Android Working with Contextual Action Mode

/res/menu/custom_menu.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:id="@+id/itemDelete"
        android:title="@string/delete"
        android:icon="@drawable/ic_delete_black_24dp" />
    <item android:id="@+id/itemShare"
        android:title="@string/share"
        android:icon="@drawable/ic_share_black_24dp" />
</menu>

MainActivity.java

public class MainActivity extends AppCompatActivity {

    ImageView imageView;
    ActionMode actionMode;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        imageView= (ImageView) findViewById(R.id.imageView);

        imageView.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View v) {

                if (actionMode==null)
                {
                    actionMode=startActionMode(new android.view.ActionMode.Callback() {
                        @Override
                        public boolean onCreateActionMode(android.view.ActionMode mode, Menu menu) {

                            getMenuInflater().inflate(R.menu.custom_menu,menu);

                            return true;
                        }

                        @Override
                        public boolean onPrepareActionMode(android.view.ActionMode mode, Menu menu) {
                            mode.setTitle("Item Selected");
                            return true;
                        }

                        @Override
                        public boolean onActionItemClicked(android.view.ActionMode mode, MenuItem item) {

                            if (item.getItemId()==R.id.itemShare)
                            {
                                Toast.makeText(getApplicationContext(),"Share",Toast.LENGTH_LONG).show();
                                return true;
                            }
                            else if (item.getItemId()==R.id.itemDelete)
                            {
                                Toast.makeText(getApplicationContext(),"Delete",Toast.LENGTH_LONG).show();
                                return true;
                            }

                            return false;
                        }

                        @Override
                        public void onDestroyActionMode(android.view.ActionMode mode) {
                            actionMode=null;
                        }
                    });

                    return true;
                }

                return false;
            }
        });
    }
}

References
https://github.com/mhdr/AndroidSamples/tree/master/024

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