Deal with situations where the system UI is shown when the keyboard pops up (thanks Rachel!)

android-project/app/src/main/java/org/libsdl/app/SDLActivity.java

@@ -33,7 +33,7 @@ import android.content.pm.ApplicationInfo;
 /**
     SDL Activity
 */
-public class SDLActivity extends Activity {
+public class SDLActivity extends Activity implements View.OnSystemUiVisibilityChangeListener {
     private static final String TAG = "SDL";
 
     public static boolean mIsResumedCalled, mIsSurfaceReady, mHasFocus;
@@ -251,6 +251,8 @@ public class SDLActivity extends Activity {
 
         setWindowStyle(false);
 
+        getWindow().getDecorView().setOnSystemUiVisibilityChangeListener(this);
+
         // Get filename from "Open with" of another application
         Intent intent = getIntent();
         if (intent != null && intent.getData() != null) {
@@ -489,12 +491,14 @@ public class SDLActivity extends Activity {
                                         View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY |
                                         View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN |
                                         View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION |
-					View.SYSTEM_UI_FLAG_LAYOUT_STABLE;
+                    					View.SYSTEM_UI_FLAG_LAYOUT_STABLE | View.INVISIBLE;
                             window.getDecorView().setSystemUiVisibility(flags);        
                             window.addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
+                            window.clearFlags(WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN);
                         } else {
-                            int flags = View.SYSTEM_UI_FLAG_LAYOUT_STABLE;
-                            window.getDecorView().setSystemUiVisibility(flags);        
+                            int flags = View.SYSTEM_UI_FLAG_LAYOUT_STABLE | View.SYSTEM_UI_FLAG_VISIBLE;
+                            window.getDecorView().setSystemUiVisibility(flags);
+                            window.addFlags(WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN);
                             window.clearFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
                         }
                     }
@@ -1110,6 +1114,32 @@ public class SDLActivity extends Activity {
         return dialog;
     }
 
+    private final Runnable rehideSystemUi = new Runnable() {
+        @Override
+        public void run() {
+            int flags = View.SYSTEM_UI_FLAG_FULLSCREEN |
+                        View.SYSTEM_UI_FLAG_HIDE_NAVIGATION |
+                        View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY |
+                        View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN |
+                        View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION |
+                        View.SYSTEM_UI_FLAG_LAYOUT_STABLE | View.INVISIBLE;
+
+            SDLActivity.this.getWindow().getDecorView().setSystemUiVisibility(flags);
+        }
+    };
+
+    public void onSystemUiVisibilityChange(int visibility) {
+        if ((visibility & View.SYSTEM_UI_FLAG_FULLSCREEN) == 0 || (visibility & View.SYSTEM_UI_FLAG_HIDE_NAVIGATION) == 0) {
+
+            Handler handler = getWindow().getDecorView().getHandler();
+            if (handler != null) {
+                handler.removeCallbacks(rehideSystemUi); // Prevent a hide loop.
+                handler.postDelayed(rehideSystemUi, 2000);
+            }
+
+        }
+    }    
+
     /**
      * This method is called by SDL using JNI.
      */