Android v7 Toolbar button alignment

You should add android:layout_gravity="end" for your Button :

    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="end"        android:id="@+id/showevents"        android:textSize="12sp"        android:background="@null"        android:layout_alignParentEnd="true"        android:layout_alignParentRight="true"        android:textColor="#FFF"        android:text="UPCOMING \nEVENTS"/>

Or for image on the top right:

<android.support.v7.widget.Toolbar    android:id="@+id/toolbar"    android:minHeight="?attr/actionBarSize"    android:background="@color/colorPrimary"    android:layout_width="match_parent"    android:layout_height="wrap_content"    app:title="Edit Note">    <ImageView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="right"        android:id="@+id/submitEditNote"        android:src="@android:drawable/ic_menu_send"        android:layout_alignParentEnd="true"        android:layout_alignParentRight="true" /></android.support.v7.widget.Toolbar>

I hope it helps

Your way is right but take a look at official doc: (Resourcs)

Create menu of items:

<!-- "Mark Favorite", should appear as action button if possible --><item    android:id="@+id/action_favorite"    android:icon="@drawable/ic_favorite_black_48dp"    android:title="@string/action_favorite"    app:showAsAction="ifRoom"/><!-- Settings, should always be in the overflow --><item android:id="@+id/action_settings"      android:title="@string/action_settings"      app:showAsAction="never"/>

Add menu action by ID

@Overridepublic boolean onOptionsItemSelected(MenuItem item) {    switch (item.getItemId()) {        case R.id.action_settings:            // User chose the "Settings" item, show the app settings UI...            return true;        case R.id.action_favorite:            // User chose the "Favorite" action, mark the current item            // as a favorite...            return true;        default:            // If we got here, the user's action was not recognized.            // Invoke the superclass to handle it.            return super.onOptionsItemSelected(item);    }}