使用改造和视图模型的旋转器价值

分类：编程问答

如何解决使用改造和视图模型的旋转器价值

我正在尝试在我的项目中实现编辑购物车。.为此我使用了微调器

我发布了两种使用viewmodel的方法，一种是不使用viewmodel的方法

不使用viewmodel可以很好地解决使用viewmodel留下的问题

不使用viewmodel即可正常工作

使用viewmodel

适配器：: ---------- 

var country = arrayOf(1,2,3,4,5,6,7,8)
/***  */
val aa: ArrayAdapter <*> =
        ArrayAdapter<Any?>(context,android.R.layout.simple_spinner_item,country)
aa.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item)
holder.spin.setAdapter(aa)
holder.spin.setSelection(dataList?.get(position)?.quantity!! - 1,false)
holder.spin.setOnItemSelectedListener(object : OnItemSelectedListener {
    override fun onItemSelected(
            parent: AdapterView<*>,view: View,position1: Int,id: Long
    ) {
        progressDialog.show()
        val id = dataList?.get(position)!!.product.id
        itemClick?.EditItem(position1,id!!.toInt())
    }
    override fun onNothingSelected(parent: AdapterView<*>?) {
        // todo for nothing selected
    }
})

接口：： ----- 

interface OnItemClick {
    fun DeleteItem(position: Int,id:Int)
    fun EditItem(position: Int,id: Int)
}

活动：： ---- 

var country = arrayOf(1,8)

/* */
override fun EditItem(position: Int,id: Int) {
    val token: String = SharedPrefManager.getInstance(applicationContext).user.access_token.toString()
    RetrofitClient.instance.editCart(token,id,arrayOf(country[position]))
            .enqueue(object : Callback<DeleteResponse> {
                override fun onFailure(call: Call<DeleteResponse>,t: Throwable) {
                    Log.d("res","" + t)
                }

                override fun onResponse(call: Call<DeleteResponse>,response: Response<DeleteResponse>) {
                    progressDialog?.dismiss()
                    finish()
                    var res = response
                    if (res.isSuccessful) {
                        Toast.makeText(applicationContext,res.body()?.user_msg,Toast.LENGTH_LONG).show()
                        progressDialog?.dismiss()
                        val intent = Intent(applicationContext,AddToCart::class.java)
                        intent.flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_MULTIPLE_TASK
                        applicationContext.startActivity(intent)
                        overridePendingTransition(0,0)
                        Log.d("kjsfgxhufb",response.body()?.user_msg.toString())
                    } else {
                        try {
                            val jObjError = JSONObject(response.errorBody()!!.string())
                            Toast.makeText(applicationContext,jObjError.getString("message") + jObjError.getString("user_msg"),Toast.LENGTH_LONG).show()
                        } catch (e: Exception) {
                            Toast.makeText(applicationContext,e.message,Toast.LENGTH_LONG).show()
                            Log.e("errorrr",e.message)
                        }
                    }
                }
            })
}

Api ：： -------- 

@FormUrlEncoded
@POST("editCart")
fun editCart(
        @Header("access_token") token: String,@Field("product_id") product_id: Int,@Field("quantity") quantity: Array<Int>
): Call<DeleteResponse>

以上代码在没有实现ViewModel的情况下仍在工作...正在对其进行编辑并获得成功响应

使用viewmodel实现

视图模型：： ------- 

class CartViewModel(context: Application,savedStateHandle: SavedStateHandle) :
AndroidViewModel(context) {
///   val product_id:String?=null

sealed class Result {
    object Missing : Result()

    object NetworkFailure : Result()

    object Success : Result()
}

val product_id: MutableLiveData<String> = savedStateHandle.getLiveData("product_id","")

var country =
    arrayOf(1,8)

private var Cart: MutableLiveData<CartResponse>? = null

val CartList: MutableLiveData<CartResponse>?
    get() {

        if (Cart == null) {
            Cart = MutableLiveData<CartResponse>()
            loadCartList()
        }
        return Cart
    }

private val loginResultEmitter = EventEmitter<CartViewModel.Result>()
val Results: EventSource<CartViewModel.Result> = loginResultEmitter
private fun loadCartList() {

    val token: String =
        SharedPrefManager.getInstance(
            getApplication()
        ).user.access_token.toString()
    RetrofitClient.instance.listcart(token).enqueue(object :
        Callback<CartResponse> {
        override fun onFailure(call: Call<CartResponse>,t: Throwable) {
            Toast.makeText(getApplication(),"falied",Toast.LENGTH_LONG).show()
        }

        override fun onResponse(
            call: Call<CartResponse>,response: Response<CartResponse>
        ) {

            if (response.isSuccessful) {

                Cart!!.value = response.body()

