fixed crashed on Bluetooth device found and some formatting issues in the slides.

android_app/app/src/main/java/com/health/openscale/gui/activities/BluetoothSettingsActivity.java

@@ -17,7 +17,6 @@ package com.health.openscale.gui.activities;
 
 import android.app.Activity;
 import android.app.AlertDialog;
-import android.app.DatePickerDialog;
 import android.bluetooth.BluetoothDevice;
 import android.bluetooth.le.ScanResult;
 import android.content.Context;
@@ -27,54 +26,38 @@ import android.content.SharedPreferences;
 import android.content.pm.PackageManager;
 import android.graphics.Color;
 import android.graphics.PorterDuff;
-import android.graphics.drawable.Drawable;
 import android.net.Uri;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.Looper;
 import android.os.Message;
-import android.preference.Preference;
 import android.preference.PreferenceManager;
-import android.preference.PreferenceScreen;
 import android.text.SpannableStringBuilder;
 import android.text.Spanned;
 import android.text.style.ForegroundColorSpan;
 import android.text.style.RelativeSizeSpan;
-import android.view.Menu;
+import android.view.Gravity;
-import android.view.MenuInflater;
 import android.view.MenuItem;
 import android.view.View;
-import android.widget.DatePicker;
-import android.widget.EditText;
 import android.widget.ImageView;
 import android.widget.LinearLayout;
 import android.widget.ProgressBar;
-import android.widget.RadioGroup;
-import android.widget.Spinner;
 import android.widget.TextView;
 import android.widget.Toast;
 
 import androidx.appcompat.widget.Toolbar;
-import androidx.core.graphics.drawable.DrawableCompat;
 
 import com.health.openscale.R;
 import com.health.openscale.core.OpenScale;
 import com.health.openscale.core.bluetooth.BluetoothCommunication;
 import com.health.openscale.core.bluetooth.BluetoothFactory;
-import com.health.openscale.core.datatypes.ScaleUser;
-import com.health.openscale.core.utils.Converters;
-import com.health.openscale.gui.preferences.BluetoothPreferences;
 import com.health.openscale.gui.utils.ColorUtil;
 import com.health.openscale.gui.utils.PermissionHelper;
 import com.welie.blessed.BluetoothCentral;
 import com.welie.blessed.BluetoothCentralCallback;
 import com.welie.blessed.BluetoothPeripheral;
 
-import java.text.DateFormat;
-import java.util.Calendar;
-import java.util.Date;
 import java.util.HashMap;
-import java.util.List;
 import java.util.Map;
 
 import timber.log.Timber;
@@ -215,7 +198,6 @@ public class BluetoothSettingsActivity extends BaseAppCompatActivity {
         if (btDevice != null) {
             Timber.d("Found supported device %s (driver: %s)",
                     formatDeviceName(device), btDevice.driverName());
-            deviceView.setOnClickListener(new onClickListenerDeviceSelect());
             deviceView.setDeviceAddress(device.getAddress());
             deviceView.setIcon(R.drawable.ic_bluetooth_device_supported);
             deviceView.setSummaryText(btDevice.driverName());
@@ -242,24 +224,6 @@ public class BluetoothSettingsActivity extends BaseAppCompatActivity {
         deviceListView.addView(deviceView);
     }
 
-    private class onClickListenerDeviceSelect implements View.OnClickListener {
-        @Override
-        public void onClick(View view) {
-            BluetoothDeviceView deviceView = (BluetoothDeviceView)view;
-
-            BluetoothDevice device = foundDevices.get(deviceView.getDeviceAddress());
-
-            SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
-
-            prefs.edit()
-                    .putString(PREFERENCE_KEY_BLUETOOTH_HW_ADDRESS, device.getAddress())
-                    .putString(PREFERENCE_KEY_BLUETOOTH_DEVICE_NAME, device.getName())
-                    .apply();
-
-            finishActivity(GET_SCALE_REQUEST);
-        }
-    }
-
     private void getDebugInfo(final BluetoothDevice device) {
         AlertDialog.Builder builder = new AlertDialog.Builder(this);
         builder.setTitle("Fetching info")
@@ -293,7 +257,7 @@ public class BluetoothSettingsActivity extends BaseAppCompatActivity {
         OpenScale.getInstance().connectToBluetoothDeviceDebugMode(macAddress, btHandler);
     }
 
