Improve criteria for restoring fullscreen state on Android

* java/Makefile.in ($(CLASS_FILES) &): Touch all class files,
even those javac chose not to rebuild.

* java/org/gnu/emacs/EmacsActivity.java (onWindowFocusChanged):
Restore fullscreen state here.
(onResume): And not here.

2 files changed, 10 insertions, 3 deletions

diff --git a/java/Makefile.in b/java/Makefile.in
index 994ffdd0828..c7fe6e07c77 100644
--- a/java/Makefile.in
+++ b/java/Makefile.in
@@ -261,6 +261,7 @@ $(CLASS_FILES): $(RESOURCE_FILE)
 .SUFFIXES: .java .class
 $(CLASS_FILES) &: $(JAVA_FILES)
         $(AM_V_JAVAC) $(JAVAC) $(JAVAFLAGS) $(JAVA_FILES)
+        $(AM_V_SILENT) touch $(CLASS_FILES)
 
 # N.B. that find must be called all over again in case javac generated
 # nested classes.
diff --git a/java/org/gnu/emacs/EmacsActivity.java b/java/org/gnu/emacs/EmacsActivity.java
index c444110de60..bcfee3f7080 100644
--- a/java/org/gnu/emacs/EmacsActivity.java
+++ b/java/org/gnu/emacs/EmacsActivity.java
@@ -241,6 +241,15 @@ public class EmacsActivity extends Activity
       {
         focusedActivities.add (this);
         lastFocusedActivity = this;
+
+        /* Update the window insets as the focus change may have
+           changed the window insets as well, and the system does not
+           automatically restore visibility flags.  */
+
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN
+            && Build.VERSION.SDK_INT < Build.VERSION_CODES.R
+            && isFullscreen)
+          syncFullscreenWith (window);
       }
     else
       focusedActivities.remove (this);
@@ -264,9 +273,6 @@ public class EmacsActivity extends Activity
   {
     isPaused = false;
 
-    /* Update the window insets.  */
-    syncFullscreenWith (window);
-
     EmacsWindowAttachmentManager.MANAGER.noticeDeiconified (this);
     super.onResume ();
   }