diff --git a/app/src/main/java/org/y20k/trackbook/MainActivity.java b/app/src/main/java/org/y20k/trackbook/MainActivity.java
index 66cef11..2d57d8d 100644
--- a/app/src/main/java/org/y20k/trackbook/MainActivity.java
+++ b/app/src/main/java/org/y20k/trackbook/MainActivity.java
@@ -414,6 +414,7 @@ public class MainActivity extends AppCompatActivity implements TrackbookKeys {
                 mFloatingActionButtonSubMenu1.setOnClickListener(new View.OnClickListener() {
                     @Override
                     public void onClick(View view) {
+                        // todo check -> may produce NullPointerException
                         MainActivityMapFragment mainActivityMapFragment = (MainActivityMapFragment) mSectionsPagerAdapter.getFragment(FRAGMENT_ID_MAP);
                         mainActivityMapFragment.onActivityResult(RESULT_SAVE_DIALOG, Activity.RESULT_OK, getIntent());
                         handleStateAfterSave();
@@ -474,7 +475,7 @@ public class MainActivity extends AppCompatActivity implements TrackbookKeys {
                 mFloatingActionButtonState = FAB_STATE_RECORDING;
                 setFloatingActionButtonState();
 
-                // get last location from MainActivity Fragment
+                // get last location from MainActivity Fragment // todo check -> may produce NullPointerException
                 MainActivityMapFragment mainActivityMapFragment = (MainActivityMapFragment) mSectionsPagerAdapter.getFragment(FRAGMENT_ID_MAP);
                 Location lastLocation = mainActivityMapFragment.getCurrentBestLocation();
 
@@ -525,7 +526,7 @@ public class MainActivity extends AppCompatActivity implements TrackbookKeys {
 
         }
 
-        // update tracking state in MainActivityMapFragment
+        // update tracking state in MainActivityMapFragment // todo check -> may produce NullPointerException
         MainActivityMapFragment mainActivityMapFragment = (MainActivityMapFragment) mSectionsPagerAdapter.getFragment(FRAGMENT_ID_MAP);
         mainActivityMapFragment.setTrackingState(mTrackerServiceRunning);
     }
@@ -660,7 +661,7 @@ public class MainActivity extends AppCompatActivity implements TrackbookKeys {
                 mFloatingActionButtonState = FAB_STATE_SAVE;
                 setFloatingActionButtonState();
 
-                // pass tracking state to MainActivityMapFragment
+                // pass tracking state to MainActivityMapFragment // todo check -> may produce NullPointerException
                 MainActivityMapFragment mainActivityMapFragment = (MainActivityMapFragment) mSectionsPagerAdapter.getFragment(FRAGMENT_ID_MAP);
                 mainActivityMapFragment.setTrackingState(false);
             }
diff --git a/app/src/main/java/org/y20k/trackbook/MainActivityTrackFragment.java b/app/src/main/java/org/y20k/trackbook/MainActivityTrackFragment.java
index 6852645..e0602f2 100644
--- a/app/src/main/java/org/y20k/trackbook/MainActivityTrackFragment.java
+++ b/app/src/main/java/org/y20k/trackbook/MainActivityTrackFragment.java
@@ -36,6 +36,7 @@ import android.view.View;
 import android.view.ViewGroup;
 import android.widget.AdapterView;
 import android.widget.ImageButton;
+import android.widget.ImageView;
 import android.widget.LinearLayout;
 import android.widget.Spinner;
 import android.widget.TextView;
@@ -81,6 +82,8 @@ public class MainActivityTrackFragment extends Fragment implements AdapterView.O
     private LinearLayout mTrackManagementLayout;
     private Spinner mDropdown;
     private View mStatisticsSheet;
+    private ImageView mStatisticsIcon;
+    private TextView mStatisticsHeadline;
     private TextView mDistanceView;
     private TextView mStepsView;
     private TextView mWaypointsView;
@@ -189,6 +192,8 @@ public class MainActivityTrackFragment extends Fragment implements AdapterView.O
 
