SampleMenusActivity.java

package com.google.mcommerce.sample.android.chapter04.menu;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.SubMenu;
import android.view.View;
import android.widget.TextView;

import com.google.mcommerce.sample.android.R;

public class SampleMenusActivity extends Activity {

	// Initialize this in onCreateOptions
	Menu myMenu = null;

	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		// TextView tv = new TextView(this);
		// tv.setText("Hello, Android. Say hello");
		// setContentView(tv);

		setContentView(R.layout.c04_menu_main);

		// Before calling this method make sure
		// set the content view
		registerForContextMenu(this.getTextView());
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// call the parent to attach any system level menus
		super.onCreateOptionsMenu(menu);

		this.myMenu = menu;

		// add a few normal menus
		addRegularMenuItems(menu);

		// add a few secondary menus
		add5SecondaryMenuItems(menu);
		this.addSubMenu(menu);

		// it must return true to show the menu
		// if it is false menu won't show
		return true;
	}

	private void addRegularMenuItems(Menu menu) {
		// Secondary items are shown just like everything else
		int base = Menu.FIRST; // value is 1

		MenuItem item1 = menu.add(base, base, base, "append");
		menu.add(base, base + 1, base + 1, "XML Menus");
		menu.add(base, base + 2, base + 2, "clear");

		menu.add(base, base + 3, base + 3, "hide secondary");
		menu.add(base, base + 4, base + 4, "show secondary");

		menu.add(base, base + 5, base + 5, "enable secondary");
		menu.add(base, base + 6, base + 6, "disable secondary");

		menu.add(base, base + 7, base + 7, "check secondary");
		MenuItem item8 = menu
				.add(base, base + 8, base + 8, "uncheck secondary");

		// This will show the icon
		// It might obscure the text
		item1.setIcon(R.drawable.balloons);

		// But this does not
		item8.setIcon(R.drawable.balloons);
	}

	private void add5SecondaryMenuItems(Menu menu) {
		// Secondary items are shown just like everything else
		int base = Menu.CATEGORY_SECONDARY;

		menu.add(base, base + 1, base + 1, "sec. item 1");
		menu.add(base, base + 2, base + 2, "sec. item 2");
		menu.add(base, base + 3, base + 3, "sec. item 3");
		menu.add(base, base + 3, base + 3, "sec. item 4");
		menu.add(base, base + 4, base + 4, "sec. item 5");
	}

	private void addSubMenu(Menu menu) {
		// Secondary items are shown just like everything else
		int base = Menu.FIRST + 100;
		SubMenu sm = menu.addSubMenu(base, base + 1, Menu.NONE, "submenu");
		MenuItem item1 = sm.add(base, base + 2, base + 2, "sub item1");

		sm.add(base, base + 3, base + 3, "sub item2");
		sm.add(base, base + 4, base + 4, "sub item3");

		// work the icons
		// submenu item icons are not supported
		item1.setIcon(R.drawable.icon48x48_2);

		// the following is ok
		sm.setIcon(R.drawable.icon48x48_1);
		// This will result in an exception
		// sm.addSubMenu("try this");
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		if (item.getItemId() == 1) {
			appendText("\nhello");
		} else if (item.getItemId() == 2) {
			this.appendMenuItemText(item);
			Intent intent = new Intent(this, XMLMenusActivity.class);
			this.startActivity(intent);
		} else if (item.getItemId() == 3) {
			emptyText();
		} else if (item.getItemId() == 4) {
			// hide secondary
			this.appendMenuItemText(item);
			this.myMenu.setGroupVisible(Menu.CATEGORY_SECONDARY, false);
		} else if (item.getItemId() == 5) {
			// show secondary
			this.appendMenuItemText(item);
			this.myMenu.setGroupVisible(Menu.CATEGORY_SECONDARY, true);
		} else if (item.getItemId() == 6) {
			// enable secondary
			this.appendMenuItemText(item);
			this.myMenu.setGroupEnabled(Menu.CATEGORY_SECONDARY, true);
		} else if (item.getItemId() == 7) {
			// disable secondary
			this.appendMenuItemText(item);
			this.myMenu.setGroupEnabled(Menu.CATEGORY_SECONDARY, false);
		} else if (item.getItemId() == 8) {
			// check secondary
			this.appendMenuItemText(item);
			this.myMenu.setGroupCheckable(Menu.CATEGORY_SECONDARY, true, false);
		} else if (item.getItemId() == 9) {
			// uncheck secondary
			this.appendMenuItemText(item);
			this.myMenu
					.setGroupCheckable(Menu.CATEGORY_SECONDARY, false, false);
		} else {
			this.appendMenuItemText(item);
		}
		// should return true if the menu item
		// is handled
		return true;

		// If it is not our menu item
		// let the base class handle it
		// return super.onOptionsItemSelected(item);

	}

	// Context menu support
	@Override
	public void onCreateContextMenu(ContextMenu menu, View v,
			ContextMenuInfo menuInfo) {
		menu.setHeaderTitle("Sample menu");
		menu.add(200, 200, 200, "item1");
	}

	@Override
	public boolean onContextItemSelected(MenuItem item) {
		this.appendMenuItemText(item);
		// menu item has been handled
		return true;
	}

	// This method is here to demonstrate loading xml menu
	// You can call this method from the oncreateoptions menu
	// if you want to use the xml menu instead of programmatically
	// creating the menus.
	private void loadXMLMenu(Menu menu) {
		MenuInflater inflater = getMenuInflater(); // from activity
		inflater.inflate(R.menu.c04_my_menu, menu);
	}

	private TextView getTextView() {
		TextView tv = (TextView) this.findViewById(R.id.textViewId);
		return tv;
	}

	public void appendText(String text) {
		TextView tv = (TextView) this.findViewById(R.id.textViewId);
		tv.setText(tv.getText() + text);
	}

	private void appendMenuItemText(MenuItem menuItem) {
		String title = menuItem.getTitle().toString();
		TextView tv = (TextView) this.findViewById(R.id.textViewId);
		tv.setText(tv.getText() + "\n" + title + ":" + menuItem.getItemId());
	}

	private void emptyText() {
		TextView tv = (TextView) this.findViewById(R.id.textViewId);
		tv.setText("");
	}
}// eof-class