Add margins to toolbar

Author: smdyv

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

@@ -13,6 +13,7 @@
 import android.view.MenuInflater;
 import android.view.MenuItem;
 import android.view.View;
+import android.view.ViewGroup;
 import android.webkit.CookieManager;
 import android.webkit.JavascriptInterface;
 import android.webkit.WebResourceRequest;
@@ -25,6 +26,9 @@
 
 import androidx.annotation.NonNull;
 import androidx.appcompat.app.AppCompatActivity;
+import androidx.core.graphics.Insets;
+import androidx.core.view.ViewCompat;
+import androidx.core.view.WindowInsetsCompat;
 import androidx.loader.app.LoaderManager;
 import androidx.loader.content.Loader;
 
@@ -153,6 +157,17 @@ protected void onCreate(Bundle savedInstanceState) {
         setContentView(binding.getRoot());
         setSupportActionBar(binding.toolbar);
 
+        // Margins for the toolbar are needed, so that content of the toolbar
+        // is not covered by a system button navigation bar when in landscape.
+        ViewCompat.setOnApplyWindowInsetsListener(binding.toolbar, (v, windowInsets) -> {
+            Insets insets = windowInsets.getInsets(WindowInsetsCompat.Type.systemBars());
+            ViewGroup.MarginLayoutParams mlp = (ViewGroup.MarginLayoutParams) v.getLayoutParams();
+            mlp.leftMargin = insets.left;
+            mlp.rightMargin = insets.right;
+            v.setLayoutParams(mlp);
+            return windowInsets;
+        });
+
         binding.webview.setBackgroundColor(Color.TRANSPARENT);
 
         if (BuildConfig.DEBUG) {