Create 'Add to Multireddit' action for subreddits

src/main/java/org/quantumbadger/redreader/adapters/MainMenuListingManager.java

@@ -48,6 +48,7 @@
 import org.quantumbadger.redreader.common.ScreenreaderPronunciation;
 import org.quantumbadger.redreader.common.SharedPrefsWrapper;
 import org.quantumbadger.redreader.common.UriString;
+import org.quantumbadger.redreader.fragments.AddToMultiredditDialog;
 import org.quantumbadger.redreader.fragments.MainMenuFragment;
 import org.quantumbadger.redreader.receivers.announcements.Announcement;
 import org.quantumbadger.redreader.receivers.announcements.AnnouncementDownloader;
@@ -117,7 +118,8 @@ public enum SubredditAction {
 		UNPIN(R.string.unpin_subreddit),
 		SUBSCRIBE(R.string.options_subscribe),
 		UNSUBSCRIBE(R.string.options_unsubscribe),
-		EXTERNAL(R.string.action_external);
+		EXTERNAL(R.string.action_external),
+		ADD_TO_MULTIREDDIT(R.string.add_subreddit_to_multireddit);
 
 		public final int descriptionResId;
 
@@ -820,6 +822,13 @@ public static void showActionMenu(
 					}
 				}
 			}
+
+			if(itemPref.contains(SubredditAction.ADD_TO_MULTIREDDIT)) {
+				menu.add(new SubredditMenuItem(
+						activity,
+						R.string.add_subreddit_to_multireddit,
+						SubredditAction.ADD_TO_MULTIREDDIT));
+			}
 		}
 
 		final String[] menuText = new String[menu.size()];
@@ -941,6 +950,11 @@ private static void onSubredditActionMenuItemSelected(
 							Toast.LENGTH_SHORT).show();
 				}
 				break;
+
+			case ADD_TO_MULTIREDDIT:
+
+				AddToMultiredditDialog.show(activity, subredditCanonicalId);
+				break;
 		}
 	}
 

src/main/java/org/quantumbadger/redreader/fragments/AddToMultiredditDialog.java

@@ -0,0 +1,162 @@
+/*******************************************************************************
+ * This file is part of RedReader.
+ *
+ * RedReader is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * RedReader is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with RedReader.  If not, see <http://www.gnu.org/licenses/>.
+ ******************************************************************************/
+
+package org.quantumbadger.redreader.fragments;
+
+import android.util.Log;
+import android.view.KeyEvent;
+import android.view.View;
+import android.view.WindowManager;
+import android.view.inputmethod.EditorInfo;
+import android.widget.ArrayAdapter;
+import android.widget.AutoCompleteTextView;
+import android.widget.Toast;
+
+import androidx.annotation.NonNull;
+import androidx.appcompat.app.AlertDialog;
+import androidx.appcompat.app.AppCompatActivity;
+
+import com.google.android.material.dialog.MaterialAlertDialogBuilder;
+
+import org.quantumbadger.redreader.R;
+import org.quantumbadger.redreader.account.RedditAccountManager;
+import org.quantumbadger.redreader.cache.CacheManager;
+import org.quantumbadger.redreader.common.RRError;
+import org.quantumbadger.redreader.common.TimestampBound;
+import org.quantumbadger.redreader.reddit.APIResponseHandler;
+import org.quantumbadger.redreader.reddit.RedditAPI;
+import org.quantumbadger.redreader.reddit.api.RedditMultiredditSubscriptionManager;
+import org.quantumbadger.redreader.reddit.things.SubredditCanonicalId;
+import org.quantumbadger.redreader.views.liststatus.ErrorView;
+
+import java.util.ArrayList;
+import java.util.Collections;
+
+public class AddToMultiredditDialog {
+
+	private final static String TAG = "AddToMultiredditDialog";
+
+	public static void show(
+			final AppCompatActivity activity,
+			final SubredditCanonicalId subredditCanonicalId) {
+
+		final MaterialAlertDialogBuilder alertBuilder
+				= new MaterialAlertDialogBuilder(activity);
+
+		final View root = activity.getLayoutInflater().inflate(
+				R.layout.add_to_multireddit,
+				null);
+
+		final RedditMultiredditSubscriptionManager multiredditManager
+				= RedditMultiredditSubscriptionManager.getSingleton(
+				activity,
+				RedditAccountManager.getInstance(activity).getDefaultAccount());
+
+		final ArrayList<String> multireddits = multiredditManager.getSubscriptionList();
+		Collections.sort(multireddits);
+
+		final ArrayAdapter<String> autocompleteAdapter = new ArrayAdapter<>(
+				activity,
+				android.R.layout.simple_dropdown_item_1line,
+				multireddits);
+
+		final AutoCompleteTextView editText
+				= root.findViewById(R.id.selected_multireddit);
+		editText.setAdapter(autocompleteAdapter);
+
+		alertBuilder.setView(root);
+
+		alertBuilder.setNegativeButton(R.string.dialog_cancel, null);
+
+		alertBuilder.setPositiveButton(
+				R.string.dialog_go,
+				(dialog, which) -> addToMultireddit(activity, editText, subredditCanonicalId));
+
+		final AlertDialog alertDialog = alertBuilder.create();
+
+		editText.setOnEditorActionListener((v, actionId, event) -> {
+			if(actionId == EditorInfo.IME_ACTION_GO
+					|| event.getKeyCode() == KeyEvent.KEYCODE_ENTER) {
+				addToMultireddit(activity, editText, subredditCanonicalId);
+				alertDialog.dismiss();
+			}
+			return false;
+		});
+
+		alertDialog.getWindow()
+				.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE
+						| WindowManager.LayoutParams.SOFT_INPUT_ADJUST_PAN);
+		alertDialog.show();
+	}
+
+	private static void addToMultireddit(
+			final AppCompatActivity activity,
+			final AutoCompleteTextView editText,
+			final SubredditCanonicalId subredditCanonicalId) {
+
+		final String multiredditName = editText.getText()
+				.toString()
+				.trim()
+				.replace(" ", "");
+		final String subredditName = subredditCanonicalId.getDisplayNameLowercase();
+
+		RedditAPI.addSubredditToMultireddit(
+				CacheManager.getInstance(activity),
+				new APIResponseHandler.ActionResponseHandler(activity) {
+
+					@Override
+					protected void onCallbackException(final Throwable t) {
+						Log.e(
+								TAG, "Error while adding subreddit to multireddit", t);
+						throw new RuntimeException(t);
+					}
+
+					@Override
+					protected void onFailure(@NonNull final RRError error) {
+						activity.runOnUiThread(() -> {
+							final MaterialAlertDialogBuilder builder
+									= new MaterialAlertDialogBuilder(activity);
+							builder.setView(new ErrorView(activity, error));
+							builder.create().show();
+						});
+					}
+
+					@Override
+					protected void onSuccess() {
+						activity.runOnUiThread(() -> Toast.makeText(
+								activity,
+								String.format("Added %s to %s", subredditName, multiredditName),
+								Toast.LENGTH_SHORT).show());
+						RedditMultiredditSubscriptionManager.getSingleton(
+										activity,
+										RedditAccountManager
+												.getInstance(activity).getDefaultAccount())
+								.triggerUpdate(null, TimestampBound.NONE);
+					}
+				},
+				RedditAccountManager.getInstance(activity).getDefaultAccount(),
+				multiredditName,
+				subredditName,
+				activity
+		);
+
+		Toast.makeText(
+				activity,
+				String.format("Adding %s to %s", subredditName, multiredditName),
+				Toast.LENGTH_SHORT).show();
+	}
+}

