Android序列化实现接口Serializable与Parcelable详解

class Person : Serializable {
    var name = ""
    var age = 0
}
//传递
OneActivity {
    val person = Person().apply {
        name = "张三"
        age = 18
    }
    Intent(this, TwoActivity::class.java).also {
        it.putExtra("person", person)
        startActivity(it)
    }
}
//获取
TwoActivity {
    val person = intent.getSerializableExtra("person") as Person    //反序列化成对象
}

class Person() : Parcelable {
    var name = ""
    var age = 0
    constructor(parcel: Parcel) : this() {
        //读出
        name = parcel.readString() ?: ""
        age = parcel.readInt()
    }
    //写入
    override fun writeToParcel(parcel: Parcel, flags: Int) {
        parcel.writeString(name)
        parcel.writeInt(age)
    }
    //返回0就行
    override fun describeContents(): Int {
        return 0
    }
    //伴生对象实现接口
    companion object CREATOR : Parcelable.Creator<Person> {
        //返回对象
        override fun createFromParcel(parcel: Parcel): Person {
            return Person(parcel)
        }
        //返回一个数组，形参 size 作为数组大小
        override fun newArray(size: Int): Array<Person?> {
            return arrayOfNulls(size)
        }
    }
}
//传递方式和 Serializable 一样，使用如下：
TwoActivity {
    val person = intent.getParcelableExtra("person")
}

//Module Gradle 引入插件
plugins {
    id 'kotlin-parcelize'
}
//使用
@Parcelize
class Person(val name: String, var age: Int) : Parcelable