我想在Kotlin
中執行網絡操作異步。我讀過它,你可以使用async
函數做異步。我得到錯誤以下,任何人都可以猜測可能是什麼問題?Kotlin中的未解決的參考異步
未解決的參考:異步
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
async() {
val forecastWeather = ForecastRequest("302015").execute()
Log.d("Test", forecastWeather.toString())
}
}
ForecastRequest.kt
class ForecastRequest(val zipcode: String) {
companion object {
private val APP_ID = "XYZ"
private val URL = "http://api.openweathermap.org/data/2.5/" +
"forecast/daily?mode=json&units=metric&cnt=7"
private val COMPLETE_URL = "$URL&APPID=$APP_ID&q="
}
fun execute(): ForecastResponse {
val forecastJsonStr = java.net.URL(COMPLETE_URL + zipcode).readText()
return Gson().fromJson(forecastJsonStr, ForecastResponse::class.java)
}
}
頂級的build.gradle
// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
ext.kotlin_version = '1.1.2-4'
repositories {
maven { url 'https://maven.google.com' }
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:3.0.0-alpha2'
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
maven { url 'https://maven.google.com' }
jcenter()
mavenCentral()
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}
模塊級的build.gradle
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
android {
compileSdkVersion 25
buildToolsVersion "25.0.2"
defaultConfig {
applicationId "com.williams.thirddemo"
minSdkVersion 23
targetSdkVersion 25
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
compile 'com.android.support:appcompat-v7:25.3.1'
testCompile 'junit:junit:4.12'
compile 'com.android.support.constraint:constraint-layout:1.0.2'
compile 'com.google.code.gson:gson:2.8.1'
}
你不小心(?)發佈您的APP_ID這裏。你應該現在禁用它並獲得一個新的API,除非這個API也需要一個API祕密。 –
@ChristianBrüggemann啊,刪除:) –
@Williams它仍然在歷史上的問題的變化日誌,所以改變它,如果你不想要一些非法使用你的APP_ID –