fragnents are stored in an adater again + updated copyright

app/build.gradle

@@ -24,11 +24,11 @@ android {
 }
 
 dependencies {
-    compile fileTree(include: ['*.jar'], dir: 'libs')
+    implementation fileTree(include: ['*.jar'], dir: 'libs')
-    compile 'com.android.support:appcompat-v7:' + supportLibraryVersion
+    implementation 'com.android.support:appcompat-v7:' + supportLibraryVersion
-    compile 'com.android.support:design:' + supportLibraryVersion
+    implementation 'com.android.support:design:' + supportLibraryVersion
-    compile 'com.android.support:cardview-v7:' + supportLibraryVersion
+    implementation 'com.android.support:cardview-v7:' + supportLibraryVersion
-    compile 'com.android.support.constraint:constraint-layout:' + constraintLayoutVersion
+    implementation 'com.android.support.constraint:constraint-layout:' + constraintLayoutVersion
-    compile 'org.osmdroid:osmdroid-android:' + osmdroidVersion
+    implementation 'org.osmdroid:osmdroid-android:' + osmdroidVersion
-    compile 'com.google.code.gson:gson:' + gsonVersion
+    implementation 'com.google.code.gson:gson:' + gsonVersion
 }

app/src/main/java/org/y20k/trackbook/MainActivity.java

@@ -6,7 +6,7 @@
  * This file is part of
  * TRACKBOOK - Movement Recorder for Android
  *
- * Copyright (c) 2016-17 - Y20K.org
+ * Copyright (c) 2016-18 - Y20K.org
  * Licensed under the MIT-License
  * http://opensource.org/licenses/MIT
  *
@@ -31,24 +31,31 @@ import android.os.Bundle;
 import android.os.Environment;
 import android.preference.PreferenceManager;
 import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
 import android.support.design.widget.BottomNavigationView;
 import android.support.design.widget.FloatingActionButton;
 import android.support.design.widget.Snackbar;
 import android.support.v4.app.DialogFragment;
 import android.support.v4.app.Fragment;
+import android.support.v4.app.FragmentManager;
+import android.support.v4.app.FragmentPagerAdapter;
 import android.support.v4.content.ContextCompat;
 import android.support.v4.content.LocalBroadcastManager;
 import android.support.v7.app.AppCompatActivity;
 import android.support.v7.widget.CardView;
+import android.util.SparseArray;
 import android.view.MenuItem;
 import android.view.View;
+import android.view.ViewGroup;
 import android.widget.Button;
 import android.widget.Toast;
 
 import org.y20k.trackbook.helpers.DialogHelper;
 import org.y20k.trackbook.helpers.LogHelper;
 import org.y20k.trackbook.helpers.TrackbookKeys;
+import org.y20k.trackbook.layout.NonSwipeableViewPager;
 
+import java.lang.ref.WeakReference;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
@@ -66,6 +73,8 @@ public class MainActivity extends AppCompatActivity implements TrackbookKeys {
 
     /* Main class variables */
     private BottomNavigationView mBottomNavigationView;
+    private NonSwipeableViewPager mViewPager;
+    private SectionsPagerAdapter mSectionsPagerAdapter;
     private boolean mTrackerServiceRunning;
     private boolean mPermissionsGranted;
     private boolean mFloatingActionButtonSubMenuVisible;
@@ -207,7 +216,7 @@ public class MainActivity extends AppCompatActivity implements TrackbookKeys {
     public void onRestoreInstanceState(Bundle savedInstanceState) {
         super.onRestoreInstanceState(savedInstanceState);
         mTrackerServiceRunning = savedInstanceState.getBoolean(INSTANCE_TRACKING_STATE, false);
-        mSelectedTab = savedInstanceState.getInt(INSTANCE_SELECTED_TAB, 0);
+        mSelectedTab = savedInstanceState.getInt(INSTANCE_SELECTED_TAB, FRAGMENT_ID_MAP);
         mFloatingActionButtonSubMenuVisible = savedInstanceState.getBoolean(INSTANCE_FAB_SUB_MENU_VISIBLE, false);
     }
 
