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package app.test;

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

public class Test extends Activity {
  OnClickListener listener1 = null;
  OnClickListener listener2 = null;
  Button button1;
  Button button2;
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    listener1 = new OnClickListener() {
      public void onClick(View v) {
        setTitle("button1");
        button1.setVisibility(View.INVISIBLE);
        button2.setVisibility(View.VISIBLE);
      }
    };
    listener2 = new OnClickListener() {
      public void onClick(View v) {
        setTitle("button2");
        button2.setVisibility(View.INVISIBLE);
        button1.setVisibility(View.VISIBLE);
      }
    };
    setContentView(R.layout.main);
    button1 = (Button) findViewById(R.id.button1);
    button1.setOnClickListener(listener1);
    button2 = (Button) findViewById(R.id.button2);
    button2.setOnClickListener(listener2);
  }
}


//main.xml

<?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>

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Show or hide button : Button « UI « Android

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