-    private class BluetoothDeviceView extends LinearLayout {
+    private class BluetoothDeviceView extends LinearLayout implements View.OnClickListener {
 
         private TextView deviceName;
         private ImageView deviceIcon;
@@ -302,9 +266,26 @@ public class BluetoothSettingsActivity extends BaseAppCompatActivity {
         public BluetoothDeviceView(Context context) {
             super(context);
 
+            LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
+                    LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
+
+            layoutParams.setMargins(0, 20, 0, 20);
+            setLayoutParams(layoutParams);
+
             deviceName = new TextView(context);
             deviceName.setLines(2);
-            deviceIcon = new ImageView(context);
+            deviceIcon = new ImageView(context);;
+
+            LinearLayout.LayoutParams centerLayoutParams = new LinearLayout.LayoutParams(
+                    LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.MATCH_PARENT);
+            layoutParams.gravity= Gravity.CENTER;
+
+            deviceIcon.setLayoutParams(centerLayoutParams);
+            deviceName.setLayoutParams(centerLayoutParams);
+
+            deviceName.setOnClickListener(this);
+            deviceIcon.setOnClickListener(this);
+            setOnClickListener(this);
 
             addView(deviceIcon);
             addView(deviceName);
@@ -359,6 +340,24 @@ public class BluetoothSettingsActivity extends BaseAppCompatActivity {
             deviceName.setEnabled(status);
             deviceIcon.setEnabled(status);
         }
+
+        @Override
+        public void onClick(View view) {
+            BluetoothDevice device = foundDevices.get(getDeviceAddress());
+
+            SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
+
+            prefs.edit()
+                    .putString(PREFERENCE_KEY_BLUETOOTH_HW_ADDRESS, device.getAddress())
+                    .putString(PREFERENCE_KEY_BLUETOOTH_DEVICE_NAME, device.getName())
+                    .apply();
+
+            Timber.d("Saved Bluetooth device " + device.getName() + " with address " + device.getAddress());
+
+            stopBluetoothDiscovery();
+            setResult(GET_SCALE_REQUEST);
+            finish();
+        }
     }
 
     @Override

android_app/app/src/main/java/com/health/openscale/gui/preferences/BluetoothPreferences.java

@@ -15,51 +15,21 @@
  */
 package com.health.openscale.gui.preferences;
 
-import android.app.Activity;
-import android.app.AlertDialog;
-import android.app.Fragment;
-import android.bluetooth.BluetoothDevice;
-import android.bluetooth.le.ScanResult;
-import android.content.DialogInterface;
 import android.content.Intent;
 import android.content.SharedPreferences;
-import android.content.pm.PackageManager;
-import android.graphics.PorterDuff;
-import android.net.Uri;
 import android.os.Bundle;
-import android.os.Handler;
-import android.os.Looper;
-import android.os.Message;
 import android.preference.Preference;
 import android.preference.PreferenceFragment;
-import android.preference.PreferenceScreen;
 import android.widget.BaseAdapter;
-import android.widget.Toast;
 
 import com.health.openscale.R;
-import com.health.openscale.core.OpenScale;
-import com.health.openscale.core.bluetooth.BluetoothCommunication;
-import com.health.openscale.core.bluetooth.BluetoothFactory;
 import com.health.openscale.gui.activities.BluetoothSettingsActivity;
-import com.health.openscale.gui.activities.UserSettingsActivity;
-import com.health.openscale.gui.utils.ColorUtil;
-import com.health.openscale.gui.utils.PermissionHelper;
-import com.welie.blessed.BluetoothCentral;
-import com.welie.blessed.BluetoothCentralCallback;
-import com.welie.blessed.BluetoothPeripheral;
-
-import java.util.HashMap;
-import java.util.Map;
-
-import timber.log.Timber;
-
-import static android.app.Activity.RESULT_OK;
 
 
 public class BluetoothPreferences extends PreferenceFragment {
     private static final String PREFERENCE_KEY_BLUETOOTH_SCANNER = "btScanner";
 
