Solves #22

app/src/main/java/com/example/healthlog/MainActivity.java

@@ -1,6 +1,7 @@
 package com.example.healthlog;
 
 import android.app.Activity;
+import android.content.Context;
 import android.content.DialogInterface;
 import android.content.Intent;
 import android.content.SharedPreferences;
@@ -9,9 +10,13 @@
 import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.MenuItem;
+import android.widget.CompoundButton;
+import android.widget.Switch;
+
 import androidx.annotation.NonNull;
 import androidx.appcompat.app.AlertDialog;
 import androidx.appcompat.app.AppCompatActivity;
+import androidx.appcompat.app.AppCompatDelegate;
 import androidx.navigation.NavController;
 import androidx.navigation.Navigation;
 import androidx.navigation.ui.AppBarConfiguration;
@@ -24,6 +29,11 @@ public class MainActivity extends AppCompatActivity {
 
     // COMPLETED(SHANK) add logout button in appBar
 
+    private Switch mSwitch;
+    private static final String MyPREFERENCES = "nightModePrefs";
+    private static final String KEY_ISNIGHTMODE = "isNightMode";
+    SharedPreferences mSharedPreferences;
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -43,7 +53,45 @@ protected void onCreate(Bundle savedInstanceState) {
         NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);
         NavigationUI.setupActionBarWithNavController(this, navController, appBarConfiguration);
         NavigationUI.setupWithNavController(navView, navController);
+
+        mSharedPreferences = getSharedPreferences(MyPREFERENCES, Context.MODE_PRIVATE);
+        mSwitch = findViewById(R.id.theme_toggle);
+        checkNightModeActivated();
+
+        mSwitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
+            @Override
+            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
+                if(isChecked){
+                    AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES);
+                    saveNightMode(true);
+                    recreate();
+                } else {
+                    AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO);
+                    saveNightMode(false);
+                    recreate();
+                }
+            }
+        });
+    }
+
+    //save night or dark mode
+    private void saveNightMode(boolean nightMode) {
+        SharedPreferences.Editor editor =mSharedPreferences.edit();
+        editor.putBoolean(KEY_ISNIGHTMODE,nightMode);
+        editor.apply();
     }
+
+    //checking the dark theme switch
+    public void checkNightModeActivated(){
+        if(mSharedPreferences.getBoolean(KEY_ISNIGHTMODE,false)){
+            mSwitch.setChecked(true);
+            AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES);
+        } else {
+            mSwitch.setChecked(false);
+            AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO);
+        }
+    }
+
     public void dialog() {
         AlertDialog.Builder builder = new AlertDialog.Builder(this, R.style.CustomDialogTheme);
         // Set the message show for the Alert time

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

@@ -5,6 +5,14 @@
     android:layout_width="match_parent"
     android:layout_height="match_parent">
 
+    <Switch
+        android:id="@+id/theme_toggle"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_alignParentEnd="true"
+        android:layout_marginEnd="50dp"
+        android:text="Switch"></Switch>
+
     <com.google.android.material.bottomnavigation.BottomNavigationView
         android:id="@+id/nav_view"
         android:layout_width="match_parent"
@@ -20,9 +28,10 @@
         android:id="@+id/nav_host_fragment"
         android:name="androidx.navigation.fragment.NavHostFragment"
         android:layout_width="match_parent"
-        android:layout_height="match_parent"
+        android:layout_height="642dp"
         android:layout_above="@id/nav_view"
         android:layout_alignParentTop="true"
+        android:layout_marginTop="33dp"
         app:defaultNavHost="true"
         app:navGraph="@navigation/mobile_navigation" />
 

app/src/main/res/values-night/styles.xml

@@ -0,0 +1,61 @@
+<resources>
+
+    <!-- Base application theme. -->
+    <style name="AppTheme" parent="Theme.AppCompat.DayNight.DarkActionBar">
+        <!-- Customize your theme here. -->
+        <item name="colorPrimary">@color/colorPrimaryNight</item>
+        <item name="colorPrimaryDark">@color/colorPrimaryDarkNight</item>
+        <item name="colorAccent">@color/colorAccentNight</item>
+        <item name="android:statusBarColor">@color/colorPrimary</item>
+
+        <item name="android:windowBackground">@color/colorPrimaryNight</item>
+        <item name="primaryTitleColor">@color/primaryTitleColorNight</item>
+    </style>
+
+    <style name="CustomDialogTheme" parent="ThemeOverlay.AppCompat.Dialog.Alert">
+        <!--<item name="android:windowBackground">#191616</item>-->
+        <item name="android:background">#000</item>
+        <item name="android:colorPrimary">#000</item>
+        <item name="colorAccent">@color/ColorAccentSec</item>
+        <item name="android:textColorPrimary">@android:color/white</item>
+        <item name="android:textSize">16sp</item>
+    </style>
+
+    <!-- new patient layout editText theme. -->
+    <style name="NewPatientEditTextTheme" parent="Widget.AppCompat.EditText">
+        <item name="android:paddingLeft">16dp</item>
+        <item name="android:paddingBottom">16dp</item>
+        <item name="android:layout_marginLeft">32dp</item>
+        <item name="android:layout_marginRight">32dp</item>
+    </style>
+
+    <!-- patient layout textView theme. -->
+    <style name="PatientLayoutTextViewTheme" parent="Widget.AppCompat.TextView">
+        <item name="android:layout_marginLeft">16dp</item>
+        <item name="android:layout_marginBottom">16dp</item>
+    </style>
+
+
+    <!--hospital fragment top box text styles-->
+    <style name="hospitalFragmentTextHeadingStyle" parent="Widget.AppCompat.TextView">
+        <item name="android:textSize">16sp</item>
+        <item name="android:layout_margin">8dp</item>
+        <item name="android:textStyle">bold</item>
+        <item name="android:minLines">1</item>
+        <item name="android:maxLines">1</item>
+        <item name="android:ellipsize">end</item>
+    </style>
+
+    <style name="hospitalFragmentTextValueStyle" parent="Widget.AppCompat.TextView">
+        <item name="android:textSize">16sp</item>
+        <item name="android:layout_marginLeft">8dp</item>
+        <item name="android:textStyle">bold</item>
+    </style>
+
+    <!--Splash Screen Theme-->
+    <style name="splashScreenTheme" parent="Theme.MaterialComponents.NoActionBar">
+        <item name="android:windowBackground">@drawable/splash_screen</item>
+        <item name="android:statusBarColor">@color/colorPrimary</item>
+    </style>
+
+</resources>

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

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <attr name="primaryTitleColor" format="color" />
+</resources>

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

@@ -31,5 +31,12 @@
     <color name="deceasedLightText">#A7ACB1</color>
     <color name="deceasedDarkText">#6E777E</color>
 
+    <!-- dark theme colors -->
+    <color name="colorPrimaryNight">#16202c</color>
+    <color name="colorPrimaryDarkNight">#141d26</color>
+    <color name="colorAccentNight">#ffffff</color>
+
+    <color name="primaryTitleColor">#212121</color>
+    <color name="primaryTitleColorNight">#ffffff</color>
 
 </resources>

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

@@ -7,6 +7,7 @@
         <item name="colorPrimaryDark">@color/colorPrimaryLight</item>
         <item name="colorAccent">@color/colorAccent</item>
         <item name="android:statusBarColor">@color/colorPrimary</item>
+        <item name="primaryTitleColor">@color/primaryTitleColor</item>
     </style>
 
     <style name="CustomDialogTheme" parent="ThemeOverlay.AppCompat.Dialog.Alert">