内容简介:Kotlin for Android(四)Retrofit + RxJava
如果您之前学习 Android MVP ,很可能是从 AndroidMVPSample
( https://github.com/WuXiaolong/AndroidMVPSample )开始的,此Sample最初是 Android MVP 示例,后来融合 Retrofit 和 RxJava,分别演示了普通写法(Retrofit)、普通写法(Retrofit+Rxjava)、MVP+Retrofit+Rxjava,跟它一样,我写了Kotlin 版 Retrofit +RxJava 来练手,还是以天气示例。
依赖
build.gradle
buildscript { ext.kotlin_version = '1.1.2-4' ext.retrofit_version = '2.0.2' ext.rxkotlin_version = '0.60.0' ext.rxandroid_version = '1.2.1' dependencies { classpath 'com.android.tools.build:gradle:2.3.1' //编译 Kotlin 源代码和模块. classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version" } }
app/build.gradle
apply plugin: 'com.android.application' apply plugin: 'kotlin-android' android { //…… } dependencies { //针对 JDK 7 或 JDK 8 compile "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version" //Retrofit compile "com.squareup.retrofit2:retrofit:$retrofit_version" compile "com.squareup.okhttp3:logging-interceptor:$logging_interceptor_version" compile "com.squareup.retrofit2:converter-gson:$retrofit_version" compile "com.squareup.retrofit2:adapter-rxjava:$retrofit_version" //RxJava compile "io.reactivex:rxkotlin:$rxkotlin_version" compile "io.reactivex:rxandroid:$rxandroid_version" }
网络权限
AndroidManifest.xml
<uses-permissionandroid:name="android.permission.INTERNET"/>
WeatherinfoModel
天气接口: http://www.weather.com.cn/adat/sk/101190201.html
当我们使用 Gson 来解析 json 到我们的类中,这些属性的名字必须要与json中的名字一样,哎,我又忘记这点,因此浪费了很多时间排错。
data class WeatherinfoModelconstructor(val weatherinfo: WeatherinfoBean) { data class WeatherinfoBean( val city: String, val cityid: String ) }
ApiStores
网络请求 url 都放这里:
interface ApiStores{ companion object { //baseUrl val API_SERVER_URL = "http://www.weather.com.cn/" } //加载天气 @GET("adat/sk/{cityId}.html") fun loadData(@Path("cityId")cityId:String): Observable<WeatherinfoModel> }
ApiClient
Retrofit 初始化、配置:
//object声明单例模式 object ApiClient { fun retrofit(): ApiStores { val builder = OkHttpClient.Builder() if (BuildConfig.DEBUG) { // Log信息拦截器 val loggingInterceptor = HttpLoggingInterceptor() loggingInterceptor.level = HttpLoggingInterceptor.Level.BODY //设置 Debug Log 模式 builder.addInterceptor(loggingInterceptor) } val okHttpClient = builder.build() val retrofit = Retrofit.Builder() .baseUrl(ApiStores.API_SERVER_URL) .addConverterFactory(GsonConverterFactory.create()) .addCallAdapterFactory(RxJavaCallAdapterFactory.create()) .client(okHttpClient) .build() //ApiStores::class.java取得对象的 Java 类 return retrofit.create(ApiStores::class.java) } }
ApiCallback
还是做了回调:
abstract class ApiCallback<M> :Subscriber<M>() { abstract fun onSuccess(model:M) abstract fun onFailure(msg:String?) abstract fun onFinish() override fun onCompleted() { onFinish() } override fun onNext(m:M) { onSuccess(m) } override fun onError(e:Throwable?) { //这块应该可以优化 if (e is HttpException) { val httpException = e //httpException.response().errorBody().string() val code = httpException.code() var msg = httpException.message Log.d("wxl", "code=" + code) if (code == 504) { msg = "网络不给力" } if (code == 502 || code == 404) { msg = "服务器异常,请稍后再试" } onFailure(msg) } else { onFailure(e.toString()) } onFinish() } }
BaseActivity
建了基类,可以把一些公用的方法放到这里,方便:
open class BaseActivity:AppCompatActivity() { val mCompositeSubscription: CompositeSubscription = CompositeSubscription() override fun onCreate(savedInstanceState:Bundle?) { super.onCreate(savedInstanceState) } override fun onDestroy() { if (mCompositeSubscription.hasSubscriptions()) { //取消注册,以避免内存泄露 mCompositeSubscription.unsubscribe() } super.onDestroy() } open fun <M>addSubscription(observable:Observable<M>, subscriber:Subscriber<M>) { mCompositeSubscription.add( observable.subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribe(subscriber)) } }
MainActivity
请求接口:
//冒号表示继承 class MainActivity:BaseActivity() { //问号表示该变量可以为空 override fun onCreate(savedInstanceState:Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) //object为对象表达式 addSubscription(ApiClient.retrofit().loadData("101190201"), object : ApiCallback<WeatherinfoModel>() { override fun onSuccess(model:WeatherinfoModel) { Log.d("wxl", "city=" + model.weatherinfo.city + ",cityid=" + model.weatherinfo.cityid)//输出“city=无锡,cityid=101190201” } override fun onFailure(msg:String?) { Log.d("wxl", "onFailure=" + msg) } override fun onFinish() { Log.d("wxl", "onFinish") } }) } }
以上所述就是小编给大家介绍的《Kotlin for Android(四)Retrofit + RxJava》,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对 码农网 的支持!
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