-    private PreferenceScreen btScanner;
+    private Preference btScanner;
 
     private static final String formatDeviceName(String name, String address) {
         if (name.isEmpty() || address.isEmpty()) {
@@ -87,7 +57,7 @@ public class BluetoothPreferences extends PreferenceFragment {
 
         addPreferencesFromResource(R.xml.bluetooth_preferences);
 
-        btScanner = (PreferenceScreen) findPreference(PREFERENCE_KEY_BLUETOOTH_SCANNER);
+        btScanner = (Preference) findPreference(PREFERENCE_KEY_BLUETOOTH_SCANNER);
 
         btScanner.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
             @Override
@@ -99,16 +69,12 @@ public class BluetoothPreferences extends PreferenceFragment {
         });
 
         updateBtScannerSummary();
-
-        // Dummy preference to make screen open
-        btScanner.addPreference(new Preference(getActivity()));
     }
 
     @Override
     public void onActivityResult(int requestCode, int resultCode, Intent data) {
-        if (resultCode != RESULT_OK) {
+        super.onActivityResult(requestCode, resultCode, data);
-            return;
+
-        }
         if (requestCode == BluetoothSettingsActivity.GET_SCALE_REQUEST) {
             updateBtScannerSummary();
         }

android_app/app/src/main/java/com/health/openscale/gui/slides/BluetoothIntroSlide.java

@@ -31,8 +31,6 @@ import androidx.fragment.app.Fragment;
 import com.health.openscale.R;
 import com.health.openscale.gui.activities.BluetoothSettingsActivity;
 
-import static android.app.Activity.RESULT_OK;
-
 public class BluetoothIntroSlide extends Fragment {
     private static final String ARG_LAYOUT_RES_ID = "layoutResId";
     private int layoutResId;
@@ -82,9 +80,6 @@ public class BluetoothIntroSlide extends Fragment {
 
     @Override
     public void onActivityResult(int requestCode, int resultCode, Intent data) {
-        if (resultCode != RESULT_OK) {
-            return;
-        }
         if (requestCode == BluetoothSettingsActivity.GET_SCALE_REQUEST) {
             txtFoundDevice.setText(getCurrentDeviceName());
         }

android_app/app/src/main/res/layout/activity_bluetoothsettings.xml

@@ -30,7 +30,8 @@
         style="?android:attr/progressBarStyle"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:visibility="gone"/>
+        android:layout_margin="20px"
+        android:visibility="gone" />
 
     <LinearLayout
         android:id="@+id/deviceListView"

android_app/app/src/main/res/layout/slide_bluetooth.xml

@@ -1,9 +1,13 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="wrap_content"
+    android:layout_height="wrap_content"
+    android:background="@android:color/white">
+
+    <LinearLayout
         android:layout_width="match_parent"
-    android:layout_height="match_parent"
+        android:layout_height="wrap_content"
-    android:background="@android:color/white"
         android:gravity="center_horizontal"
         android:orientation="vertical">
 
@@ -11,8 +15,8 @@
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_gravity="center"
-        android:layout_marginTop="40dp"
+            android:layout_marginTop="30dp"
-        android:layout_marginBottom="40dp"
+            android:layout_marginBottom="30dp"
             android:orientation="horizontal">
 
             <ImageView
@@ -30,23 +34,13 @@
                 android:textSize="20sp" />
         </LinearLayout>
 
-    <ScrollView
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content">
-
-        <LinearLayout
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            android:gravity="center_horizontal"
-            android:orientation="vertical">
-
         <TextView
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_marginBottom="40dp"
             android:gravity="center"
             android:text="@string/label_slide_bluetooth_top_text"
-                android:textSize="18sp"
+            android:textSize="16sp"
             android:textStyle="bold" />
 
         <ImageView
@@ -65,14 +59,14 @@
             android:layout_marginBottom="20dp"
             android:gravity="center"
             android:text="@string/label_slide_bluetooth_main_text"
-                android:textSize="16sp" />
+            android:textSize="14sp" />
 
         <TextView
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_marginBottom="10dp"
             android:text="@string/label_your_bluetooth_scale"
-                android:textSize="16sp"
+            android:textSize="14sp"
             android:textStyle="bold" />
 
         <TextView
@@ -81,18 +75,22 @@
             android:layout_height="wrap_content"
             android:layout_marginBottom="20dp"
             android:text="@string/label_empty"
-                android:textSize="16sp" />
+            android:textSize="14sp" />
 
