[needs help] Support announcements (#1977)

* Implement announcements activity

* Update reactions without api access

* Add badge style

* Use emptyList() as default parameter

* Simplify newIntent

* Use List instead of Array

* Remove unneeded ConstraintLayout

* Add lineSpacingMultiplier

* Fix wording

* Apply material design's default chip style

* Dismiss announcements automatically

app/src/main/AndroidManifest.xml

@@ -36,7 +36,7 @@
         </activity>
         <activity
             android:name=".SavedTootActivity"
-            android:configChanges="orientation|screenSize|keyboardHidden"/>
+            android:configChanges="orientation|screenSize|keyboardHidden" />
         <activity
             android:name=".LoginActivity"
             android:windowSoftInputMode="adjustResize">
@@ -105,7 +105,7 @@
         <activity
             android:name=".components.compose.ComposeActivity"
             android:theme="@style/TuskyDialogActivityTheme"
-            android:windowSoftInputMode="stateVisible|adjustResize"/>
+            android:windowSoftInputMode="stateVisible|adjustResize" />
         <activity
             android:name=".ViewThreadActivity"
             android:configChanges="orientation|screenSize" />
@@ -145,6 +145,7 @@
             android:windowSoftInputMode="stateAlwaysHidden|adjustResize" />
         <activity android:name=".components.instancemute.InstanceListActivity" />
         <activity android:name=".components.scheduled.ScheduledTootActivity" />
+        <activity android:name=".components.announcements.AnnouncementsActivity" />
 
         <receiver android:name=".receiver.NotificationClearBroadcastReceiver" />
         <receiver
@@ -180,7 +181,7 @@
             android:name="androidx.work.impl.WorkManagerInitializer"
             android:authorities="${applicationId}.workmanager-init"
             android:exported="false"
-            tools:node="remove"/>
+            tools:node="remove" />
     </application>
 
 </manifest>

app/src/main/java/com/keylesspalace/tusky/MainActivity.kt

@@ -47,6 +47,7 @@ import com.google.android.material.tabs.TabLayout
 import com.google.android.material.tabs.TabLayout.OnTabSelectedListener
 import com.google.android.material.tabs.TabLayoutMediator
 import com.keylesspalace.tusky.appstore.*
+import com.keylesspalace.tusky.components.announcements.AnnouncementsActivity
 import com.keylesspalace.tusky.components.compose.ComposeActivity
 import com.keylesspalace.tusky.components.compose.ComposeActivity.Companion.canHandleMimeType
 import com.keylesspalace.tusky.components.conversation.ConversationsRepository
@@ -67,6 +68,9 @@ import com.mikepenz.iconics.IconicsDrawable
 import com.mikepenz.iconics.typeface.library.googlematerial.GoogleMaterial
 import com.mikepenz.iconics.utils.colorInt
 import com.mikepenz.iconics.utils.sizeDp
+import com.mikepenz.materialdrawer.holder.BadgeStyle
+import com.mikepenz.materialdrawer.holder.ColorHolder
+import com.mikepenz.materialdrawer.holder.StringHolder
 import com.mikepenz.materialdrawer.iconics.iconicsIcon
 import com.mikepenz.materialdrawer.model.*
 import com.mikepenz.materialdrawer.model.interfaces.*
@@ -97,6 +101,8 @@ class MainActivity : BottomSheetActivity(), ActionButtonActivity, HasAndroidInje
     private var notificationTabPosition = 0
     private var onTabSelectedListener: OnTabSelectedListener? = null
 
+    private var unreadAnnouncementsCount = 0
+
     private val preferences by lazy { PreferenceManager.getDefaultSharedPreferences(this) }
 
     private val emojiInitCallback = object : InitCallback() {
@@ -191,6 +197,8 @@ class MainActivity : BottomSheetActivity(), ActionButtonActivity, HasAndroidInje
          * drawer, though, because its callback touches the header in the drawer. */
         fetchUserInfo()
 
+        fetchAnnouncements()
+
         setupTabs(showNotificationTab)
 
         // Setup push notifications
@@ -206,6 +214,10 @@ class MainActivity : BottomSheetActivity(), ActionButtonActivity, HasAndroidInje
                     when (event) {
                         is ProfileEditedEvent -> onFetchUserInfoSuccess(event.newProfileData)
                         is MainTabsChangedEvent -> setupTabs(false)
+                        is AnnouncementReadEvent -> {
+                            unreadAnnouncementsCount--
+                            updateAnnouncementsBadge()
+                        }
                     }
                 }
 
