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Displaying a Context Menu in Response of User Action

Anonymous User5624 11-Sep-2015

Android context menu appears when the user press long click on the element. It is also known as floating menu. Context Menu is a useful solution, particularly when we want to provide a list of actions based on an item click in a ListView or other AdapterView.

 

Pre-Requisites:

1.       Ellipse SDK

2.       Android SDK

3.       ADT plugin

Or Android Studio and a compatible version of JAVA SDK

Install and configure the above utilities.

Now create a new Android project namely “ContextMenusample”.

Creating a Menu Layout:

For this, navigate to res/menu/ from package explorer in Eclipse and create an xml

to define the menu itself. We’ll call this one contextmenu.xml Open

contextmenu.xml

Add following code into it:

 


<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android" >
    <item
        android:id="@+id/menu_delete"
        android:icon="@android:drawable/ic_menu_delete"
        android:title="Delete Item"/>    <item
        android:id="@+id/menu_edit"
        android:icon="@android:drawable/ic_menu_edit"
        android:title="Edit Item"/>
</menu> 
 Main Activity Class Implementation: 

Now, navigate to res/src/MainActivity from package explorer in Eclipse. Open MAinActivity.java

Add following code into it:  

package com.example.contextmenusample;
import android.app.Activity;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView.AdapterContextMenuInfo;
import android.widget.ArrayAdapter;
import android.widget.ListView;
public class MainActivity extends Activity {  
                private static String[] myList = {"MindStick", "Apple", "Microsoft", "Oracle", "Amazon",
                                                                       "Facebook", "WhatsApp"};
                @Override
                protected void onCreate(Bundle savedInstanceState) {
                                super.onCreate(savedInstanceState);
                                setContentView(R.layout.activity_main);  
                                //Creating a list view
                                ListView list = new ListView(this);  
                                //Creating an array adapter
                                ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, 
                                                                                                android.R.layout.simple_list_item_1,myList);  
                                //setting adapter to list view
                                list.setAdapter(adapter);                                   //Register a button for context events
                                registerForContextMenu(list);                                   setContentView(list);
                }
                @Override
                public boolean onCreateOptionsMenu(Menu menu) {
                                // Inflate the menu; this adds items to the action bar if it is present.                                getMenuInflater().inflate(R.menu.main, menu);                                return true;
                }  
                @Override
                public void onCreateContextMenu( ContextMenu menu, View v,
                                                                               ContextMenu.ContextMenuInfo menuinfo){                                super.onCreateContextMenu(menu, v, menuinfo);                                   //inflate the context menu
                                getMenuInflater().inflate(R.menu.contextmenu, menu);  
                                //set header name
                                menu.setHeaderTitle("Choose an option");
                }  
                @Override
                public boolean onContextItemSelected(MenuItem item){  
                                //We can obtain the item that was clicked from the
                                // bundled ContextMenuInfo object, which is an instance
                                // of AdapterContextMenuInfo in the case of a ListView
                                AdapterContextMenuInfo info = (AdapterContextMenuInfo)item.getMenuInfo();                                 int listPosition = info.position;                                   //Switch on the item's ID to find the action the user selected
                                switch (item.getItemId()) {
                                case R.id.menu_delete:
                                                //perform delete action
                                                break;
                                case R.id.menu_edit:
                                                //perform edit action
                                default:
                                                return super.onContextItemSelected(item);
                                }
                                return true;  
                }

 Running the application:

Just hit on “Run” button and our app will be launched and our list view consist of company names will be displayed:

 Displaying a Context Menu in Response of User Action

Long press click on any company name, a contextual menu will be appeared on the selected item.

Displaying a Context Menu in Response of User Action

 

Thanks for reading this post.

Happy Coding!!J

 


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