         // get views for statistics sheet
         View statisticsView = mRootView.findViewById(R.id.statistics_view);
+        mStatisticsIcon = mRootView.findViewById(R.id.statistics_icon);
+        mStatisticsHeadline = mRootView.findViewById(R.id.statistics_headline);
         mStatisticsSheet = mRootView.findViewById(R.id.statistics_sheet);
         mDistanceView = (TextView) mRootView.findViewById(R.id.statistics_data_distance);
         mStepsView = (TextView) mRootView.findViewById(R.id.statistics_data_steps);
@@ -427,10 +432,16 @@ public class MainActivityTrackFragment extends Fragment implements AdapterView.O
                     case BottomSheetBehavior.STATE_EXPANDED:
                         // statistics sheet expanded
                         mTrackManagementLayout.setVisibility(View.INVISIBLE);
+//                        mStatisticsSheet.setBackgroundColor(ContextCompat.getColor(mActivity, R.color.trackbook_blue_85percent));
+//                        mStatisticsIcon.setBackgroundResource(R.drawable.ic_statistics_white_48dp);
+//                        mStatisticsHeadline.setVisibility(View.VISIBLE);
                         break;
                     case BottomSheetBehavior.STATE_COLLAPSED:
                         // statistics sheet collapsed
                         mTrackManagementLayout.setVisibility(View.VISIBLE);
+//                        mStatisticsSheet.setBackgroundColor(ContextCompat.getColor(mActivity, R.color.trackbook_transparent));
+//                        mStatisticsIcon.setBackgroundResource(R.drawable.ic_statistics_blue_48dp);
+//                        mStatisticsHeadline.setVisibility(View.INVISIBLE);
                         mStatisticsSheetBehavior.setState(BottomSheetBehavior.STATE_COLLAPSED);
                         break;
                     case BottomSheetBehavior.STATE_HIDDEN:
@@ -449,7 +460,15 @@ public class MainActivityTrackFragment extends Fragment implements AdapterView.O
                 } else {
                     mTrackManagementLayout.setVisibility(View.INVISIBLE);
                 }
-
+//                if (slideOffset < 0.125f) {
+//                    mStatisticsSheet.setBackgroundColor(ContextCompat.getColor(mActivity, R.color.trackbook_transparent));
+//                    mStatisticsIcon.setBackgroundResource(R.drawable.ic_statistics_blue_48dp);
+//                    mStatisticsHeadline.setVisibility(View.INVISIBLE);
+//                } else {
+//                    mStatisticsSheet.setBackgroundColor(ContextCompat.getColor(mActivity, R.color.trackbook_blue_85percent));
+//                    mStatisticsIcon.setBackgroundResource(R.drawable.ic_statistics_white_48dp);
+//                    mStatisticsHeadline.setVisibility(View.VISIBLE);
+//                }
             }
         };
     }
diff --git a/app/src/main/java/org/y20k/trackbook/TrackerService.java b/app/src/main/java/org/y20k/trackbook/TrackerService.java
index a6cb245..a24256a 100644
--- a/app/src/main/java/org/y20k/trackbook/TrackerService.java
+++ b/app/src/main/java/org/y20k/trackbook/TrackerService.java
@@ -173,7 +173,7 @@ public class TrackerService extends Service implements TrackbookKeys, SensorEven
 //        stopFindingLocation();
 //        mSensorManager.unregisterListener(this);
 
-        // todo describe
+        // remove TrackerService from foreground state
         stopForeground(true);
 
         super.onDestroy();
@@ -297,7 +297,7 @@ public class TrackerService extends Service implements TrackbookKeys, SensorEven
         // disable content observer for changes in System Settings
         this.getContentResolver().unregisterContentObserver(mSettingsContentObserver);
 
-        // todo describe
+        // remove TrackerService from foreground state
         stopForeground(false);
     }
 
diff --git a/app/src/main/java/org/y20k/trackbook/helpers/StorageHelper.java b/app/src/main/java/org/y20k/trackbook/helpers/StorageHelper.java
index f4f2f6b..0f0bfe5 100644
--- a/app/src/main/java/org/y20k/trackbook/helpers/StorageHelper.java
+++ b/app/src/main/java/org/y20k/trackbook/helpers/StorageHelper.java
@@ -71,7 +71,7 @@ public class StorageHelper implements TrackbookKeys {
             mFolder.mkdirs();
         }
 
-        // create temp file object
+        // create temp file object // todo check -> may produce NullPointerException
         mTempFile = new File(mFolder.toString() + "/" + FILE_NAME_TEMP + FILE_TYPE_TRACKBOOK_EXTENSION);
 
