为什么此 Web 服务代码不输出？

Question

I am a beginner Android developer, I wrote this code related to web service, but this program has no output (I am not getting any error). And I'm sure that the API is correct, but it doesn't show anything in the text view.And when the app is running on the device, the internet is on.

mainActiviy:

class MainActivity : AppCompatActivity() {
  lateinit var binding : ActivityMainBinding
  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    binding = DataBindingUtil.setContentView(this,R.layout.activity_main)
    binding.button.setOnClickListener(){
        get()

    }


}
fun get() {
    var cityname = binding.editTextTextPersonName.text.toString()
    val endpoint = "http://api.weatherapi.com/v1/current.json? ****** &q=ya&aqi=no"
    myAsyncTask().execute(endpoint)

}
    inner class myAsyncTask : AsyncTask<String, String, String>() {

        override fun doInBackground(vararg params: String?): String {
            try {

                val url = URL(params[0])
                val urlconnect=url.openConnection() as HttpURLConnection
                urlconnect.connectTimeout=100000
                val instring=convertsteamtoString(urlconnect.inputStream)
                publishProgress(instring)

            }catch (ex:Exception){}
            return ""
        }

        override fun onProgressUpdate(vararg values: String) {
            try {
               
                val json =JSONObject(values[0])
                var current=json.getJSONObject("current")
                var temp_c =current.getString("temp_c")
                 binding.textviewtemperature.text=temp_c

            }catch (ex:Exception){}

        }
        fun convertsteamtoString(inputStream :InputStream):String{


            val bufferReader =BufferedReader(InputStreamReader(inputStream))
            var line:String
            var allString :String =""
            try {
                do{
                    line = bufferReader.readLine()
                    allString += line

                }while (line != null)
            }catch (ex:Exception){}
            return allString

        }
    }

}

androidmanifest:

 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.example.webservice">
     <uses-permission android:name="android.permission.INTERNET"/>

<application
    android:allowBackup="true"
    android:dataExtractionRules="@xml/data_extraction_rules"
    android:fullBackupContent="@xml/backup_rules"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/Theme.WebService"
    tools:targetApi="31">
    <activity
        android:name=".MainActivity"
        android:exported="true">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>

Answer 1

When you write a catch block instead of ignoring the exception you get, you should log the exception so you dont miss events occuring in your code. Try something like this in your catch blocks:

Log.e("tag", exception)

And then checkout your Logcat for more info of whats happening to your app.