SQLite на Kotlin. Урок 10

Библиотека Coroutines

implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.4.1'

MainActivity

import android.content.Intent
import android.os.Bundle
import android.view.View
import android.widget.SearchView
import androidx.appcompat.app.AppCompatActivity
import androidx.recyclerview.widget.ItemTouchHelper
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import com.example.lessonsqlitekotlin.db.MyAdapter
import com.example.lessonsqlitekotlin.db.MyDbManager
import kotlinx.android.synthetic.main.activity_main.*
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.Job
import kotlinx.coroutines.launch

class MainActivity : AppCompatActivity() {

    val myDbManager = MyDbManager(this)
    val myAdapter = MyAdapter(ArrayList(), this)
    private var job: Job? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        init()
        initSearchView()

    }
    override fun onDestroy() {
        super.onDestroy()
        myDbManager.closeDb()
    }

    override fun onResume() {
        super.onResume()
        myDbManager.openDb()
        fillAdapter("")

    }

    fun onClickNew(view: View) {

        val i = Intent(this,EditActivity::class.java)
        startActivity(i)
    }

    fun init(){

        rcView.layoutManager = LinearLayoutManager(this)
        val swapHelper = getSwapMg()
        swapHelper.attachToRecyclerView(rcView)
        rcView.adapter = myAdapter

    }

    private fun initSearchView(){
        searchView.setOnQueryTextListener(object: SearchView.OnQueryTextListener{
            override fun onQueryTextSubmit(query: String?): Boolean {
                return true
            }

            override fun onQueryTextChange(text: String?): Boolean {
               fillAdapter(text!!)
               return true
            }
        })
    }

    private fun fillAdapter(text: String){

       job?.cancel()
       job = CoroutineScope(Dispatchers.Main).launch{

            val list = myDbManager.readDbData(text)
            myAdapter.updateAdapter(list)
            if(list.size > 0){

                tvNoElements.visibility = View.GONE
            } else {

                tvNoElements.visibility = View.VISIBLE
            }
        }


    }
    private fun getSwapMg(): ItemTouchHelper{
        return ItemTouchHelper(object:ItemTouchHelper.
        SimpleCallback(0,ItemTouchHelper.RIGHT or ItemTouchHelper.LEFT){
            override fun onMove(
                recyclerView: RecyclerView,
                viewHolder: RecyclerView.ViewHolder,
                target: RecyclerView.ViewHolder
            ): Boolean {
                return false
            }

            override fun onSwiped(viewHolder: RecyclerView.ViewHolder, direction: Int) {
                myAdapter.removeItem(viewHolder.adapterPosition, myDbManager)

            }
        })
    }


}

EditActivity

import android.app.Activity
import android.content.Intent
import android.net.Uri
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.util.Log
import android.view.View
import com.example.lessonsqlitekotlin.db.MyDbManager
import com.example.lessonsqlitekotlin.db.MyIntentConstants
import kotlinx.android.synthetic.main.edit_activity.*
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launch
import java.text.SimpleDateFormat
import java.util.*

class EditActivity : AppCompatActivity() {

    var id = 0
    var isEditState = false
    val imageRequestCode = 10
    var tempImageUri = "empty"
    val myDbManager = MyDbManager(this)

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.edit_activity)
        getMyIntents()
        Log.d("MyLog","Time : ${getCurrentTime()}")
    }
    override fun onDestroy() {
        super.onDestroy()
        myDbManager.closeDb()
    }

    override fun onResume() {
        super.onResume()
        myDbManager.openDb()


    }

    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)
        if(resultCode == Activity.RESULT_OK && requestCode == imageRequestCode){

            imMainImage.setImageURI(data?.data)
            tempImageUri = data?.data.toString()
            contentResolver.takePersistableUriPermission(data?.data!!, Intent.FLAG_GRANT_READ_URI_PERMISSION)

        }

    }

    fun onClickAddImage(view: View) {

        mainImageLayout.visibility = View.VISIBLE
        fbAddImage.visibility = View.GONE

