show build timestamp in preferences

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

@@ -1,11 +1,17 @@
 package org.fox.ttrss;
 
+import android.content.pm.ApplicationInfo;
 import android.content.pm.PackageInfo;
 import android.content.pm.PackageManager;
 import android.os.Bundle;
-import android.preference.Preference;
 import android.preference.PreferenceActivity;
 
+import java.io.IOException;
+import java.text.SimpleDateFormat;
+import java.util.Locale;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipFile;
+
 public class PreferencesActivity extends PreferenceActivity {
 	@Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -13,29 +19,39 @@ public class PreferencesActivity extends PreferenceActivity {
         
         addPreferencesFromResource(R.xml.preferences);
 
-        boolean compatMode = android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.HONEYCOMB;
-
-        if (compatMode) {
-        	findPreference("webview_hardware_accel").setEnabled(false);
-        }
-        
         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 = "?";
-        String version = null;
         int versionCode = -1;
+        String buildTimestamp = "N/A";
+
         try {
-            PackageInfo packageInfo = getPackageManager().getPackageInfo(getPackageName(), 0);
+            PackageInfo packageInfo = getPackageManager().
+                    getPackageInfo(getPackageName(), 0);
 
             version = packageInfo.versionName;
             versionCode = packageInfo.versionCode;
 
+            ApplicationInfo appInfo = getPackageManager().
+                    getApplicationInfo(getPackageName(), 0);
+
+            ZipFile zf = new ZipFile(appInfo.sourceDir);
+            ZipEntry ze = zf.getEntry("classes.dex");
+            long time = ze.getTime();
+
+            buildTimestamp = new SimpleDateFormat("yyyy/MM/dd hh:mm:ss",
+                    Locale.getDefault()).format(time);
+
         } catch (PackageManager.NameNotFoundException e) {
             e.printStackTrace();
+        } catch (IOException e) {
+            e.printStackTrace();
         }
-        versionPref.setTitle(getString(R.string.version, version, versionCode));
+
+        findPreference("version").setTitle(getString(R.string.prefs_version, version, versionCode));
+        findPreference("build_timestamp").setTitle(getString(R.string.prefs_build_timestamp, buildTimestamp));
     }
 
 }

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

@@ -263,6 +263,7 @@
     <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>
+    <string name="prefs_version">Version: %1$s (%2$d)</string>
+    <string name="prefs_build_timestamp">Build timestamp: %1$s</string>
     <string name="crash_dialog_text">Unfortunately, Tiny Tiny RSS has stopped. Submit crash report to tt-rss.org?</string>
 </resources>

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

@@ -192,6 +192,10 @@
     <Preference
         android:key="version"
         android:enabled="false"
-        android:title="@string/version" />
+        android:title="@string/prefs_version" />
 
+    <Preference
+        android:key="build_timestamp"
+        android:enabled="false"
+        android:title="@string/prefs_build_timestamp" />
 </PreferenceScreen>