如何基于onItemSelectedListener在textview中显示纺织品？

Question

我正在尝试使用onItemSelectedListener将res / raw中的文本文件显示到textview中。

我可以进行这种硬编码，但是效率不高，因为我有10多个文本文件。因此，我尝试优化代码并显示基于索引的文本文件，该索引从JSON文件读取。但是，当我尝试此操作时，textview中没有任何显示，也没有引发任何错误。它只是说找不到该文件。

spSongs.onItemSelectedListener =
                        object : AdapterView.OnItemSelectedListener {
                            override fun onItemSelected(
                                adapterView: AdapterView<*>,
                                view: View,
                                i: Int,
                                l: Long
                            ) {

                                songIndex = i  //remember what the user chooses

                                try {
                                    var x = myJSON_array.getJSONObject(songIndex)
                                        .getString("filename")
                                    x = x.substring(0, x.lastIndexOf("."))
                                    val temp = resources.getIdentifier(
                                        x,
                                        "raw",
                                        packageName
                                    )
                                    val input_stream =
                                        baseContext.resources.openRawResource(temp)
                                    val text = input_stream.readBytes()
                                        .toString(Charset.defaultCharset())
                                    tvlyrics.text = text

                                } catch (e: JSONException) {
                                    e.printStackTrace()
                                }
                                //end of try-catch for painting JSON decode
                            }//end of onItemSelected of Painting spinner

                            override fun onNothingSelected(adapterView: AdapterView<*>) {}
                        }// end of setOnItemSelectedListener

谢谢