fix: fixes the appearance of Navigation Bar in the fullscreen mode

Author: AsCress

app/src/main/java/io/pslab/activity/LogicalAnalyzerActivity.java

@@ -1,7 +1,7 @@
 package io.pslab.activity;
 
+import android.annotation.SuppressLint;
 import android.content.Intent;
-import android.os.Build;
 import android.os.Bundle;
 import android.view.Menu;
 import android.view.MenuItem;
@@ -73,19 +73,36 @@ protected void onResume() {
     }
 
     private void removeStatusBar() {
-        if (Build.VERSION.SDK_INT < 16) {
-            getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
-                    WindowManager.LayoutParams.FLAG_FULLSCREEN);
-        } else {
-            View decorView = getWindow().getDecorView();
-
-            decorView.setSystemUiVisibility((View.SYSTEM_UI_FLAG_LAYOUT_STABLE
-                    | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
-                    | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
-                    | View.SYSTEM_UI_FLAG_FULLSCREEN
-                    | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
-                    | View.SYSTEM_UI_FLAG_FULLSCREEN
-                    | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY));
+        final int flags = View.SYSTEM_UI_FLAG_LAYOUT_STABLE
+                | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
+                | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
+                | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
+                | View.SYSTEM_UI_FLAG_FULLSCREEN
+                | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
+        getWindow().getDecorView().setSystemUiVisibility(flags);
+        final View decorView = getWindow().getDecorView();
+        decorView.setOnSystemUiVisibilityChangeListener(new View.OnSystemUiVisibilityChangeListener() {
+            @Override
+            public void onSystemUiVisibilityChange(int i) {
+                if ((i & View.SYSTEM_UI_FLAG_FULLSCREEN) == 0) {
+                    decorView.setSystemUiVisibility(flags);
+                }
+            }
+        });
+    }
+
+    @SuppressLint("NewApi")
+    @Override
+    public void onWindowFocusChanged(boolean hasFocus) {
+        super.onWindowFocusChanged(hasFocus);
+        if (hasFocus) {
+            getWindow().getDecorView().setSystemUiVisibility(
+                    View.SYSTEM_UI_FLAG_LAYOUT_STABLE
+                            | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
+                            | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
+                            | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
+                            | View.SYSTEM_UI_FLAG_FULLSCREEN
+                            | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
         }
     }
 

app/src/main/java/io/pslab/activity/OscilloscopeActivity.java

@@ -212,7 +212,22 @@ public OscilloscopeActivity() {
     protected void onCreate(@Nullable Bundle savedInstanceState) {
         requestWindowFeature(Window.FEATURE_NO_TITLE);
         super.onCreate(savedInstanceState);
-        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
+        final int flags = View.SYSTEM_UI_FLAG_LAYOUT_STABLE
+                | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
+                | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
+                | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
+                | View.SYSTEM_UI_FLAG_FULLSCREEN
+                | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
+        getWindow().getDecorView().setSystemUiVisibility(flags);
+        final View decorView = getWindow().getDecorView();
+        decorView.setOnSystemUiVisibilityChangeListener(new View.OnSystemUiVisibilityChangeListener() {
+            @Override
+            public void onSystemUiVisibilityChange(int i) {
+                if ((i & View.SYSTEM_UI_FLAG_FULLSCREEN) == 0) {
+                    decorView.setSystemUiVisibility(flags);
+                }
+            }
+        });
         ButterKnife.bind(this);
 
         removeStatusBar();
@@ -475,6 +490,21 @@ public void run() {
         }
     }
 
+    @SuppressLint("NewApi")
+    @Override
+    public void onWindowFocusChanged(boolean hasFocus) {
+        super.onWindowFocusChanged(hasFocus);
+        if (hasFocus) {
+            getWindow().getDecorView().setSystemUiVisibility(
+                    View.SYSTEM_UI_FLAG_LAYOUT_STABLE
+                            | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
+                            | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
+                            | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
+                            | View.SYSTEM_UI_FLAG_FULLSCREEN
+                            | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
+        }
+    }
+
     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
         getMenuInflater().inflate(R.menu.activity_landscape_menu, menu);