How to implement Dark (Night) mode in Android app

Light-on-dark colour scheme, also called dark mode, is a supplemental mode that uses a color scheme in which content of a webpage is displayed on a dark background. Such a color scheme reduces the light emitted by screens and enhances readability. Switching to dark mode allows website users to move to an eye-friendly and resource-saving design whenever they want.

Dark mode or night mode has been getting a lot of buzz lately as Google has included it into their Latest Android version i.e Android Q(API Level 29) and following that more and more apps started supporting dark mode natively because it has many benefits:

How to add dark mode to your android app?

1. Create a new Android Project
   
2. Create a layout and add a button or switch to toggle On/Off Dark Mode
   
3. Now Right click on values and Select Show in Explorer Option
   
4. Now copy the values folder and paste it into the same directory and rename it to “values-night”
   
5. Now you’ll see 2 colors.xml files, the normal one and one with (night) written to it
   
6. Now add these colors to colors.xml for Normal/Light Mode
   
7. And add these colors to colors.xml(night)
   
8. Add backgroundColor to your main Layout
   
9. Add textColor to your TextView’s
   
10. Now just use AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES)
    as shown below

    
    

    
    
    

    public class MainActivity     extends AppCompatActivity {        private Button btnToggleDark;        @Override     protected void onCreate(         Bundle savedInstanceState)     {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);            btnToggleDark             = findViewById(R.id.btnToggleDark);            btnToggleDark.setOnClickListener(             new View.OnClickListener() {                 @Override                 public void onClick(View view)                 {                     AppCompatDelegate                         .setDefaultNightMode(                             AppCompatDelegate                                 .MODE_NIGHT_YES);                 }             });     } }

11. Save the state of the app so that, when the user reopens the app after applying Dark/Light Mode that mode retains. We will use SharedPreferences to save the state of the app

    
    

    
    
    

    public class MainActivity     extends AppCompatActivity {        private Button btnToggleDark;        @SuppressLint("SetTextI18n")     @Override     protected void onCreate(         Bundle savedInstanceState)     {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);         btnToggleDark             = findViewById(R.id.btnToggleDark);            // Saving state of our app         // using SharedPreferences         SharedPreferences sharedPreferences             = getSharedPreferences(                 "sharedPrefs", MODE_PRIVATE);         final SharedPreferences.Editor editor             = sharedPreferences.edit();         final boolean isDarkModeOn             = sharedPreferences                   .getBoolean(                       "isDarkModeOn", false);            // When user reopens the app         // after applying dark/light mode         if (isDarkModeOn) {             AppCompatDelegate                 .setDefaultNightMode(                     AppCompatDelegate                         .MODE_NIGHT_YES);             btnToggleDark.setText(                 "Disable Dark Mode");         }         else {             AppCompatDelegate                 .setDefaultNightMode(                     AppCompatDelegate                         .MODE_NIGHT_NO);             btnToggleDark                 .setText(                     "Enable Dark Mode");         }            btnToggleDark.setOnClickListener(             new View.OnClickListener() {                    @Override                 public void onClick(View view)                 {                     // When user taps the enable/disable                     // dark mode button                     if (isDarkModeOn) {                            // if dark mode is on it                         // will turn it off                         AppCompatDelegate                             .setDefaultNightMode(                                 AppCompatDelegate                                     .MODE_NIGHT_NO);                         // it will set isDarkModeOn                         // boolean to false                         editor.putBoolean(                             "isDarkModeOn", false);                         editor.apply();                            // change text of Button                         btnToggleDark.setText(                             "Enable Dark Mode");                     }                     else {                            // if dark mode is off                         // it will turn it on                         AppCompatDelegate                             .setDefaultNightMode(                                 AppCompatDelegate                                     .MODE_NIGHT_YES);                            // it will set isDarkModeOn                         // boolean to true                         editor.putBoolean(                             "isDarkModeOn", true);                         editor.apply();                            // change text of Button                         btnToggleDark.setText(                             "Disable Dark Mode");                     }                 }             });     } }

Output: