Option Menu selection event : Menu « UI « Android

1. Android
2. UI
3. Menu

Option Menu selection event

  
/***
  Copyright (c) 2008-2009 CommonsWare, LLC
  
  Licensed under the Apache License, Version 2.0 (the "License"); you may
  not use this file except in compliance with the License. You may obtain
  a copy of the License at
    http://www.apache.org/licenses/LICENSE-2.0
  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
*/

package com.commonsware.android.inflation;

import android.app.Activity;
import android.os.Bundle;
import android.app.ListActivity;
import android.view.ContextMenu;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;
import java.util.HashMap;
import java.util.Map;

public class InflationDemo extends Activity {
  private final static Map<Integer,String> MESSAGES;
  private boolean otherStuffVisible=false;
  private Menu theMenu=null;
  
  static {
    MESSAGES=new HashMap<Integer,String>();
    MESSAGES.put(R.id.close, "I don't wanna!");
    MESSAGES.put(R.id.no_icon, "Where's my picture?");
    MESSAGES.put(R.id.later, "Quoth the Maven, \"#4\"");
    MESSAGES.put(R.id.last, "i always get picked last...");
    MESSAGES.put(R.id.non_ghost, "I ain't 'fraid of no ghost!");
    MESSAGES.put(R.id.ghost, "Boo!");
  };
  
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
  }
  
  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    theMenu=menu;
    
    new MenuInflater(getApplication())
                                  .inflate(R.menu.sample, menu);

    return(super.onCreateOptionsMenu(menu));
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    if (item.getItemId()==R.id.non_ghost) {
      otherStuffVisible=!otherStuffVisible;
      
      theMenu.setGroupVisible(R.id.other_stuff, otherStuffVisible);
    }
    
    String message=MESSAGES.get(item.getItemId());
    
    if (message!=null) {
      Toast.makeText(this, message, Toast.LENGTH_SHORT).show();
      
      return(true);
    }
    
    return(super.onOptionsItemSelected(item));
  }
}

//res\layout\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"
    >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="Click on the option menu and play with the choices!"
    />
</LinearLayout>



//res\menu\sample.xml
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
  <item android:id="@+id/close"
    android:title="Close"
    android:orderInCategory="3"
    android:icon="@drawable/eject" />
  <item android:id="@+id/no_icon"
    android:orderInCategory="2"
    android:title="Sans Icon" />
  <item android:id="@+id/disabled"
    android:orderInCategory="4"
    android:enabled="false"
    android:title="Disabled" />
  <group android:id="@+id/other_stuff"
    android:menuCategory="secondary"
    android:visible="false">
    <item android:id="@+id/later"
      android:orderInCategory="0"
      android:title="2nd-To-Last" />
    <item android:id="@+id/last"
      android:orderInCategory="1"
      android:title="Last" />
  </group>
  <item android:id="@+id/submenu"
    android:orderInCategory="3"
    android:title="A Submenu">
    <menu>        
      <item android:id="@+id/non_ghost"
        android:title="Non-Ghost"
        android:visible="true"
        android:alphabeticShortcut="n" />
      <item android:id="@+id/ghost"
        android:title="A Ghost"
        android:visible="false"
        android:alphabeticShortcut="g" />
    </menu>
  </item>
</menu>

   
    
  

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