@@ -239,6 +248,7 @@ public class MainActivity extends AppCompatActivity implements TrackbookKeys {
     private void handleStateAfterSave() {
         // display and update track tab
         mSelectedTab = FRAGMENT_ID_TRACKS;
+        mViewPager.setCurrentItem(mSelectedTab);
 
         // dismiss notification
         Intent intent = new Intent(this, TrackerService.class);
@@ -295,6 +305,14 @@ public class MainActivity extends AppCompatActivity implements TrackbookKeys {
             // point to the main map layout
             setContentView(R.layout.activity_main);
 
+            // create adapter that returns fragments for the maim map and the last track display
+            mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
+
+            // set up the ViewPager with the sections adapter.
+            mViewPager = (NonSwipeableViewPager) findViewById(R.id.container2);
+            mViewPager.setAdapter(mSectionsPagerAdapter);
+            mViewPager.setCurrentItem(mSelectedTab);
+
             // setup bottom navigation
             mBottomNavigationView = findViewById(R.id.navigation);
             mBottomNavigationView.setOnNavigationItemSelectedListener(getOnNavigationItemSelectedListener());
@@ -315,8 +333,8 @@ public class MainActivity extends AppCompatActivity implements TrackbookKeys {
             // add listeners to buttons
             addListenersToViews();
 
-            // show map fragment
+//            // show map fragment
-            showFragment(FRAGMENT_ID_MAP);
+//            showFragment(FRAGMENT_ID_MAP);
 
         } else {
             // point to the on main onboarding layout
@@ -377,7 +395,7 @@ public class MainActivity extends AppCompatActivity implements TrackbookKeys {
         mFloatingActionButtonLocation.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View view) {
-                MainActivityMapFragment mainActivityMapFragment = (MainActivityMapFragment) getFragmentFromTag(FRAGMENT_TAG_MAP);
+                MainActivityMapFragment mainActivityMapFragment = (MainActivityMapFragment) mSectionsPagerAdapter.getFragment(FRAGMENT_ID_MAP);
                 mainActivityMapFragment.handleShowMyLocation();
             }
         });
@@ -387,7 +405,7 @@ public class MainActivity extends AppCompatActivity implements TrackbookKeys {
     /* Handles tap on the button "save and clear" */
     private void handleSaveButtonClick() {
         // todo check -> may produce NullPointerException
-        MainActivityMapFragment mainActivityMapFragment = (MainActivityMapFragment) getFragmentFromTag(FRAGMENT_TAG_MAP);
+        MainActivityMapFragment mainActivityMapFragment = (MainActivityMapFragment) mSectionsPagerAdapter.getFragment(FRAGMENT_ID_MAP);
         mainActivityMapFragment.onActivityResult(RESULT_SAVE_DIALOG, Activity.RESULT_OK, getIntent());
         handleStateAfterSave();
     }
@@ -401,7 +419,7 @@ public class MainActivity extends AppCompatActivity implements TrackbookKeys {
         int dialogNegativeButton = R.string.dialog_default_action_cancel;
 
         // show delete dialog - results are handles by onActivityResult
-        MainActivityMapFragment mainActivityMapFragment = (MainActivityMapFragment) getFragmentFromTag(FRAGMENT_TAG_MAP);
+        MainActivityMapFragment mainActivityMapFragment = (MainActivityMapFragment) mSectionsPagerAdapter.getFragment(FRAGMENT_ID_MAP);
         DialogFragment dialogFragment = DialogHelper.newInstance(dialogTitle, dialogMessage, dialogPositiveButton, dialogNegativeButton);
         dialogFragment.setTargetFragment(mainActivityMapFragment, RESULT_CLEAR_DIALOG);
         dialogFragment.show(getSupportFragmentManager(), "ClearDialog");
@@ -422,7 +440,7 @@ public class MainActivity extends AppCompatActivity implements TrackbookKeys {
                 setFloatingActionButtonState();
 
