From dfc9292f73d9c4e3b532b08227de4a928fc08b3c Mon Sep 17 00:00:00 2001
From: Sergey Solovyev <se.solovyev@gmail.com>
Date: Mon, 9 Jan 2012 19:02:24 +0400
Subject: [PATCH] utils

---
 .../org/solovyev/android/AndroidUtils.java    | 31 +++++++++++++++++++
 .../CalculatorPreferencesActivity.java        |  6 ++--
 2 files changed, 34 insertions(+), 3 deletions(-)

diff --git a/src/main/java/org/solovyev/android/AndroidUtils.java b/src/main/java/org/solovyev/android/AndroidUtils.java
index f41582a9..94029dcf 100644
--- a/src/main/java/org/solovyev/android/AndroidUtils.java
+++ b/src/main/java/org/solovyev/android/AndroidUtils.java
@@ -21,6 +21,7 @@ import com.google.ads.AdRequest;
 import com.google.ads.AdSize;
 import com.google.ads.AdView;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
 import java.util.List;
 
@@ -153,5 +154,35 @@ public final class AndroidUtils {
 		return adView;
 	}
 
+	public static <T> void processViewsOfType(@NotNull View view, @NotNull Class<T> clazz, @NotNull ViewProcessor<T> viewProcessor) {
+		processViewsOfType0(view, clazz, viewProcessor);
+	}
+
+	public static void processViews(@NotNull View view, @NotNull ViewProcessor<View> viewProcessor) {
+		processViewsOfType0(view, null, viewProcessor);
+	}
+
+	private static <T> void processViewsOfType0(@NotNull View view, @Nullable Class<T> clazz, @NotNull ViewProcessor<T> viewProcessor) {
+		if (view instanceof ViewGroup) {
+			final ViewGroup viewGroup = (ViewGroup) view;
+
+			if (clazz == null || ViewGroup.class.isAssignableFrom(clazz)) {
+				//noinspection unchecked
+				viewProcessor.process((T) viewGroup);
+			}
+
+			for (int index = 0; index < viewGroup.getChildCount(); index++) {
+				processViewsOfType0(viewGroup.getChildAt(index), clazz, viewProcessor);
+			}
+		} else if (clazz == null || view.getClass().isAssignableFrom(clazz)) {
+			//noinspection unchecked
+			viewProcessor.process((T) view);
+		}
+	}
+
+	public static interface ViewProcessor<V> {
+		void process(@NotNull V view);
+	}
+
 }
 
diff --git a/src/main/java/org/solovyev/android/calculator/CalculatorPreferencesActivity.java b/src/main/java/org/solovyev/android/calculator/CalculatorPreferencesActivity.java
index 434f52ad..a8c50f1f 100644
--- a/src/main/java/org/solovyev/android/calculator/CalculatorPreferencesActivity.java
+++ b/src/main/java/org/solovyev/android/calculator/CalculatorPreferencesActivity.java
@@ -32,10 +32,10 @@ public class CalculatorPreferencesActivity extends PreferenceActivity implements
 
 		addPreferencesFromResource(R.xml.main_preferences);
 
-		final Preference addFreePreference = findPreference(CalculatorApplication.AD_FREE_P_KEY);
+		final Preference adFreePreference = findPreference(CalculatorApplication.AD_FREE_P_KEY);
 
 		if (!CalculatorApplication.isAdFree(this)) {
-			addFreePreference.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
+ 			adFreePreference.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
 				public boolean onPreferenceClick(Preference preference) {
 
 					// check billing availability
@@ -56,7 +56,7 @@ public class CalculatorPreferencesActivity extends PreferenceActivity implements
 				}
 			});
 		} else {
-			addFreePreference.setEnabled(false);
+			adFreePreference.setEnabled(false);
 		}
 
 		BillingController.registerObserver(this);