改造响应问题答案

【问题标题】：Issue with Retrofit Response改造响应问题
【发布时间】：2019-08-27 01:24:36
【问题描述】：

我正在尝试通过 Retrofit 获取状态列表并尝试添加 Searchable Spinner。

我得到了什么：

我正在获取响应状态列表。

我可以在 Spinner 中访问一种状态。我想要什么：

我想在 Spinner 中访问多个状态。

代码：

getMainApp().electAPI.getStates().enqueue(object : Callback<Responseval>{
            override fun onFailure(call: Call<Responseval>, t: Throwable) {
                Toast.makeText(this@MainActivity, t?.message, Toast.LENGTH_SHORT)
            }

            override fun onResponse(call: Call<Responseval>, response: Response<Responseval>) {
                if (response.isSuccessful!!){
                    val states = response.body()?.data
                    val stateArray = arrayListOf<String>(states?.get(0)!!.name)// Problem occur here i need to put value to get state
                    val spinner = findViewById<Spinner>(R.id.spinner)
                    val adapter = ArrayAdapter<String>(this@MainActivity, android.R.layout.simple_spinner_item, stateArray)
                    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item)
                    spinner.adapter = adapter
                    val options = stateArray
                    spinner.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {
                        override fun onItemSelected(parent: AdapterView<*>, view: View, position: Int, id: Long) {
                            Toast.makeText(this@MainActivity, " You select >> "+options[position], Toast.LENGTH_SHORT).show();
                        }

                        override fun onNothingSelected(parent: AdapterView<*>) {

                            // sometimes you need nothing here
                        }
                    }
                }
            }

        })

宝可梦：

data class Responseval(val `data`: List<Data>, val message: String, val success: Boolean)

data class Data(val created_at: String, val id: Int, val name: String, val status: Int, val updated_at: String)

【问题讨论】：

您需要发布 json 响应
添加先生@SantanuSur
这只是因为 arrayListOf(states?.get(0)!!.name)。您刚刚获得了该州的名字。
是的，我想要所有的州名

标签： android kotlin retrofit2 spinner

【解决方案1】：

你可以使用这样的循环。

getMainApp().electAPI.getStates().enqueue(object : Callback<Responseval>{
            override fun onFailure(call: Call<Responseval>, t: Throwable) {
                Toast.makeText(this@MainActivity, t?.message, Toast.LENGTH_SHORT)
            }

            override fun onResponse(call: Call<Responseval>, response: Response<Responseval>) {
                if (response.isSuccessful!!){
                    val states = response.body()?.data
                    var stateArray = arrayListOf<String>
                    for(i = 0; i<response.body.data.size; i++){
                        stateArray.add(response.body.data.get(i).name)
                    }
                    val spinner = findViewById<Spinner>(R.id.spinner)
                    val adapter = ArrayAdapter<String>(this@MainActivity, android.R.layout.simple_spinner_item, stateArray)
                    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item)
                    spinner.adapter = adapter
                    val options = stateArray
                    spinner.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {
                        override fun onItemSelected(parent: AdapterView<*>, view: View, position: Int, id: Long) {
                            Toast.makeText(this@MainActivity, " You select >> "+options[position], Toast.LENGTH_SHORT).show();
                        }

                        override fun onNothingSelected(parent: AdapterView<*>) {

                            // sometimes you need nothing here
                        }
                    }
                }
            }

        })

kotlin 中的 for 循环

for (i in 0..(response.body.data.size-1)) {
        stateArray.add(response.body.data.get(i).name)
    }

【讨论】：

【解决方案2】：

getMainApp().electAPI.getStates().enqueue(object : Callback<Responseval>{
        override fun onFailure(call: Call<Responseval>, t: Throwable) {
            Toast.makeText(this@MainActivity, t?.message, Toast.LENGTH_SHORT)
        }

        override fun onResponse(call: Call<Responseval>, response: Response<Responseval>) {
            if (response.isSuccessful!!){
                val states = response.body()?.data
                val stateArray = Array<String>(states.size())
for(int i=0;i<sates.size();i++)
{
    stateArray[i]=sates.get(i).name;

    if(i == (sates.size() -1) )
    {
     val spinner = findViewById<Spinner>(R.id.spinner)
                val adapter = ArrayAdapter<String>(this@MainActivity, android.R.layout.simple_spinner_item, stateArray)
                adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item)
                spinner.adapter = adapter
                val options = stateArray
                spinner.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {
                    override fun onItemSelected(parent: AdapterView<*>, view: View, position: Int, id: Long) {
                        Toast.makeText(this@MainActivity, " You select >> "+options[position], Toast.LENGTH_SHORT).show();
                    }

                    override fun onNothingSelected(parent: AdapterView<*>) {

                        // sometimes you need nothing here
                    }
                }
            }
    }
}
        }

    })

您只是访问列表中的第一个位置，这就是微调器仅显示一个选项的原因。

快乐编码...

【讨论】：

【解决方案3】：

此方法将在数组中快速添加项目

getMainApp().electAPI.getStates().enqueue(object : Callback<Responseval>{
            override fun onFailure(call: Call<Responseval>, t: Throwable) {
                Toast.makeText(this@MainActivity, t?.message, Toast.LENGTH_SHORT)
            }

            override fun onResponse(call: Call<Responseval>, response: Response<Responseval>) {
                if (response.isSuccessful!!){
                    val states = response.body()?.data
                    var stateArray = arrayListOf<String>
                    for(state in states){
                        stateArray.add(states.get(i).name)
                    }
                    val spinner = findViewById<Spinner>(R.id.spinner)
                    val adapter = ArrayAdapter<String>(this@MainActivity, android.R.layout.simple_spinner_item, stateArray)
                    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item)
                    spinner.adapter = adapter
                    val options = stateArray
                    spinner.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {
                        override fun onItemSelected(parent: AdapterView<*>, view: View, position: Int, id: Long) {
                            Toast.makeText(this@MainActivity, " You select >> "+options[position], Toast.LENGTH_SHORT).show();
                        }

                        override fun onNothingSelected(parent: AdapterView<*>) {

                            // sometimes you need nothing here
                        }
                    }
                }
            }

        })

【讨论】：