JSON

 

 

JSON을 읽어와서 화면에 띄워보자

 

 

1. app - src - main - assets경로 생성&우클릭 - 새로만들기 - 파일 - data.json이름의 파일 생성

data.json

[
  {
    "id": "kotlin",
    "language": "코틀린"
  },
  {
    "id": "java",
    "language": "자바"
  },
  {
    "id": "swift",
    "language": "스위프트"
  }
]

 

2. activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".MainActivity">
    <TextView
            android:id="@+id/textView"
            android:layout_width="379dp"
            android:layout_height="195dp"
            android:text=""
            android:textSize="20sp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toTopOf="parent" app:layout_constraintHorizontal_bias="0.502"/>

</androidx.constraintlayout.widget.ConstraintLayout>

 

3. MainActivity.kt

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        // 문자열
        val jsonStr = assets.open("data.json").reader().readText()
        Log.d("jsonStr", jsonStr)

        // Json으로 파싱
        val jsonArray = JSONArray(jsonStr)
        Log.d("jsonStr", jsonArray.toString())

        val textView = findViewById<TextView>(R.id.textView)

        for (i in 0 until jsonArray.length()){
            val jsonObject = jsonArray.getJSONObject(i)

            textView.append("\n---------------------\n")

            val id = jsonObject.getString("id")
            val language = jsonObject.getString("language")

            textView.append(
                """
                    $id
                """.trimIndent()
            )
            textView.append(
                """
                    $language
                """.trimIndent()
            )
        }
    }
}

 

결과물