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MenuInflateFromXml.javaAPI DocAndroid 1.5 API6393Wed May 06 22:41:08 BST 2009com.example.android.apis.app

MenuInflateFromXml

public class MenuInflateFromXml extends android.app.Activity
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.

Fields Summary
private static final int[]
sMenuExampleResources
Different example menu resources.
private static final String[]
sMenuExampleNames
Names corresponding to the different example menu resources.
private android.widget.Spinner
mSpinner
Lets the user choose a menu resource.
private android.widget.TextView
mInstructionsText
Shown as instructions.
private android.view.Menu
mMenu
Safe to hold on to this.
Constructors Summary
Methods Summary
protected voidonCreate(android.os.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<String>(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.FILL_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.FILL_PARENT,
                LinearLayout.LayoutParams.WRAP_CONTENT);
        lp.setMargins(10, 10, 10, 10);
        layout.addView(mInstructionsText, lp);
        
        // Set the layout as our content view
        setContentView(layout);
public booleanonCreateOptionsMenu(android.view.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;
public booleanonOptionsItemSelected(android.view.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;