            }
        }

    })

}

fun loaddelete() {
    val id = product_id.value!!.toString().trim()

    val token: String =
        SharedPrefManager.getInstance(getApplication()).user.access_token.toString()
    RetrofitClient.instance.deletecart(token,id)
        .enqueue(object : Callback<DeleteResponse> {
            override fun onFailure(call: Call<DeleteResponse>,t: Throwable) {
                loginResultEmitter.emit(CartViewModel.Result.NetworkFailure)

                Log.d("res","" + t)


            }

            override fun onResponse(
                call: Call<DeleteResponse>,response: Response<DeleteResponse>
            ) {
                var res = response


                if (res.body()?.status == 200) {
                    Toast.makeText(
                        getApplication(),res.body()?.message,Toast.LENGTH_LONG
                    ).show()


                    loginResultEmitter.emit(CartViewModel.Result.Success)


                } else {
                    try {
                        val jObjError =
                            JSONObject(response.errorBody()!!.string())
                        Toast.makeText(
                            getApplication(),Toast.LENGTH_LONG
                        ).show()
                    } catch (e: Exception) {
                        Toast.makeText(getApplication(),Toast.LENGTH_LONG).show()
                        Log.e("errorrr",e.message)
                    }
                }
            }
        })


}

fun loadEdit() {
    val id = product_id.value!!.toString().trim()
    val token: String =
        SharedPrefManager.getInstance(getApplication()).user.access_token.toString()
    RetrofitClient.instance.editCart(token,id.toInt(),country)
        .enqueue(object : Callback<DeleteResponse> {
            override fun onFailure(call: Call<DeleteResponse>,t: Throwable) {
                Log.d("res","" + t)
            }

            override fun onResponse(
                call: Call<DeleteResponse>,response: Response<DeleteResponse>
            ) {
                var res = response
                if (res.isSuccessful) {
                    Toast.makeText(getApplication(),Toast.LENGTH_LONG)
                        .show()
                } else {
                    try {
                        val jObjError = JSONObject(response.errorBody()!!.string())
                        Toast.makeText(getApplication(),e.message)
                    }
                }
            }
        })
}

}

活动：： ----- 

class AddToCart : BaseClassActivity(),OnItemClick {
var progressDialog: ProgressDialog? = null
private val viewModel by viewModels<CartViewModel>()
var country =
    arrayOf(1,8)

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.add_to_cart)
    getWindow().setExitTransition(null)
    getWindow().setEnterTransition(null)
    val progressDialog: ProgressDialog = ProgressDialog(applicationContext);

    var mActionBarToolbar = findViewById<androidx.appcompat.widget.Toolbar>(R.id.toolbartable);
    setSupportActionBar(mActionBarToolbar);
    // add back arrow to toolbar
    setEnabledTitle()

    mActionBarToolbar.setNavigationOnClickListener(View.OnClickListener {
        onBackPressed()
    })
    placeorder.setOnClickListener {
        val intent: Intent = Intent(applicationContext,AddressActivity::class.java)
        startActivity(intent)
    }
    loadCart()
}

fun loadCart() {

    val model = ViewModelProvider(this)[CartViewModel::class.java]

    model.CartList?.observe(this,object : Observer<CartResponse> {
        override fun onChanged(t: CartResponse?) {

            generateDataList(t?.data?.toMutableList())
            totalamount.setText(t?.total.toString())
        }
    })
}

fun generateDataList(dataList: MutableList<DataCart?>?) {
    val recyclerView = findViewById<RecyclerView>(R.id.addtocartrecyleview) as? RecyclerView
    val linear: LinearLayoutManager =
        LinearLayoutManager(applicationContext,LinearLayoutManager.VERTICAL,false)
    recyclerView?.layoutManager = linear
    val adapter = CartAdapter(this@AddToCart,dataList)
    recyclerView?.adapter = adapter
    recyclerView?.addItemDecoration(DividerItemDecorator(resources.getDrawable(R.drawable.divider)))
    // recyclerView?.setHasFixedSize(true)
    adapter.setItemClick(this);

