質問編集履歴
1
抜粋コードを削除し、全体コードを載せました
test
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test
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package com.komugi.haiga.samplesqlite
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import android.support.v7.app.AppCompatActivity
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import android.os.Bundle
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@@ -62,15 +66,55 @@
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val listView = findViewById<ListView>(R.id.listView)
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listView.adapter = ArrayAdapter<String>(this, R.layout.list_text_row, R.id.textView, texts)
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listView.adapter = ArrayAdapter<MutableList<String>>(this, R.layout.list_text_row, R.id.textView, texts)
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}
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}
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val button = findViewById<Button>(R.id.button)
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button.setOnClickListener {
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val editText = findViewById<EditText>(R.id.editText)
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insertText(this, editText.text.toString())
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show()
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}
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val buttonDelete = findViewById<Button>(R.id.button_delete)
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buttonDelete.setOnClickListener {
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//全削除する前に確認する
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AlertDialog.Builder(this)
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.setTitle("全削除")
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.setMessage("全削除します")
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.setNegativeButton("Cancel", null)
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.setPositiveButton("OK") { _, _ ->
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//データベースを全削除する
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deleteText(this)
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show()
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}.show()
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}
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val adapter = ArrayAdapter<String>(this, R.layout.list_text_row, R.id.textView)
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selectedList.adapter = adapter
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selectedList.setOnItemClickListener { _, _,
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selectedList.setOnItemClickListener { _, _, position, _ ->
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AlertDialog.Builder(this)
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.setPositiveButton("OK") {_, _ ->
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deleteItem(this)
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deleteItem(this, ids[position])
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show()
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```
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```
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package com.komugi.haiga.samplesqlite
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import android.content.ContentValues
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import android.content.Context
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@@ -128,12 +170,6 @@
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import android.database.sqlite.SQLiteOpenHelper
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import java.nio.file.Files.delete
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fun queryTexts(context: Context) : Array<MutableList<String>> {
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//読み込み用のデータベースを開く
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val database = SampleDatabaseOpenHelper(context).readableDatabase
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//データベースから全件検索する
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val cursor = database.query("texts", null, null, null, null, null,"created_at DESC")
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val texts = mutableListOf<String>()
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val ids = mutableListOf<String>()
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cursor.use {
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//カーソルで順次処理していく
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while(cursor.moveToNext()) {
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//保存されているテキストを得る
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val text = cursor.getString(cursor.getColumnIndex("text"))
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val id = cursor.getString(cursor.getColumnIndex("id"))
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texts.add(text)
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ids.add(id)
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}
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}
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val resArray = arrayOf(texts)
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database.close()
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return resArray
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}
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fun insertText(context: Context, text: String) {
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//書き込み可能なデータベースを開く
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val database = SampleDatabaseOpenHelper(context).writableDatabase
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database.use { db ->
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//挿入するレコード
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val record = ContentValues().apply {
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put("text", text)
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}
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//データベースに挿入する
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db.insert("texts", null, record)
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}
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}
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//データベース全削除機能
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fun deleteText(context: Context) {
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val database = SampleDatabaseOpenHelper(context).writableDatabase
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database.use { db ->
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db.delete("texts", null, null)
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}
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}
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//データベース選択削除機能
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fun deleteItem(context: Context) {
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fun deleteItem(context: Context, id: String) {
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val database = SampleDatabaseOpenHelper(context).writableDatabase
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database.use { db ->
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db.delete("texts", "id =
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db.delete("texts", "id =" + id, null)
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}
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db?.execSQL("CREATE TABLE texts ( " +
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" id
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" id INTEGER PRIMARY KEY AUTOINCREMENT, "+
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" text TEXT NOT NULL, " +
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```
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