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目標(biāo)

采用Retrofit,發(fā)送單個(gè)或多個(gè)網(wǎng)絡(luò)請(qǐng)求(串行),并更新UI.

實(shí)現(xiàn)方案

發(fā)送單個(gè)網(wǎng)絡(luò)請(qǐng)求方案

1. 修改app工程的build.gradle文件

• 在android節(jié)點(diǎn)下添加如下信息

compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
}

• 添加依賴

implementation 'com.squareup.retrofit2:retrofit:2.7.2'
implementation 'com.squareup.retrofit2:converter-gson:2.7.2'

2. 定義數(shù)據(jù)類Task.kt

data class Task(val id: Int, var name: String)

3. 創(chuàng)建網(wǎng)絡(luò)接口類NetworkService.kt

interface NetworkService {
    @GET("cxyzy1/AndroidAsyncTaskDemo/raw/master/data.json")
    fun query(): Call<Task>
}

4. 創(chuàng)建網(wǎng)絡(luò)工具類NetworkUtils.kt

fun getNetworkService(): NetworkService {
    val okHttpClient = OkHttpClient.Builder().build()
    val retrofit = Retrofit.Builder()
        .client(okHttpClient)
        .baseUrl("https://gitee.com/")
        .addConverterFactory(GsonConverterFactory.create())
        .build()

    return retrofit.create(NetworkService::class.java)
}

5. activity調(diào)用

private fun queryData() {
    val networkService = getNetworkService()
    val call = networkService.query()
    call.enqueue(object : Callback<Task?> {
        override fun onResponse(call: Call<Task?>?, response: Response<Task?>) {
            val bean: Task? = response.body()
            contentTv.text = bean?.name
        }

        override fun onFailure(call: Call<Task?>?, t: Throwable) {
            Log.e("MainActivity", "網(wǎng)絡(luò)請(qǐng)求失敗:" + t.message)
        }
    })
}

發(fā)送兩個(gè)網(wǎng)絡(luò)請(qǐng)求方案

1. 修改app工程的build.gradle文件,同上
2. 定義數(shù)據(jù)類Task.kt,同上
3. 創(chuàng)建網(wǎng)絡(luò)接口類NetworkService.kt

interface NetworkService {
    @GET("cxyzy1/AndroidAsyncTaskDemo/raw/master/data.json")
    fun query(): Call<Task>

    @GET("cxyzy1/AndroidAsyncTaskDemo/raw/master/data2.json")
    fun query2():  Call<Task>
}

4. 創(chuàng)建網(wǎng)絡(luò)工具類NetworkUtils.kt,同上
5. activity調(diào)用

private fun queryData() {
    val networkService = getNetworkService()
    val call = networkService.query()
    call.enqueue(object : Callback<Task?> {
        override fun onResponse(call: Call<Task?>?, response: Response<Task?>) {
            val bean: Task? = response.body()
            contentTv.text = bean?.name
            queryData2()
        }

        override fun onFailure(call: Call<Task?>?, t: Throwable) {
            Log.e("MainActivity", "網(wǎng)絡(luò)請(qǐng)求失敗:" + t.message)
        }
    })
}

private fun queryData2() {
    val networkService = getNetworkService()
    val call = networkService.query2()
    call.enqueue(object : Callback<Task?> {
        override fun onResponse(call: Call<Task?>?, response: Response<Task?>) {
            val bean: Task? = response.body()
            contentTv2.text = bean?.name
        }

        override fun onFailure(call: Call<Task?>?, t: Throwable) {
            Log.e("MainActivity", "網(wǎng)絡(luò)請(qǐng)求失敗:" + t.message)
        }
    })
}

代碼說明:
queryData訪問query接口完畢后,通過調(diào)用queryData2訪問query2接口.

完整源代碼

https://gitee.com/cxyzy1/AndroidAsyncTaskDemo/tree/master/retrofitDemo