Add self camera preview to basic example app (#479)

* Self camera

* spotless

+/*
+ * Copyright 2024 LiveKit, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package io.livekit.android.sample.basic
 
 import android.Manifest
@@ -13,7 +29,9 @@ import io.livekit.android.LiveKit
 import io.livekit.android.events.RoomEvent
 import io.livekit.android.events.collect
 import io.livekit.android.renderer.SurfaceViewRenderer
+import io.livekit.android.renderer.TextureViewRenderer
 import io.livekit.android.room.Room
+import io.livekit.android.room.track.LocalVideoTrack
 import io.livekit.android.room.track.Track
 import io.livekit.android.room.track.VideoTrack
 import kotlinx.coroutines.launch
@@ -32,6 +50,7 @@ class MainActivity : AppCompatActivity() {
 
         // Setup the video renderer
         room.initVideoRenderer(findViewById<SurfaceViewRenderer>(R.id.renderer))
+        room.initVideoRenderer(findViewById<TextureViewRenderer>(R.id.local_camera))
 
         requestNeededPermissions { connectToRoom() }
     }
@@ -62,6 +81,12 @@ class MainActivity : AppCompatActivity() {
             localParticipant.setMicrophoneEnabled(true)
             localParticipant.setCameraEnabled(true)
 
+            // Attach local video camera
+            val localTrack = localParticipant.getTrackPublication(Track.Source.CAMERA)?.track as? LocalVideoTrack
+            if (localTrack != null) {
+                attachLocalVideo(localTrack)
+            }
+
             // Attach video of remote participant if already available.
             val remoteVideoTrack = room.remoteParticipants.values.firstOrNull()
                 ?.getTrackPublication(Track.Source.CAMERA)
@@ -85,6 +110,10 @@ class MainActivity : AppCompatActivity() {
         findViewById<View>(R.id.progress).visibility = View.GONE
     }
 
+    private fun attachLocalVideo(videoTrack: VideoTrack) {
+        videoTrack.addRenderer(findViewById<SurfaceViewRenderer>(R.id.local_camera))
+    }
+
     private fun requestNeededPermissions(onHasPermissions: () -> Unit) {
         val requestPermissionLauncher =
             registerForActivityResult(ActivityResultContracts.RequestMultiplePermissions()) { grants ->

@@ -10,6 +10,14 @@
         android:layout_width="match_parent"
         android:layout_height="match_parent" />
 
+
+    <io.livekit.android.renderer.TextureViewRenderer
+        android:id="@+id/local_camera"
+        android:layout_width="150dp"
+        android:layout_height="150dp"
+        android:layout_gravity="bottom|end"
+        android:layout_margin="10dp" />
+
     <ProgressBar
         android:id="@+id/progress"
         android:layout_width="wrap_content"