按钮1先隐藏，点击按钮2后出现

package com.briup.visible;

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

public class MainActivity extends Activity {
private Button btn1,btn2;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		 btn1 = (Button) findViewById(R.id.btn1);
		 btn2 = (Button) findViewById(R.id.btn2);
		 btn2.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
//			VISIBLE隐藏位置还在	GONE隐藏位置消失
				
				btn1.setVisibility(View.VISIBLE);//隐藏控件
//				btn1.setVisibility(View.GONE);//隐藏控件
			}
		});
	}

}