Button控件

package com.android;

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

public class ButtonActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Button btn = (Button ) findViewById(R.id.go);
        
        btn.setOnClickListener(new OnClickListener(){
        	public void onClick(View v){
        		TextView edt = (TextView) findViewById(R.id.text);
        		edt.setText("3424343");
        	   
        	}
        });
        
    }
}