feat: KSPlayer as an option for iOS + other improvements (#1266)

modules/mpv-player/android/src/main/AndroidManifest.xml

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+<manifest>
+</manifest>

modules/mpv-player/android/src/main/java/expo/modules/mpvplayer/MpvPlayerModule.kt

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+package expo.modules.mpvplayer
+
+import expo.modules.kotlin.modules.Module
+import expo.modules.kotlin.modules.ModuleDefinition
+import java.net.URL
+
+class MpvPlayerModule : Module() {
+  // Each module class must implement the definition function. The definition consists of components
+  // that describes the module's functionality and behavior.
+  // See https://docs.expo.dev/modules/module-api for more details about available components.
+  override fun definition() = ModuleDefinition {
+    // Sets the name of the module that JavaScript code will use to refer to the module. Takes a string as an argument.
+    // Can be inferred from module's class name, but it's recommended to set it explicitly for clarity.
+    // The module will be accessible from `requireNativeModule('MpvPlayer')` in JavaScript.
+    Name("MpvPlayer")
+
+    // Defines constant property on the module.
+    Constant("PI") {
+      Math.PI
+    }
+
+    // Defines event names that the module can send to JavaScript.
+    Events("onChange")
+
+    // Defines a JavaScript synchronous function that runs the native code on the JavaScript thread.
+    Function("hello") {
+      "Hello world! 👋"
+    }
+
+    // Defines a JavaScript function that always returns a Promise and whose native code
+    // is by default dispatched on the different thread than the JavaScript runtime runs on.
+    AsyncFunction("setValueAsync") { value: String ->
+      // Send an event to JavaScript.
+      sendEvent("onChange", mapOf(
+        "value" to value
+      ))
+    }
+
+    // Enables the module to be used as a native view. Definition components that are accepted as part of
+    // the view definition: Prop, Events.
+    View(MpvPlayerView::class) {
+      // Defines a setter for the `url` prop.
+      Prop("url") { view: MpvPlayerView, url: URL ->
+        view.webView.loadUrl(url.toString())
+      }
+      // Defines an event that the view can send to JavaScript.
+      Events("onLoad")
+    }
+  }
+}

modules/mpv-player/android/src/main/java/expo/modules/mpvplayer/MpvPlayerView.kt

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+package expo.modules.mpvplayer
+
+import android.content.Context
+import android.webkit.WebView
+import android.webkit.WebViewClient
+import expo.modules.kotlin.AppContext
+import expo.modules.kotlin.viewevent.EventDispatcher
+import expo.modules.kotlin.views.ExpoView
+
+class MpvPlayerView(context: Context, appContext: AppContext) : ExpoView(context, appContext) {
+  // Creates and initializes an event dispatcher for the `onLoad` event.
+  // The name of the event is inferred from the value and needs to match the event name defined in the module.
+  private val onLoad by EventDispatcher()
+
+  // Defines a WebView that will be used as the root subview.
+  internal val webView = WebView(context).apply {
+    layoutParams = LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT)
+    webViewClient = object : WebViewClient() {
+      override fun onPageFinished(view: WebView, url: String) {
+        // Sends an event to JavaScript. Triggers a callback defined on the view component in JavaScript.
+        onLoad(mapOf("url" to url))
+      }
+    }
+  }
+
+  init {
+    // Adds the WebView to the view hierarchy.
+    addView(webView)
+  }
+}