         <Button
             android:id="@+id/btnSearchScale"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
-                android:layout_marginBottom="100dp"
             android:background="@drawable/flat_selector"
             android:text="Add Bluetooth scale"
             android:paddingLeft="10dp"
             android:paddingRight="10dp"
-                android:textColor="@android:color/white" />
+            android:textColor="@android:color/white"
+            android:textSize="14sp"/>
+
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginBottom="250px"/>
     </LinearLayout>
-    </ScrollView>
+</ScrollView>
-</LinearLayout>

android_app/app/src/main/res/layout/slide_metrics.xml

@@ -1,9 +1,13 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    android:background="@android:color/white"
+    android:background="@android:color/white">
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
         android:gravity="center_horizontal"
         android:orientation="vertical">
 
@@ -11,8 +15,8 @@
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_gravity="center"
-        android:layout_marginTop="40dp"
+            android:layout_marginTop="30dp"
-        android:layout_marginBottom="40dp"
+            android:layout_marginBottom="30dp"
             android:orientation="horizontal">
 
             <ImageView
@@ -36,7 +40,7 @@
             android:layout_marginBottom="40dp"
             android:gravity="center"
             android:text="@string/label_slide_metrics_top_text"
-        android:textSize="18sp"
+            android:textSize="16sp"
             android:textStyle="bold" />
 
         <ImageView
@@ -56,6 +60,11 @@
             android:layout_marginBottom="20dp"
             android:gravity="center"
             android:text="@string/label_slide_metrics_main_text"
-        android:textSize="16sp" />
+            android:textSize="14sp" />
 
-</LinearLayout>
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginBottom="250px"/>
+    </LinearLayout>
+</ScrollView>

android_app/app/src/main/res/layout/slide_opensource.xml

@@ -1,9 +1,13 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    android:background="@android:color/white"
+    android:background="@android:color/white">
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
         android:gravity="center_horizontal"
         android:orientation="vertical">
 
@@ -11,8 +15,8 @@
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_gravity="center"
-        android:layout_marginTop="40dp"
+            android:layout_marginTop="30dp"
-        android:layout_marginBottom="40dp"
+            android:layout_marginBottom="30dp"
             android:orientation="horizontal">
 
             <ImageView
@@ -36,7 +40,7 @@
             android:layout_marginBottom="40dp"
             android:gravity="center"
             android:text="@string/label_slide_opensource_top_text"
-        android:textSize="18sp"
+            android:textSize="16sp"
             android:textStyle="bold" />
 
         <ImageView
@@ -56,6 +60,12 @@
             android:layout_marginBottom="20dp"
             android:gravity="center"
             android:text="@string/label_slide_opensource_main_text"
-        android:textSize="16sp" />
+            android:textSize="14sp" />
 
-</LinearLayout>
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginBottom="250px"/>
+
+    </LinearLayout>
+</ScrollView>

android_app/app/src/main/res/layout/slide_privacy.xml

@@ -1,9 +1,13 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    android:background="@android:color/white"
+    android:background="@android:color/white">
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
         android:gravity="center_horizontal"
         android:orientation="vertical">
 
@@ -11,8 +15,8 @@
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_gravity="center"
-        android:layout_marginTop="40dp"
+            android:layout_marginTop="30dp"
-        android:layout_marginBottom="40dp"
+            android:layout_marginBottom="30dp"
             android:orientation="horizontal">
 
             <ImageView
@@ -36,7 +40,7 @@
             android:layout_marginBottom="40dp"
             android:gravity="center"
             android:text="@string/label_slide_privacy_top_text"
-        android:textSize="18sp"
+            android:textSize="16sp"
             android:textStyle="bold" />
 
         <ImageView
@@ -56,6 +60,11 @@
             android:layout_marginBottom="20dp"
             android:gravity="center"
             android:text="@string/label_slide_privacy_main_text"
-        android:textSize="16sp" />
+            android:textSize="14sp" />
 
-</LinearLayout>
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginBottom="250px"/>
+    </LinearLayout>
+</ScrollView>

android_app/app/src/main/res/layout/slide_support.xml

@@ -1,9 +1,13 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    android:background="@android:color/white"
+    android:background="@android:color/white">
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
         android:gravity="center_horizontal"
         android:orientation="vertical">
 