    }

    fun onClickDeleteImage(view: View) {

        mainImageLayout.visibility = View.GONE
        fbAddImage.visibility = View.VISIBLE
        tempImageUri = "empty"
    }

    fun onClickChooseImage(view: View) {

        val intent = Intent(Intent.ACTION_OPEN_DOCUMENT)
        intent.type = "image/*"
        startActivityForResult(intent, imageRequestCode)

    }
    fun onClickSave(view: View) {

        val myTitle = edTitle.text.toString()
        val myDesc = edDesc.text.toString()

        if(myTitle != "" && myDesc != ""){

            CoroutineScope(Dispatchers.Main).launch {

                if(isEditState){
                    myDbManager.updateItem(myTitle, myDesc, tempImageUri, id, getCurrentTime())
                } else {
                    myDbManager.insertToDb(myTitle, myDesc, tempImageUri, getCurrentTime())
                }

                finish()
            }

        }



    }

    fun onEditEnable(view:View){
        edTitle.isEnabled = true
        edDesc.isEnabled = true
        fbEdit.visibility = View.GONE
        fbAddImage.visibility = View.VISIBLE
        if(tempImageUri == "empty")return
        imButtonEditImage.visibility = View.VISIBLE
        imButtonDeleteImage.visibility = View.VISIBLE

    }

    fun getMyIntents() {
        fbEdit.visibility = View.GONE
        val i = intent

        if (i != null) {


            if (i.getStringExtra(MyIntentConstants.I_TITLE_KEY) != null) {

                fbAddImage.visibility = View.GONE
                edTitle.setText(i.getStringExtra(MyIntentConstants.I_TITLE_KEY))
                isEditState = true
                edTitle.isEnabled = false
                edDesc.isEnabled = false
                fbEdit.visibility = View.VISIBLE
                edDesc.setText(i.getStringExtra(MyIntentConstants.I_DESC_KEY))
                id = i.getIntExtra(MyIntentConstants.I_ID_KEY, 0)
                if (i.getStringExtra(MyIntentConstants.I_URI_KEY) != "empty") {

                    mainImageLayout.visibility = View.VISIBLE
                    tempImageUri = i.getStringExtra(MyIntentConstants.I_URI_KEY)!!
                    imMainImage.setImageURI(Uri.parse(tempImageUri))
                    imButtonDeleteImage.visibility = View.GONE
                    imButtonEditImage.visibility = View.GONE

                }

            }

        }

    }

    private fun getCurrentTime():String{
       val time = Calendar.getInstance().time
        val formatter = SimpleDateFormat("dd-MM-yy kk:mm",Locale.getDefault())
        return formatter.format(time)
    }
}

MyDbManager

import android.content.ContentValues
import android.content.Context
import android.database.sqlite.SQLiteDatabase
import android.provider.BaseColumns
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.withContext

class MyDbManager(context: Context) {
   val myDbHelper = MyDbHelper(context)
   var db: SQLiteDatabase? = null

    fun openDb(){
        db = myDbHelper.writableDatabase
    }
   suspend fun insertToDb( title: String, content: String, uri: String, time:String) = withContext(Dispatchers.IO){
        val values = ContentValues().apply {

            put(MyDbNameClass.COLUMN_NAME_TITLE, title)
            put(MyDbNameClass.COLUMN_NAME_CONTENT, content)
            put(MyDbNameClass.COLUMN_NAME_IMAGE_URI, uri)
            put(MyDbNameClass.COLUMN_NAME_TIME, time)

        }
        db?.insert(MyDbNameClass.TABLE_NAME,null, values)
    }

    suspend fun updateItem( title: String, content: String, uri: String, id:Int, time:String) = withContext(Dispatchers.IO){
        val selection = BaseColumns._ID + "=$id"
        val values = ContentValues().apply {

            put(MyDbNameClass.COLUMN_NAME_TITLE, title)
            put(MyDbNameClass.COLUMN_NAME_CONTENT, content)
            put(MyDbNameClass.COLUMN_NAME_IMAGE_URI, uri)
            put(MyDbNameClass.COLUMN_NAME_TIME, time)

