Add a message for default apps.

app/src/main/java/app/fedilab/nitterizeme/activities/DefaultAppActivity.java

@@ -19,6 +19,8 @@ import android.content.pm.PackageInfo;
 import android.database.sqlite.SQLiteDatabase;
 import android.os.Bundle;
 import android.view.MenuItem;
+import android.view.View;
+import android.widget.TextView;
 
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.recyclerview.widget.LinearLayoutManager;
@@ -58,6 +60,10 @@ public class DefaultAppActivity extends AppCompatActivity {
         ArrayList<DefaultApp> appInfos = getAppInfo();
         DefaultAppAdapter defaultAppAdapter = new DefaultAppAdapter(appInfos);
         list_apps.setAdapter(defaultAppAdapter);
+        if (appInfos.size() == 0) {
+            TextView no_apps = findViewById(R.id.no_apps);
+            no_apps.setVisibility(View.VISIBLE);
+        }
     }
 
 

app/src/main/java/app/fedilab/nitterizeme/adapters/DefaultAppAdapter.java

@@ -14,6 +14,7 @@ package app.fedilab.nitterizeme.adapters;
  * You should have received a copy of the GNU General Public License along with UntrackMe; if not,
  * see <http://www.gnu.org/licenses>. */
 
+import android.app.Activity;
 import android.content.Context;
 import android.content.res.Resources;
 import android.database.sqlite.SQLiteDatabase;
@@ -79,6 +80,12 @@ public class DefaultAppAdapter extends RecyclerView.Adapter {
                     new DefaultAppDAO(context, db).removeApp(app_package);
                     defaultApps.remove(defaultApp);
                     notifyItemRemoved(i);
+                    if (defaultApps.size() == 0) {
+                        TextView no_apps = ((Activity) context).findViewById(R.id.no_apps);
+                        if (no_apps != null) {
+                            no_apps.setVisibility(View.VISIBLE);
+                        }
+                    }
                     dialog.dismiss();
                 });
                 confirmDialog.setNegativeButton(R.string.cancel, (dialog, id) -> dialog.dismiss());

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

@@ -25,5 +25,13 @@
         android:id="@+id/list_apps"
         android:layout_width="match_parent"
         android:layout_height="wrap_content" />
-
+    <TextView
+        android:id="@+id/no_apps"
+        android:visibility="gone"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:gravity="center"
+        android:textSize="20sp"
+        android:text="@string/no_apps_set_as_default"
+        />
 </androidx.coordinatorlayout.widget.CoordinatorLayout>

app/src/main/res/values/strings.xml

@@ -76,4 +76,5 @@
     <string name="cancel">Cancel</string>
     <string name="delete_app_from_default">Delete %1$s from default apps?</string>
     <string name="copy_done">Copied</string>
+    <string name="no_apps_set_as_default">No apps set as default!</string>
 </resources>