@@ -392,6 +404,18 @@ class MainActivity : BottomSheetActivity(), ActionButtonActivity, HasAndroidInje
                             startActivityWithSlideInAnimation(ScheduledTootActivity.newIntent(context))
                         }
                     },
+                    primaryDrawerItem {
+                        identifier = DRAWER_ITEM_ANNOUNCEMENTS
+                        nameRes = R.string.title_announcements
+                        iconRes = R.drawable.ic_bullhorn_24dp
+                        onClick = {
+                            startActivityWithSlideInAnimation(AnnouncementsActivity.newIntent(context))
+                        }
+                        badgeStyle = BadgeStyle().apply {
+                            textColor = ColorHolder.fromColor(ThemeUtils.getColor(this@MainActivity, R.attr.colorOnPrimary))
+                            color = ColorHolder.fromColor(ThemeUtils.getColor(this@MainActivity, R.attr.colorPrimary))
+                        }
+                    },
                     DividerDrawerItem(),
                     secondaryDrawerItem {
                         nameRes = R.string.action_view_account_preferences
@@ -653,6 +677,25 @@ class MainActivity : BottomSheetActivity(), ActionButtonActivity, HasAndroidInje
         updateShortcut(this, accountManager.activeAccount!!)
     }
 
+    private fun fetchAnnouncements() {
+        mastodonApi.listAnnouncements(false)
+                .observeOn(AndroidSchedulers.mainThread())
+                .autoDispose(this, Lifecycle.Event.ON_DESTROY)
+                .subscribe(
+                        { announcements ->
+                            unreadAnnouncementsCount = announcements.count { !it.read }
+                            updateAnnouncementsBadge()
+                        },
+                        {
+                            Log.w(TAG, "Failed to fetch announcements.", it)
+                        }
+                )
+    }
+
+    private fun updateAnnouncementsBadge() {
+        mainDrawer.updateBadge(DRAWER_ITEM_ANNOUNCEMENTS, StringHolder(if (unreadAnnouncementsCount == 0) null else unreadAnnouncementsCount.toString()))
+    }
+
     private fun updateProfiles() {
         val profiles: MutableList<IProfile> = accountManager.getAllAccountsOrderedByActive().map { acc ->
             val emojifiedName = EmojiCompat.get().process(acc.displayName.emojify(acc.emojis, header))
@@ -687,6 +730,7 @@ class MainActivity : BottomSheetActivity(), ActionButtonActivity, HasAndroidInje
         private const val TAG = "MainActivity" // logging tag
         private const val DRAWER_ITEM_ADD_ACCOUNT: Long = -13
         private const val DRAWER_ITEM_FOLLOW_REQUESTS: Long = 10
+        private const val DRAWER_ITEM_ANNOUNCEMENTS: Long = 14
         const val STATUS_URL = "statusUrl"
     }
 }

app/src/main/java/com/keylesspalace/tusky/appstore/Events.kt

@@ -20,3 +20,4 @@ data class PreferenceChangedEvent(val preferenceKey: String) : Dispatchable
 data class MainTabsChangedEvent(val newTabs: List<TabData>) : Dispatchable
 data class PollVoteEvent(val statusId: String, val poll: Poll) : Dispatchable
 data class DomainMuteEvent(val instance: String): Dispatchable
+data class AnnouncementReadEvent(val announcementId: String): Dispatchable

app/src/main/java/com/keylesspalace/tusky/components/announcements/AnnouncementAdapter.kt

