add a menu to my application with android

I cr开发者_运维问答eated a file option_menu.xml: in the directory /res/menu/

I created a file menu.java that contains this code:

  @Override
public boolean onCreateOptionsMenu(Menu menu) {
     MenuInflater inflater = getMenuInflater();
     inflater.inflate(R.menu.option_menu, menu);
     return true;
}

where I can put this code for my menu works?(In menu.java?

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
        case R.id.nelp:
            help();
            return true;
        case R.id.quit:
           quit();

        default:
            return super.onOptionsItemSelected(item);
    }
}

My application contains 4 java files

I Hope the menu to be accessible at any Activity.

Thank you in advance

If you want the same code to be run in several activities, you can create a base class that derives from Activity and then derive your own Activity classes from your new base class. This code would go in that class.

public class ActivityBase extends Activity {

@Override
public boolean onCreateOptionsMenu(Menu menu) {
     MenuInflater inflater = getMenuInflater();
     inflater.inflate(R.menu.option_menu, menu);
     return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
        case R.id.nelp:
            help();
            return true;
        case R.id.quit:
           quit();

        default:
            return super.onOptionsItemSelected(item);
    }
}

}

Your activities derive from ActivityBase:

public class MyActivity extends ActivityBase { ...