        }
        db?.update(MyDbNameClass.TABLE_NAME, values, selection, null)
    }

    fun removeItemFromDb( id: String){
       val selection = BaseColumns._ID + "=$id"
        db?.delete(MyDbNameClass.TABLE_NAME,selection, null)
    }

    suspend fun readDbData(searchText:String): ArrayList<ListItem> = withContext(Dispatchers.IO) {
        val dataList = ArrayList<ListItem>()
        val selection = "${MyDbNameClass.COLUMN_NAME_TITLE} like ?"
        val cursor = db?.query(
            MyDbNameClass.TABLE_NAME, null, selection, arrayOf("%$searchText%"),
            null, null, null
        )

        while (cursor?.moveToNext()!!) {
            val dataTitle = cursor.getString(cursor.getColumnIndex(MyDbNameClass.COLUMN_NAME_TITLE))
            val dataContent =
                cursor.getString(cursor.getColumnIndex(MyDbNameClass.COLUMN_NAME_CONTENT))
            val dataUri =
                cursor.getString(cursor.getColumnIndex(MyDbNameClass.COLUMN_NAME_IMAGE_URI))
            val dataId =
                cursor.getInt(cursor.getColumnIndex(BaseColumns._ID))
            val time =
                cursor.getString(cursor.getColumnIndex(MyDbNameClass.COLUMN_NAME_TIME))
            val item = ListItem()
            item.title = dataTitle
            item.desc = dataContent
            item.uri = dataUri
            item.id = dataId
            item.time = time
            dataList.add(item)
        }
        cursor.close()
        return@withContext dataList
    }

    fun closeDb(){
        myDbHelper.close()
    }


}

MyDbHelper

import android.content.Context
import android.database.sqlite.SQLiteDatabase
import android.database.sqlite.SQLiteOpenHelper

class MyDbHelper(context: Context) : SQLiteOpenHelper(context, MyDbNameClass.DATABASE_NAME,
    null, MyDbNameClass.DATABASE_VERSION) {
    override fun onCreate(db: SQLiteDatabase?) {

        db?.execSQL(MyDbNameClass.CREAT_TABLE)
    }

    override fun onUpgrade(db: SQLiteDatabase?, oldVersion: Int, newVersion: Int) {

          db?.execSQL(MyDbNameClass.SQL_DELETE_TABLE)
          onCreate(db)
    }
}

MyAdapter

import android.content.Context
import android.content.Intent
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.TextView
import androidx.recyclerview.widget.RecyclerView
import com.example.lessonsqlitekotlin.EditActivity
import com.example.lessonsqlitekotlin.R

class MyAdapter( listMain:ArrayList<ListItem>, contextM: Context) : RecyclerView.Adapter<MyAdapter.MyHolder>() {
    var listArray = listMain
    var context = contextM


    class MyHolder(itemView: View, contextV:Context) : RecyclerView.ViewHolder(itemView) {

        val tvTitle:TextView = itemView.findViewById(R.id.tvTitle)
        val tvTime:TextView = itemView.findViewById(R.id.tvTime)
        val context = contextV

        fun setData(item:ListItem){

            tvTitle.text = item.title
            tvTime.text = item.time
            itemView.setOnClickListener {

                val intent = Intent(context,EditActivity::class.java).apply {

                    putExtra(MyIntentConstants.I_TITLE_KEY, item.title)
                    putExtra(MyIntentConstants.I_DESC_KEY, item.desc)
                    putExtra(MyIntentConstants.I_URI_KEY, item.uri)
                    putExtra(MyIntentConstants.I_ID_KEY, item.id)

                }
                context.startActivity(intent)

            }


        }

    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyHolder {
        val inflater = LayoutInflater.from(parent.context)
        return MyHolder(inflater.inflate(R.layout.rc_item, parent, false), context)
    }

    override fun getItemCount(): Int {

        return listArray.size

    }

    override fun onBindViewHolder(holder: MyHolder, position: Int) {

        holder.setData(listArray.get(position))
    }

    fun updateAdapter(listItems:List<ListItem>){

        listArray.clear()
        listArray.addAll(listItems)
        notifyDataSetChanged()