                 // get last location from MainActivity Fragment // todo check -> may produce NullPointerException
-                MainActivityMapFragment mainActivityMapFragment = (MainActivityMapFragment) getFragmentFromTag(FRAGMENT_TAG_MAP);
+                MainActivityMapFragment mainActivityMapFragment = (MainActivityMapFragment) mSectionsPagerAdapter.getFragment(FRAGMENT_ID_MAP);
                 Location lastLocation = mainActivityMapFragment.getCurrentBestLocation();
 
                 if (lastLocation != null) {
@@ -472,7 +490,7 @@ public class MainActivity extends AppCompatActivity implements TrackbookKeys {
         }
 
         // update tracking state in MainActivityMapFragment // todo check -> may produce NullPointerException
-        MainActivityMapFragment mainActivityMapFragment = (MainActivityMapFragment) getFragmentFromTag(FRAGMENT_TAG_MAP);
+        MainActivityMapFragment mainActivityMapFragment = (MainActivityMapFragment) mSectionsPagerAdapter.getFragment(FRAGMENT_ID_MAP);
         mainActivityMapFragment.setTrackingState(mTrackerServiceRunning);
     }
 
@@ -558,48 +576,6 @@ public class MainActivity extends AppCompatActivity implements TrackbookKeys {
     }
 
 
-    /* Show fragment for given position */
-    private void showFragment(int pos) {
-        Fragment fragment = null;
-        String tag = null;
-
-        // define tag
-        if (pos == FRAGMENT_ID_TRACKS) {
-            tag = FRAGMENT_TAG_TRACKS;
-        } else {
-            tag = FRAGMENT_TAG_MAP;
-        }
-        // get fragment
-        fragment = getFragmentFromTag(tag);
-
-        // update selected tab
-        mSelectedTab = pos;
-
-        // place fragment in container
-        getSupportFragmentManager().beginTransaction()
-                .replace(R.id.container, fragment, tag )
-                .commit();
-    }
-
-
-    /* Returns a fragment for a given tag - creates a new instance if necessary */
-    private Fragment getFragmentFromTag(String tag) {
-        Fragment fragment = null;
-        fragment = getSupportFragmentManager().findFragmentByTag(tag);
-
-        if (fragment != null) {
-            return fragment;
-        } else {
-            if (tag.equals(FRAGMENT_TAG_TRACKS)) {
-                fragment = MainActivityTrackFragment.newInstance();
-            } else {
-                fragment = MainActivityMapFragment.newInstance();
-            }
-            return fragment;
-        }
-    }
-
-
     /* Handles taps on the bottom navigation */
     private BottomNavigationView.OnNavigationItemSelectedListener getOnNavigationItemSelectedListener() {
         return new BottomNavigationView.OnNavigationItemSelectedListener() {
@@ -615,7 +591,7 @@ public class MainActivity extends AppCompatActivity implements TrackbookKeys {
 
                         // show map fragment
                         mSelectedTab = FRAGMENT_ID_MAP;
-                        showFragment(FRAGMENT_ID_MAP);
+                        mViewPager.setCurrentItem(mSelectedTab);
 
                         return true;
 
@@ -629,7 +605,7 @@ public class MainActivity extends AppCompatActivity implements TrackbookKeys {
 
                         // show tracks fragment
                         mSelectedTab = FRAGMENT_ID_TRACKS;
-                        showFragment(FRAGMENT_ID_TRACKS);
+                        mViewPager.setCurrentItem(mSelectedTab);
 
                         return true;
 
@@ -652,7 +628,7 @@ public class MainActivity extends AppCompatActivity implements TrackbookKeys {
             case ACTION_SHOW_MAP:
                 // show map fragment
                 mSelectedTab = FRAGMENT_ID_MAP;
-                mBottomNavigationView.setSelectedItemId(FRAGMENT_ID_MAP);
+                mViewPager.setCurrentItem(mSelectedTab);
 
                 // clear intent
                 intent.setAction(ACTION_DEFAULT);
@@ -696,7 +672,7 @@ public class MainActivity extends AppCompatActivity implements TrackbookKeys {
                 setFloatingActionButtonState();
 