@@ -0,0 +1,115 @@
+/* Copyright 2020 Tusky Contributors
+ *
+ * This file is a part of Tusky.
+ *
+ * This program 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.
+ *
+ * Tusky 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 Tusky; if not,
+ * see <http://www.gnu.org/licenses>. */
+
+package com.keylesspalace.tusky.components.announcements
+
+import android.view.ContextThemeWrapper
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.TextView
+import androidx.core.view.size
+import androidx.recyclerview.widget.RecyclerView
+import com.google.android.material.chip.Chip
+import com.google.android.material.chip.ChipGroup
+import com.keylesspalace.tusky.R
+import com.keylesspalace.tusky.entity.Announcement
+import com.keylesspalace.tusky.entity.Emoji
+import com.keylesspalace.tusky.util.emojify
+import kotlinx.android.synthetic.main.item_announcement.view.*
+
+interface AnnouncementActionListener {
+    fun openReactionPicker(announcementId: String, target: View)
+    fun addReaction(announcementId: String, name: String)
+    fun removeReaction(announcementId: String, name: String)
+}
+
+class AnnouncementAdapter(
+        private var items: List<Announcement> = emptyList(),
+        private val listener: AnnouncementActionListener
+) : RecyclerView.Adapter<AnnouncementAdapter.AnnouncementViewHolder>() {
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): AnnouncementViewHolder {
+        val view = LayoutInflater.from(parent.context)
+                .inflate(R.layout.item_announcement, parent, false)
+        return AnnouncementViewHolder(view)
+    }
+
+    override fun onBindViewHolder(viewHolder: AnnouncementViewHolder, position: Int) {
+        viewHolder.bind(items[position])
+    }
+
+    override fun getItemCount() = items.size
+
+    fun updateList(items: List<Announcement>) {
+        this.items = items
+        notifyDataSetChanged()
+    }
+
+    inner class AnnouncementViewHolder(private val view: View) : RecyclerView.ViewHolder(view) {
+
+        private val text: TextView = view.text
+        private val chips: ChipGroup = view.chipGroup
+        private val addReactionChip: Chip = view.addReactionChip
+
+        fun bind(item: Announcement) {
+            text.text = item.content
+
+            item.reactions.forEachIndexed { i, reaction ->
+                (chips.getChildAt(i)?.takeUnless { it.id == R.id.addReactionChip } as Chip?
+                        ?: Chip(ContextThemeWrapper(view.context, R.style.Widget_MaterialComponents_Chip_Choice)).apply {
+                            isCheckable = true
+                            checkedIcon = null
+                            chips.addView(this, i)
+                        })
+                        .apply {
+                            val emojiText = if (reaction.url == null) {
+                                reaction.name
+                            } else {
+                                view.context.getString(R.string.emoji_shortcode_format, reaction.name)
+                            }
+                            text = ("$emojiText ${reaction.count}")
+                                    .emojify(
+                                            listOf(Emoji(
+                                                    reaction.name,
+                                                    reaction.url ?: "",
+                                                    reaction.staticUrl ?: "",
+                                                    null
+                                            )),
+                                            this
+                                    )
+
+                            isChecked = reaction.me
+
+                            setOnClickListener {
+                                if (reaction.me) {
+                                    listener.removeReaction(item.id, reaction.name)
+                                } else {
+                                    listener.addReaction(item.id, reaction.name)
+                                }
+                            }
+                        }
+            }
+
+            while (chips.size - 1 > item.reactions.size) {
+                chips.removeViewAt(item.reactions.size)
+            }
+
+            addReactionChip.setOnClickListener {
+                listener.openReactionPicker(item.id, it)
+            }
+        }
+    }
+}

app/src/main/java/com/keylesspalace/tusky/components/announcements/AnnouncementsActivity.kt

