Show error panel in EmptyFragment

app/src/main/java/org/schabi/newpipe/error/ErrorPanelHelper.kt

@@ -35,7 +35,7 @@ import java.util.concurrent.TimeUnit
 class ErrorPanelHelper(
     private val fragment: Fragment,
     rootView: View,
-    onRetry: Runnable
+    onRetry: Runnable?,
 ) {
     private val context: Context = rootView.context!!
 
@@ -56,13 +56,16 @@ class ErrorPanelHelper(
         errorPanelRoot.findViewById(R.id.error_open_in_browser)
 
     private var errorDisposable: Disposable? = null
+    private var retryShouldBeShown: Boolean = (onRetry != null)
 
     init {
+        if (onRetry != null) {
             errorDisposable = errorRetryButton.clicks()
                 .debounce(300, TimeUnit.MILLISECONDS)
                 .observeOn(AndroidSchedulers.mainThread())
                 .subscribe { onRetry.run() }
         }
+    }
 
     private fun ensureDefaultVisibility() {
         errorTextView.isVisible = true
@@ -101,7 +104,7 @@ class ErrorPanelHelper(
                 errorActionButton.setOnClickListener(null)
             }
 
-            errorRetryButton.isVisible = true
+            errorRetryButton.isVisible = retryShouldBeShown
             showAndSetOpenInBrowserButtonAction(errorInfo)
         } else if (errorInfo.throwable is AccountTerminatedException) {
             errorTextView.setText(R.string.account_terminated)
@@ -130,7 +133,7 @@ class ErrorPanelHelper(
                 errorInfo.throwable !is ContentNotSupportedException
             ) {
                 // show retry button only for content which is not unavailable or unsupported
-                errorRetryButton.isVisible = true
+                errorRetryButton.isVisible = retryShouldBeShown
             }
             showAndSetOpenInBrowserButtonAction(errorInfo)
         }

app/src/main/java/org/schabi/newpipe/error/UserAction.java

@@ -32,7 +32,8 @@ public enum UserAction {
     PREFERENCES_MIGRATION("migration of preferences"),
     SHARE_TO_NEWPIPE("share to newpipe"),
     CHECK_FOR_NEW_APP_VERSION("check for new app version"),
-    OPEN_INFO_ITEM_DIALOG("open info item dialog");
+    OPEN_INFO_ITEM_DIALOG("open info item dialog"),
+    GETTING_MAIN_SCREEN_TAB("getting main screen tab");
 
     private final String message;
 

app/src/main/java/org/schabi/newpipe/fragments/BlankFragment.java

@@ -9,14 +9,52 @@ import androidx.annotation.Nullable;
 
 import org.schabi.newpipe.BaseFragment;
 import org.schabi.newpipe.R;
+import org.schabi.newpipe.error.ErrorInfo;
+import org.schabi.newpipe.error.ErrorPanelHelper;
 
 public class BlankFragment extends BaseFragment {
+
+    @Nullable
+    final ErrorInfo errorInfo;
+    @Nullable
+    ErrorPanelHelper errorPanel = null;
+
+    /**
+     * Builds a blank fragment that just says the app name and suggests clicking on search.
+     */
+    public BlankFragment() {
+        this(null);
+    }
+
+    /**
+     * @param errorInfo if null acts like {@link BlankFragment}, else shows an error panel.
+     */
+    public BlankFragment(@Nullable final ErrorInfo errorInfo) {
+        this.errorInfo = errorInfo;
+    }
+
     @Nullable
     @Override
     public View onCreateView(final LayoutInflater inflater, @Nullable final ViewGroup container,
                              final Bundle savedInstanceState) {
         setTitle("NewPipe");
-        return inflater.inflate(R.layout.fragment_blank, container, false);
+        final View view = inflater.inflate(R.layout.fragment_blank, container, false);
+        if (errorInfo != null) {
+            errorPanel = new ErrorPanelHelper(this, view, null);
+            errorPanel.showError(errorInfo);
+            view.findViewById(R.id.blank_page_content).setVisibility(View.GONE);
+        }
+        return view;
+    }
+
+    @Override
+    public void onDestroyView() {
+        super.onDestroyView();
+
+        if (errorPanel != null) {
+            errorPanel.dispose();
+            errorPanel = null;
+        }
     }
 
     @Override

app/src/main/java/org/schabi/newpipe/fragments/MainFragment.java

@@ -36,7 +36,9 @@ import com.google.android.material.tabs.TabLayout;
 import org.schabi.newpipe.BaseFragment;
 import org.schabi.newpipe.R;
 import org.schabi.newpipe.databinding.FragmentMainBinding;
+import org.schabi.newpipe.error.ErrorInfo;
 import org.schabi.newpipe.error.ErrorUtil;
+import org.schabi.newpipe.error.UserAction;
 import org.schabi.newpipe.local.playlist.LocalPlaylistFragment;
 import org.schabi.newpipe.settings.tabs.Tab;
 import org.schabi.newpipe.settings.tabs.TabsManager;
@@ -302,10 +304,9 @@ public class MainFragment extends BaseFragment implements TabLayout.OnTabSelecte
             final Fragment fragment;
             try {
                 fragment = tab.getFragment(context);
-            } catch (final Exception e) {
+            } catch (final Throwable t) {
-                ErrorUtil.showUiErrorSnackbar(context, "Getting fragment item", e);
+                return new BlankFragment(new ErrorInfo(t, UserAction.GETTING_MAIN_SCREEN_TAB,
-                // TODO: show an error fragment instead
+                        "Tab " + tab.getClass().getSimpleName() + ":" + tab.getTabName(context)));
-                return new BlankFragment();
             }
 
             if (fragment instanceof BaseFragment) {

app/src/main/res/layout/fragment_blank.xml

@@ -4,7 +4,9 @@
     android:layout_width="match_parent"
     android:layout_height="match_parent">
 
-    <include layout="@layout/main_bg" />
+    <include
+        android:id="@+id/blank_page_content"
+        layout="@layout/main_bg" />
 
     <include
         android:id="@+id/error_panel"