Here is source code of the Program to Demonstrate Contextual Mode in Android. The program is successfully compiled and run on a Windows system using Eclipse Ide. The program output is also shown below.
Main Activity

package com.example.contextual_action_mode;

import android.app.Activity;
import android.os.Bundle;
import android.view.ActionMode;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends Activity {

protected Object actiob;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
View view = findViewById(R.id.text);
view.setOnLongClickListener(new View.OnLongClickListener() {
public boolean onLongClick(View view) {
if (actiob != null) {
return false;
}

actiob = MainActivity.this.startActionMode(actiobCallback);
view.setSelected(true);
return true;
}
});
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.main, menu);
return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
return true;
}

private ActionMode.Callback actiobCallback = new ActionMode.Callback() {

public boolean onCreateActionMode(ActionMode mode, Menu menu) {
MenuInflater inflater = mode.getMenuInflater();
inflater.inflate(R.menu.contextual, menu);
return true;
}

public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
return false;
}

public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
switch (item.getItemId()) {
case R.id.toast:
Toast.makeText(MainActivity.this, "Selected menu",
Toast.LENGTH_LONG).show();
mode.finish();
return true;
default:
return false;
}
}

public void onDestroyActionMode(ActionMode mode) {
actiob = null;
}
};
}

Activity_Main

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<EditText
android:id="@+id ext"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10" >

<requestFocus />
</EditText>

</LinearLayout>