Create polls (#1452)

* add AddPollDialog

* add support for pleroma poll options

* add PollPreviewView

* add Poll support to drafts

* add license header, cleanup

* rename drawable files to correct size

* fix tests

* fix bug with Poll having wrong duration after delete&redraft

* add input validation

* grey out poll button when its disabled

* code cleanup & small improvements

app/src/main/java/com/keylesspalace/tusky/db/AppDatabase.java

@@ -30,7 +30,7 @@ import androidx.annotation.NonNull;
 
 @Database(entities = {TootEntity.class, AccountEntity.class, InstanceEntity.class, TimelineStatusEntity.class,
                 TimelineAccountEntity.class,  ConversationEntity.class
-        }, version = 18)
+        }, version = 19)
 public abstract class AppDatabase extends RoomDatabase {
 
     public abstract TootDao tootDao();
@@ -300,4 +300,14 @@ public abstract class AppDatabase extends RoomDatabase {
         }
     };
 
+    public static final Migration MIGRATION_18_19 = new Migration(18, 19) {
+        @Override
+        public void migrate(@NonNull SupportSQLiteDatabase database) {
+            database.execSQL("ALTER TABLE `InstanceEntity` ADD COLUMN `maxPollOptions` INTEGER");
+            database.execSQL("ALTER TABLE `InstanceEntity` ADD COLUMN `maxPollOptionLength` INTEGER");
+
+            database.execSQL("ALTER TABLE `TootEntity` ADD COLUMN `poll` TEXT");
+        }
+    };
+
 }

app/src/main/java/com/keylesspalace/tusky/db/InstanceEntity.kt

@@ -25,4 +25,7 @@ import com.keylesspalace.tusky.entity.Emoji
 data class InstanceEntity(
         @field:PrimaryKey var instance: String,
         val emojiList: List<Emoji>?,
-        val maximumTootCharacters: Int?)
+        val maximumTootCharacters: Int?,
+        val maxPollOptions: Int?,
+        val maxPollOptionLength: Int?
+)

app/src/main/java/com/keylesspalace/tusky/db/TootEntity.java

@@ -15,6 +15,8 @@
 
 package com.keylesspalace.tusky.db;
 
+import com.google.gson.Gson;
+import com.keylesspalace.tusky.entity.NewPoll;
 import com.keylesspalace.tusky.entity.Status;
 
 import androidx.annotation.Nullable;
@@ -60,9 +62,13 @@ public class TootEntity {
     @ColumnInfo(name = "visibility")
     private final Status.Visibility visibility;
 
+    @Nullable
+    @ColumnInfo(name = "poll")
+    private final NewPoll poll;
+
     public TootEntity(int uid, String text, String urls, String descriptions, String contentWarning, String inReplyToId,
                       @Nullable String inReplyToText, @Nullable String inReplyToUsername,
-                      Status.Visibility visibility) {
+                      Status.Visibility visibility, @Nullable NewPoll poll) {
         this.uid = uid;
         this.text = text;
         this.urls = urls;
@@ -72,6 +78,7 @@ public class TootEntity {
         this.inReplyToText = inReplyToText;
         this.inReplyToUsername = inReplyToUsername;
         this.visibility = visibility;
+        this.poll = poll;
     }
 
     public String getText() {
@@ -112,8 +119,15 @@ public class TootEntity {
         return visibility;
     }
 
+    @Nullable
+    public NewPoll getPoll() {
+        return poll;
+    }
+
     public static final class Converters {
 
+        private static final Gson gson = new Gson();
+
         @TypeConverter
         public Status.Visibility visibilityFromInt(int number) {
             return Status.Visibility.byNum(number);
@@ -123,5 +137,15 @@ public class TootEntity {
         public int intFromVisibility(Status.Visibility visibility) {
             return visibility == null ? Status.Visibility.UNKNOWN.getNum() : visibility.getNum();
         }
+
+        @TypeConverter
+        public String pollToString(NewPoll poll) {
+            return gson.toJson(poll);
+        }
+
+        @TypeConverter
+        public NewPoll stringToPoll(String poll) {
+            return gson.fromJson(poll, NewPoll.class);
+        }
     }
 }