@@ -0,0 +1,153 @@
+/* Copyright 2020 Tusky Contributors
+ *
+ * This file is a part of Tusky.
+ *
+ * This program 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.
+ *
+ * Tusky 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 Tusky; if not,
+ * see <http://www.gnu.org/licenses>. */
+
+package com.keylesspalace.tusky.components.announcements
+
+import android.content.Context
+import android.content.Intent
+import android.os.Bundle
+import android.view.MenuItem
+import android.view.View
+import android.widget.PopupWindow
+import androidx.activity.viewModels
+import androidx.lifecycle.Observer
+import androidx.recyclerview.widget.DividerItemDecoration
+import androidx.recyclerview.widget.LinearLayoutManager
+import com.keylesspalace.tusky.BaseActivity
+import com.keylesspalace.tusky.R
+import com.keylesspalace.tusky.adapter.EmojiAdapter
+import com.keylesspalace.tusky.adapter.OnEmojiSelectedListener
+import com.keylesspalace.tusky.di.Injectable
+import com.keylesspalace.tusky.di.ViewModelFactory
+import com.keylesspalace.tusky.util.*
+import com.keylesspalace.tusky.view.EmojiPicker
+import kotlinx.android.synthetic.main.activity_announcements.*
+import kotlinx.android.synthetic.main.toolbar_basic.*
+import javax.inject.Inject
+
+class AnnouncementsActivity : BaseActivity(), AnnouncementActionListener, OnEmojiSelectedListener, Injectable {
+
+    @Inject
+    lateinit var viewModelFactory: ViewModelFactory
+
+    private val viewModel: AnnouncementsViewModel by viewModels { viewModelFactory }
+
+    private val adapter = AnnouncementAdapter(emptyList(), this)
+
+    private val picker by lazy { EmojiPicker(this) }
+    private val pickerDialog by lazy {
+        PopupWindow(this)
+                .apply {
+                    contentView = picker
+                    isFocusable = true
+                    setOnDismissListener {
+                        currentAnnouncementId = null
+                    }
+                }
+    }
+    private var currentAnnouncementId: String? = null
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_announcements)
+
+        setSupportActionBar(toolbar)
+        supportActionBar?.apply {
+            title = getString(R.string.title_announcements)
+            setDisplayHomeAsUpEnabled(true)
+            setDisplayShowHomeEnabled(true)
+        }
+
+        swipeRefreshLayout.setOnRefreshListener(this::refreshAnnouncements)
+        swipeRefreshLayout.setColorSchemeResources(R.color.tusky_blue)
+
+        announcementsList.setHasFixedSize(true)
+        announcementsList.layoutManager = LinearLayoutManager(this)
+        val divider = DividerItemDecoration(this, DividerItemDecoration.VERTICAL)
+        announcementsList.addItemDecoration(divider)
+        announcementsList.adapter = adapter
+
+        viewModel.announcements.observe(this, Observer {
+            when (it) {
+                is Success -> {
+                    progressBar.hide()
+                    swipeRefreshLayout.isRefreshing = false
+                    if (it.data.isNullOrEmpty()) {
+                        errorMessageView.setup(R.drawable.elephant_friend_empty, R.string.no_announcements)
+                        errorMessageView.show()
+                    } else {
+                        errorMessageView.hide()
+                    }
+                    adapter.updateList(it.data ?: listOf())
+                }
+                is Loading -> {
+                    errorMessageView.hide()
+                }
+                is Error -> {
+                    progressBar.hide()
+                    swipeRefreshLayout.isRefreshing = false
+                    errorMessageView.setup(R.drawable.elephant_error, R.string.error_generic) {
+                        refreshAnnouncements()
+                    }
+                    errorMessageView.show()
+                }
+            }
+        })
+
+        viewModel.emojis.observe(this, Observer {
+            picker.adapter = EmojiAdapter(it, this)
+        })
+
+        viewModel.load()
+        progressBar.show()
+    }
+
+    override fun onOptionsItemSelected(item: MenuItem): Boolean {
+        when (item.itemId) {
+            android.R.id.home -> {
+                onBackPressed()
+                return true
+            }
+        }
+        return super.onOptionsItemSelected(item)
+    }
+
+    private fun refreshAnnouncements() {
+        viewModel.load()
+        swipeRefreshLayout.isRefreshing = true
+    }
+
+    override fun openReactionPicker(announcementId: String, target: View) {
+        currentAnnouncementId = announcementId
+        pickerDialog.showAsDropDown(target)
+    }
+
+    override fun onEmojiSelected(shortcode: String) {
+        viewModel.addReaction(currentAnnouncementId!!, shortcode)
+        pickerDialog.dismiss()
+    }
+
+    override fun addReaction(announcementId: String, name: String) {
+        viewModel.addReaction(announcementId, name)
+    }
+
+    override fun removeReaction(announcementId: String, name: String) {
+        viewModel.removeReaction(announcementId, name)
+    }
+
+    companion object {
+        fun newIntent(context: Context) = Intent(context, AnnouncementsActivity::class.java)
+    }
+}

app/src/main/java/com/keylesspalace/tusky/components/announcements/AnnouncementsViewModel.kt

