WebViewActivity: improve integrated map's edge-to-edge

src/main/java/org/thoughtcrime/securesms/WebViewActivity.java

@@ -38,6 +38,9 @@ public class WebViewActivity extends PassphraseRequiredActionBarActivity
 
   protected WebView webView;
 
+  /** Return true the window content should display fullscreen/edge-to-edge ex. in the integrated maps app */
+  protected boolean immersiveMode() { return false; }
+
   protected boolean shouldAskToOpenLink() { return false; }
 
   protected void toggleFakeProxy(boolean enable) {
@@ -67,8 +70,13 @@ public class WebViewActivity extends PassphraseRequiredActionBarActivity
 
     webView = findViewById(R.id.webview);
 
-    // add padding to avoid content hidden behind system bars
-    ViewUtil.applyWindowInsets(findViewById(R.id.content_container));
+    if(immersiveMode()) {
+      // set a shadow in the status bar to make it more readable
+      findViewById(R.id.status_bar_background).setBackgroundResource(R.drawable.search_toolbar_shadow);
+    } else {
+      // add padding to avoid content hidden behind system bars
+      ViewUtil.applyWindowInsets(findViewById(R.id.content_container));
+    }
 
     webView.setWebViewClient(new WebViewClient() {
       // IMPORTANT: this is will likely not be called inside iframes unless target=_blank is used in the anchor/link tag.

src/main/java/org/thoughtcrime/securesms/WebxdcActivity.java

@@ -150,15 +150,18 @@ public class WebxdcActivity extends WebViewActivity implements DcEventCenter.DcE
       .getIntents();
   }
 
+  @Override
+  protected boolean immersiveMode() { return hideActionBar; }
+
   @Override
   protected void onCreate(Bundle state, boolean ready) {
+    Bundle b = getIntent().getExtras();
+    hideActionBar = b.getBoolean(EXTRA_HIDE_ACTION_BAR, false);
+
     super.onCreate(state, ready);
     rpc = DcHelper.getRpc(this);
     initTTS();
 
-    Bundle b = getIntent().getExtras();
-    hideActionBar = b.getBoolean(EXTRA_HIDE_ACTION_BAR, false);
-
     // enter fullscreen mode if necessary,
     // this is needed here because if the app is opened while already in landscape mode, onConfigurationChanged() is not triggered
     setScreenMode(getResources().getConfiguration());