Split preferences, add chart settings activity, add button

app/src/main/AndroidManifest.xml

@@ -60,6 +60,10 @@
             android:name=".activities.SettingsActivity"
             android:label="@string/title_activity_settings"
             android:parentActivityName=".activities.ControlCenterv2" />
+        <activity
+            android:name=".activities.charts.ChartsPreferencesActivity"
+            android:label="@string/activity_prefs_charts"
+            android:parentActivityName=".activities.charts.ChartsPreferencesActivity" />
         <activity
             android:name=".devices.miband.MiBandPreferencesActivity"
             android:label="@string/preferences_miband_settings"

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/SettingsActivity.java

@@ -56,6 +56,7 @@ import nodomain.freeyourgadget.gadgetbridge.database.PeriodicExporter;
 import nodomain.freeyourgadget.gadgetbridge.devices.DeviceManager;
 import nodomain.freeyourgadget.gadgetbridge.devices.miband.MiBandPreferencesActivity;
 import nodomain.freeyourgadget.gadgetbridge.devices.zetime.ZeTimePreferenceActivity;
+import nodomain.freeyourgadget.gadgetbridge.activities.charts.ChartsPreferencesActivity;
 import nodomain.freeyourgadget.gadgetbridge.model.CannedMessagesSpec;
 import nodomain.freeyourgadget.gadgetbridge.util.AndroidUtils;
 import nodomain.freeyourgadget.gadgetbridge.util.FileUtils;
@@ -96,6 +97,16 @@ public class SettingsActivity extends AbstractSettingsActivity {
                 return true;
             }
         });
+
+        pref = findPreference("pref_charts");
+        pref.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
+            public boolean onPreferenceClick(Preference preference) {
+                Intent enableIntent = new Intent(SettingsActivity.this, ChartsPreferencesActivity.class);
+                startActivity(enableIntent);
+                return true;
+            }
+        });
+
         pref = findPreference("pref_key_miband");
         pref.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
             public boolean onPreferenceClick(Preference preference) {

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/charts/ChartsActivity.java

@@ -261,6 +261,10 @@ public class ChartsActivity extends AbstractGBFragmentActivity implements Charts
             case R.id.charts_fetch_activity_data:
                 fetchActivityData();
                 return true;
+            case R.id.prefs_charts_menu:
+                Intent settingsIntent = new Intent(this, ChartsPreferencesActivity.class);
+                startActivity(settingsIntent);
+                return true;
             default:
                 break;
         }

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/charts/ChartsPreferencesActivity.java

@@ -0,0 +1,38 @@
+/*  Copyright (C) 2015-2019 Andreas Shimokawa, Carsten Pfeiffer, Christian
+    Fischer, Daniele Gobbetti, José Rebelo, Szymon Tomasz Stefanek
+
+    This file is part of Gadgetbridge.
+
+    Gadgetbridge is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published
+    by the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    Gadgetbridge is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>. */
+package nodomain.freeyourgadget.gadgetbridge.activities.charts;
+
+import android.os.Bundle;
+
+import nodomain.freeyourgadget.gadgetbridge.GBApplication;
+import nodomain.freeyourgadget.gadgetbridge.R;
+import nodomain.freeyourgadget.gadgetbridge.activities.AbstractSettingsActivity;
+
+import nodomain.freeyourgadget.gadgetbridge.util.Prefs;
+
+
+public class ChartsPreferencesActivity extends AbstractSettingsActivity {
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        addPreferencesFromResource(R.xml.charts_preferences);
+
+
+    }
+}

app/src/main/res/menu/menu_charts.xml

@@ -7,5 +7,9 @@
         app:showAsAction="ifRoom"
         android:icon="@android:drawable/stat_notify_sync_noanim"
         android:title="@string/controlcenter_fetch_activity_data"/>
-
+    <item
+        android:id="@+id/prefs_charts_menu"
+        android:icon="@drawable/ic_settings"
+        android:title="@string/pref_header_charts"
+        app:showAsAction="ifRoom" />
 </menu>

app/src/main/res/xml/charts_preferences.xml

@@ -0,0 +1,39 @@
+<?xml version="1.0" encoding="utf-8"?>
+<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
+    <PreferenceCategory
+        android:key="pref_charts"
+        android:title="@string/activity_prefs_charts">
+
+        <EditTextPreference
+            android:inputType="number"
+            android:key="chart_max_heart_rate"
+            android:maxLength="3"
+            android:defaultValue="250"
+            android:title="@string/activity_prefs_chart_max_heart_rate" />
+
+        <EditTextPreference
+            android:inputType="number"
+            android:key="chart_min_heart_rate"
+            android:maxLength="3"
+            android:defaultValue="10"
+            android:title="@string/activity_prefs_chart_min_heart_rate" />
+        <CheckBoxPreference
+            android:layout="@layout/preference_checkbox"
+            android:defaultValue="true"
+            android:key="charts_allow_swipe"
+            android:title="@string/pref_title_charts_swipe" />
+        <CheckBoxPreference
+            android:layout="@layout/preference_checkbox"
+            android:defaultValue="true"
+            android:key="charts_show_average"
+            android:title="@string/pref_title_charts_average" />
+
+        <CheckBoxPreference
+            android:layout="@layout/preference_checkbox"
+            android:defaultValue="false"
+            android:key="charts_range"
+            android:summaryOff="@string/pref_charts_range_off"
+            android:summaryOn="@string/pref_charts_range_on"
+            android:title="@string/pref_title_charts_range" />
+    </PreferenceCategory>
+</PreferenceScreen>

app/src/main/res/xml/preferences.xml

@@ -158,42 +158,9 @@
                 android:title="@string/activity_prefs_activetime_minutes" />
         </PreferenceScreen>
     </PreferenceCategory>
-        <PreferenceScreen
+        <Preference
             android:key="pref_charts"
-            android:title="@string/activity_prefs_charts">
+            android:title="@string/activity_prefs_charts"/>
-
-            <EditTextPreference
-                android:inputType="number"
-                android:key="chart_max_heart_rate"
-                android:maxLength="3"
-                android:defaultValue="250"
-                android:title="@string/activity_prefs_chart_max_heart_rate" />
-
-            <EditTextPreference
-                android:inputType="number"
-                android:key="chart_min_heart_rate"
-                android:maxLength="3"
-                android:defaultValue="10"
-                android:title="@string/activity_prefs_chart_min_heart_rate" />
-        <CheckBoxPreference
-            android:layout="@layout/preference_checkbox"
-            android:defaultValue="true"
-            android:key="charts_allow_swipe"
-            android:title="@string/pref_title_charts_swipe" />
-        <CheckBoxPreference
-            android:layout="@layout/preference_checkbox"
-            android:defaultValue="true"
-            android:key="charts_show_average"
-            android:title="@string/pref_title_charts_average" />
-
-        <CheckBoxPreference
-            android:layout="@layout/preference_checkbox"
-            android:defaultValue="false"
-            android:key="charts_range"
-            android:summaryOff="@string/pref_charts_range_off"
-            android:summaryOn="@string/pref_charts_range_on"
-            android:title="@string/pref_title_charts_range" />
-        </PreferenceScreen>
 
     <PreferenceCategory
         android:key="pref_key_datetime"