add optional article swiping for xlarge devices

res/values/strings.xml

@@ -126,4 +126,5 @@
     <string name="dialog_close">Close</string>
     <string name="donate_select">Please select the donation</string>
     <string name="donate_do">Donate!</string>
+    <string name="tablet_article_swipe">Swipe between articles</string>
 </resources>

res/xml/preferences.xml

@@ -92,6 +92,11 @@
             android:key="combined_mode"
             android:summary="@string/combined_mode_summary"
             android:title="@string/combined_mode" />
+
+        <CheckBoxPreference
+            android:defaultValue="false"
+            android:key="tablet_article_swipe"
+            android:title="@string/tablet_article_swipe" />
     </PreferenceCategory>
 
     <PreferenceCategory android:title="@string/offline_mode" >

src/org/fox/ttrss/MainActivity.java

@@ -1709,7 +1709,7 @@ public class MainActivity extends FragmentActivity implements OnlineServices {
 
 		Fragment frag;
 		
-		if (m_smallScreenMode) {
+		if (m_smallScreenMode || m_prefs.getBoolean("tablet_article_swipe", false)) {
 			frag = new ArticlePager(article);
 		} else {
 			frag = new ArticleFragment(article);

src/org/fox/ttrss/PreferencesActivity.java

@@ -1,14 +1,20 @@
 package org.fox.ttrss;
 
+import android.content.res.Configuration;
 import android.os.Bundle;
 import android.preference.PreferenceActivity;
 
 public class PreferencesActivity extends PreferenceActivity {
 
 	@Override
-    protected void onCreate(Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
+	protected void onCreate(Bundle savedInstanceState) {
+		super.onCreate(savedInstanceState);
 
-        addPreferencesFromResource(R.xml.preferences);
-    }
+		addPreferencesFromResource(R.xml.preferences);
+
+		if ((getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) != Configuration.SCREENLAYOUT_SIZE_XLARGE) {
+			getPreferenceScreen().removePreference(
+					findPreference("tablet_article_swipe"));
+		}
+	}
 }