Overwrite MENU key to create custom menu for Andorid

When user click on the hardware MENU key, Android OS will pop-up option menu; refer to the post "Create OptionsMenu in /res/menu/menu.xml" to know how to implement a formal OptionMenu. Alternatively, we can overwrite the default menu to create our custom menu as shown below:

Create /res/layout/menu.xml to make the layout of our manu. You can replace the android:src items for your own icon.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 android:orientation="horizontal">
<ImageButton
 android:id="@+id/opt1"
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 android:layout_weight="1"
 android:src="@drawable/icon"/>
<ImageButton
 android:id="@+id/opt2"
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 android:layout_weight="1"
 android:src="@drawable/icon"/>
<ImageButton
 android:id="@+id/opt3"
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 android:layout_weight="1"
 android:src="@drawable/icon"/>
</LinearLayout>

package com.CustomMenu;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.widget.ImageView;
import android.widget.Toast;

public class CustomMenuActivity extends Activity {
 
   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
   }
  
   @Override
   public boolean onKeyUp(int keyCode, KeyEvent event) {
    if(keyCode == KeyEvent.KEYCODE_MENU) {
     if(menuDialog == null) {
      menuDialog = new MenuDialog(this); 
     }
     menuDialog.show();
     return true; 
    }
    return super.onKeyUp(keyCode, event); 
   }
  
   MenuDialog menuDialog;
   private class MenuDialog extends AlertDialog{
    
    ImageView Option1, Option2, Option3;
    
    public MenuDialog(Context context) {
     super(context);
     setTitle("Custom Menu");
     View menu = getLayoutInflater().inflate(R.layout.menu, null);
     setView(menu); 
     
     Option1 = (ImageView)menu.findViewById(R.id.opt1);
     Option2 = (ImageView)menu.findViewById(R.id.opt2);
     Option3 = (ImageView)menu.findViewById(R.id.opt3);
     
     Option1.setOnClickListener(new View.OnClickListener() {
    
    public void onClick(View v) {
     // TODO Auto-generated method stub
     Toast.makeText(CustomMenuActivity.this, "Option 1", Toast.LENGTH_LONG).show();
     dismiss();
    }
   });
     
     Option2.setOnClickListener(new View.OnClickListener() {
    
    public void onClick(View v) {
     // TODO Auto-generated method stub
     Toast.makeText(CustomMenuActivity.this, "Option 2", Toast.LENGTH_LONG).show();
     dismiss();
    }
   });
     
     Option3.setOnClickListener(new View.OnClickListener() {
      
      public void onClick(View v) {
       // TODO Auto-generated method stub
       Toast.makeText(CustomMenuActivity.this, "Option 3", Toast.LENGTH_LONG).show();
       dismiss(); 
      } 
     });
     
    }
   }
}