适用于 Kotlin 的 Android Parcelable 无法正常工作

Question

我正在尝试将数据从一个 fragment 传递到另一个 fragment ，但我遇到了将数据从一个 fragment 发送到另一个 fragment 的问题。

 class MainFragment : Fragment() {


    companion object {
        public val KEY_PARSE_DATA = "parseData"
    }

    private var parseData: ParseData? = null

    override fun onCreateView(inflater: LayoutInflater?, container: ViewGroup?,
                              savedInstanceState: Bundle?): View? {
        // Inflate the layout for this fragment
        return inflater!!.inflate(R.layout.fragment_main, container, false).apply {
            val editName = findViewById(R.id.edit_Name) as EditText
            val editSurname = findViewById(R.id.edit_Surname) as EditText
            val buttonNext = findViewById(R.id.btn_Next) as Button
            buttonNext.setOnClickListener(View.OnClickListener {
                val fragment = AnotherFragment()

                if (parseData != null) {
                    var parseData = ParseData(editName.text.toString(), editSurname.text.toString())
                    val fragment = AnotherFragment()
                    val bundle = Bundle()
                    bundle.putParcelable(KEY_PARSE_DATA, parseData)
                    fragment.setArguments(bundle)
                    fragmentManager.beginTransaction().add(R.id.fragment_container, fragment).commitAllowingStateLoss()

                }

            })
        }
    }


}// Required empty public constructor

实现它的Parcelable类

 @SuppressLint("ParcelCreator")
@Parcelize
data class ParseData(val firstName: String, val lastName: String) : Parcelable {


    constructor(parcel: Parcel) : this(
            parcel.readString(),
            parcel.readString()) {
    }

    override fun toString(): String {
        return "ParseData(firstName='$firstName', lastName='$lastName')"
    }


    companion object : Parceler<ParseData> {

        override fun ParseData.write(parcel: Parcel, flags: Int) {
            parcel.writeString(firstName)
            parcel.writeString(lastName)
        }

        override fun create(parcel: Parcel): ParseData {
            return ParseData(parcel)
        }
    }
}

还有另一个从android中的parcelable类中获取数据的 fragment

    class AnotherFragment : Fragment() {

    override fun onCreateView(inflater: LayoutInflater?, container: ViewGroup?,
                              savedInstanceState: Bundle?): View? {
        // Inflate the layout for this fragment
        return inflater!!.inflate(R.layout.fragment_another, container, false).apply {

            val textName = findViewById<TextView>(R.id.textFirst)
            val textSurname = findViewById<TextView>(R.id.textSecond)
            val bundle = arguments
            if (bundle != null) {
                val parseData = bundle.getParcelable<ParseData>(KEY_PARSE_DATA)
                textName.setText(parseData.firstName)
                textSurname.setText(parseData.lastName)
            }
        }
    }

}

我尝试了一些例子，但我不清楚如何在基于 kotlin 和 build.gradle 文件的 andoid 应用程序中实现 parcelable

 apply plugin: 'com.android.application'

apply plugin: 'kotlin-android'

apply plugin: 'kotlin-android-extensions'

android {
    compileSdkVersion 26
    defaultConfig {
        applicationId "com.assignment.ankitt.kotlinsecond"
        minSdkVersion 19
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

androidExtensions {
    experimental = true
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
    implementation 'com.android.support:appcompat-v7:26.1.0'
    implementation 'com.android.support.constraint:constraint-layout:1.0.2'
    implementation 'com.android.support:support-v4:26.1.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.1'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
}

Answer 1

将以下代码添加到您的应用级 gradle。

apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
apply plugin: 'kotlin-kapt'

androidExtensions {
    experimental = true
}