The file containing the source code shown below is located in the corresponding directory in <sdk>/samples/android-<version>/...
/*
* Copyright (C) 2007 The Android开源工程
*
* 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.view.View;
import android.widget.AdapterView;
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<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);
mSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
invalidateOptionsMenu();
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
// 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);
// 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();
invalidateOptionsMenu();
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;
}
}