用setVisibility,設定可見傳引數View.VISIBLIE,不可見傳View.INVISIBLE

package com.example.androidtest;

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

public class MainActivity extends Activity  {
	
	OnClickListener listen1 = null;
	OnClickListener listen2 = null;
	Button btn1, btn2;
	
	public void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		btn1 = (Button)findViewById(R.id.button1);
		btn2 = (Button)findViewById(R.id.button2);
		
		listen1 = new OnClickListener() {
			public void onClick(View v) {
				setTitle("Button1");
				btn1.setVisibility(View.INVISIBLE);
				btn2.setVisibility(View.VISIBLE);
			}
		};
		
		listen2 = new OnClickListener() {
			public void onClick(View v) {
				setTitle("Button2");
				btn1.setVisibility(View.VISIBLE);
				btn2.setVisibility(View.INVISIBLE);
			}
		};
		
		btn1.setOnClickListener(listen1);
		btn2.setOnClickListener(listen2);
	}	
}
 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
   xmlns:android="http://schemas.android.com/apk/res/android"
   android:orientation="vertical"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"> 
  <EditText android:id="@+id/speed" android:maxLines="1"
    android:layout_marginTop="2dip" android:layout_width="wrap_content"
    android:ems="25" android:layout_height="wrap_content"
    android:autoText="true" android:scrollHorizontally="true" />

  <Button android:id="@+id/button1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" android:text="button1" />
  <Button android:id="@+id/button2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" android:text=" button2" />
</LinearLayout>