Android-app-using-Kotlin - Unable to connect to the server error

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Unable to connect to the server error

Title

Question

My code is:

MainActvity.kt

-------------------

<pre style="background-color:#ffffff;color:#000000;font-family:'DejaVu Sans Mono';font-size:9.0pt;">package com.example.irttsearchapp

import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import android.widget.AdapterView
import android.widget.ArrayAdapter
import android.widget.Spinner
import android.widget.Toast
import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {

override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)

var fossVsFossID = HashMap<String, Int>()
fossVsFossID.put("Java",10)
fossVsFossID.put("Cpp",57)
fossVsFossID.put("Python",26)
fossVsFossID.put("RDBMS",92)

var languageVsLanguageID = HashMap<String,Int>()
languageVsLanguageID.put("English",22)
languageVsLanguageID.put("Hindi",6)
languageVsLanguageID.put("Gujarati",5)
languageVsLanguageID.put("Tamil",18)
languageVsLanguageID.put("Marathi",12)
languageVsLanguageID.put("Kannada",7)

var fossVsLanguage = HashMap<String, ArrayList<String>>()
var availablelanguagesforFoss: ArrayList<String>
availablelanguagesforFoss = arrayListOf("English","Gujarati","Hindi","Kannada")
fossVsLanguage.put("Java",availablelanguagesforFoss)
availablelanguagesforFoss = arrayListOf("English","Gujarati","Hindi","Kannada")
fossVsLanguage.put("Cpp",availablelanguagesforFoss)
availablelanguagesforFoss = arrayListOf("English","Gujarati","Hindi","Kannada")
fossVsLanguage.put("Python",availablelanguagesforFoss)
availablelanguagesforFoss = arrayListOf("English","Gujarati","Hindi","Kannada")
fossVsLanguage.put("RDBMS",availablelanguagesforFoss)

var fossSpinner = findViewById<Spinner>(R.id.Spinner1)
var languageSpinner = findViewById<Spinner>(R.id.Spinner2)
var fossOptions = fossVsFossID.keys.toList()
var languageOptions = languageVsLanguageID.keys.toMutableList()

var selectedFoss = "none"
 var selectedLanguage = "none"

 var fossAdapter = ArrayAdapter<String>(applicationContext,android.R.layout.simple_list_item_activated_1,fossOptions)
fossSpinner.adapter = fossAdapter

var languageAdapter = ArrayAdapter<String>(applicationContext,android.R.layout.simple_list_item_activated_1,languageOptions)
languageSpinner.adapter = languageAdapter

fossSpinner.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {

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

override fun onItemSelected(parent: AdapterView<*>?, view: View?, position: Int, id: Long) {

languageOptions.clear()

selectedFoss = fossOptions.get(position)

languageOptions.addAll(ArrayList(fossVsLanguage.get(selectedFoss)!!))
languageAdapter.notifyDataSetChanged()
}
}

languageSpinner.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {
override fun onNothingSelected(parent: AdapterView<*>?) {
}

override fun onItemSelected(parent: AdapterView<*>?, view: View?, position: Int, id: Long) {

selectedLanguage = languageOptions.get(position)
}
}

searchButton.setOnClickListener {
 if (selectedFoss == "none" || selectedLanguage == "none") {

Toast.makeText(this, "Please select FOSS and Language both", Toast.LENGTH_SHORT).show()

} else {

var fossID = fossVsFossID.get(selectedFoss)
var languageID = languageVsLanguageID.get(selectedLanguage)

var searchIntent = Intent(this, Main2Activity::class.java).apply {
 putExtra("fossID", "" + fossID)
putExtra("languageID", "" + languageID)
}

 startActivity(searchIntent)
}
}

 }

}

---------------------
Main2Activity.kt
----------------
package com.example.irttsearchapp

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Toast
import com.android.volley.Request
import com.android.volley.Response
import com.android.volley.toolbox.StringRequest
import com.android.volley.toolbox.Volley
import kotlinx.android.synthetic.main.activity_main2.*
import org.json.JSONArray
import org.json.JSONObject

class Main2Activity : AppCompatActivity() {

var finalResultsArrayList= ArrayList<VideoItem>()

override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main2)
var foss = intent.getStringExtra("fossID")
var language = intent.getStringExtra("languageID")
selectedOption.text = "Foss ID : " + foss + "\nLanguage ID : " + language
val queue = Volley.newRequestQueue(this)
val url = "https://spoke-tutorial.org/api/get_tutorials/"+foss+"/"+language
val stringRequest = StringRequest(Request.Method.GET,url, Response.Listener<String>
{response ->
 Toast.makeText(applicationContext,"Received server response!", Toast.LENGTH_SHORT).show()

extractJsonData(response)

}, Response.ErrorListener {
 Toast.makeText(applicationContext, "Unable to connect to the server", Toast.LENGTH_SHORT).show()
})
Toast.makeText(applicationContext,
"Contacting Server...", Toast.LENGTH_SHORT).show()
queue.add(stringRequest)

}
private fun extractJsonData(jsonResponse: String) {

var videosDataArray = JSONArray(jsonResponse)

var singleVideoJsonObject: JSONObject
var singleVideoItem: VideoItem
var i = 0
 var size = videosDataArray.length()

while (i < size)
{
singleVideoJsonObject = videosDataArray.getJSONObject(i)

singleVideoItem = VideoItem(singleVideoJsonObject.getString("video_id"),singleVideoJsonObject.getString("tutorial_name"),singleVideoJsonObject.getString("tutorial_level"))

finalResultsArrayList.add(singleVideoItem)

i++
}

println("The parsed videoItems are :")
finalResultsArrayList.forEach { println(it) }

 }
}
--------------------------
VideoItem.kt
------------
package com.example.irttsearchapp

data class VideoItem(val videoId : String,
val videoTitle: String,
val videoLevel: String)

</pre>

Android-app-using-Kotlin URL-Request 07-08 min 40-50 sec 18-06-21, 11:38 p.m. Rsenthil_1976

Answers:

Your website name in the code is wrong.(https://spoke-tutorial.org/ )

It is spoken-tutorial.org. Change the code and try.

21-06-21, 3:27 p.m. NirmalaVenkat

12-08-21, 12:36 a.m. aryanraje159@gmail.com

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