ui: force dark theme in TV mode

Signed-off-by: Jason A. Donenfeld <[email protected]>

Author: zx2c4

ui/src/main/java/com/wireguard/android/activity/TvMainActivity.kt

@@ -21,7 +21,7 @@ import android.view.View
 import android.widget.Toast
 import androidx.activity.addCallback
 import androidx.activity.result.contract.ActivityResultContracts
-import androidx.appcompat.app.AppCompatActivity
+import androidx.appcompat.app.AppCompatDelegate
 import androidx.core.content.ContextCompat
 import androidx.core.content.getSystemService
 import androidx.core.view.forEach
@@ -47,13 +47,14 @@ import com.wireguard.android.model.ObservableTunnel
 import com.wireguard.android.util.ErrorMessages
 import com.wireguard.android.util.QuantityFormatter
 import com.wireguard.android.util.TunnelImporter
+import com.wireguard.android.util.UserKnobs
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 import java.io.File
 
-class TvMainActivity : AppCompatActivity() {
+class TvMainActivity : ThemeChangeAwareActivity() {
     private val tunnelFileImportResultLauncher = registerForActivityResult(object : ActivityResultContracts.GetContent() {
         override fun createIntent(context: Context, input: String): Intent {
             val intent = super.createIntent(context, input)
@@ -110,6 +111,16 @@ class TvMainActivity : AppCompatActivity() {
     private val filesRoot = ObservableField("")
 
     override fun onCreate(savedInstanceState: Bundle?) {
+        if (AppCompatDelegate.getDefaultNightMode() != AppCompatDelegate.MODE_NIGHT_YES) {
+            /* First set it this way to prevent a white flash. */
+            AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES)
+            if (Build.VERSION.SDK_INT < Build.VERSION_CODES.Q) {
+                /* Then update the preference, which triggers the recreation. */
+                lifecycleScope.launch {
+                    UserKnobs.setDarkTheme(true)
+                }
+            }
+        }
         super.onCreate(savedInstanceState)
         binding = TvActivityBinding.inflate(layoutInflater)
         lifecycleScope.launch {

ui/src/main/java/com/wireguard/android/util/UserKnobs.kt

@@ -41,6 +41,12 @@ object UserKnobs {
             it[DARK_THEME] ?: false
         }
 
+    suspend fun setDarkTheme(on: Boolean) {
+        Application.getPreferencesDataStore().edit {
+            it[DARK_THEME] = on
+        }
+    }
+
     private val ALLOW_REMOTE_CONTROL_INTENTS = booleanPreferencesKey("allow_remote_control_intents")
     val allowRemoteControlIntents: Flow<Boolean>
         get() = Application.getPreferencesDataStore().data.map {