add version to preference xml

org.fox.ttrss/src/main/java/org/fox/ttrss/PreferencesActivity.java

@@ -1,6 +1,9 @@
 package org.fox.ttrss;
 
+import android.content.pm.PackageInfo;
+import android.content.pm.PackageManager;
 import android.os.Bundle;
+import android.preference.Preference;
 import android.preference.PreferenceActivity;
 
 public class PreferencesActivity extends PreferenceActivity {
@@ -19,6 +22,20 @@ public class PreferencesActivity extends PreferenceActivity {
         if (android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.JELLY_BEAN) {
         	findPreference("enable_condensed_fonts").setEnabled(false);
         }
+
+        Preference versionPref = (Preference)findPreference("version");
+        String version = null;
+        int versionCode = -1;
+        try {
+            PackageInfo packageInfo = getPackageManager().getPackageInfo(getPackageName(), 0);
+
+            version = packageInfo.versionName;
+            versionCode = packageInfo.versionCode;
+
+        } catch (PackageManager.NameNotFoundException e) {
+            e.printStackTrace();
+        }
+        versionPref.setTitle(getString(R.string.version, version, versionCode));
     }
 
 }

org.fox.ttrss/src/main/res/values/strings.xml

@@ -263,4 +263,5 @@
     <string name="headline_display_mode_default">Default</string>
     <string name="headline_display_mode_no_images">No images</string>
     <string name="headline_display_mode_compact">Compact</string>
+    <string name="version">Version: %1$s (%2$d)</string>
 </resources>

org.fox.ttrss/src/main/res/xml/preferences.xml

@@ -189,4 +189,9 @@
             android:title="@string/transport_debugging" />
     </PreferenceCategory>
 
+    <Preference
+        android:key="version"
+        android:enabled="false"
+        android:title="@string/version" />
+
 </PreferenceScreen>