    adapter.notifyDataSetChanged()
    if (dataList?.isEmpty() ?: true) {
        recyclerView?.setVisibility(View.GONE)
        totalamount.setVisibility(View.GONE)
        fl_footer.setVisibility(View.GONE)
        placeorder.setVisibility(View.GONE)
        emptytext.setVisibility(View.VISIBLE)
    } else {
        recyclerView?.setVisibility(View.VISIBLE)
        totalamount.setVisibility(View.VISIBLE)
        fl_footer.setVisibility(View.VISIBLE)
        placeorder.setVisibility(View.VISIBLE)
        emptytext.setVisibility(View.GONE)


    }
    recyclerView?.addOnScrollListener(object :
        RecyclerView.OnScrollListener() {
        override fun onScrollStateChanged(recyclerView: RecyclerView,newState: Int) {
            super.onScrollStateChanged(recyclerView,newState)
            Log.e("RecyclerView","onScrollStateChanged")
        }

        override fun onScrolled(recyclerView: RecyclerView,dx: Int,dy: Int) {
            super.onScrolled(recyclerView,dx,dy)
        }
    })
}

override fun onBackPressed() {
    super.onBackPressed()
    val intent = Intent(this,HomeActivity::class.java)
    startActivity(intent)
}

override fun onOptionsItemSelected(item: MenuItem): Boolean {
    return when (item.itemId) {
        android.R.id.home -> {
            NavUtils.navigateUpFromSameTask(this)

            true
        }
        else -> super.onOptionsItemSelected(item)
    }
}

override fun onResume() {
    super.onResume()
    loadCart()
}


override fun DeleteItem(position: Int,id: Int) {


}

override fun EditItem(position: Int,id: Int) {
    viewModel.product_id.value = id.toString()
    viewModel.loadEdit()
    viewModel.country[position] = country[position]
    viewModel.Results.observe(this) { result ->
        when (result) {
            CartViewModel.Result.Missing -> {
                Toast.makeText(
                    applicationContext,"product is missing",Toast.LENGTH_LONG
                ).show()
            }
            CartViewModel.Result.Success -> {
                finish()
                val intent = Intent(applicationContext,AddToCart::class.java)
                intent.flags =
                    Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_MULTIPLE_TASK
                startActivity(intent)
                overridePendingTransition(0,0)
            }
            else -> {
                Toast.makeText(applicationContext,"hello",Toast.LENGTH_LONG).show()
            }
        }
    }

}

}

从viewmodel的实现中，我获得了成功更新购物车的吐司面包的成功响应，但是当我再次访问购物车时，在旋转器中看到的值为8

例如，如果我将Spinner设置为3，则表明购物车成功更新成功，但是当我再次访问时，在Spinner中看到8，而邮递员在response（json response）中看到8：（

需要微调器中的帮助来设置和发送值以致电感谢

版权声明：本文内容由互联网用户自发贡献，该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请发送邮件至 dio@foxmail.com 举报，一经查实，本站将立刻删除。

相关推荐

导入项目后报错问题
依赖报错 idea导入项目后依赖报错，解决方案：https://blog.csdn.net/weixin_42420249/article/details/81191861 依赖版本报错：更换其他版本 无法下载依赖可参考：https://blog.csdn.net/weixin_42628809/a
idea不能识别yaml文件
使用mybatis plus常见错误
错误1：代码生成器依赖和mybatis依赖冲突 启动项目时报错如下 2021-12-03 13:33:33.927 ERROR 7228 [ main] o.s.b.d.LoggingFailureAnalysisReporter : *************************** APPL
gradle常见问题与错误
错误1：gradle项目控制台输出为乱码 # 解决方案：https://blog.csdn.net/weixin_43501566/article/details/112482302 # 在gradle-wrapper.properties 添加以下内容 org.gradle.jvmargs=-Df
Mybatis Plus传入参数0不起作用
错误还原：在查询的过程中，传入的workType为0时，该条件不起作用 &lt;select id=&quot;xxx&quot;&gt; SELECT di.id, di.name, di.work_type, di.updated... &lt;where&gt; &lt;if test=&qu
linux中make编译源码包失败
报错如下，gcc版本太低 ^ server.c:5346:31: 错误：‘struct redisServer’没有名为‘server_cpulist’的成员 redisSetCpuAffinity(server.server_cpulist); ^ server.c: 在函数‘hasActiveC
微服务启动错误：Command line is too long. Shorten command line for
解决方案1 1、改项目中.idea/workspace.xml配置文件，增加dynamic.classpath参数 2、搜索PropertiesComponent，添加如下 &lt;property name=&quot;dynamic.classpath&quot; value=&quot;tru
vue常见错误
删除根组件app.vue中的默认代码后报错：Module Error (from ./node_modules/eslint-loader/index.js): 解决方案：关闭ESlint代码检测，在项目根目录创建vue.config.js，在文件中添加 module.exports = { lin
spark常见错误
查看spark默认的python版本 [root@master day27]# pyspark /home/software/spark-2.3.4-bin-hadoop2.7/conf/spark-env.sh: line 2: /usr/local/hadoop/bin/hadoop: No s
matplotlib报错：AttributeError: module 'backend_interagg' has no attribute 'FigureCanvas'. Did you mean: 'FigureCanvasAgg'?
使用本地python环境可以成功执行 import pandas as pd import matplotlib.pyplot as plt # 设置字体 plt.rcParams[&#39;font.sans-serif&#39;] = [&#39;SimHei&#39;] # 能正确显示负号 p
gitlab登录失败，报错：This challenge page was accidentally cached by an intermediary and is no longer available.
设置时间 控制面板
后端开发常见错误
错误1：Request method ‘DELETE‘ not supported 错误还原：controller层有一个接口，访问该接口时报错：Request method ‘DELETE‘ not supported 错误原因：没有接收到前端传入的参数，修改为如下 参考 错误2：cannot r
docker常见错误
错误1：启动docker镜像时报错：Error response from daemon: driver failed programming external connectivity on endpoint quirky_allen 解决方法：重启docker -&gt; systemctl r
idea常见错误
错误1：private field ‘xxx‘ is never assigned 按Altʾnter快捷键，选择第2项 参考：https://blog.csdn.net/shi_hong_fei_hei/article/details/88814070 错误2：启动时报错，不能找到主启动类 #
pip安装依赖失败
报错如下，通过源不能下载，最后警告pip需升级版本 Requirement already satisfied: pip in c:\users\ychen\appdata\local\programs\python\python310\lib\site-packages (22.0.4) Coll
maven常见错误
错误1：maven打包报错 错误还原：使用maven打包项目时报错如下 [ERROR] Failed to execute goal org.apache.maven.plugins:maven-resources-plugin:3.2.0:resources (default-resources)
cloud项目中常见错误
错误1：服务调用时报错 服务消费者模块assess通过openFeign调用服务提供者模块hires 如下为服务提供者模块hires的控制层接口 @RestController @RequestMapping(&quot;/hires&quot;) public class FeignControl
springboot常见错误
错误1：运行项目后报如下错误 解决方案 报错2：Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile (default-compile) on project sb 解决方案：在pom.
springmvc拦截器中使用redisTemplate报空指针异常
参考 错误原因 过滤器或拦截器在生效时，redisTemplate还没有注入 解决方案：在注入容器时就生效 @Component //项目运行时就注入Spring容器 public class RedisBean { @Resource private RedisTemplate&lt;String
vite报错：npm ERR! command C:WINDOWSsystem32cmd.exe /d /s /c C:UsersychenAppDataLocalTempnpx-dde1c848.cmd
使用vite构建项目报错 C:\Users\ychen\work&gt;npm init @vitejs/app @vitejs/create-app is deprecated, use npm init vite instead C:\Users\ychen\AppData\Local\npm-
pythonJavaScriptjavaHTMLPHPreactjsC#AndroidCSSNode.jssqlrpython-3.xMysqLjQueryc++pandasFlutterangularIOSdjangolinuxswifttypescript路由器JSON路由器设置无线路由器h3c华三华三路由器设置华三路由器电脑软件教程arraysdocker软件图文教程Cvue.jslaravelspring-boot