Question

fileName =

DummyDataSource.kt

（这只是普通的kotlin类）

fun getBestSelling(): Observable<ArrayList<ProductEntity>> {

        val dummy1 = ProductEntity(name = "Bell Pepper Red", description = "1kg, Priceg",
            price = 20000,
            picture = R.drawable.iv_pepper_red,
            id = 5
        )
        val dummy2 = ProductEntity(name = "Beef bone", description = "1kg, Priceg",
            price = 25000,
            picture = R.drawable.iv_beef_bone,
            id = 6
        )
        val dummy3 = ProductEntity(name = "Boiler Chicken", description = "1kg, Priceg",
            price = 15000,
            picture = R.drawable.iv_boiler_chicken,
            id = 7
        )
        val dummy4 = ProductEntity(name = "Ginger", description = "250gm, Priceg",
            price = 22000,
            picture = R.drawable.iv_ginger,
            id = 4
        )

        val data = listOf(dummy1, dummy2, dummy3, dummy4)
        return Observable.just(ArrayList(data))
}

在这里我要做的是填充数组

fun getBestSelling(): Observable<ArrayList<ProductEntity>> {
var url:String="http:// 192.168.56.1/toko-online/mobile/pro_kategori.php"
        var rq : RequestQueue = Volley.newRequestQueue(this)
        var data = ArrayList<ProductEntity>()
        var js = JsonArrayRequest(Request.Method.GET,url,null, Response.Listener{ response ->
            for (x in 0..response.length()-1){
                data.add(ProductEntity(response.getJSONObject(x).getInt("id"),
                    response.getJSONObject(x).getInt("id"),response.getJSONObject(x).getString("name"),
                    response.getJSONObject(x).getString("url"),response.getJSONObject(x).getString("description"),
                    response.getJSONObject(x).getInt("price"),response.getJSONObject(x).getInt("stock"),
                    response.getJSONObject(x).getInt("category_id")))
            }
        }, Response.ErrorListener { error ->
            Toast.makeText(this,error.message,Toast.LENGTH_LONG).show()
        })
        rq.add(js)
        return Observable.just(data)
}

错误来自行var rq : RequestQueue = Volley.newRequestQueue(this)

错误是： type不匹配：推断类型是dummydatasource，但上下文！是预期的

我复制了此代码

fun getdata(): Observable<ArrayList<ProductEntity>> {
var url:String="http:// 192.168.56.1/toko-online/mobile/pro_kategori.php"
        var rq : RequestQueue = Volley.newRequestQueue(this)
        var data = ArrayList<ProductEntity>()
        var js = JsonArrayRequest(Request.Method.GET,url,null, Response.Listener{ response ->
            for (x in 0..response.length()-1){
                data.add(ProductEntity(response.getJSONObject(x).getInt("id"),
                    response.getJSONObject(x).getInt("id"),response.getJSONObject(x).getString("name"),
                    response.getJSONObject(x).getString("url"),response.getJSONObject(x).getString("description"),
                    response.getJSONObject(x).getInt("price"),response.getJSONObject(x).getInt("stock"),
                    response.getJSONObject(x).getInt("category_id")))
            }
        }, Response.ErrorListener { error ->
            Toast.makeText(this,error.message,Toast.LENGTH_LONG).show()
        })
        rq.add(js)
        return Observable.just(data)
}

主要活动中的Into

oncreate

。但是因此，我无法填充

getBestSelling()

中的数组，因为该函数

DummyDataSource.kt

仅返回数据到

getdata()

有任何方法可以使数据转到

oncreate

？
    

将您的函数从otCreate中恢复并用上下文参考替换为“ this”（requrecontext（）或在oncreate中创建上下文var以参考）