@@ -0,0 +1,187 @@
+/* Copyright 2020 Tusky Contributors
+ *
+ * This file is a part of Tusky.
+ *
+ * This program 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.
+ *
+ * Tusky 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 Tusky; if not,
+ * see <http://www.gnu.org/licenses>. */
+
+package com.keylesspalace.tusky.components.announcements
+
+import android.util.Log
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
+import com.keylesspalace.tusky.appstore.AnnouncementReadEvent
+import com.keylesspalace.tusky.appstore.EventHub
+import com.keylesspalace.tusky.db.AccountManager
+import com.keylesspalace.tusky.db.AppDatabase
+import com.keylesspalace.tusky.db.InstanceEntity
+import com.keylesspalace.tusky.entity.Announcement
+import com.keylesspalace.tusky.entity.Emoji
+import com.keylesspalace.tusky.entity.Instance
+import com.keylesspalace.tusky.network.MastodonApi
+import com.keylesspalace.tusky.util.*
+import io.reactivex.rxkotlin.Singles
+import javax.inject.Inject
+
+class AnnouncementsViewModel @Inject constructor(
+        accountManager: AccountManager,
+        private val appDatabase: AppDatabase,
+        private val mastodonApi: MastodonApi,
+        private val eventHub: EventHub
+) : RxAwareViewModel() {
+
+    private val announcementsMutable = MutableLiveData<Resource<List<Announcement>>>()
+    val announcements: LiveData<Resource<List<Announcement>>> = announcementsMutable
+
+    private val emojisMutable = MutableLiveData<List<Emoji>>()
+    val emojis: LiveData<List<Emoji>> = emojisMutable
+
+    init {
+        Singles.zip(
+                mastodonApi.getCustomEmojis(),
+                appDatabase.instanceDao().loadMetadataForInstance(accountManager.activeAccount?.domain!!)
+                        .map<Either<InstanceEntity, Instance>> { Either.Left(it) }
+                        .onErrorResumeNext(
+                                mastodonApi.getInstance()
+                                        .map { Either.Right<InstanceEntity, Instance>(it) }
+                        )
+        ) { emojis, either ->
+            either.asLeftOrNull()?.copy(emojiList = emojis)
+                    ?: InstanceEntity(
+                            accountManager.activeAccount?.domain!!,
+                            emojis,
+                            either.asRight().maxTootChars,
+                            either.asRight().pollLimits?.maxOptions,
+                            either.asRight().pollLimits?.maxOptionChars,
+                            either.asRight().version
+                    )
+        }
+                .doOnSuccess {
+                    appDatabase.instanceDao().insertOrReplace(it)
+                }
+                .subscribe({
+                    emojisMutable.postValue(it.emojiList)
+                }, {
+                    Log.w(TAG, "Failed to get custom emojis.", it)
+                })
+                .autoDispose()
+    }
+
+    fun load() {
+        announcementsMutable.postValue(Loading())
+        mastodonApi.listAnnouncements()
+                .subscribe({
+                    announcementsMutable.postValue(Success(it))
+                    it.filter { announcement -> !announcement.read }
+                            .forEach { announcement ->
+                                mastodonApi.dismissAnnouncement(announcement.id)
+                                        .subscribe(
+                                                {
+                                                    eventHub.dispatch(AnnouncementReadEvent(announcement.id))
+                                                },
+                                                { throwable ->
+                                                    Log.d(TAG, "Failed to mark announcement as read.", throwable)
+                                                }
+                                        )
+                                        .autoDispose()
+                            }
+                }, {
+                    announcementsMutable.postValue(Error(cause = it))
+                })
+                .autoDispose()
+    }
+
+    fun addReaction(announcementId: String, name: String) {
+        mastodonApi.addAnnouncementReaction(announcementId, name)
+                .subscribe({
+                    announcementsMutable.postValue(
+                            Success(
+                                    announcements.value!!.data!!.map { announcement ->
+                                        if (announcement.id == announcementId) {
+                                            announcement.copy(
+                                                    reactions = if (announcement.reactions.find { reaction -> reaction.name == name } != null) {
+                                                        announcement.reactions.map { reaction ->
+                                                            if (reaction.name == name) {
+                                                                reaction.copy(
+                                                                        count = reaction.count + 1,
+                                                                        me = true
+                                                                )
+                                                            } else {
+                                                                reaction
+                                                            }
+                                                        }
+                                                    } else {
+                                                        listOf(
+                                                                *announcement.reactions.toTypedArray(),
+                                                                emojis.value!!.find { emoji -> emoji.shortcode == name }
+                                                                        !!.run {
+                                                                            Announcement.Reaction(
+                                                                                    name,
+                                                                                    1,
+                                                                                    true,
+                                                                                    url,
+                                                                                    staticUrl
+                                                                            )
+                                                                        }
+                                                        )
+                                                    }
+                                            )
+                                        } else {
+                                            announcement
+                                        }
+                                    }
+                            )
+                    )
+                }, {
+                    Log.w(TAG, "Failed to add reaction to the announcement.", it)
+                })
+                .autoDispose()
+    }
+
+    fun removeReaction(announcementId: String, name: String) {
+        mastodonApi.removeAnnouncementReaction(announcementId, name)
+                .subscribe({
+                    announcementsMutable.postValue(
+                            Success(
+                                    announcements.value!!.data!!.map { announcement ->
+                                        if (announcement.id == announcementId) {
+                                            announcement.copy(
+                                                    reactions = announcement.reactions.mapNotNull { reaction ->
+                                                        if (reaction.name == name) {
+                                                            if (reaction.count > 1) {
+                                                                reaction.copy(
+                                                                        count = reaction.count - 1,
+                                                                        me = false
+                                                                )
+                                                            } else {
+                                                                null
+                                                            }
+                                                        } else {
+                                                            reaction
+                                                        }
+                                                    }
+                                            )
+                                        } else {
+                                            announcement
+                                        }
+                                    }
+                            )
+                    )
+                }, {
+                    Log.w(TAG, "Failed to remove reaction from the announcement.", it)
+                })
+                .autoDispose()
+    }
+
+    companion object {
+        private const val TAG = "AnnouncementsViewModel"
+    }
+}

