Adds a piece of sample code to highlight the navigation view on an Toolbar

Author: amlcurran

sample/src/main/java/com/github/amlcurran/showcaseview/sample/ActionItemsSampleActivity.java

@@ -8,23 +8,30 @@
 
 import com.espian.showcaseview.sample.R;
 import com.github.amlcurran.showcaseview.ShowcaseView;
+import com.github.amlcurran.showcaseview.targets.ViewTarget;
 
 public class ActionItemsSampleActivity extends AppCompatActivity {
 
     @Override
     protected void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_action_items);
-        Toolbar viewById = (Toolbar) findViewById(R.id.toolbar);
-        setSupportActionBar(viewById);
+        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
+        setSupportActionBar(toolbar);
+        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
 
-        new ShowcaseView.Builder(this)
-                .withMaterialShowcase()
-                .setTarget(new ToolbarActionItemTarget(viewById, R.id.menu_item1))
-                .setStyle(R.style.CustomShowcaseTheme2)
-                .setContentText("Here's how to highlight items on a toolbar")
-                .build()
-                .show();
+        try {
+            ViewTarget navigationButtonViewTarget = ViewTargets.navigationButtonViewTarget(toolbar);
+            new ShowcaseView.Builder(this)
+                    .withMaterialShowcase()
+                    .setTarget(navigationButtonViewTarget)
+                    .setStyle(R.style.CustomShowcaseTheme2)
+                    .setContentText("Here's how to highlight items on a toolbar")
+                    .build()
+                    .show();
+        } catch (ViewTargets.MissingViewException e) {
+            e.printStackTrace();
+        }
     }
 
     @Override

sample/src/main/java/com/github/amlcurran/showcaseview/sample/ViewTargets.java

@@ -0,0 +1,31 @@
+package com.github.amlcurran.showcaseview.sample;
+
+import android.support.v7.widget.Toolbar;
+import android.view.View;
+
+import com.github.amlcurran.showcaseview.targets.ViewTarget;
+
+import java.lang.reflect.Field;
+
+public class ViewTargets {
+
+    public static ViewTarget navigationButtonViewTarget(Toolbar toolbar) throws MissingViewException {
+        try {
+            Field field = Toolbar.class.getDeclaredField("mNavButtonView");
+            field.setAccessible(true);
+            View navigationView = (View) field.get(toolbar);
+            return new ViewTarget(navigationView);
+        } catch (NoSuchFieldException e) {
+            throw new MissingViewException(e);
+        } catch (IllegalAccessException e) {
+            throw new MissingViewException(e);
+        }
+    }
+
+    public static class MissingViewException extends Exception {
+
+        public MissingViewException(Throwable throwable) {
+            super(throwable);
+        }
+    }
+}