Allow to start/stop queue from download queue fragment. DownloadQueue now extends from ArrayList.

app/src/main/java/eu/kanade/mangafeed/ui/download/DownloadFragment.java

@@ -5,6 +5,9 @@ import android.support.annotation.Nullable;
 import android.support.v7.widget.LinearLayoutManager;
 import android.support.v7.widget.RecyclerView;
 import android.view.LayoutInflater;
+import android.view.Menu;
+import android.view.MenuInflater;
+import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewGroup;
 
@@ -13,9 +16,11 @@ import java.util.List;
 import butterknife.Bind;
 import butterknife.ButterKnife;
 import eu.kanade.mangafeed.R;
+import eu.kanade.mangafeed.data.download.DownloadService;
 import eu.kanade.mangafeed.data.download.model.Download;
 import eu.kanade.mangafeed.ui.base.fragment.BaseRxFragment;
 import nucleus.factory.RequiresPresenter;
+import rx.Subscription;
 
 @RequiresPresenter(DownloadPresenter.class)
 public class DownloadFragment extends BaseRxFragment<DownloadPresenter> {
@@ -23,10 +28,22 @@ public class DownloadFragment extends BaseRxFragment<DownloadPresenter> {
     @Bind(R.id.download_list) RecyclerView recyclerView;
     private DownloadAdapter adapter;
 
+    private MenuItem startButton;
+    private MenuItem stopButton;
+
+    private Subscription queueStatusSubscription;
+    private boolean isRunning;
+
     public static DownloadFragment newInstance() {
         return new DownloadFragment();
     }
 
+    @Override
+    public void onCreate(Bundle bundle) {
+        super.onCreate(bundle);
+        setHasOptionsMenu(true);
+    }
+
     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
                              Bundle savedInstanceState) {
@@ -43,6 +60,51 @@ public class DownloadFragment extends BaseRxFragment<DownloadPresenter> {
         return view;
     }
 
+    @Override
+    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
+        inflater.inflate(R.menu.download_queue, menu);
+        startButton = menu.findItem(R.id.start_queue);
+        stopButton = menu.findItem(R.id.stop_queue);
+
+        // Menu seems to be inflated after onResume in fragments, so we initialize them here
+        startButton.setVisible(!isRunning && !getPresenter().downloadManager.getQueue().isEmpty());
+        stopButton.setVisible(isRunning);
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        switch (item.getItemId()) {
+            case R.id.start_queue:
+                DownloadService.start(getActivity());
+                break;
+            case R.id.stop_queue:
+                DownloadService.stop(getActivity());
+                break;
+        }
+        return super.onOptionsItemSelected(item);
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        queueStatusSubscription = getPresenter().downloadManager.getRunningSubject()
+                .subscribe(this::onRunningChange);
+    }
+
+    @Override
+    public void onPause() {
+        queueStatusSubscription.unsubscribe();
+        super.onPause();
+    }
+
+    private void onRunningChange(boolean running) {
+        isRunning = running;
+        if (startButton != null)
+            startButton.setVisible(!running && !getPresenter().downloadManager.getQueue().isEmpty());
+        if (stopButton != null)
+            stopButton.setVisible(running);
+    }
+
     private void createAdapter() {
         adapter = new DownloadAdapter(getActivity());
         recyclerView.setAdapter(adapter);

app/src/main/java/eu/kanade/mangafeed/ui/download/DownloadPresenter.java

@@ -37,7 +37,7 @@ public class DownloadPresenter extends BasePresenter<DownloadFragment> {
         progressSubscriptions = new HashMap<>();
 
         restartableLatestCache(GET_DOWNLOAD_QUEUE,
-                () -> Observable.just(downloadQueue.get()),
+                () -> Observable.just(downloadQueue),
                 DownloadFragment::onNextDownloads,
                 (view, error) -> Timber.e(error.getMessage()));
 

app/src/main/java/eu/kanade/mangafeed/ui/manga/chapter/ChaptersPresenter.java

@@ -148,7 +148,7 @@ public class ChaptersPresenter extends BasePresenter<ChaptersFragment> {
     }
 
     private void setChapterStatus(Chapter chapter) {
-        for (Download download : downloadManager.getQueue().get()) {
+        for (Download download : downloadManager.getQueue()) {
             if (chapter.id.equals(download.chapter.id)) {
                 chapter.status = download.getStatus();
                 return;