Android example source code file (MenuInflateFromXml.java)

This example Android source code file (MenuInflateFromXml.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

activity, android, app, arrayadapter, category, jump, linearlayout, menuinflatefromxml, order, os, override, shortcuts, spinner, string, textview, title, ui, view, visible, widget

The MenuInflateFromXml.java Android example source code

/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * 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.example.android.apis.app;

import com.example.android.apis.R;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.widget.ArrayAdapter;
import android.widget.LinearLayout;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;

/**
 * Demonstrates inflating menus from XML. There are different menu XML resources
 * that the user can choose to inflate. First, select an example resource from
 * the spinner, and then hit the menu button. To choose another, back out of the
 * activity and start over.
 */
public class MenuInflateFromXml extends Activity {
    /**
     * Different example menu resources.
     */
    private static final int sMenuExampleResources[] = {
        R.menu.title_only, R.menu.title_icon, R.menu.submenu, R.menu.groups,
        R.menu.checkable, R.menu.shortcuts, R.menu.order, R.menu.category_order,
        R.menu.visible, R.menu.disabled
    };
    
    /**
     * Names corresponding to the different example menu resources.
     */
    private static final String sMenuExampleNames[] = {
        "Title only", "Title and Icon", "Submenu", "Groups",
        "Checkable", "Shortcuts", "Order", "Category and Order",
        "Visible", "Disabled"
    };
   
    /**
     * Lets the user choose a menu resource.
     */
    private Spinner mSpinner;

    /**
     * Shown as instructions.
     */
    private TextView mInstructionsText;
    
    /**
     * Safe to hold on to this.
     */
    private Menu mMenu;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        // Create a simple layout
        LinearLayout layout = new LinearLayout(this);
        layout.setOrientation(LinearLayout.VERTICAL);
        
        // Create the spinner to allow the user to choose a menu XML
        ArrayAdapter<String> adapter = new ArrayAdapter(this,
                android.R.layout.simple_spinner_item, sMenuExampleNames); 
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        mSpinner = new Spinner(this);
        // When programmatically creating views, make sure to set an ID
        // so it will automatically save its instance state
        mSpinner.setId(R.id.spinner);
        mSpinner.setAdapter(adapter);
        
        // Add the spinner
        layout.addView(mSpinner,
                new LinearLayout.LayoutParams(
                        LinearLayout.LayoutParams.MATCH_PARENT,
                        LinearLayout.LayoutParams.WRAP_CONTENT));

        // Create help text
        mInstructionsText = new TextView(this);
        mInstructionsText.setText(getResources().getString(
                R.string.menu_from_xml_instructions_press_menu));
        
        // Add the help, make it look decent
        LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.MATCH_PARENT,
                LinearLayout.LayoutParams.WRAP_CONTENT);
        lp.setMargins(10, 10, 10, 10);
        layout.addView(mInstructionsText, lp);
        
        // Set the layout as our content view
        setContentView(layout);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Hold on to this
        mMenu = menu;
        
        // Inflate the currently selected menu XML resource.
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(sMenuExampleResources[mSpinner.getSelectedItemPosition()], menu);
        
        // Disable the spinner since we've already created the menu and the user
        // can no longer pick a different menu XML.
        mSpinner.setEnabled(false);
        
        // Change instructions
        mInstructionsText.setText(getResources().getString(
                R.string.menu_from_xml_instructions_go_back));
        
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            // For "Title only": Examples of matching an ID with one assigned in
            //                   the XML
            case R.id.jump:
                Toast.makeText(this, "Jump up in the air!", Toast.LENGTH_SHORT).show();
                return true;

            case R.id.dive:
                Toast.makeText(this, "Dive into the water!", Toast.LENGTH_SHORT).show();
                return true;

            // For "Groups": Toggle visibility of grouped menu items with
            //               nongrouped menu items
            case R.id.browser_visibility:
                // The refresh item is part of the browser group
                final boolean shouldShowBrowser = !mMenu.findItem(R.id.refresh).isVisible();
                mMenu.setGroupVisible(R.id.browser, shouldShowBrowser);
                break;
                
            case R.id.email_visibility:
                // The reply item is part of the email group
                final boolean shouldShowEmail = !mMenu.findItem(R.id.reply).isVisible();
                mMenu.setGroupVisible(R.id.email, shouldShowEmail);
                break;
                
            // Generic catch all for all the other menu resources
            default:
                // Don't toast text when a submenu is clicked
                if (!item.hasSubMenu()) {
                    Toast.makeText(this, item.getTitle(), Toast.LENGTH_SHORT).show();
                    return true;
                }
                break;
        }
        
        return false;
    }
    
    

}