         // delete old track - exclude temp file
diff --git a/app/src/main/res/drawable/ic_info_white_24dp.xml b/app/src/main/res/drawable/ic_info_white_24dp.xml
new file mode 100644
index 0000000..de69530
--- /dev/null
+++ b/app/src/main/res/drawable/ic_info_white_24dp.xml
@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="24.0"
+        android:viewportHeight="24.0">
+    <path
+        android:fillColor="@color/trackbook_white"
+        android:pathData="M12,2C6.48,2 2,6.48 2,12s4.48,10 10,10 10,-4.48 10,-10S17.52,2 12,2zM13,17h-2v-6h2v6zM13,9h-2L11,7h2v2z"/>
+</vector>
diff --git a/app/src/main/res/drawable/ic_statistics_white_48dp.xml b/app/src/main/res/drawable/ic_statistics_white_48dp.xml
deleted file mode 100644
index dd7aac8..0000000
--- a/app/src/main/res/drawable/ic_statistics_white_48dp.xml
+++ /dev/null
@@ -1,9 +0,0 @@
-<vector xmlns:android="http://schemas.android.com/apk/res/android"
-    android:width="48dp"
-    android:height="48dp"
-    android:viewportWidth="24.0"
-    android:viewportHeight="24.0">
-    <path
-        android:fillColor="@color/trackbook_white"
-        android:pathData="M19,3L5,3c-1.1,0 -2,0.9 -2,2v14c0,1.1 0.9,2 2,2h14c1.1,0 2,-0.9 2,-2L21,5c0,-1.1 -0.9,-2 -2,-2zM9,17L7,17v-7h2v7zM13,17h-2L11,7h2v10zM17,17h-2v-4h2v4z"/>
-</vector>
diff --git a/app/src/main/res/layout/fragment_main_track.xml b/app/src/main/res/layout/fragment_main_track.xml
index 8c88173..e48222c 100644
--- a/app/src/main/res/layout/fragment_main_track.xml
+++ b/app/src/main/res/layout/fragment_main_track.xml
@@ -76,7 +76,7 @@
         android:layout_gravity="bottom"
         android:background="@color/trackbook_blue_85percent"
         app:behavior_hideable="true"
-        app:behavior_peekHeight="132dp"
+        app:behavior_peekHeight="112dp"
         app:layout_behavior="android.support.design.widget.BottomSheetBehavior">
 
         <ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
@@ -99,9 +99,10 @@
                     android:paddingEnd="@dimen/activity_horizontal_margin"
                     android:orientation="horizontal">
                     <TextView
+                        android:id="@+id/statistics_headline"
                         android:layout_width="0dp"
                         android:layout_height="match_parent"
-                        android:textAppearance="@android:style/TextAppearance.Large.Inverse"
+                        android:textAppearance="@android:style/TextAppearance.Medium.Inverse"
                         android:layout_weight="1"
                         android:gravity="start|center"
                         android:textStyle="bold"
@@ -109,11 +110,12 @@
                         android:text="@string/statistics_sheet_h1_statistics"
                         android:contentDescription="@string/descr_statistics_sheet_headline" />
                     <ImageView
+                        android:id="@+id/statistics_icon"
                         android:layout_width="wrap_content"
                         android:layout_height="wrap_content"
                         android:gravity="end|center"
-                        android:background="@drawable/ic_statistics_white_48dp"
-                        android:contentDescription="@string/descr_statistics_sheet_icon" />
+                        android:contentDescription="@string/descr_statistics_sheet_icon"
+                        app:srcCompat="@drawable/ic_info_white_24dp" />
                 </LinearLayout>
 
                 <LinearLayout
diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml
index a85f831..e63efca 100644
--- a/app/src/main/res/values/colors.xml
+++ b/app/src/main/res/values/colors.xml
@@ -18,4 +18,7 @@
     <color name="trackbook_grey">#FF455a64</color>
     <color name="trackbook_grey_85percent">#D9455a64</color>
 
+    <color name="trackbook_transparent">#00000000</color>
+
+
 </resources>
diff --git a/build.gradle b/build.gradle
index 6952360..0b275d2 100644
--- a/build.gradle
+++ b/build.gradle
@@ -21,16 +21,16 @@ allprojects {
     }
     project.ext {
         applicationId = 'org.y20k.trackbook'
-        versionCode = 14
-        versionName = '1.0.7'
+        versionCode = 15
+        versionName = '1.0.8'
         minSdkVersion = 22
         compileSdkVersion = 26
         targetSdkVersion = 26
-        buildToolsVersion = '26.0.1'
-        supportLibraryVersion = '26.0.1'
+        buildToolsVersion = '26.0.2'
+        supportLibraryVersion = '26.1.0'
 
         osmdroidVersion = '5.6.5'
-        gsonVersion = '2.8.1'
+        gsonVersion = '2.8.2'
     }
 }