feat(android) bump minimum required version to 26 aka Oreo

There is a 1.2% cummulative usage change according to [0] and it allows
us to simplify some code going forward.

[0]: https://apilevels.com/

android/build.gradle

     kotlinVersion = "1.9.24"
     buildToolsVersion = "34.0.0"
     compileSdkVersion = 34
-    minSdkVersion    = 24
+    minSdkVersion    = 26
     targetSdkVersion = 34
     supportLibVersion = "28.0.0"
     ndkVersion = "26.1.10909125"

android/sdk/src/main/java/org/jitsi/meet/sdk/AudioDeviceHandlerConnectionService.java

 
 import android.content.Context;
 import android.media.AudioManager;
-import android.os.Build;
 import android.telecom.CallAudioState;
 import androidx.annotation.RequiresApi;
 
  * {@link AudioModeModule.AudioDeviceHandlerInterface} module implementing device handling for
  * Android versions >= O when ConnectionService is enabled.
  */
-@RequiresApi(Build.VERSION_CODES.O)
 class AudioDeviceHandlerConnectionService implements
         AudioModeModule.AudioDeviceHandlerInterface,
         RNConnectionService.CallAudioStateListener {

android/sdk/src/main/java/org/jitsi/meet/sdk/AudioDeviceHandlerGeneric.java

 import android.media.AudioDeviceInfo;
 import android.media.AudioFocusRequest;
 import android.media.AudioManager;
-import android.os.Build;
 
 import java.util.HashSet;
 import java.util.Set;
         audioManager.setMode(AudioManager.MODE_IN_COMMUNICATION);
         audioManager.setMicrophoneMute(false);
 
-        int gotFocus;
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
-            gotFocus = audioManager.requestAudioFocus(new AudioFocusRequest.Builder(AudioManager.AUDIOFOCUS_GAIN)
-                .setAudioAttributes(
-                    new AudioAttributes.Builder()
-                        .setUsage(AudioAttributes.USAGE_VOICE_COMMUNICATION)
-                        .setContentType(AudioAttributes.CONTENT_TYPE_SPEECH)
-                        .build()
-                )
-                .setAcceptsDelayedFocusGain(true)
-                .setOnAudioFocusChangeListener(this)
-                .build()
-            );
-        } else {
-            gotFocus = audioManager.requestAudioFocus(this, AudioManager.STREAM_VOICE_CALL, AudioManager.AUDIOFOCUS_GAIN);
-        }
+        int gotFocus = audioManager.requestAudioFocus(new AudioFocusRequest.Builder(AudioManager.AUDIOFOCUS_GAIN)
+            .setAudioAttributes(
+                new AudioAttributes.Builder()
+                    .setUsage(AudioAttributes.USAGE_VOICE_COMMUNICATION)
+                    .setContentType(AudioAttributes.CONTENT_TYPE_SPEECH)
+                    .build()
+            )
+            .setAcceptsDelayedFocusGain(true)
+            .setOnAudioFocusChangeListener(this)
+            .build()
+        );
 
         if (gotFocus == AudioManager.AUDIOFOCUS_REQUEST_FAILED) {
             JitsiMeetLogger.w(TAG + " Audio focus request failed");

android/sdk/src/main/java/org/jitsi/meet/sdk/AudioModeModule.java

 import android.app.Activity;
 import android.content.Context;
 import android.media.AudioManager;
-import android.os.Build;
 
 import com.facebook.react.bridge.Arguments;
 import com.facebook.react.bridge.Promise;
  * Before a call has started and after it has ended the
  * {@code AudioModeModule.DEFAULT} mode should be used.
  */
-@SuppressLint("AnnotateVersionCheck")
 @ReactModule(name = AudioModeModule.NAME)
 class AudioModeModule extends ReactContextBaseJavaModule {
     public static final String NAME = "AudioMode";
     /**
      * Whether or not the ConnectionService is used for selecting audio devices.
      */
-    private static final boolean supportsConnectionService = Build.VERSION.SDK_INT >= Build.VERSION_CODES.O;
-    private static boolean useConnectionService_ = supportsConnectionService;
+    private static boolean useConnectionService_ = true;
 
     static boolean useConnectionService() {
-        return supportsConnectionService && useConnectionService_;
+        return useConnectionService_;
     }
 
