Convert download code to kotlin (#3665)

app/src/main/java/fr/free/nrw/commons/media/MediaDetailPagerFragment.java

@@ -1,11 +1,11 @@
 package fr.free.nrw.commons.media;
 
+import static fr.free.nrw.commons.Utils.handleWebUrl;
+
 import android.annotation.SuppressLint;
-import android.app.DownloadManager;
 import android.content.Intent;
 import android.net.Uri;
 import android.os.Bundle;
-import android.os.Environment;
 import android.os.Handler;
 import android.view.LayoutInflater;
 import android.view.Menu;
@@ -13,40 +13,31 @@ import android.view.MenuInflater;
 import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewGroup;
-import android.widget.Toast;
-
 import androidx.fragment.app.Fragment;
 import androidx.fragment.app.FragmentManager;
 import androidx.fragment.app.FragmentStatePagerAdapter;
 import androidx.viewpager.widget.ViewPager;
-
-import com.google.android.material.snackbar.Snackbar;
-
-import javax.inject.Inject;
-import javax.inject.Named;
-
 import butterknife.BindView;
 import butterknife.ButterKnife;
+import com.google.android.material.snackbar.Snackbar;
 import fr.free.nrw.commons.Media;
 import fr.free.nrw.commons.R;
-import fr.free.nrw.commons.category.CategoryImagesCallback;
 import fr.free.nrw.commons.auth.SessionManager;
 import fr.free.nrw.commons.bookmarks.Bookmark;
 import fr.free.nrw.commons.bookmarks.pictures.BookmarkPicturesContentProvider;
 import fr.free.nrw.commons.bookmarks.pictures.BookmarkPicturesDao;
+import fr.free.nrw.commons.category.CategoryImagesCallback;
 import fr.free.nrw.commons.contributions.Contribution;
 import fr.free.nrw.commons.di.CommonsDaggerSupportFragment;
 import fr.free.nrw.commons.kvstore.JsonKvStore;
+import fr.free.nrw.commons.utils.DownloadUtils;
 import fr.free.nrw.commons.utils.ImageUtils;
 import fr.free.nrw.commons.utils.NetworkUtils;
-import fr.free.nrw.commons.utils.PermissionUtils;
 import fr.free.nrw.commons.utils.ViewUtil;
+import javax.inject.Inject;
+import javax.inject.Named;
 import timber.log.Timber;
 
-import static android.Manifest.permission.WRITE_EXTERNAL_STORAGE;
-import static android.content.Context.DOWNLOAD_SERVICE;
-import static fr.free.nrw.commons.Utils.handleWebUrl;
-
 public class MediaDetailPagerFragment extends CommonsDaggerSupportFragment implements ViewPager.OnPageChangeListener {
 
     @Inject SessionManager sessionManager;
@@ -168,7 +159,7 @@ public class MediaDetailPagerFragment extends CommonsDaggerSupportFragment imple
                     ViewUtil.showShortSnackbar(getView(), R.string.no_internet);
                     return false;
                 }
-                downloadMedia(m);
+                DownloadUtils.downloadMedia(getActivity(), m);
                 return true;
             case R.id.menu_set_as_wallpaper:
                 // Set wallpaper
@@ -192,53 +183,6 @@ public class MediaDetailPagerFragment extends CommonsDaggerSupportFragment imple
         ImageUtils.setWallpaperFromImageUrl(getActivity(), Uri.parse(media.getImageUrl()));
     }
 
