Added a prefrence to control how aggressive the fragment pager is with preloading task lists

astrid/AndroidManifest.xml

@@ -261,6 +261,15 @@
       </intent-filter>
     </activity>
     
+    <activity android:name="com.todoroo.astrid.core.PerformancePreferences"
+              android:theme="@android:style/Theme"
+              android:label="@string/EPr_performance_header">
+        <intent-filter>
+            <action android:name="com.todoroo.astrid.SETTINGS" />
+            <category android:name="android.intent.category.DEFAULT" />
+        </intent-filter>
+    </activity>
+    
     <!-- tags -->
     <receiver android:name="com.todoroo.astrid.tags.TagsPlugin">
       <intent-filter>

astrid/plugin-src/com/todoroo/astrid/core/PerformancePreferences.java

@@ -0,0 +1,21 @@
+package com.todoroo.astrid.core;
+
+import android.preference.Preference;
+
+import com.timsu.astrid.R;
+import com.todoroo.andlib.utility.TodorooPreferenceActivity;
+
+public class PerformancePreferences extends TodorooPreferenceActivity {
+
+    @Override
+    public int getPreferenceResource() {
+        return R.xml.preferences_performance;
+    }
+
+    @Override
+    public void updatePreferences(Preference preference, Object value) {
+        // TODO Auto-generated method stub
+
+    }
+
+}

astrid/res/values/keys.xml

@@ -159,6 +159,12 @@
     <item>08</item>
   </string-array>
   
+  <string-array name="EPr_swipe_lists_performance_mode_values">
+      <item>1</item>
+      <item>3</item>
+      <item>8</item>
+  </string-array>
+  
   <!-- ======================================================= APPEARANCE == -->
 
   <string name="p_colorize">colorize</string>
@@ -280,6 +286,9 @@
   <!-- default reminder mode setting (corresponds to entry in TEA_reminder_mode_once, TEA_reminder_mode_five, TEA_reminder_mode_nonstop) -->
   <string name="p_default_reminders_mode_key">rmd_default_reminder_mode</string>
   
+  <!-- swipe between lists performance mode setting -->
+  <string name="p_swipe_lists_performance_key">p_swipe_lists_perf</string>
+  
   <string-array name="EPr_default_addtocalendar_values">
     <!-- addtocalendar: labels that map EPr_default_addtocalendar items to calendar selection in settings. -->
     <item>-1</item>

astrid/res/values/strings-core.xml

@@ -540,6 +540,19 @@
   <!-- Preference screen: all task row settings -->
   <string name="EPr_taskRowPrefs_title">Task Row Appearance</string>
   
+  <!-- Preference screen: performance -->
+  <string name="EPr_performance_header">Performance</string>
+  
+  <!-- Preference: swipe between lists performance -->
+  <string name="EPr_swipe_lists_performance_title">Swipe between lists</string>
+  <string name="EPr_swipe_lists_performance_subtitle">Controls the memory performance of swipe between lists</string>
+  
+  <string-array name="EPr_swipe_lists_performance_mode">
+      <item>Memory Conservation</item>
+      <item>Normal</item>
+      <item>High Performance</item>
+  </string-array>
+    
   <string-array name="EPr_default_reminders_mode">
       <!-- reminders duration: labels for "Task Defaults" preference item. -->
       <item>@string/TEA_reminder_mode_once</item>

astrid/res/xml/preferences_performance.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<PreferenceScreen
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:title="@string/EPr_performance_header">
+    <ListPreference
+        android:key="@string/p_swipe_lists_performance_key"
+        android:title="@string/EPr_swipe_lists_performance_title"
+        android:entries="@array/EPr_swipe_lists_performance_mode"
+        android:entryValues="@array/EPr_swipe_lists_performance_mode_values" 
+        android:summary="@string/EPr_swipe_lists_performance_subtitle" />
+</PreferenceScreen>

astrid/src/com/todoroo/astrid/ui/TaskListFragmentPager.java

@@ -9,6 +9,7 @@ import android.view.MotionEvent;
 import android.view.View;
 
 import com.timsu.astrid.R;
+import com.todoroo.andlib.utility.Preferences;
 import com.todoroo.astrid.activity.TaskListFragment;
 import com.todoroo.astrid.adapter.TaskListFragmentPagerAdapter;
 import com.todoroo.astrid.api.Filter;
@@ -16,11 +17,10 @@ import com.todoroo.astrid.utility.Flags;
 
 public class TaskListFragmentPager extends ViewPager {
 
-    private static final int OFFSCREEN_PAGE_LIMIT = 2;
-
     public TaskListFragmentPager(Context context, AttributeSet attrs) {
         super(context, attrs);
-        setOffscreenPageLimit(OFFSCREEN_PAGE_LIMIT);
+        int offscreenPageLimit = Preferences.getIntegerFromString(R.string.p_swipe_lists_performance_key, 3);
+        setOffscreenPageLimit(offscreenPageLimit);
     }
 
     @Override

astrid/src/com/todoroo/astrid/utility/AstridPreferences.java

@@ -46,6 +46,7 @@ public class AstridPreferences {
         Preferences.setIfUnset(prefs, editor, r, R.string.p_rmd_default_random_hours, 0);
         Preferences.setIfUnset(prefs, editor, r, R.string.p_fontSize, 18);
         Preferences.setIfUnset(prefs, editor, r, R.string.p_showNotes, false);
+        Preferences.setIfUnset(prefs, editor, r, R.string.p_swipe_lists_performance_key, 3);
 
         if ("white-blue".equals(Preferences.getStringValue(R.string.p_theme))) { //$NON-NLS-1$ migrate from when white-blue wasn't the default
             Preferences.setString(R.string.p_theme, ThemeService.THEME_WHITE);