Support setting fullscreen UI and generating events for it

android-exoplayer/src/main/java/com/brentvatne/exoplayer/ReactExoplayerView.java

@@ -1,6 +1,7 @@
 package com.brentvatne.exoplayer;
 
 import android.annotation.SuppressLint;
+import android.app.Activity;
 import android.content.Context;
 import android.media.AudioManager;
 import android.net.Uri;
@@ -8,6 +9,8 @@ import android.os.Handler;
 import android.os.Message;
 import android.text.TextUtils;
 import android.util.Log;
+import android.view.View;
+import android.view.Window;
 import android.widget.FrameLayout;
 
 import com.brentvatne.react.R;
@@ -85,6 +88,7 @@ class ReactExoplayerView extends FrameLayout implements
     private int resumeWindow;
     private long resumePosition;
     private boolean loadVideoStarted;
+    private boolean isFullscreen;
     private boolean isPaused = true;
     private boolean isBuffering;
     private float rate = 1f;
@@ -331,6 +335,9 @@ class ReactExoplayerView extends FrameLayout implements
     }
 
     private void onStopPlayback() {
+        if (isFullscreen) {
+            setFullscreen(false);
+        }
         setKeepScreenOn(false);
         audioManager.abandonAudioFocus(this);
     }
@@ -638,4 +645,37 @@ class ReactExoplayerView extends FrameLayout implements
     public void setDisableFocus(boolean disableFocus) {
         this.disableFocus = disableFocus;
     }
+
+    public void setFullscreen(boolean fullscreen) {
+        if (fullscreen == isFullscreen) {
+            return; // Avoid generating events when nothing is changing
+        }
+        isFullscreen = fullscreen;
+
+        Activity activity = themedReactContext.getCurrentActivity();
+        if (activity == null) {
+            return;
+        }
+        Window window = activity.getWindow();
+        View decorView = window.getDecorView();
+        int uiOptions;
+        if (isFullscreen) {
+            if (Util.SDK_INT >= 19) { // 4.4+
+                uiOptions = SYSTEM_UI_FLAG_HIDE_NAVIGATION
+                        | SYSTEM_UI_FLAG_IMMERSIVE_STICKY
+                        | SYSTEM_UI_FLAG_FULLSCREEN;
+            } else {
+                uiOptions = SYSTEM_UI_FLAG_HIDE_NAVIGATION
+                        | SYSTEM_UI_FLAG_FULLSCREEN;
+            }
+            eventEmitter.fullscreenWillPresent();
+            decorView.setSystemUiVisibility(uiOptions);
+            eventEmitter.fullscreenDidPresent();
+        } else {
+            uiOptions = View.SYSTEM_UI_FLAG_VISIBLE;
+            eventEmitter.fullscreenWillDismiss();
+            decorView.setSystemUiVisibility(uiOptions);
+            eventEmitter.fullscreenDidDismiss();
+        }
+    }
 }