src/main/res/layout/add_to_multireddit.xml

@@ -0,0 +1,53 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<!--
+  ~ This file is part of RedReader.
+  ~
+  ~ RedReader is free software: you can redistribute it and/or modify
+  ~ it under the terms of the GNU General Public License as published by
+  ~ the Free Software Foundation, either version 3 of the License, or
+  ~ (at your option) any later version.
+  ~
+  ~ RedReader is distributed in the hope that it will be useful,
+  ~ but WITHOUT ANY WARRANTY; without even the implied warranty of
+  ~ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  ~ GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License
+  ~ along with RedReader.  If not, see <http://www.gnu.org/licenses/>.
+  -->
+
+<LinearLayout
+		xmlns:android="http://schemas.android.com/apk/res/android"
+		xmlns:tools="http://schemas.android.com/tools"
+		android:id="@+id/add_to_multireddit_root"
+		android:layout_width="match_parent"
+		android:layout_height="wrap_content"
+		android:orientation="vertical">
+
+	<TextView
+			android:id="@+id/add_to_multireddit_header"
+			android:layout_width="match_parent"
+			android:layout_height="wrap_content"
+			android:layout_marginLeft="8dp"
+			android:layout_marginRight="8dp"
+			android:layout_marginTop="16dp"
+			android:text="@string/add_subreddit_to_multireddit" />
+
+	<AutoCompleteTextView
+			android:id="@+id/selected_multireddit"
+			android:layout_width="match_parent"
+			android:layout_height="wrap_content"
+			android:layout_marginBottom="16dp"
+			android:layout_marginLeft="16dp"
+			android:layout_marginRight="16dp"
+			android:layout_marginTop="16dp"
+			android:inputType="textNoSuggestions"
+			android:imeOptions="actionGo"
+			android:completionThreshold="1"
+			tools:ignore="LabelFor">
+
+		<requestFocus/>
+	</AutoCompleteTextView>
+
+</LinearLayout>

src/main/res/values/arrays.xml

@@ -495,6 +495,7 @@
 		<item>@string/pin_subreddit</item>
 		<item>@string/options_subscribe</item>
 		<item>@string/block_subreddit</item>
+		<item>@string/add_subreddit_to_multireddit</item>
 	</string-array>
 
 	<!-- Constants. Do not change. -->
@@ -505,6 +506,7 @@
 		<item>pin</item>
 		<item>subscribe</item>
 		<item>block</item>
+		<item>add_to_multireddit</item>
 	</string-array>
 
 	<string-array name="pref_menus_subreddit_context_items_default">

src/main/res/values/strings.xml

@@ -1908,4 +1908,6 @@
 	<string name="error_401_message">Reddit says that you are not logged in or have provided invalid credentials.</string>
 	<string name="error_400_title">Bad Request</string>
 	<string name="error_400_message">Reddit says that you have submitted something invalid.</string>
+
+	<string name="add_subreddit_to_multireddit">Add to New or Existing Multireddit</string>
 </resources>