From d91bc22577ea998327fa08fb9f9a68b6232b979e Mon Sep 17 00:00:00 2001
From: serso <se.solovyev@gmail.com>
Date: Wed, 4 Feb 2015 20:50:01 +0100
Subject: [PATCH] Fix for ListViews which don't support headers

---
 .../preferences/BasePreferencesActivity.java  | 23 +++++++++++++------
 1 file changed, 16 insertions(+), 7 deletions(-)

diff --git a/android-app/src/main/java/org/solovyev/android/calculator/preferences/BasePreferencesActivity.java b/android-app/src/main/java/org/solovyev/android/calculator/preferences/BasePreferencesActivity.java
index e31fb86d..d52ee30c 100644
--- a/android-app/src/main/java/org/solovyev/android/calculator/preferences/BasePreferencesActivity.java
+++ b/android-app/src/main/java/org/solovyev/android/calculator/preferences/BasePreferencesActivity.java
@@ -1,7 +1,6 @@
 package org.solovyev.android.calculator.preferences;
 
 import android.content.Intent;
-import android.os.Build;
 import android.os.Bundle;
 import android.preference.PreferenceActivity;
 import android.support.v7.widget.Toolbar;
@@ -9,6 +8,7 @@ import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.LinearLayout;
+import android.widget.ListView;
 import org.solovyev.android.calculator.ActivityUi;
 import org.solovyev.android.calculator.AdView;
 import org.solovyev.android.calculator.App;
@@ -22,6 +22,7 @@ import javax.annotation.Nonnull;
 
 public abstract class BasePreferencesActivity extends PreferenceActivity {
 
+	private static boolean SUPPORT_HEADERS = true;
 	private final ActivityCheckout checkout = Checkout.forActivity(this, App.getBilling(), App.getProducts());
 	private Inventory inventory;
 	private AdView adView;
@@ -66,29 +67,37 @@ public abstract class BasePreferencesActivity extends PreferenceActivity {
 	}
 
 	protected void onShowAd(boolean show) {
-		if(!supportsAds()) {
+		if (!supportsHeaders()) {
 			return;
 		}
+
+		final ListView listView = getListView();
 		if (show) {
 			if (adView != null) {
 				return;
 			}
 			adView = (AdView) LayoutInflater.from(this).inflate(R.layout.ad, null);
 			adView.show();
-			getListView().addHeaderView(adView);
+			try {
+				listView.addHeaderView(adView);
+			} catch (IllegalStateException e) {
+				// doesn't support header views
+				SUPPORT_HEADERS = false;
+				adView.hide();
+				adView = null;
+			}
 		} else {
 			if (adView == null) {
 				return;
 			}
-			getListView().removeHeaderView(adView);
+			listView.removeHeaderView(adView);
 			adView.hide();
 			adView = null;
 		}
 	}
 
-	private boolean supportsAds() {
-		// on Android 2.3 the headers in the list view are not supported
-		return Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB;
+	private boolean supportsHeaders() {
+		return SUPPORT_HEADERS;
 	}
 
 	@Override