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lateinit var playerStats: PlayerStats
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
Picasso.get().load("https://...../....../example.png").into(Viewer)
var PlayerName: String = ""
fun fetchJson() {
val url = "https://my.api.site/example/"
val request = Request.Builder().url(url).build()
val client = OkHttpClient()
client.newCall(request).enqueue(object : Callback {
var mainHandler = Handler(this@MainActivity.getMainLooper())
override fun onResponse(call: Call, response: Response) {
mainHandler.post {
val body = response.body()?.string()
if (body == null) return@post
println(body)
val gson = GsonBuilder().create()
playerStats = gson.fromJson(body, PlayerStats::class.java)
println(playerStats)
// TODO Now you can access to your view and set every thing to textView
textView.text = playerStats.username
override fun onFailure(call: Call, e: IOException) {
println("API execute failed")
buttonGO.setOnClickListener {
PlayerName = editText.text.toString()
fetchJson()
if (PlayerName == null || PlayerName.trim() == "") {
println("please input data, input cannot be blank")
} else {
Picasso.get().load("https://...../...../" + PlayerName + ".png")
.into(Viewer)
textView.setText(PlayerName).toString()
} ```
I have this code for my api request and it works when I use
debugger
.
I can see the results in the PlayerStats class but now I have a problem.
But on the
MainActivity.class
this
function
don't work:
val url = "https://api.example.com/..../"
val request = Request.Builder().url(url).build()
val client = OkHttpClient()
client.newCall(request).enqueue(object: Callback {
override fun onResponse(call: Call, response: Response) {
val body = response?.body?.string()
println(body)
val gson = GsonBuilder().create()
val PlayerStats = gson.fromJson(body, PlayerStats::class.java)
println(PlayerStats)
override fun onFailure(call: Call, e: IOException) {
println("API execute failed")
Stats.class:
class PlayerStats(val username: String , val level: Double )
I need a way to get access to the val username / val level from MainActivity
class MainActivity(val mystats: PlayerStats) : AppCompatActivity(){
Not works, because of the zero arguments.
If I try to fix:
class MyActivity: AppCompatActivity() {
var myStats: Stats? = null
The IDE say it needs a safe call or a non-null asserted call but if I try this with the non-null asserted call the application crash and i get this error:
2020-03-05 18:58:02.803 23276-23276/my.example.package
E/AndroidRuntime:
FATAL EXCEPTION: main
Process: my.example.package, PID: 23276
kotlin.KotlinNullPointerException
at my.example.package.MainActivity$onCreate$1.invoke(MainActivity.kt:31)
at my.example.package.MainActivity$onCreate$3.onClick(MainActivity.kt:68)
at android.view.View.performClick(View.java:7125)
at android.view.View.performClickInternal(View.java:7102)
at android.view.View.access$3500(View.java:801)
at android.view.View$PerformClick.run(View.java:27336)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
With the safe call I get null as output
Full code:
MainActivity.class:
package my.example.package
import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import com.google.gson.GsonBuilder
import com.squareup.picasso.Picasso
import kotlinx.android.synthetic.main.activity_main.*
import okhttp3.OkHttpClient
import okhttp3.Request
import okhttp3.*
import java.io.IOException
class MainActivity : AppCompatActivity(){
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
Picasso.get().load("https://...../....../example.png").into(Viewer)
var PlayerName: String = ""
fun fetchJson() {
val url = "https://my.api.site/example/"
val request = Request.Builder().url(url).build()
val client = OkHttpClient()
client.newCall(request).enqueue(object: Callback {
override fun onResponse(call: Call, response: Response) {
val body = response?.body?.string()
println(body)
val gson = GsonBuilder().create()
val PlayerStats = gson.fromJson(body, PlayerStats::class.java)
println(PlayerStats)
override fun onFailure(call: Call, e: IOException) {
println("API execute failed")
buttonGO.setOnClickListener {
PlayerName = editText.text.toString()
fetchJson()
if (PlayerName == null || PlayerName.trim() == "") {
println("please input data, input cannot be blank")
} else {
Picasso.get().load("https://...../...../" + PlayerName + ".png")
.into(Viewer)
textView.setText(PlayerName).toString()
PlayerStats.class:
package my.example.package
class PlayerStats(val username: String , val level: Double )
lateinit var playerStats: PlayerStats
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
Picasso.get().load("https://...../....../example.png").into(Viewer)
var PlayerName: String = ""
fun fetchJson() {
val url = "https://my.api.site/example/"
val request = Request.Builder().url(url).build()
val client = OkHttpClient()
client.newCall(request).enqueue(object : Callback {
var mainHandler = Handler(this@MainActivity.getMainLooper())
override fun onResponse(call: Call, response: Response) {
mainHandler.post {
val body = response.body()?.string()
if (body == null) return@post
println(body)
val gson = GsonBuilder().create()
playerStats = gson.fromJson(body, PlayerStats::class.java)
println(playerStats)
// TODO Now you can access to your view and set every thing to textView
textView.text = playerStats.username
override fun onFailure(call: Call, e: IOException) {
println("API execute failed")
buttonGO.setOnClickListener {
PlayerName = editText.text.toString()
fetchJson()
if (PlayerName == null || PlayerName.trim() == "") {
println("please input data, input cannot be blank")
} else {
Picasso.get().load("https://...../...../" + PlayerName + ".png")
.into(Viewer)
textView.setText(PlayerName).toString()
} ```
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