replace deprecated api uses

Author: empratyush

app/src/main/java/app/grapheneos/pdfviewer/PdfViewer.java

@@ -44,6 +44,7 @@
 import app.grapheneos.pdfviewer.fragment.DocumentPropertiesFragment;
 import app.grapheneos.pdfviewer.fragment.PasswordPromptFragment;
 import app.grapheneos.pdfviewer.fragment.JumpToPageFragment;
+import app.grapheneos.pdfviewer.ktx.ViewKt;
 import app.grapheneos.pdfviewer.loader.DocumentPropertiesLoader;
 import app.grapheneos.pdfviewer.viewModel.PasswordStatus;
 
@@ -331,8 +332,7 @@ public boolean onTapUp() {
                         if (mUri != null) {
                             binding.webview.evaluateJavascript("isTextSelected()", selection -> {
                                 if (!Boolean.parseBoolean(selection)) {
-                                    if ((getWindow().getDecorView().getSystemUiVisibility() &
-                                            View.SYSTEM_UI_FLAG_FULLSCREEN) == 0) {
+                                    if (getSupportActionBar().isShowing()) {
                                         hideSystemUi();
                                     } else {
                                         showSystemUi();
@@ -569,21 +569,12 @@ public void onJumpToPageInDocument(final int selected_page) {
     }
 
     private void showSystemUi() {
-        getWindow().getDecorView().setSystemUiVisibility(
-                View.SYSTEM_UI_FLAG_LAYOUT_STABLE |
-                View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION |
-                View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
+        ViewKt.showSystemUi(binding.getRoot());
         getSupportActionBar().show();
     }
 
     private void hideSystemUi() {
-        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);
+        ViewKt.hideSystemUi(binding.getRoot());
         getSupportActionBar().hide();
     }
 

app/src/main/java/app/grapheneos/pdfviewer/ktx/View.kt

@@ -0,0 +1,19 @@
+package app.grapheneos.pdfviewer.ktx
+
+import android.view.View
+import androidx.core.view.ViewCompat
+import androidx.core.view.WindowInsetsCompat
+import androidx.core.view.WindowInsetsControllerCompat
+
+private val systemBars = WindowInsetsCompat.Type.statusBars()
+
+fun View.hideSystemUi() {
+    val controller = ViewCompat.getWindowInsetsController(this) ?: return
+    controller.systemBarsBehavior =
+        WindowInsetsControllerCompat.BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE
+    controller.hide(systemBars)
+}
+
+fun View.showSystemUi() {
+    ViewCompat.getWindowInsetsController(this)?.show(systemBars)
+}