                 // pass tracking state to MainActivityMapFragment // todo check -> may produce NullPointerException
-                MainActivityMapFragment mainActivityMapFragment = (MainActivityMapFragment) getFragmentFromTag(FRAGMENT_TAG_MAP);
+                MainActivityMapFragment mainActivityMapFragment = (MainActivityMapFragment) mSectionsPagerAdapter.getFragment(FRAGMENT_ID_MAP);
                 mainActivityMapFragment.setTrackingState(false);
             }
         };
@@ -719,4 +695,76 @@ public class MainActivity extends AppCompatActivity implements TrackbookKeys {
         }
     }
 
+
+    /**
+     * Inner class: SectionsPagerAdapter that returns a fragment corresponding to one of the tabs.
+     * see also: https://developer.android.com/reference/android/support/v4/app/FragmentPagerAdapter.html
+     * and: http://www.truiton.com/2015/12/android-activity-fragment-communication/
+     */
+    public class SectionsPagerAdapter extends FragmentPagerAdapter {
+
+        private final SparseArray<WeakReference<Fragment>> instantiatedFragments = new SparseArray<>();
+
+        public SectionsPagerAdapter(FragmentManager fm) {
+            super(fm);
+        }
+
+        @Override
+        public Fragment getItem(int position) {
+            // getItem is called to instantiate the fragment for the given page.
+            switch (position) {
+                case FRAGMENT_ID_MAP:
+                    return new MainActivityMapFragment();
+                case FRAGMENT_ID_TRACKS:
+                    return new MainActivityTrackFragment();
+            }
+            return null;
+        }
+
+        @Override
+        public int getCount() {
+            // Show 2 total pages.
+            return 2;
+        }
+
+        @Override
+        public CharSequence getPageTitle(int position) {
+            switch (position) {
+                case FRAGMENT_ID_MAP:
+                    return getString(R.string.tab_map);
+                case FRAGMENT_ID_TRACKS:
+                    return getString(R.string.tab_last_tracks);
+            }
+            return null;
+        }
+
+        @Override
+        public Object instantiateItem(final ViewGroup container, final int position) {
+            final Fragment fragment = (Fragment) super.instantiateItem(container, position);
+            instantiatedFragments.put(position, new WeakReference<>(fragment));
+            return fragment;
+        }
+
+        @Override
+        public void destroyItem(final ViewGroup container, final int position, final Object object) {
+            instantiatedFragments.remove(position);
+            super.destroyItem(container, position, object);
+        }
+
+        @Nullable
+        public Fragment getFragment(final int position) {
+            final WeakReference<Fragment> wr = instantiatedFragments.get(position);
+            if (wr != null) {
+                return wr.get();
+            } else {
+                return null;
+            }
+        }
+
+    }
+    /**
+     * End of inner class
+     */
+
+
 }

app/src/main/java/org/y20k/trackbook/MainActivityMapFragment.java

@@ -6,7 +6,7 @@
  * This file is part of
  * TRACKBOOK - Movement Recorder for Android
  *
- * Copyright (c) 2016-17 - Y20K.org
+ * Copyright (c) 2016-18 - Y20K.org
  * Licensed under the MIT-License
  * http://opensource.org/licenses/MIT
  *

app/src/main/java/org/y20k/trackbook/MainActivityTrackFragment.java

@@ -6,7 +6,7 @@
  * This file is part of
  * TRACKBOOK - Movement Recorder for Android
  *
- * Copyright (c) 2016-17 - Y20K.org
+ * Copyright (c) 2016-18 - Y20K.org
  * Licensed under the MIT-License
  * http://opensource.org/licenses/MIT
  *
@@ -174,7 +174,7 @@ public class MainActivityTrackFragment extends Fragment implements AdapterView.O
         CompassOverlay compassOverlay = new CompassOverlay(mActivity, new InternalCompassOrientationProvider(mActivity), mMapView);
         compassOverlay.enableCompass();
         // move the compass overlay down a bit
-        compassOverlay.setCompassCenter(35.0f, 80.0f);
+        compassOverlay.setCompassCenter(35.0f, 96.0f);
         mMapView.getOverlays().add(compassOverlay);
 
