Android: let fullscreen use entire screen

API level 19 (Android 4.4) introduces "immersive" mode which lets
the app use the entire screen.

Change-Id: I12f6aebaf1303cdc5b6bfb51944e895351fa2406
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/src/android/jar/src/org/qtproject/qt5/android/QtActivityDelegate.java b/src/android/jar/src/org/qtproject/qt5/android/QtActivityDelegate.java
index 6198baeedc..07b517d3d0 100644
--- a/src/android/jar/src/org/qtproject/qt5/android/QtActivityDelegate.java
+++ b/src/android/jar/src/org/qtproject/qt5/android/QtActivityDelegate.java
@@ -139,9 +139,41 @@ public class QtActivityDelegate
         if (m_fullScreen = enterFullScreen) {
             m_activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
             m_activity.getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN);
+            if (Build.VERSION.SDK_INT >= 19) {
+                try {
+                    int ui_flag_immersive_sticky = View.class.getDeclaredField("SYSTEM_UI_FLAG_IMMERSIVE_STICKY").getInt(null);
+                    int ui_flag_layout_stable = View.class.getDeclaredField("SYSTEM_UI_FLAG_LAYOUT_STABLE").getInt(null);
+                    int ui_flag_layout_hide_navigation = View.class.getDeclaredField("SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION").getInt(null);
+                    int ui_flag_layout_fullscreen = View.class.getDeclaredField("SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN").getInt(null);
+                    int ui_flag_hide_navigation = View.class.getDeclaredField("SYSTEM_UI_FLAG_HIDE_NAVIGATION").getInt(null);
+                    int ui_flag_fullscreen = View.class.getDeclaredField("SYSTEM_UI_FLAG_FULLSCREEN").getInt(null);
+
+                    Method m = View.class.getMethod("setSystemUiVisibility", int.class);
+                    m.invoke(m_activity.getWindow().getDecorView(),
+                             ui_flag_layout_stable
+                             | ui_flag_layout_hide_navigation
+                             | ui_flag_layout_fullscreen
+                             | ui_flag_hide_navigation
+                             | ui_flag_fullscreen
+                             | ui_flag_immersive_sticky
+                             | View.INVISIBLE);
+                } catch (Exception e) {
+                    e.printStackTrace();
+                }
+            }
         } else {
             m_activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN);
             m_activity.getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
+            if (Build.VERSION.SDK_INT >= 19) {
+                try {
+                    int ui_flag_visible = View.class.getDeclaredField("SYSTEM_UI_FLAG_VISIBLE").getInt(null);
+                    Method m = View.class.getMethod("setSystemUiVisibility", int.class);
+                    m.invoke(m_activity.getWindow().getDecorView(),
+                             ui_flag_visible);
+                } catch (Exception e) {
+                    e.printStackTrace();
+                }
+            }
         }
     }
 
@@ -696,6 +728,12 @@ public class QtActivityDelegate
                 QtNative.updateApplicationState(ApplicationActive);
                 QtNative.clearLostActions();
                 QtNative.updateWindow();
+
+                if (m_fullScreen) {
+                    // Suspending the app clears the immersive mode, so we need to set it again.
+                    m_fullScreen = false; // Force the setFullScreen() call below to actually do something
+                    setFullScreen(true);
+                }
             }
         }
     }