Modify kitkat document provider implementation in order to cover all 'content://' cases

src/com/owncloud/android/ui/activity/FileDisplayActivity.java

@@ -949,8 +949,8 @@ OnSslUntrustedCertListener, OnEnforceableRefreshListener {
 
                 return getDataColumn(getApplicationContext(), contentUri, selection, selectionArgs);
             }
-            // Google Drive
-            else if (isGoogleDriveDocument(uri)) {
+            // Documents providers returned as content://...
+            else if (isAContentDocument(uri)) {
                 return uri.toString();
             }
         }
@@ -1041,6 +1041,15 @@ OnSslUntrustedCertListener, OnEnforceableRefreshListener {
         return "com.google.android.apps.docs.storage".equals(uri.getAuthority());
     }
 
+    /**
+     * 
+     * @param uri The Uri to check.
+     * @return Whether the Uri is from a content provider as kind "content://..."
+     */
+    public static boolean isAContentDocument(Uri uri) {
+        return uri.toString().startsWith("content://");
+    }
+
     /**
      * Pushes a directory to the drop down list
      * @param directory to push