     /**

android/sdk/src/main/java/org/jitsi/meet/sdk/ConnectionService.java

  *
  * @author Pawel Domas
  */
-@RequiresApi(api = Build.VERSION_CODES.O)
 public class ConnectionService extends android.telecom.ConnectionService {
 
     /**

android/sdk/src/main/java/org/jitsi/meet/sdk/JitsiMeetOngoingConferenceService.java

         ComponentName componentName;
 
         try {
-            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
-                componentName = context.startForegroundService(intent);
-            } else {
-                componentName = context.startService(intent);
-            }
+            componentName = context.startForegroundService(intent);
         } catch (RuntimeException e) {
             // Avoid crashing due to ForegroundServiceStartNotAllowedException (API level 31).
             // See: https://developer.android.com/guide/components/foreground-services#background-start-restrictions

android/sdk/src/main/java/org/jitsi/meet/sdk/OngoingNotification.java

 import androidx.annotation.StringRes;
 import androidx.core.app.NotificationCompat;
 
-import android.os.Build;
-
 
 /**
  * Helper class for creating the ongoing notification which is used with
     static final String ONGOING_CONFERENCE_CHANNEL_ID = "JitsiOngoingConferenceChannel";
 
     static void createNotificationChannel(Activity context) {
-        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.O) {
-            return;
-        }
-
         if (context == null) {
             JitsiMeetLogger.w(TAG + " Cannot create notification channel: no current context");
             return;

android/sdk/src/main/java/org/jitsi/meet/sdk/PictureInPictureModule.java

 import android.app.Activity;
 import android.app.ActivityManager;
 import android.app.PictureInPictureParams;
-import android.os.Build;
 import android.util.Rational;
 
 import com.facebook.react.bridge.Promise;
         // Android Go devices don't support PiP. There doesn't seem to be a better way to detect it than
         // to use ActivityManager.isLowRamDevice().
         // https://stackoverflow.com/questions/58340558/how-to-detect-android-go
-        isSupported = Build.VERSION.SDK_INT >= Build.VERSION_CODES.O && !am.isLowRamDevice();
+        isSupported = !am.isLowRamDevice();
     }
 
     /**
      * including when the activity is not visible (paused or stopped), if the
      * screen is locked or if the user has an activity pinned.
      */
-    @TargetApi(Build.VERSION_CODES.O)
     public void enterPictureInPicture() {
         if (!isEnabled) {
             return;

android/sdk/src/main/java/org/jitsi/meet/sdk/RNConnectionService.java

 import android.annotation.SuppressLint;
 import android.content.Context;
 import android.net.Uri;
-import android.os.Build;
 import android.os.Bundle;
 import android.telecom.DisconnectCause;
 import android.telecom.PhoneAccount;
  *
  * @author Pawel Domas
  */
-@RequiresApi(api = Build.VERSION_CODES.O)
 @ReactModule(name = RNConnectionService.NAME)
 class RNConnectionService extends ReactContextBaseJavaModule {
 
      * @param audioRoute the new audio route to be set. See
      * {@link android.telecom.CallAudioState} constants prefixed with "ROUTE_".
      */
-    @RequiresApi(api = Build.VERSION_CODES.O)
     static void setAudioRoute(int audioRoute) {
         for (ConnectionService.ConnectionImpl c
                 : ConnectionService.getConnections()) {

react-native-sdk/README.md

 
 ## Android
 
-- In your build.gradle have at least `minSdkVersion = 24`
+- In your build.gradle have at least `minSdkVersion = 26`
 - In `android/app/src/debug/AndroidManifest.xml` and `android/app/src/main/AndroidManifest.xml`, under the `</application>` tag, include
   ```xml
     <uses-permission android:name="android.permission.RECORD_AUDIO" />