@@ -11,8 +15,8 @@
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_gravity="center"
-        android:layout_marginTop="40dp"
+            android:layout_marginTop="30dp"
-        android:layout_marginBottom="40dp"
+            android:layout_marginBottom="30dp"
             android:orientation="horizontal">
 
             <ImageView
@@ -36,7 +40,7 @@
             android:layout_marginBottom="40dp"
             android:gravity="center"
             android:text="@string/label_slide_support_top_text"
-        android:textSize="18sp"
+            android:textSize="16sp"
             android:textStyle="bold" />
 
         <ImageView
@@ -56,6 +60,11 @@
             android:layout_marginBottom="20dp"
             android:gravity="center"
             android:text="@string/label_slide_support_main_text"
-        android:textSize="16sp" />
+            android:textSize="14sp" />
 
-</LinearLayout>
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginBottom="250px"/>
+    </LinearLayout>
+</ScrollView>

android_app/app/src/main/res/layout/slide_user.xml

@@ -1,9 +1,13 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
-    android:layout_height="match_parent"
+    android:layout_height="wrap_content"
-    android:background="@android:color/white"
+    android:background="@android:color/white">
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
         android:gravity="center_horizontal"
         android:orientation="vertical">
 
@@ -11,8 +15,8 @@
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_gravity="center"
-        android:layout_marginTop="40dp"
+            android:layout_marginTop="30dp"
-        android:layout_marginBottom="40dp"
+            android:layout_marginBottom="30dp"
             android:orientation="horizontal">
 
             <ImageView
@@ -36,7 +40,7 @@
             android:layout_marginBottom="40dp"
             android:gravity="center"
             android:text="@string/label_slide_user_top_text"
-        android:textSize="18sp"
+            android:textSize="16sp"
             android:textStyle="bold" />
 
         <ImageView
@@ -55,24 +59,13 @@
             android:layout_marginBottom="20dp"
             android:gravity="center"
             android:text="@string/label_slide_user_main_text"
-        android:textSize="16sp" />
+            android:textSize="14sp" />
-
-    <ScrollView
-        android:layout_width="match_parent"
-        android:layout_height="100dp">
-
-        <LinearLayout
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:orientation="vertical">
 
         <TableLayout
             android:id="@+id/tblUsers"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:layout_marginBottom="20dp" />
-        </LinearLayout>
-    </ScrollView>
 
         <Button
             android:id="@+id/btnAddUser"
@@ -82,6 +75,12 @@
             android:text="@string/label_add_user"
             android:paddingLeft="10dp"
             android:paddingRight="10dp"
-        android:textColor="@android:color/white" />
+            android:textColor="@android:color/white"
+            android:textSize="14sp"/>
 
-</LinearLayout>
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginBottom="250px"/>
+    </LinearLayout>
+</ScrollView>

android_app/app/src/main/res/layout/slide_welcome.xml

@@ -1,9 +1,13 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    android:background="@android:color/white"
+    android:background="@android:color/white">
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
         android:gravity="center_horizontal"
         android:orientation="vertical">
 
@@ -21,11 +25,9 @@
             android:layout_marginBottom="40dp"
             android:text="@string/label_slide_welcome_top_text"
             android:gravity="center"
-        android:textSize="28sp"
+            android:textSize="26sp"
             android:textStyle="bold" />
 
-
-
         <TextView
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
@@ -34,6 +36,11 @@
             android:layout_marginBottom="20dp"
             android:gravity="center"
             android:text="@string/label_slide_welcome_main_text"
-        android:textSize="16sp" />
+            android:textSize="14sp" />
 
-</LinearLayout>
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginBottom="250px"/>
+    </LinearLayout>
+</ScrollView>

android_app/app/src/main/res/xml/bluetooth_preferences.xml

@@ -1,9 +1,9 @@
 <?xml version="1.0" encoding="utf-8"?>
 <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
-    <PreferenceScreen
+    <Preference
         android:key="btScanner"
         android:title="@string/label_your_bluetooth_scale"
-        android:persistent="false" />
+        android:persistent="false"/>
     <CheckBoxPreference
         android:defaultValue="true"
         android:key="mergeWithLastMeasurement"