feat: show download button only if there are music files in the current directory fragment

app/src/main/java/com/cappielloantonio/tempo/ui/dialog/DownloadDirectoryDialog.java

@@ -0,0 +1,71 @@
+package com.cappielloantonio.tempo.ui.dialog;
+
+import android.app.AlertDialog;
+import android.app.Dialog;
+import android.os.Bundle;
+import android.widget.Button;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.OptIn;
+import androidx.fragment.app.DialogFragment;
+import androidx.media3.common.util.UnstableApi;
+
+import com.cappielloantonio.tempo.R;
+import com.cappielloantonio.tempo.databinding.DialogDownloadDirectoryBinding;
+import com.cappielloantonio.tempo.interfaces.DialogClickCallback;
+
+@OptIn(markerClass = UnstableApi.class)
+public class DownloadDirectoryDialog extends DialogFragment {
+    private DialogDownloadDirectoryBinding bind;
+
+    private final DialogClickCallback dialogClickCallback;
+
+    public DownloadDirectoryDialog(DialogClickCallback dialogClickCallback) {
+        this.dialogClickCallback = dialogClickCallback;
+    }
+
+    @NonNull
+    @Override
+    public Dialog onCreateDialog(Bundle savedInstanceState) {
+        bind = DialogDownloadDirectoryBinding.inflate(getLayoutInflater());
+
+        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
+
+        builder.setView(bind.getRoot())
+                .setTitle(R.string.download_directory_dialog_title)
+                .setPositiveButton(R.string.download_directory_dialog_positive_button, null)
+                .setNegativeButton(R.string.download_directory_dialog_negative_button, null);
+
+        return builder.create();
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        setButtonAction();
+    }
+
+    @Override
+    public void onDestroyView() {
+        super.onDestroyView();
+        bind = null;
+    }
+
+    private void setButtonAction() {
+        AlertDialog dialog = ((AlertDialog) getDialog());
+
+        if (dialog != null) {
+            Button positiveButton = dialog.getButton(Dialog.BUTTON_POSITIVE);
+            positiveButton.setOnClickListener(v -> {
+                dialogClickCallback.onPositiveClick();
+                dialog.dismiss();
+            });
+
+            Button negativeButton = dialog.getButton(Dialog.BUTTON_NEGATIVE);
+            negativeButton.setOnClickListener(v -> {
+                dialogClickCallback.onNegativeClick();
+                dialog.dismiss();
+            });
+        }
+    }
+}

app/src/main/java/com/cappielloantonio/tempo/ui/fragment/DirectoryFragment.java

@@ -23,12 +23,14 @@ import androidx.recyclerview.widget.LinearLayoutManager;
 import com.cappielloantonio.tempo.R;
 import com.cappielloantonio.tempo.databinding.FragmentDirectoryBinding;
 import com.cappielloantonio.tempo.interfaces.ClickCallback;
+import com.cappielloantonio.tempo.interfaces.DialogClickCallback;
 import com.cappielloantonio.tempo.model.Download;
 import com.cappielloantonio.tempo.service.MediaManager;
 import com.cappielloantonio.tempo.service.MediaService;
 import com.cappielloantonio.tempo.subsonic.models.Child;
 import com.cappielloantonio.tempo.ui.activity.MainActivity;
 import com.cappielloantonio.tempo.ui.adapter.MusicDirectoryAdapter;
+import com.cappielloantonio.tempo.ui.dialog.DownloadDirectoryDialog;
 import com.cappielloantonio.tempo.util.Constants;
 import com.cappielloantonio.tempo.util.DownloadUtil;
 import com.cappielloantonio.tempo.util.MappingUtil;
@@ -50,6 +52,8 @@ public class DirectoryFragment extends Fragment implements ClickCallback {
 
     private ListenableFuture<MediaBrowser> mediaBrowserListenableFuture;
 
