create a table for storing local contacts

app/build.gradle

@@ -47,6 +47,8 @@ ext {
 dependencies {
     implementation 'com.simplemobiletools:commons:3.11.3'
     implementation 'joda-time:joda-time:2.9.9'
+    implementation 'com.facebook.stetho:stetho:1.5.0'
+    implementation 'com.google.code.gson:gson:2.8.2'
 
     debugImplementation "com.squareup.leakcanary:leakcanary-android:$leakCanaryVersion"
     releaseImplementation "com.squareup.leakcanary:leakcanary-android-no-op:$leakCanaryVersion"

app/src/main/kotlin/com/simplemobiletools/contacts/App.kt

@@ -12,6 +12,7 @@ class App : Application() {
                 return
             }
             LeakCanary.install(this)
+            Stetho.initializeWithDefaults(this)
         }
 
         checkUseEnglish()

app/src/main/kotlin/com/simplemobiletools/contacts/activities/MainActivity.kt

@@ -372,7 +372,8 @@ class MainActivity : SimpleActivity(), RefreshContactsListener {
     }
 
     private fun launchAbout() {
-        startAboutActivity(R.string.app_name, LICENSE_KOTLIN or LICENSE_MULTISELECT or LICENSE_JODA or LICENSE_GLIDE, BuildConfig.VERSION_NAME)
+        startAboutActivity(R.string.app_name, LICENSE_KOTLIN or LICENSE_MULTISELECT or LICENSE_JODA or LICENSE_GLIDE or LICENSE_GSON or LICENSE_STETHO,
+                BuildConfig.VERSION_NAME)
     }
 
     override fun refreshContacts() {

app/src/main/kotlin/com/simplemobiletools/contacts/extensions/Context.kt

@@ -17,11 +17,14 @@ import com.simplemobiletools.contacts.activities.EditContactActivity
 import com.simplemobiletools.contacts.activities.ViewContactActivity
 import com.simplemobiletools.contacts.helpers.CONTACT_ID
 import com.simplemobiletools.contacts.helpers.Config
+import com.simplemobiletools.contacts.helpers.DBHelper
 import com.simplemobiletools.contacts.models.Contact
 import java.io.File
 
 val Context.config: Config get() = Config.newInstance(applicationContext)
 
+val Context.dbHelper: DBHelper get() = DBHelper.newInstance(applicationContext)
+
 fun Context.viewContact(contact: Contact) {
     Intent(applicationContext, ViewContactActivity::class.java).apply {
         putExtra(CONTACT_ID, contact.id)

app/src/main/kotlin/com/simplemobiletools/contacts/helpers/DBHelper.kt

@@ -0,0 +1,42 @@
+package com.simplemobiletools.contacts.helpers
+
+import android.content.Context
+import android.database.sqlite.SQLiteDatabase
+import android.database.sqlite.SQLiteOpenHelper
+
+class DBHelper private constructor(val context: Context) : SQLiteOpenHelper(context, DB_NAME, null, DB_VERSION) {
+    private val MAIN_TABLE_NAME = "contacts"
+    private val COL_ID = "id"
+    private val COL_FIRST_NAME = "first_name"
+    private val COL_MIDDLE_NAME = "middle_name"
+    private val COL_SURNAME = "surname"
+    private val COL_PHOTO = "photo"
+    private val COL_PHONE_NUMBERS = "phone_numbers"
+    private val COL_EMAILS = "emails"
+    private val COL_EVENTS = "events"
+    private val COL_STARRED = "starred"
+
+    private val mDb: SQLiteDatabase = writableDatabase
+
+    companion object {
+        private const val DB_VERSION = 1
+        const val DB_NAME = "contacts.db"
+        var dbInstance: DBHelper? = null
+
+        fun newInstance(context: Context): DBHelper {
+            if (dbInstance == null)
+                dbInstance = DBHelper(context)
+
+            return dbInstance!!
+        }
+    }
+
+    override fun onCreate(db: SQLiteDatabase) {
+        db.execSQL("CREATE TABLE $MAIN_TABLE_NAME ($COL_ID INTEGER PRIMARY KEY AUTOINCREMENT, $COL_FIRST_NAME TEXT, $COL_MIDDLE_NAME TEXT, " +
+                "$COL_SURNAME TEXT, $COL_PHOTO BLOB, $COL_PHONE_NUMBERS TEXT, $COL_EMAILS TEXT, $COL_EVENTS TEXT, $COL_STARRED INTEGER)")
+    }
+
+    override fun onUpgrade(db: SQLiteDatabase, oldVersion: Int, newVersion: Int) {
+
+    }
+}