    }

    fun removeItem(pos:Int, dbManager: MyDbManager){

        dbManager.removeItemFromDb(listArray[pos].id.toString())
        listArray.removeAt(pos)
        notifyItemRangeChanged(0, listArray.size)
        notifyItemRemoved(pos)


    }
}

ListItem

class ListItem {

    var title = "empty"
    var desc = "empty"
    var uri = "empty"
    var time = ""
    var id = 0
}

MyDbNameClass

import android.provider.BaseColumns

object MyDbNameClass {

    const val TABLE_NAME = "my_table"
    const val COLUMN_NAME_TITLE = "title"
    const val COLUMN_NAME_CONTENT = "content"
    const val COLUMN_NAME_IMAGE_URI = "uri"
    const val COLUMN_NAME_TIME = "time"

    const val DATABASE_VERSION = 2
    const val DATABASE_NAME = "MyLessonDb.db"

   const val CREAT_TABLE = "CREATE TABLE IF NOT EXISTS $TABLE_NAME (" +
           "${BaseColumns._ID} INTEGER PRIMARY KEY,$COLUMN_NAME_TITLE TEXT,$COLUMN_NAME_CONTENT TEXT," +
           "$COLUMN_NAME_IMAGE_URI TEXT,$COLUMN_NAME_TIME TEXT)"
    const val SQL_DELETE_TABLE = "DROP TABLE IF EXISTS $TABLE_NAME"


}

MyIntentConstants

object MyIntentConstants {

    const val I_TITLE_KEY = "title_key"
    const val I_DESC_KEY = "desc_key"
    const val I_URI_KEY = "uri_key"
    const val I_ID_KEY = "id_key"

}

edit_text_color_state.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
 <item android:state_enabled="false" android:color="@color/edit_text_dark"/>
 <item android:color="@color/edit_text_dark"/>
</selector>

activity_main.xml

<?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"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/dark_bg"
    tools:context=".MainActivity">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/rcView"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/searchView"
        app:layout_constraintVertical_bias="1.0" />

    <TextView
        android:id="@+id/tvNoElements"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Empty"
        android:textColor="@color/grey"
        android:textSize="18sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/fbNew"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="16dp"
        android:layout_marginBottom="16dp"
        android:clickable="true"
        android:onClick="onClickNew"
        app:backgroundTint="@color/dark_blue"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:srcCompat="@drawable/ic_add" />

    <SearchView
        android:id="@+id/searchView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

edit_activity.xml

<?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"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/dark_bg"
    tools:context=".EditActivity">

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/guideline2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent="0.33" />

    <EditText
        android:id="@+id/edTitle"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:background="@android:drawable/editbox_background"
        android:ems="10"
        android:hint="@string/ed_title_hint"
        android:inputType="textPersonName"
        android:padding="10dp"
        android:textColor="@color/edit_text_color_state"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/mainImageLayout" />

    <EditText
        android:id="@+id/edDesc"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginTop="8dp"
        android:layout_marginBottom="8dp"
        android:background="@android:drawable/editbox_background"
        android:ems="10"
        android:gravity="top"
        android:hint="@string/ed_desc_hint"
        android:inputType="textMultiLine|textPersonName"
        android:padding="10dp"
        android:textColor="@color/edit_text_color_state"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="@+id/edTitle"
        app:layout_constraintStart_toStartOf="@+id/edTitle"
        app:layout_constraintTop_toBottomOf="@+id/edTitle" />

    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/fbSave"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="16dp"
        android:layout_marginBottom="16dp"
        android:alpha="0.6"
        android:clickable="true"
        android:onClick="onClickSave"
        app:backgroundTint="@color/dark_blue"
        app:layout_constraintBottom_toBottomOf="@+id/edDesc"
        app:layout_constraintEnd_toEndOf="@+id/edDesc"
        app:srcCompat="@drawable/ic_save" />

