Objectbox (#400)

* replaced SQLite/RoomDb with Objectbox for improved dictionary performance

* SQLite words are automatically cleaned up when opening the Preferences

* added protection against deleting dictionaries while loading other dictionaries

* enabled adding words with apostrophes in Ukrainian

* updated system requirements

README.md

@@ -18,8 +18,8 @@ or get the APK from the [Releases Section](https://github.com/sspanak/tt9/releas
 ## System Requirements
 - Android 4.4 or higher. _(Tested and confirmed on Android 4.4.2, 10 and 11)_
 - Free space:
-  - Minimum 30 Mb when not using Predictive mode and no dictionaries are loaded.
-  - Plenty of space per each enabled language in Predictive mode (25-100 Mb, depending on the word count).
+  - Minimum 40 Mb when not using Predictive mode and no dictionaries are loaded.
+  - Plenty of space per each enabled language in Predictive mode (50-400 Mb, depending on the word count).
 - A hardware keypad or a keyboard. For touchscreen-only devices, an on-screen keypad can be enabled in the Settings.
 
 _If you own a phone with Android 2.2 up to 4.4, please refer to the original version of Traditional T9 from 2016._

build.gradle

@@ -9,21 +9,20 @@ buildscript {
 	dependencies {
 		classpath 'com.android.tools.build:gradle:8.0.2'
 		classpath 'gradle.plugin.at.zierler:yaml-validator-plugin:1.5.0'
+		classpath("io.objectbox:objectbox-gradle-plugin:3.7.1")
 	}
 }
+
 apply plugin: 'com.android.application'
 apply plugin: 'at.zierler.yamlvalidator'
+apply plugin: "io.objectbox"
 
 apply from: 'gradle/scripts/constants.gradle'
 apply from: 'gradle/scripts/dictionary-tools.gradle'
 apply from: 'gradle/scripts/validate-languages.gradle'
 apply from: 'gradle/scripts/version-tools.gradle'
 
 configurations.configureEach {
-	// fixes 'duplicate class error', when using these combine: androidx.core:1.10.1, androidx.preference:1.2.0 and androidx.room:2.5.1
-	// see: https://stackoverflow.com/questions/75274720/a-failure-occurred-while-executing-appcheckdebugduplicateclasses/75315276#75315276
-	exclude group: 'org.jetbrains.kotlin', module: 'kotlin-stdlib-jdk8'
-
 	yamlValidator {
 		searchPaths = ['languages/definitions']
 	}
@@ -32,8 +31,10 @@ configurations.configureEach {
 dependencies {
 	implementation 'androidx.core:core:1.10.1'
 	implementation 'androidx.preference:preference:1.2.1'
-	implementation 'androidx.room:room-runtime:2.5.2'
-	annotationProcessor 'androidx.room:room-compiler:2.5.2'
+
+	// fixes 'duplicate class error' when using "androidx.core" > 1.9.0
+	// see: https://stackoverflow.com/a/77323424
+	implementation(platform("org.jetbrains.kotlin:kotlin-bom:1.8.0"))
 }
 
 repositories {

objectbox-models/default.json

@@ -0,0 +1,78 @@
+{
+  "_note1": "KEEP THIS FILE! Check it into a version control system (VCS) like git.",
+  "_note2": "ObjectBox manages crucial IDs for your object model. See docs for details.",
+  "_note3": "If you have VCS merge conflicts, you must resolve them according to ObjectBox docs.",
+  "entities": [
+    {
+      "id": "1:8686759156275895115",
+      "lastPropertyId": "9:148562041880145406",
+      "name": "Word",
+      "properties": [
+        {
+          "id": "1:7053654361616810150",
+          "name": "id",
+          "type": 6,
+          "flags": 1
+        },
+        {
+          "id": "2:1100881396300803213",
+          "name": "frequency",
+          "type": 5
+        },
+        {
+          "id": "3:3482550679443532896",
+          "name": "isCustom",
+          "type": 1
+        },
+        {
+          "id": "4:7366572918924354162",
+          "name": "langId",
+          "type": 5
+        },
+        {
+          "id": "5:2610279871343053806",
+          "name": "length",
+          "type": 5
+        },
+        {
+          "id": "6:5269773217039117329",
+          "name": "sequence",
+          "indexId": "1:2971223841434624317",
+          "type": 9,
+          "flags": 2048
+        },
+        {
+          "id": "7:3922044271904033267",
+          "name": "sequenceShort",
+          "indexId": "2:2641086768976362614",
+          "type": 2,
+          "flags": 8
+        },
+        {
+          "id": "8:1684236207225806285",
+          "name": "uniqueId",
+          "indexId": "3:5820769207826940948",
+          "type": 9,
+          "flags": 34848
+        },
+        {
+          "id": "9:148562041880145406",
+          "name": "word",
+          "type": 9
+        }
+      ],
+      "relations": []
+    }
+  ],
+  "lastEntityId": "1:8686759156275895115",
+  "lastIndexId": "3:5820769207826940948",
+  "lastRelationId": "0:0",
+  "lastSequenceId": "0:0",
+  "modelVersion": 5,
+  "modelVersionParserMinimum": 5,
+  "retiredEntityUids": [],
+  "retiredIndexUids": [],
+  "retiredPropertyUids": [],
+  "retiredRelationUids": [],
+  "version": 1
+}