Android Kotlin - Parcelable을 사용한 Intent

Parcelable을 사용한 Intent

• Library 없이 Parcelable 사용

  • activity_intent.xml

    <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout
        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"
        android:orientation="vertical"
        tools:context=".IntentActivity">
        <TextView android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/name"
            android:textSize="30sp"/>
        <TextView android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/age"
            android:textSize="30sp"/>
        <ListView android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/listView"/>
        <ListView android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/mapListView"/>
    </LinearLayout>
  

  • activity_main.xml

    <?xml version="1.0" encoding="utf-8"?>
    <android.support.constraint.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:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Hello World!"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toTopOf="parent"/>
    </android.support.constraint.ConstraintLayout>
  

  • Person

    class Person : Parcelable {
        var name: String? = null
        var age: Int = 0
        var favoriteFoodList: ArrayList<String> = ArrayList()
        var map: HashMap<String, Boolean> = HashMap()
  
        constructor(name: String, age: Int, favoriteFoodList: ArrayList<String>, map: HashMap<String, Boolean>) {
            this.name = name
            this.age = age
            this.favoriteFoodList = favoriteFoodList
            this.map = map
        }
  
        constructor(src: Parcel) {
            this.name = src.readString()
            this.age = src.readInt()
            src.readStringList(favoriteFoodList) // List를 read parcel
            this.map = buildTheMap(src) // Map을 read parcel 
        }
  
        fun buildTheMap(parcel: Parcel): HashMap<String, Boolean> {
            val size = parcel.readInt()
            val map = HashMap<String, Boolean>()
  
            for (i in 1..size) {
                val key = parcel.readString()
                val value = parcel.readInt() == 1
                map[key] = value
            }
            return map
        }
  
        override fun writeToParcel(dest: Parcel, flags: Int) {
            dest.writeString(name)
            dest.writeInt(age)
            dest.writeStringList(favoriteFoodList)  // List를 write parcel
  
            dest.writeInt(map.size) // Map을 write parcel 
            for ((key, value) in map) {
                dest.writeString(key)
                dest.writeInt(if (value) 1 else 0)
            }
        }
  
        override fun describeContents(): Int {
            return 0
        }
  
        companion object {
            @JvmField
            val CREATOR: Parcelable.Creator<Person> = object : Parcelable.Creator<Person> {
                override fun createFromParcel(src: Parcel): Person {
                    return Person(src)
                }
                override fun newArray(size: Int): Array<Person?> {
                    return arrayOfNulls(size)
                }
            }
        }
    }
  

  • IntentActivity

    class IntentActivity : AppCompatActivity() {
        override fun onCreate(savedInstanceState: Bundle?) {
            super.onCreate(savedInstanceState)
            setContentView(R.layout.activity_intent)
  
            val person = intent.getParcelableExtra<Person>("person")
            name.text=person.name
            age.text=person.age.toString()
  
            val adapter = ArrayAdapter(this,android.R.layout.simple_list_item_1,person.favoriteFoodList)
            listView.adapter=adapter
  
            var list = mutableListOf<HashMap<String,String>>()
            for(i in person.map){
                var hashMap = HashMap<String,String>()
                hashMap["id"]=i.key
                hashMap["password"]=i.value.toString()
                list.add(hashMap)
            }
            val mapAdapter = SimpleAdapter(this,list,android.R.layout.simple_list_item_2, arrayOf("id","password"),
                        intArrayOf(android.R.id.text1,android.R.id.text2))
            mapListView.adapter=mapAdapter
        }
    }
  

  • MainActivity

    class MainActivity : AppCompatActivity() {
        override fun onCreate(savedInstanceState: Bundle?) {
            super.onCreate(savedInstanceState)
            setContentView(R.layout.activity_main)
            var list = arrayListOf("치킨","피자","과일")
            var hashMap = hashMapOf("A" to false,"B" to true,"C" to false,"D" to true)
            var person = Person("KKK",15,list,hashMap)
            val intent = Intent(this,IntentActivity::class.java)
            intent.putExtra("person",person)
            startActivity(intent)
        }
    }
  

• Library 사용

  • Library 추가

    androidExtensions{
        experimental = true
    }
  

  app 수준의 gradle에 추가

  • Person 수정

    @Parcelize
    class Person (var name: String? = null,
        var age: Int = 0,
        var favoriteFoodList: ArrayList<String> = ArrayList(),
        var map :HashMap<String,String> = HashMap()): Parcelable
  

  60 line -> 6 line