    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/fbAddImage"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="16dp"
        android:alpha="0.6"
        android:clickable="true"
        android:onClick="onClickAddImage"
        app:layout_constraintBottom_toTopOf="@+id/fbSave"
        app:layout_constraintEnd_toEndOf="@+id/fbSave"
        app:srcCompat="@drawable/ic_add_image" />

    <androidx.constraintlayout.widget.ConstraintLayout
        android:id="@+id/mainImageLayout"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginTop="8dp"
        android:background="@android:drawable/editbox_background"
        android:visibility="gone"
        app:layout_constraintBottom_toTopOf="@+id/guideline2"
        app:layout_constraintEnd_toEndOf="@+id/edTitle"
        app:layout_constraintStart_toStartOf="@+id/edTitle"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.0">

        <ImageView
            android:id="@+id/imMainImage"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:layout_margin="10dp"
            android:scaleType="centerCrop"
            android:visibility="visible"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:srcCompat="@drawable/ic_add_image"
            tools:srcCompat="@tools:sample/avatars" />

        <ImageButton
            android:id="@+id/imButtonDeleteImage"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginEnd="8dp"
            android:layout_marginBottom="8dp"
            android:onClick="onClickDeleteImage"
            app:layout_constraintBottom_toBottomOf="@+id/imMainImage"
            app:layout_constraintEnd_toEndOf="@+id/imMainImage"
            app:srcCompat="@android:drawable/ic_menu_delete" />

        <ImageButton
            android:id="@+id/imButtonEditImage"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="8dp"
            android:layout_marginEnd="8dp"
            android:onClick="onClickChooseImage"
            app:layout_constraintEnd_toEndOf="@+id/imMainImage"
            app:layout_constraintTop_toTopOf="@+id/imMainImage"
            app:srcCompat="@android:drawable/ic_menu_edit" />

    </androidx.constraintlayout.widget.ConstraintLayout>

    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/fbEdit"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginBottom="16dp"
        android:clickable="true"
        android:onClick="onEditEnable"
        app:layout_constraintBottom_toBottomOf="@+id/edDesc"
        app:layout_constraintStart_toStartOf="@+id/edDesc"
        app:srcCompat="@android:drawable/ic_menu_edit" />

</androidx.constraintlayout.widget.ConstraintLayout>

rc_item.xml

<?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"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginStart="3dp"
    android:layout_marginTop="3dp"
    android:layout_marginEnd="3dp"
    android:background="@color/blue_dark">

    <TextView
        android:id="@+id/tvTitle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginTop="10dp"
        android:layout_marginBottom="10dp"
        android:text="TextView"
        android:textColor="@android:color/white"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/tvTime"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="8dp"
        android:layout_marginBottom="8dp"
        android:text="TextView"
        android:textColor="@color/grey2"
        android:textSize="12sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/tvTitle" />
</androidx.constraintlayout.widget.ConstraintLayout>

strings.xml

<resources>
    <string name="app_name">LessonSQLIteKotlin</string>
    <string name="ed_title_hint">Заголовок</string>
    <string name="ed_desc_hint">Описание</string>
</resources>

4 комментария для “SQLite на Kotlin. Урок 10”

Андрей 15 октября, 2022 в 9:48 дп

У вас в EditActivity инициализирована переменная val myDbManager = MyDbManager(this),
а как её же можно инициализировать в фрагменте ?
Пробовал
val myDbManager = MyDbManager(activity as Context)
Приложения крашится и выдает ошибку
null cannot be cast to non-null type android.content.Context

Ответить
1. Ольга 13 августа, 2023 в 2:30 пп
  
  Из фрагмента: val myDbManager = MyDbManager(requireContext())
  
  Ответить
Александр 13 января, 2024 в 9:17 дп

Урок № 6.
После добавлении строки val dataId = cursor?.getInt(cursor.getColumnIndex(BaseColumns._ID))
приложение крашится. Проверял дебагом. Что не так? Как исправить?

Ответить
Александр 13 января, 2024 в 9:19 дп

Это в функции ReadData()

Ответить

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