app/src/main/java/com/keylesspalace/tusky/components/compose/ComposeActivity.kt

@@ -50,7 +50,6 @@ import androidx.core.view.inputmethod.InputContentInfoCompat
 import androidx.core.view.isGone
 import androidx.core.view.isVisible
 import androidx.preference.PreferenceManager
-import androidx.recyclerview.widget.GridLayoutManager
 import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.transition.TransitionManager
 import com.google.android.material.bottomsheet.BottomSheetBehavior
@@ -301,7 +300,7 @@ class ComposeActivity : BaseActivity(),
             }
             viewModel.media.observe { media ->
                 mediaAdapter.submitList(media)
-                if(media.size != mediaCount) {
+                if (media.size != mediaCount) {
                     mediaCount = media.size
                     composeMediaPreviewBar.visible(media.isNotEmpty())
                     updateSensitiveMediaToggle(viewModel.markMediaAsSensitive.value != false, viewModel.showContentWarning.value != false)
@@ -311,8 +310,8 @@ class ComposeActivity : BaseActivity(),
                 pollPreview.visible(poll != null)
                 poll?.let(pollPreview::setPoll)
             }
-            viewModel.scheduledAt.observe {scheduledAt ->
+            viewModel.scheduledAt.observe { scheduledAt ->
-                if(scheduledAt == null) {
+                if (scheduledAt == null) {
                     composeScheduleView.resetSchedule()
                 } else {
                     composeScheduleView.setDateTime(scheduledAt)
@@ -344,7 +343,6 @@ class ComposeActivity : BaseActivity(),
         scheduleBehavior = BottomSheetBehavior.from(composeScheduleView)
         emojiBehavior = BottomSheetBehavior.from(emojiView)
 
-        emojiView.layoutManager = GridLayoutManager(this, 3, GridLayoutManager.HORIZONTAL, false)
         enableButton(composeEmojiButton, clickable = false, colorActive = false)
 
         // Setup the interface buttons.
@@ -552,7 +550,7 @@ class ComposeActivity : BaseActivity(),
     }
 
     private fun onScheduleClick() {
-        if(viewModel.scheduledAt.value == null) {
+        if (viewModel.scheduledAt.value == null) {
             composeScheduleView.openPickDateDialog()
         } else {
             showScheduleView()
@@ -715,9 +713,9 @@ class ComposeActivity : BaseActivity(),
         // Verify the returned content's type is of the correct MIME type
         val supported = inputContentInfo.description.hasMimeType("image/*")
 
-        if(supported) {
+        if (supported) {
             val lacksPermission = (flags and InputConnectionCompat.INPUT_CONTENT_GRANT_READ_URI_PERMISSION) != 0
-            if(lacksPermission) {
+            if (lacksPermission) {
                 try {
                     inputContentInfo.requestPermission()
                 } catch (e: Exception) {
@@ -771,7 +769,7 @@ class ComposeActivity : BaseActivity(),
                         Snackbar.LENGTH_SHORT).apply {
 
                 }
-                bar.setAction(R.string.action_retry) { onMediaPick()}
+                bar.setAction(R.string.action_retry) { onMediaPick() }
                 //necessary so snackbar is shown over everything
                 bar.view.elevation = resources.getDimension(R.dimen.compose_activity_snackbar_elevation)
                 bar.show()
@@ -913,7 +911,7 @@ class ComposeActivity : BaseActivity(),
 
     override fun onKeyDown(keyCode: Int, event: KeyEvent): Boolean {
         Log.d(TAG, event.toString())
-        if(event.action == KeyEvent.ACTION_DOWN) {
+        if (event.action == KeyEvent.ACTION_DOWN) {
             if (event.isCtrlPressed) {
                 if (keyCode == KeyEvent.KEYCODE_ENTER) {
                     // send toot by pressing CTRL + ENTER

app/src/main/java/com/keylesspalace/tusky/di/ActivitiesModule.kt

@@ -16,6 +16,7 @@
 package com.keylesspalace.tusky.di
 
 import com.keylesspalace.tusky.*
+import com.keylesspalace.tusky.components.announcements.AnnouncementsActivity
 import com.keylesspalace.tusky.components.compose.ComposeActivity
 import com.keylesspalace.tusky.components.instancemute.InstanceListActivity
 import com.keylesspalace.tusky.components.preference.PreferencesActivity
@@ -103,4 +104,7 @@ abstract class ActivitiesModule {
 
