made the plugin prefs container static. finished plugin headers. this has multiple advantages:

1) it is enough to parse the plugins only on first start of this
activity (not on every start of the preferences or this activity)
2) actionbar control (not possible with nested preferences)
3) it looks more fancy on tablets

mobile/AndroidManifest.xml

@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
           package="com.cradle.iitc_mobile"
-          android:versionCode="42"
+          android:versionCode="44"
-          android:versionName="0.5.8">
+          android:versionName="0.6">
 
     <uses-sdk
         android:minSdkVersion="14"

mobile/src/com/cradle/iitc_mobile/IITC_PluginPreferenceActivity.java

@@ -20,8 +20,8 @@ import java.util.TreeMap;
 public class IITC_PluginPreferenceActivity extends PreferenceActivity {
 
     private List<Header> mHeaders;
-    private TreeMap<String, ArrayList<IITC_PluginPreference>> mPlugins =
+    // we use a tree map to have a map with alphabetical order
-            new TreeMap<String, ArrayList<IITC_PluginPreference>>();
+    private static TreeMap<String, ArrayList<IITC_PluginPreference>> sPlugins = null;
 
     @Override
     public void onBuildHeaders(List<Header> target) {
@@ -29,7 +29,14 @@ public class IITC_PluginPreferenceActivity extends PreferenceActivity {
         bar.setTitle("IITC Plugins");
         bar.setDisplayHomeAsUpEnabled(true);
         mHeaders = target;
-        setUpPluginPreferenceScreen();
+        // since the plugins container is static,
+        // it is enough to parse the plugin only on first start.
+        if (sPlugins == null) {
+            Log.d("iitcm", "opened plugin prefs the first time since app start -> parse plugins");
+            sPlugins = new TreeMap<String, ArrayList<IITC_PluginPreference>>();
+            setUpPluginPreferenceScreen();
+        }
+        addHeaders();
     }
 
     @Override
@@ -44,6 +51,11 @@ public class IITC_PluginPreferenceActivity extends PreferenceActivity {
         }
     }
 
+    // called by Plugins Fragment
+    public static ArrayList<IITC_PluginPreference> getPluginPreference(String key) {
+        return sPlugins.get(key);
+    }
+
     void setUpPluginPreferenceScreen() {
 
         // get all plugins from asset manager
@@ -95,9 +107,6 @@ public class IITC_PluginPreferenceActivity extends PreferenceActivity {
                 addPluginPreference(src, file.toString(), true);
             }
         }
-
-        // now finally add the headers
-        addHeaders();
     }
 
     void addPluginPreference(String src, String plugin_key,
@@ -131,9 +140,11 @@ public class IITC_PluginPreferenceActivity extends PreferenceActivity {
         // add [User] tag to additional plugins
         if (additional)
             plugin_cat = "[User] " + plugin_cat;
-        // now we have all stuff together and can build the pref screen
+
-        if (mPlugins.containsKey(plugin_cat) == false) {
+        // now we have all stuff together and can build the preference
-            mPlugins.put(plugin_cat, new ArrayList<IITC_PluginPreference>());
+        // first check if we need a new category
+        if (sPlugins.containsKey(plugin_cat) == false) {
+            sPlugins.put(plugin_cat, new ArrayList<IITC_PluginPreference>());
             Log.d("iitcm", "create " + plugin_cat + " and add " + plugin_name);
         }
 
@@ -144,24 +155,17 @@ public class IITC_PluginPreferenceActivity extends PreferenceActivity {
         plugin_pref.setSummary(plugin_desc);
         plugin_pref.setDefaultValue(false);
         plugin_pref.setPersistent(true);
-        ArrayList<IITC_PluginPreference> list = mPlugins.get(plugin_cat);
+        ArrayList<IITC_PluginPreference> list = sPlugins.get(plugin_cat);
         list.add(plugin_pref);
     }
 
     void addHeaders() {
-        for (Map.Entry<String, ArrayList<IITC_PluginPreference>> entry : mPlugins.entrySet()) {
+        // every fragment handles 1 plugin category
+        // push the category to the fragment and add the header to the list
+        for (Map.Entry<String, ArrayList<IITC_PluginPreference>> entry : sPlugins.entrySet()) {
             Bundle bundle = new Bundle();
             String plugin_cat = entry.getKey();
-            bundle.putString("title", plugin_cat);
+            bundle.putString("category", plugin_cat);
-            ArrayList<String> pluginIds = new ArrayList<String>();
-            for (IITC_PluginPreference pref : entry.getValue()) {
-                pluginIds.add(pref.getKey());
-                ArrayList<String> plugin_vals = new ArrayList<String>();
-                plugin_vals.add(pref.getTitle().toString());
-                plugin_vals.add(pref.getSummary().toString());
-                bundle.putStringArrayList(pref.getKey(), plugin_vals);
-            }
-            bundle.putStringArrayList("ids", pluginIds);
             Header newHeader = new Header();
             newHeader.title = plugin_cat;
             newHeader.fragmentArguments = bundle;

mobile/src/com/cradle/iitc_mobile/fragments/PluginsFragment.java

@@ -5,6 +5,7 @@ import android.os.Bundle;
 import android.preference.PreferenceFragment;
 
 import com.cradle.iitc_mobile.IITC_PluginPreference;
+import com.cradle.iitc_mobile.IITC_PluginPreferenceActivity;
 import com.cradle.iitc_mobile.R;
 
 import java.util.ArrayList;
@@ -15,28 +16,25 @@ public class PluginsFragment extends PreferenceFragment {
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
+        // just a dummy to get the preferenceScreen
         addPreferencesFromResource(R.xml.pluginspreference);
 
         // alphabetical order
         getPreferenceScreen().setOrderingAsAdded(false);
 
-        // add plugin checkboxes
+        // get plugins category for this fragments and plugins list
-        ArrayList<String> ids = getArguments().getStringArrayList("ids");
+        String category = getArguments().getString("category");
-        for (String id : ids) {
+        ArrayList<IITC_PluginPreference> prefs =
-            String title = getArguments().getStringArrayList(id).get(0);
+                IITC_PluginPreferenceActivity.getPluginPreference(category);
-            String desc = getArguments().getStringArrayList(id).get(1);
+
-            IITC_PluginPreference plugin_pref = new IITC_PluginPreference(getActivity());
+        // add plugin checkbox preferences
-            plugin_pref.setKey(id);
+        for (IITC_PluginPreference pref : prefs) {
-            plugin_pref.setTitle(title);
+            getPreferenceScreen().addPreference(pref);
-            plugin_pref.setSummary(desc);
-            plugin_pref.setDefaultValue(false);
-            plugin_pref.setPersistent(true);
-            getPreferenceScreen().addPreference(plugin_pref);
         }
 
+        // set action bar stuff
         ActionBar bar = getActivity().getActionBar();
-        String actionBarTitle = getArguments().getString("title");
+        bar.setTitle("IITC Plugins: " + category);
-        bar.setTitle("IITC Plugins: " + actionBarTitle);
         bar.setDisplayHomeAsUpEnabled(true);
         getActivity().getActionBar().setDisplayHomeAsUpEnabled(true);
     }