-    /**
-     * Start the media file downloading to the local SD card/storage.
-     * The file can then be opened in Gallery or other apps.
-     *
-     * @param m Media file to download
-     */
-    private void downloadMedia(Media m) {
-        String imageUrl = m.getImageUrl(), fileName = m.getFilename();
-
-        if (imageUrl == null
-                || fileName == null
-                || getContext() ==  null
-                || getActivity() == null) {
-            Timber.d("Skipping download media as either imageUrl %s or filename %s activity is null", imageUrl, fileName);
-            return;
-        }
-
-        // Strip 'File:' from beginning of filename, we really shouldn't store it
-        fileName = fileName.replaceFirst("^File:", "");
-
-        Uri imageUri = Uri.parse(imageUrl);
-
-        DownloadManager.Request req = new DownloadManager.Request(imageUri);
-        //These are not the image title and description fields, they are download descs for notifications
-        req.setDescription(getString(R.string.app_name));
-        req.setTitle(m.getDisplayTitle());
-        req.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, fileName);
-
-        // Modern Android updates the gallery automatically. Yay!
-        req.allowScanningByMediaScanner();
-        req.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
-        PermissionUtils.checkPermissionsAndPerformAction(getActivity(), WRITE_EXTERNAL_STORAGE,
-            () -> enqueueRequest(req), () -> Toast.makeText(getContext(),
-                R.string.download_failed_we_cannot_download_the_file_without_storage_permission,
-                Toast.LENGTH_SHORT).show(), R.string.storage_permission,
-            R.string.write_storage_permission_rationale);
-
-    }
-
-    private void enqueueRequest(DownloadManager.Request req) {
-        DownloadManager systemService =
-            (DownloadManager) getActivity().getSystemService(DOWNLOAD_SERVICE);
-        if (systemService != null) {
-            systemService.enqueue(req);
-        }
-    }
-
     @Override
     public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
         if (!editable) { // Disable menu options for editable views

app/src/main/java/fr/free/nrw/commons/utils/DownloadUtils.kt

@@ -0,0 +1,65 @@
+package fr.free.nrw.commons.utils
+
+import android.Manifest.permission
+import android.app.Activity
+import android.app.DownloadManager
+import android.content.Context
+import android.net.Uri
+import android.os.Environment
+import android.widget.Toast
+import fr.free.nrw.commons.Media
+import fr.free.nrw.commons.R
+import timber.log.Timber
+
+object DownloadUtils {
+    /**
+     * Start the media file downloading to the local SD card/storage. The file can then be opened in
+     * Gallery or other apps.
+     *
+     * @param m Media file to download
+     */
+    @JvmStatic
+    fun downloadMedia(activity: Activity?, m: Media) {
+        val imageUrl = m.getImageUrl()
+        var fileName = m.getFilename()
+        if (imageUrl == null || fileName == null || activity == null
+        ) {
+            Timber.d(
+                "Skipping download media as either imageUrl %s or filename %s activity is null",
+                imageUrl, fileName
+            )
+            return
+        }
+        // Strip 'File:' from beginning of filename, we really shouldn't store it
+        fileName = fileName.replaceFirst("^File:".toRegex(), "")
+        val imageUri = Uri.parse(imageUrl)
+        val req = DownloadManager.Request(imageUri)
+        //These are not the image title and description fields, they are download descs for notifications
+        req.setDescription(activity.getString(R.string.app_name))
+        req.setTitle(m.displayTitle)
+        req.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, fileName)
+        // Modern Android updates the gallery automatically. Yay!
+        req.allowScanningByMediaScanner()
+        req.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED)
+        PermissionUtils.checkPermissionsAndPerformAction(
+            activity,
+            permission.WRITE_EXTERNAL_STORAGE,
+            { enqueueRequest(activity, req) },
+            {
+                Toast.makeText(
+                    activity,
+                    R.string.download_failed_we_cannot_download_the_file_without_storage_permission,
+                    Toast.LENGTH_SHORT
+                ).show()
+            },
+            R.string.storage_permission,
+            R.string.write_storage_permission_rationale
+        )
+    }
+
+    private fun enqueueRequest(activity: Activity, req: DownloadManager.Request) {
+        val systemService =
+            activity.getSystemService(Context.DOWNLOAD_SERVICE) as DownloadManager
+        systemService?.enqueue(req)
+    }
+}