package com.fish.helloworld;import android.app.Activity;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.os.Bundle;import android.util.Log;import android.view.KeyEvent;import android.view.Menu;import android.view.MenuItem;import android.view.MotionEvent;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.ImageView;import android.widget.TextView;public class MainActivity extends Activity {    private Button m_Button;        public static final int RED_MENU_ID = Menu.FIRST;    public static final int GREEN_MENU_ID = Menu.FIRST + 1;    public static final int BLUE_MENU_ID = Menu.FIRST + 2;        @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.skeleton_activity);                m_Button = (Button)findViewById(R.id.button1);    }        @Override    public boolean onCreateOptionsMenu(Menu menu){        super.onCreateOptionsMenu(menu);        menu.add(0, RED_MENU_ID, 0, "RED");        menu.add(0, GREEN_MENU_ID, 0, "GREEN");        menu.add(0, BLUE_MENU_ID, 0, "BLUE");        return true;    }    @Override    public boolean onOptionsItemSelected(MenuItem item){        switch(item.getItemId()){        case RED_MENU_ID:            m_Button.setBackgroundColor(Color.RED);            m_Button.setText("RED");            return true;        case GREEN_MENU_ID:            m_Button.setBackgroundColor(Color.GREEN);            m_Button.setText("GREEN");            return true;        case BLUE_MENU_ID:            m_Button.setBackgroundColor(Color.BLUE);            m_Button.setText("BLUE");            return true;        }                return super.onOptionsItemSelected(item);    }}

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <Button        android:id="@+id/button1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Button" /></LinearLayout>