     @ContributesAndroidInjector
     abstract fun contributesScheduledTootActivity(): ScheduledTootActivity
+
+    @ContributesAndroidInjector
+    abstract fun contributesAnnouncementsActivity(): AnnouncementsActivity
 }

app/src/main/java/com/keylesspalace/tusky/di/ViewModelFactory.kt

@@ -4,6 +4,7 @@ package com.keylesspalace.tusky.di
 
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.ViewModelProvider
+import com.keylesspalace.tusky.components.announcements.AnnouncementsViewModel
 import com.keylesspalace.tusky.components.compose.ComposeViewModel
 import com.keylesspalace.tusky.components.conversation.ConversationsViewModel
 import com.keylesspalace.tusky.components.report.ReportViewModel
@@ -85,5 +86,10 @@ abstract class ViewModelModule {
     @ViewModelKey(ScheduledTootViewModel::class)
     internal abstract fun scheduledTootViewModel(viewModel: ScheduledTootViewModel): ViewModel
 
+    @Binds
+    @IntoMap
+    @ViewModelKey(AnnouncementsViewModel::class)
+    internal abstract fun announcementsViewModel(viewModel: AnnouncementsViewModel): ViewModel
+
     //Add more ViewModels here
 }

app/src/main/java/com/keylesspalace/tusky/entity/Announcement.kt

@@ -0,0 +1,57 @@
+/* Copyright 2020 Tusky Contributors
+ *
+ * This file is a part of Tusky.
+ *
+ * This program 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.
+ *
+ * Tusky 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 Tusky; if not,
+ * see <http://www.gnu.org/licenses>. */
+
+package com.keylesspalace.tusky.entity
+
+import android.text.Spanned
+import com.google.gson.annotations.SerializedName
+import java.util.*
+
+data class Announcement(
+        val id: String,
+        val content: Spanned,
+        @SerializedName("starts_at") val startsAt: Date?,
+        @SerializedName("ends_at") val endsAt: Date?,
+        @SerializedName("all_day") val allDay: Boolean,
+        @SerializedName("published_at") val publishedAt: Date,
+        @SerializedName("updated_at") val updatedAt: Date,
+        val read: Boolean,
+        val mentions: List<Status.Mention>,
+        val statuses: List<Status>,
+        val tags: List<HashTag>,
+        val emojis: List<Emoji>,
+        val reactions: List<Reaction>
+) {
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (other == null || javaClass != other.javaClass) return false
+
+        val announcement = other as Announcement?
+        return id == announcement?.id
+    }
+
+    override fun hashCode(): Int {
+        return id.hashCode()
+    }
+
+    data class Reaction(
+            val name: String,
+            var count: Int,
+            var me: Boolean,
+            val url: String?,
+            @SerializedName("static_url") val staticUrl: String?
+    )
+}

app/src/main/java/com/keylesspalace/tusky/entity/Emoji.kt

@@ -23,5 +23,6 @@ import kotlinx.android.parcel.Parcelize
 data class Emoji(
         val shortcode: String,
         val url: String,
+        @SerializedName("static_url") val staticUrl: String,
         @SerializedName("visible_in_picker") val visibleInPicker: Boolean?
 ) : Parcelable

app/src/main/java/com/keylesspalace/tusky/network/MastodonApi.kt

@@ -513,6 +513,28 @@ interface MastodonApi {
             @Field("choices[]") choices: List<Int>
     ): Single<Poll>
 
+    @GET("api/v1/announcements")
+    fun listAnnouncements(
+            @Query("with_dismissed") withDismissed: Boolean = true
+    ): Single<List<Announcement>>
+
+    @POST("api/v1/announcements/{id}/dismiss")
+    fun dismissAnnouncement(
+            @Path("id") announcementId: String
+    ): Single<ResponseBody>
+
+    @PUT("api/v1/announcements/{id}/reactions/{name}")
+    fun addAnnouncementReaction(
+            @Path("id") announcementId: String,
+            @Path("name") name: String
+    ): Single<ResponseBody>
+
+    @DELETE("api/v1/announcements/{id}/reactions/{name}")
+    fun removeAnnouncementReaction(
+            @Path("id") announcementId: String,
+            @Path("name") name: String
+    ): Single<ResponseBody>
+
     @FormUrlEncoded
     @POST("api/v1/reports")
     fun reportObservable(