         // initiate map state

app/src/main/java/org/y20k/trackbook/TrackerService.java

@@ -6,7 +6,7 @@
  * This file is part of
  * TRACKBOOK - Movement Recorder for Android
  *
- * Copyright (c) 2016-17 - Y20K.org
+ * Copyright (c) 2016-18 - Y20K.org
  * Licensed under the MIT-License
  * http://opensource.org/licenses/MIT
  *

app/src/main/java/org/y20k/trackbook/core/Track.java

@@ -6,7 +6,7 @@
  * This file is part of
  * TRACKBOOK - Movement Recorder for Android
  *
- * Copyright (c) 2016-17 - Y20K.org
+ * Copyright (c) 2016-18 - Y20K.org
  * Licensed under the MIT-License
  * http://opensource.org/licenses/MIT
  *

app/src/main/java/org/y20k/trackbook/core/TrackBundle.java

@@ -6,7 +6,7 @@
  * This file is part of
  * TRACKBOOK - Movement Recorder for Android
  *
- * Copyright (c) 2016-17 - Y20K.org
+ * Copyright (c) 2016-18 - Y20K.org
  * Licensed under the MIT-License
  * http://opensource.org/licenses/MIT
  *

app/src/main/java/org/y20k/trackbook/core/WayPoint.java

@@ -6,7 +6,7 @@
  * This file is part of
  * TRACKBOOK - Movement Recorder for Android
  *
- * Copyright (c) 2016-17 - Y20K.org
+ * Copyright (c) 2016-18 - Y20K.org
  * Licensed under the MIT-License
  * http://opensource.org/licenses/MIT
  *

app/src/main/java/org/y20k/trackbook/helpers/DialogHelper.java

@@ -6,7 +6,7 @@
  * This file is part of
  * TRACKBOOK - Movement Recorder for Android
  *
- * Copyright (c) 2016-17 - Y20K.org
+ * Copyright (c) 2016-18 - Y20K.org
  * Licensed under the MIT-License
  * http://opensource.org/licenses/MIT
  *

app/src/main/java/org/y20k/trackbook/helpers/DropdownAdapter.java

@@ -6,7 +6,7 @@
  * This file is part of
  * TRACKBOOK - Movement Recorder for Android
  *
- * Copyright (c) 2016-17 - Y20K.org
+ * Copyright (c) 2016-18 - Y20K.org
  * Licensed under the MIT-License
  * http://opensource.org/licenses/MIT
  *

app/src/main/java/org/y20k/trackbook/helpers/ExportHelper.java

@@ -6,7 +6,7 @@
  * This file is part of
  * TRACKBOOK - Movement Recorder for Android
  *
- * Copyright (c) 2016-17 - Y20K.org
+ * Copyright (c) 2016-18 - Y20K.org
  * Licensed under the MIT-License
  * http://opensource.org/licenses/MIT
  *

app/src/main/java/org/y20k/trackbook/helpers/LocationHelper.java

@@ -6,7 +6,7 @@
  * This file is part of
  * TRACKBOOK - Movement Recorder for Android
  *
- * Copyright (c) 2016-17 - Y20K.org
+ * Copyright (c) 2016-18 - Y20K.org
  * Licensed under the MIT-License
  * http://opensource.org/licenses/MIT
  *

app/src/main/java/org/y20k/trackbook/helpers/LogHelper.java

@@ -6,7 +6,7 @@
  * This file is part of
  * TRACKBOOK - Movement Recorder for Android
  *
- * Copyright (c) 2016-17 - Y20K.org
+ * Copyright (c) 2016-18 - Y20K.org
  * Licensed under the MIT-License
  * http://opensource.org/licenses/MIT
  *

app/src/main/java/org/y20k/trackbook/helpers/MapHelper.java

@@ -6,7 +6,7 @@
  * This file is part of
  * TRACKBOOK - Movement Recorder for Android
  *
- * Copyright (c) 2016-17 - Y20K.org
+ * Copyright (c) 2016-18 - Y20K.org
  * Licensed under the MIT-License
  * http://opensource.org/licenses/MIT
  *

app/src/main/java/org/y20k/trackbook/helpers/NotificationHelper.java

@@ -6,7 +6,7 @@
  * This file is part of
  * TRACKBOOK - Movement Recorder for Android
  *
- * Copyright (c) 2016-17 - Y20K.org
+ * Copyright (c) 2016-18 - Y20K.org
  * Licensed under the MIT-License
  * http://opensource.org/licenses/MIT
  *

