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class BaiduActivity extends Activity {
/** Called when the activity is first created. */
private TextView textView;
private Button b;
private int i ;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

textView = (TextView) findViewById(R.id.t);
b = (Button) findViewById(R.id.b);
i = 0 ;

b.setOnClickListener(new OnClickListener() {

public void onClick(View v) {
// TODO Auto-generated method stub
textView.setText(i+"");
i=1;

}
});

}
}

点击button时重新设置以下textview的文本。