Android Lab Test : Creating a menu context (english)
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This document provides a tutorial on how to add a contextual menu to a view in an Android application. It outlines the necessary methods and code snippets to create a contextual menu, register it to a button, and handle item selections. Additionally, it includes layout and menu resource files required for implementation.
Android Lab Test : Creating a menu context (english)
- 1. Develop on Android Android Lab Test www.AndroidLabTest.com Youku By Bruno Delb www.weibo.com/brunodelb i.youku.com/brunodelb | www.weibo.com/brunodelb | blog.delb.cn http://i.youku.com/brunoparis Weibo Officialsite Lesson : The contextual menu
- 2. The contextual menu • In this lesson, you will learn to add a contextual menu to a view. • For this, you will use the methods of the ContextMenu.
- 3. The contextual menu • In first, the contextual menu shoud be attached to an object, for example to a button : registerForContextMenu(btnMenu);
- 4. The contextual menu • The contextual menu should be created with the method onCreateContextMenu(). public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) { super.onCreateContextMenu(menu, v, menuInfo); getMenuInflater().inflate(R.menu.contextmenu, menu); menu.setHeaderTitle("Choose an option"); }
- 5. The contextual menu • To each selection of an option of the contextual menu, the method onContextItemSelected() is called with in his parameter the selected item (MenuItem). public boolean onContextItemSelected(MenuItem item) { switch(item.getItemId()) { case R.id.option1: return true; case R.id.option2: return true; case R.id.option3: return true; } return super.onContextItemSelected(item); }
- 6. Layout main.xml <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <Button android:id="@+id/btnMenu" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Menu" /> </LinearLayout>
- 7. Menu resmenucontextmenu.xml <?xml version="1.0" encoding="utf-8"?> <menu xmlns:android="http://schemas.android.com/apk/res/android"> <item android:id="@+id/option1" android:title="Option 1" /> <item android:id="@+id/option2" android:title="Option 2" /> <item android:id="@+id/option3" android:title="Option 3" /> </menu>
- 8. File Main.java public class Main extends Activity { protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Button btnMenu = (Button)findViewById (R.id.btnMenu); btnMenu.setOnClickListener(new OnClickListener() { public void onClick(View v) { openContextMenu(v); } }); registerForContextMenu(btnMenu); } public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) { super.onCreateContextMenu(menu, v, menuInfo); getMenuInflater().inflate(R.menu.contextmenu, menu); menu.setHeaderTitle("Choose an option"); }
- 9. File Main.java public boolean onContextItemSelected(MenuItem item) { switch(item.getItemId()) { case R.id.option1: Toast.makeText(this,"Option 1",1000).show(); return true; case R.id.option2: Toast.makeText(this,"Option 2",1000).show(); return true; case R.id.option3: Toast.makeText(this,"Option 3",1000).show(); return true; } return super.onContextItemSelected(item); } }
- 10. Test on your mobile View_Menu_Context
- 11. Follow me on my channel PengYooTV … On my Youku channel http://i.youku.com/brunoparis Who am I ? Bruno Delb (www.delb.cn), Author of the first french book of development of Java mobile application (2002), Consultant, project manager and developer of social & mobile applications, let’s talk about your needs ... And on Weibo : http://www.weibo.com/brunodelb