+    private MenuItem menuItem;
+
     @Override
     public void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -60,6 +64,8 @@ public class DirectoryFragment extends Fragment implements ClickCallback {
     public void onCreateOptionsMenu(@NonNull Menu menu, @NonNull MenuInflater inflater) {
         super.onCreateOptionsMenu(menu, inflater);
         inflater.inflate(R.menu.directory_page_menu, menu);
+
+        menuItem = menu.getItem(0);
     }
 
     @Override
@@ -97,15 +103,23 @@ public class DirectoryFragment extends Fragment implements ClickCallback {
     @Override
     public boolean onOptionsItemSelected(@NonNull MenuItem item) {
         if (item.getItemId() == R.id.action_download_directory) {
-            directoryViewModel.loadMusicDirectory(getArguments().getString(Constants.MUSIC_DIRECTORY_ID)).observe(getViewLifecycleOwner(), directory -> {
+            DownloadDirectoryDialog dialog = new DownloadDirectoryDialog(new DialogClickCallback() {
-                if (isVisible() && getActivity() != null) {
+                @Override
-                    List<Child> songs = directory.getChildren().stream().filter(child -> !child.isDir()).collect(Collectors.toList());
+                public void onPositiveClick() {
-                    DownloadUtil.getDownloadTracker(requireContext()).download(
+                    directoryViewModel.loadMusicDirectory(getArguments().getString(Constants.MUSIC_DIRECTORY_ID)).observe(getViewLifecycleOwner(), directory -> {
-                            MappingUtil.mapDownloads(songs),
+                        if (isVisible() && getActivity() != null) {
-                            songs.stream().map(Download::new).collect(Collectors.toList())
+                            List<Child> songs = directory.getChildren().stream().filter(child -> !child.isDir()).collect(Collectors.toList());
-                    );
+                            DownloadUtil.getDownloadTracker(requireContext()).download(
+                                    MappingUtil.mapDownloads(songs),
+                                    songs.stream().map(Download::new).collect(Collectors.toList())
+                            );
+                        }
+                    });
                 }
             });
+
+            dialog.show(activity.getSupportFragmentManager(), null);
+
             return true;
         }
 
@@ -144,6 +158,14 @@ public class DirectoryFragment extends Fragment implements ClickCallback {
             bind.directoryTitleLabel.setText(directory.getName());
 
             musicDirectoryAdapter.setItems(directory.getChildren());
+
+            menuItem.setVisible(
+                    directory.getChildren() != null && directory.getChildren()
+                            .stream()
+                            .filter(child -> !child.isDir())
+                            .findFirst()
+                            .orElse(null) != null
+            );
         });
     }
 

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

@@ -0,0 +1,15 @@
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:orientation="vertical">
+
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="24dp"
+        android:layout_marginTop="12dp"
+        android:layout_marginEnd="24dp"
+        android:layout_marginBottom="4dp"
+        android:text="@string/download_directory_dialog_summary" />
+
+</LinearLayout>

app/src/main/res/menu/directory_page_menu.xml

@@ -5,5 +5,6 @@
         android:id="@+id/action_download_directory"
         android:icon="@drawable/ic_file_download"
         android:title="@string/menu_download_all_button"
+        android:visible="false"
         app:showAsAction="never" />
 </menu>

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

@@ -55,6 +55,12 @@
     <string name="delete_download_storage_dialog_positive_button">Continue</string>
     <string name="delete_download_storage_dialog_summary">Please be aware that continuing with this action will result in the permanent deletion of all saved items downloaded from all servers.</string>
     <string name="delete_download_storage_dialog_title">Delete saved items</string>
+
+    <string name="download_directory_dialog_negative_button">Cancel</string>
+    <string name="download_directory_dialog_positive_button">Download</string>
+    <string name="download_directory_dialog_summary">All tracks in this folder will be downloaded. Tracks present in subfolders will not be downloaded.</string>
+    <string name="download_directory_dialog_title">Download the tracks</string>
+
     <string name="download_info_empty_subtitle">Once you download a song, you\'ll find it here</string>
     <string name="download_info_empty_title">No downloads yet!</string>
     <string name="download_item_multiple_subtitle_formatter">%1$s  •  %2$s items</string>