Updater: Unbreak "Export update" feature

Fixes: https://gitlab.com/LineageOS/issues/android/-/issues/4736
Change-Id: I186a27d2e99098cf8ebb3dd5c7348cdb528baa78

src/org/lineageos/updater/UpdatesActivity.java

@@ -16,6 +16,7 @@
 package org.lineageos.updater;
 
 import android.annotation.SuppressLint;
+import android.app.Activity;
 import android.app.UiModeManager;
 import android.content.BroadcastReceiver;
 import android.content.ComponentName;
@@ -44,6 +45,8 @@ import android.widget.Spinner;
 import android.widget.TextView;
 import android.widget.Toast;
 
+import androidx.activity.result.ActivityResultLauncher;
+import androidx.activity.result.contract.ActivityResultContracts;
 import androidx.appcompat.app.ActionBar;
 import androidx.appcompat.app.AlertDialog;
 import androidx.appcompat.widget.SwitchCompat;
@@ -87,6 +90,19 @@ public class UpdatesActivity extends UpdatesListActivity {
 
     private boolean mIsTV;
 
+    private UpdateInfo mToBeExported = null;
+    private final ActivityResultLauncher<Intent> mExportUpdate = registerForActivityResult(
+            new ActivityResultContracts.StartActivityForResult(),
+            result -> {
+                if (result.getResultCode() == Activity.RESULT_OK) {
+                    Intent intent = result.getData();
+                    if (intent != null) {
+                        Uri uri = intent.getData();
+                        exportUpdate(uri);
+                    }
+                }
+            });
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -402,6 +418,26 @@ public class UpdatesActivity extends UpdatesListActivity {
         }
     }
 
+    @Override
+    public void exportUpdate(UpdateInfo update) {
+        mToBeExported = update;
+
+        Intent intent = new Intent(Intent.ACTION_CREATE_DOCUMENT);
+        intent.addCategory(Intent.CATEGORY_OPENABLE);
+        intent.setType("application/zip");
+        intent.putExtra(Intent.EXTRA_TITLE, update.getName());
+
+        mExportUpdate.launch(intent);
+    }
+
+    private void exportUpdate(Uri uri) {
+        Intent intent = new Intent(this, ExportUpdateService.class);
+        intent.setAction(ExportUpdateService.ACTION_START_EXPORTING);
+        intent.putExtra(ExportUpdateService.EXTRA_SOURCE_FILE, mToBeExported.getFile());
+        intent.putExtra(ExportUpdateService.EXTRA_DEST_URI, uri);
+        startService(intent);
+    }
+
     @Override
     public void showSnackbar(int stringId, int duration) {
         Snackbar.make(findViewById(R.id.main_container), stringId, duration).show();

src/org/lineageos/updater/UpdatesListActivity.java

@@ -17,6 +17,9 @@ package org.lineageos.updater;
 
 import androidx.appcompat.app.AppCompatActivity;
 
+import org.lineageos.updater.model.UpdateInfo;
+
 public abstract class UpdatesListActivity extends AppCompatActivity {
+    public abstract void exportUpdate(UpdateInfo update);
     public abstract void showSnackbar(int stringId, int duration);
 }

src/org/lineageos/updater/UpdatesListAdapter.java

@@ -84,8 +84,6 @@ public class UpdatesListAdapter extends RecyclerView.Adapter<UpdatesListAdapter.
 
     private AlertDialog infoDialog;
 
-    private UpdateInfo mToBeExported = null;
-
     private enum Action {
         DOWNLOAD,
         PAUSE,
@@ -549,7 +547,9 @@ public class UpdatesListAdapter extends RecyclerView.Adapter<UpdatesListAdapter.
                         mActivity.getString(R.string.toast_download_url_copied));
                 return true;
             } else if (itemId == R.id.menu_export_update) {
-                exportUpdate(update);
+                if (mActivity != null) {
+                    mActivity.exportUpdate(update);
+                }
                 return true;
             }
             return false;
@@ -559,39 +559,6 @@ public class UpdatesListAdapter extends RecyclerView.Adapter<UpdatesListAdapter.
         helper.show();
     }
 
-    private void exportUpdate(UpdateInfo update) {
-        if (mActivity == null) {
-            return;
-        }
-        mToBeExported = update;
-        ActivityResultLauncher<Intent> resultLauncher = mActivity.registerForActivityResult(
-                new ActivityResultContracts.StartActivityForResult(),
-                result -> {
-                    if (result.getResultCode() == Activity.RESULT_OK) {
-                        Intent intent = result.getData();
-                        if (intent != null) {
-                            Uri uri = intent.getData();
-                            exportUpdate(uri);
-                        }
-                    }
-                });
-
-        Intent intent = new Intent(Intent.ACTION_CREATE_DOCUMENT);
-        intent.addCategory(Intent.CATEGORY_OPENABLE);
-        intent.setType("application/zip");
-        intent.putExtra(Intent.EXTRA_TITLE, update.getName());
-
-        resultLauncher.launch(intent);
-    }
-
-    private void exportUpdate(Uri uri) {
-        Intent intent = new Intent(mActivity, ExportUpdateService.class);
-        intent.setAction(ExportUpdateService.ACTION_START_EXPORTING);
-        intent.putExtra(ExportUpdateService.EXTRA_SOURCE_FILE, mToBeExported.getFile());
-        intent.putExtra(ExportUpdateService.EXTRA_DEST_URI, uri);
-        mActivity.startService(intent);
-    }
-
     private void showInfoDialog() {
         String messageString = String.format(StringGenerator.getCurrentLocale(mActivity),
                 mActivity.getString(R.string.blocked_update_dialog_message),