added option: move cache to external storage

mobile/AndroidManifest.xml

@@ -14,8 +14,10 @@
     <uses-permission android:name="android.permission.USE_CREDENTIALS"/>
     <uses-permission android:name="android.permission.GET_ACCOUNTS"/>
     <uses-permission android:name="android.permission.INTERNET"/>
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
 
     <application
+        android:name=".IITC_Application"
         android:allowBackup="true"
         android:icon="@drawable/ic_iitcm"
         android:label="@string/app_name"

mobile/res/values/strings.xml

@@ -84,6 +84,8 @@
     <string name="pref_force_desktop_sum">Nice for tablets, looks awful on smartphones</string>
     <string name="pref_force_https">Force https</string>
     <string name="pref_force_https_sum">Disabling may improve performance</string>
+    <string name="pref_external_storage">Move cache to external storage</string>
+    <string name="pref_external_storage_sum">Restart required! Write cache to sdCard. Saves internal storage. External storage has to be mounted.</string>
     <string name="pref_press_twice_to_exit">Press back button twice to exit</string>
     <string name="pref_press_twice_to_exit_sum">Avoids accidental exits</string>
     <string name="pref_advanced_options">Advanced settings</string>

mobile/res/xml/preferences.xml

@@ -56,6 +56,11 @@
 	        android:title="@string/pref_force_https"
 	        android:summary="@string/pref_force_https_sum"
 	        android:defaultValue="true" />
+        <CheckBoxPreference
+            android:key="pref_external_storage"
+            android:title="@string/pref_external_storage"
+            android:summary="@string/pref_external_storage_sum"
+            android:defaultValue="false" />
         <CheckBoxPreference
                 android:key="pref_press_twice_to_exit"
                 android:title="@string/pref_press_twice_to_exit"

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

@@ -0,0 +1,17 @@
+package com.cradle.iitc_mobile;
+
+import android.app.Application;
+import android.preference.PreferenceManager;
+
+import java.io.File;
+
+public class IITC_Application extends Application {
+    @Override
+    public File getCacheDir() {
+        if (PreferenceManager.getDefaultSharedPreferences(this).getBoolean("pref_external_storage", false)) {
+            return (getExternalCacheDir() != null) ? getExternalCacheDir() : super.getCacheDir();
+        } else {
+            return super.getCacheDir();
+        }
+    }
+}

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

@@ -30,6 +30,7 @@ import android.widget.Toast;
 
 import com.cradle.iitc_mobile.IITC_NavigationHelper.Pane;
 
+import java.io.File;
 import java.io.IOException;
 import java.net.URISyntaxException;
 import java.util.Locale;
@@ -130,7 +131,8 @@ public class IITC_Mobile extends Activity implements OnSharedPreferenceChangeLis
             mIitcWebView.updateCaching(false);
         } else if (key.equals("pref_press_twice_to_exit")
                 || key.equals("pref_share_selected_tab")
-                || key.equals("pref_messages"))
+                || key.equals("pref_messages")
+                || key.equals("pref_external_storage"))
             // no reload needed
             return;
 
@@ -481,6 +483,11 @@ public class IITC_Mobile extends Activity implements OnSharedPreferenceChangeLis
         }
     }
 
+    @Override
+    public File getCacheDir() {
+        return getApplicationContext().getCacheDir();
+    }
+
     public void reloadIITC() {
         mNavigationHelper.reset();
         mMapSettings.reset();

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

@@ -44,10 +44,8 @@ public class IITC_WebView extends WebView {
         mSettings.setAllowFileAccess(true);
         mSettings.setGeolocationEnabled(true);
         mSettings.setAppCacheEnabled(true);
-        mSettings.setDatabasePath(getContext().getApplicationInfo().dataDir
+        mSettings.setDatabasePath(getContext().getApplicationInfo().dataDir + "/databases/");
-                + "/databases/");
+        mSettings.setAppCachePath(getContext().getCacheDir().getAbsolutePath());
-        mSettings.setAppCachePath(getContext().getCacheDir()
-                .getAbsolutePath());
         mJsInterface = new IITC_JSInterface((IITC_Mobile) mContext);
         addJavascriptInterface(mJsInterface, "android");
         mSharedPrefs = PreferenceManager.getDefaultSharedPreferences(mContext);