app/src/main/java/org/y20k/trackbook/helpers/StorageHelper.java

@@ -6,7 +6,7 @@
  * This file is part of
  * TRACKBOOK - Movement Recorder for Android
  *
- * Copyright (c) 2016-17 - Y20K.org
+ * Copyright (c) 2016-18 - Y20K.org
  * Licensed under the MIT-License
  * http://opensource.org/licenses/MIT
  *

app/src/main/java/org/y20k/trackbook/helpers/TrackbookKeys.java

@@ -6,7 +6,7 @@
  * This file is part of
  * TRACKBOOK - Movement Recorder for Android
  *
- * Copyright (c) 2016-17 - Y20K.org
+ * Copyright (c) 2016-18 - Y20K.org
  * Licensed under the MIT-License
  * http://opensource.org/licenses/MIT
  * 

app/src/main/java/org/y20k/trackbook/layout/DodgeAbleLayoutBehavior.java

@@ -6,7 +6,7 @@
  * This file is part of
  * TRACKBOOK - Movement Recorder for Android
  *
- * Copyright (c) 2016-17 - Y20K.org
+ * Copyright (c) 2016-18 - Y20K.org
  * Licensed under the MIT-License
  * http://opensource.org/licenses/MIT
  *

app/src/main/java/org/y20k/trackbook/layout/NonSwipeableViewPager.java

@@ -6,7 +6,7 @@
  * This file is part of
  * TRACKBOOK - Movement Recorder for Android
  *
- * Copyright (c) 2016-17 - Y20K.org
+ * Copyright (c) 2016-18 - Y20K.org
  * Licensed under the MIT-License
  * http://opensource.org/licenses/MIT
  *

app/src/main/res/drawable/selector_bottom_navigation.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:state_checked="false" android:color="@color/trackbook_grey_lighter" />
     <item android:state_checked="true" android:color="@color/trackbook_white" />
     <item android:color="@color/trackbook_grey_lighter" />
 </selector>

app/src/main/res/layout/activity_main.xml

@@ -144,6 +144,15 @@
             app:layout_constraintRight_toRightOf="parent"
             app:menu="@menu/menu_main" />
 
+        <org.y20k.trackbook.layout.NonSwipeableViewPager
+            android:id="@+id/container2"
+            android:layout_width="0dp"
+            android:layout_height="0dp"
+            app:layout_constraintBottom_toTopOf="@+id/navigation"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toTopOf="parent" />
+
     </android.support.constraint.ConstraintLayout>
 </android.support.design.widget.CoordinatorLayout>
 

app/src/main/res/layout/fragment_main_track.xml

@@ -36,7 +36,7 @@
         android:layout_gravity="center_horizontal"
         android:background="@color/trackbook_white"
         app:behavior_hideable="false"
-        app:behavior_peekHeight="112dp"
+        app:behavior_peekHeight="54dp"
         app:layout_behavior="android.support.design.widget.BottomSheetBehavior">
 
         <ScrollView xmlns:android="http://schemas.android.com/apk/res/android"

app/src/main/res/values/colors.xml

@@ -17,7 +17,7 @@
     <color name="trackbook_white_85percent">#D9FFFFFF</color>
     <color name="trackbook_black">#FF000000</color>
 
-    <color name="trackbook_grey_lighter">#FFECEFF1</color>
+    <color name="trackbook_grey_lighter">#FFCFD8DC</color>
     <color name="trackbook_grey_light">#FF607d8b</color>
     <color name="trackbook_grey">#FF455a64</color>
     <color name="trackbook_grey_85percent">#D9455a64</color>

build.gradle

@@ -26,7 +26,7 @@ allprojects {
         minSdkVersion = 22
         compileSdkVersion = 27
         targetSdkVersion = 27
-        buildToolsVersion = '27.0.2'
+        buildToolsVersion = '27.0.3'
         supportLibraryVersion = '27.0.2'
         constraintLayoutVersion = '1.1.0-beta4'