How to enable night mode programmatically?

Question

I am looking for a way to enable night mode programmatically with an Android code:

public static void setNightMode(Context target , boolean state){

    UiM         


        

Answer 1

SIMPLEST SOLUTION

You can enable/disable dark theme just by:

1. enable dark theme:

   AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES)
   

2. forcefully disable dark theme:

   AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO)
   

3. set app theme based on mobile settings of dark mode, i.e. if dark mode is enabled then the theme will be set to a dark theme, if not then the default theme, but this will only work in version >= Android version Q

   AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM)
   

Notes:

1. Your base theme for app/activity should be

"Theme.AppCompat.DayNight"

like

<style name="DarkTheme" parent="Theme.AppCompat.DayNight">
    <item name="windowActionBar">false</item>
    <item name="windowNoTitle">true</item>
</style>

2. Your res folder's names would end with -night so that different colors and images you can set for day and night themes like

drawable & drawable-night,
values & values-night

Answer 2

Make sure to change the default theme from Theme.AppCompat.Light.DarkActionBar to Theme.AppCompat.DayNight.DarkActionBar in the styles.xml file and then do AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES) to switch to the night mode. I have tested it in APIv23(Android 6.0) and above and it is working fine. For a better explanation see this codelab by Android

Answer 3

NightOwl has its own implementation for switching day/night mode on Android. Getting started with NightOwl is super easy. Here's a code snippet:

Init the NightOwl in Application class,

NightOwl.builder().defaultMode(0).create();

Call three method in your Activity class,

public class DemoActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // step1 before super.onCreate
        NightOwl.owlBeforeCreate(this);

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_demo);

        // step2 after setContentView
        NightOwl.owlAfterCreate(this);

        // write your code
    }

    @Override
    protected void onResume() {
        super.onResume();

        // step3 onResume
        NightOwl.owlResume(this);
    }

}

Switch skin everywhere as you like,

View v = findViewById(R.id.button);
v.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        NightOwl.owlNewDress(SettingActivity.this);
    }
});