app/src/main/java/com/keylesspalace/tusky/view/EmojiPicker.kt

@@ -0,0 +1,17 @@
+package com.keylesspalace.tusky.view
+
+import android.content.Context
+import android.util.AttributeSet
+import androidx.recyclerview.widget.GridLayoutManager
+import androidx.recyclerview.widget.RecyclerView
+
+class EmojiPicker @JvmOverloads constructor(
+        context: Context,
+        attrs: AttributeSet? = null
+) : RecyclerView(context, attrs) {
+
+    init {
+        clipToPadding = false
+        layoutManager = GridLayoutManager(context, 3, GridLayoutManager.HORIZONTAL, false)
+    }
+}

app/src/main/res/drawable/ic_bullhorn_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M12,8H4A2,2 0,0 0,2 10V14A2,2 0,0 0,4 16H5V20A1,1 0,0 0,6 21H8A1,1 0,0 0,9 20V16H12L17,20V4L12,8M21.5,12C21.5,13.71 20.54,15.26 19,16V8C20.53,8.75 21.5,10.3 21.5,12Z" />
+</vector>

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

@@ -0,0 +1,39 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <include layout="@layout/toolbar_basic" />
+
+    <ProgressBar
+        android:id="@+id/progressBar"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center" />
+
+    <androidx.swiperefreshlayout.widget.SwipeRefreshLayout
+        android:id="@+id/swipeRefreshLayout"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        app:layout_behavior="@string/appbar_scrolling_view_behavior">
+
+        <androidx.recyclerview.widget.RecyclerView
+            android:id="@+id/announcementsList"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent" />
+
+    </androidx.swiperefreshlayout.widget.SwipeRefreshLayout>
+
+    <com.keylesspalace.tusky.view.BackgroundMessageView
+        android:id="@+id/errorMessageView"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:src="@android:color/transparent"
+        android:visibility="gone"
+        tools:src="@drawable/elephant_error"
+        tools:visibility="visible" />
+
+</androidx.coordinatorlayout.widget.CoordinatorLayout>

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

@@ -193,14 +193,12 @@
             android:textSize="?attr/status_text_medium" />
     </LinearLayout>
 
-    <androidx.recyclerview.widget.RecyclerView
+    <com.keylesspalace.tusky.view.EmojiPicker
         android:id="@+id/emojiView"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:background="?attr/colorSurface"
-        android:clipToPadding="false"
         android:elevation="12dp"
-        android:orientation="vertical"
         android:paddingStart="16dp"
         android:paddingTop="8dp"
         android:paddingEnd="16dp"

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

@@ -0,0 +1,41 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content">
+
+    <androidx.emoji.widget.EmojiTextView
+        android:id="@+id/text"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:lineSpacingMultiplier="1.1"
+        android:padding="8dp"
+        android:textSize="?attr/status_text_medium"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <com.google.android.material.chip.ChipGroup
+        android:id="@+id/chipGroup"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:padding="8dp"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/text">
+
+        <com.google.android.material.chip.Chip
+            android:id="@+id/addReactionChip"
+            style="@style/Widget.MaterialComponents.Chip.Action"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:checkable="false"
+            app:chipEndPadding="4dp"
+            app:chipIcon="@drawable/ic_plus_24dp"
+            app:chipSurfaceColor="@color/tusky_blue"
+            app:textEndPadding="0dp"
+            app:textStartPadding="0dp" />
+
+    </com.google.android.material.chip.ChipGroup>
+
+</androidx.constraintlayout.widget.ConstraintLayout>

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

@@ -42,6 +42,7 @@
     <string name="title_edit_profile">Edit your profile</string>
     <string name="title_saved_toot">Drafts</string>
     <string name="title_scheduled_toot">Scheduled toots</string>
+    <string name="title_announcements">Announcements</string>
     <string name="title_licenses">Licenses</string>
 
     <string name="status_username_format">\@%s</string>
@@ -569,6 +570,7 @@
 
     <string name="no_saved_status">You don\'t have any drafts.</string>
     <string name="no_scheduled_status">You don\'t have any scheduled statuses.</string>
+    <string name="no_announcements">There are no announcements.</string>
     <string name="warning_scheduling_interval">Mastodon has a minimum scheduling interval of 5 minutes.</string>
     <string name="pref_title_show_cards_in_timelines">Show link previews in timelines</string>
     <string name="pref_title_confirm_reblogs">Show confirmation dialog before boosting</string>

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

@@ -79,6 +79,7 @@
 
         <item name="swipeRefreshLayoutProgressSpinnerBackgroundColor">?attr/colorSurface</item>
 
+        <item name="chipStyle">@style/Widget.MaterialComponents.Chip.Choice</item>
     </style>
 
     <style name="ViewMediaActivity.AppBarLayout" parent="ThemeOverlay.AppCompat">