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I created a resultreceiver class,passed it using intent to the service and implemented the send() in the service to pass the Bundle to the Activity.

I guess I have followed the right steps, I have also implemented the runonUithread() method in the onresultReceive() method.


The goal is simple , as the user clicks on the button, the service gets started and then the Hardcoded String data is to be passed to the Activity to update a textview.

PROBLEM : when I click on the button, Nothing happens. There is no output in the logcat as well as not change in the textview. I guess I have missed something in the code, but I have no idea what it is.

passing my whole code here :

-----------------------------------------------------------
activity_main.xml :
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/textview1"
        android:layout_width="0dp"
        android:layout_height="1dp"
        app:layout_constraintBottom_toTopOf="@+id/button"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent" />

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="216dp"
        android:onClick="StartService"
        android:text="Click"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.498"
        app:layout_constraintStart_toStartOf="parent" />


</androidx.constraintlayout.widget.ConstraintLayout>
----------------------------------------------

MainActivity.java :
package com.deepesh.startedserviceapp;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.ResultReceiver;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    public static final String MESSAGE_KEY="message_key";
    public static final String RECEIVER_TAG = "RECEIVER_TAG";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    public void setTextviewtext(String s ){
        TextView textView = findViewById(R.id.textview1);
        textView.setText(s);
    }


    public void StartService(View view) {

        ResultReceiver receiver = new MyResultReceiver(null);
        Intent intent = new Intent(MainActivity.this,started_service.class);
        intent.putExtra(MainActivity.RECEIVER_TAG,receiver);

        startService(intent);
    }


    class MyResultReceiver extends ResultReceiver{

        public MyResultReceiver(Handler handler) {
            super(handler);
        }


        @Override
        protected void onReceiveResult(int resultCode, Bundle resultData) {
            super.onReceiveResult(resultCode,resultData);

           if (resultData !=null){

              final String data = resultData.getString(MainActivity.MESSAGE_KEY);

               MainActivity.this.runOnUiThread(new Runnable() {
                   @Override
                   public void run() {
                       setTextviewtext(data);
                   }
               });

           }
        }

    }


}
---------------------------------------------------------

started_service.java :
package com.deepesh.startedserviceapp;

import android.app.Service;
import android.content.Intent;
import android.os.Bundle;
import android.os.IBinder;
import android.os.ResultReceiver;


public class started_service extends Service {

    public started_service() {
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {

        ResultReceiver receiver = intent.getParcelableExtra(MainActivity.RECEIVER_TAG);

        Bundle bundle = new Bundle();
        bundle.putString(MainActivity.MESSAGE_KEY,"Hello World !");

        receiver.send(MainActivity.RESULT_OK,bundle);

        return Service.START_REDELIVER_INTENT;
    }

    @Override
    public IBinder onBind(Intent intent) {

        return null;
    }

}


What I have tried:

I tried to google but there is no recent updated answer for this problem.
Posted
Updated 15-Jul-20 23:52pm
v3
Comments
Garth J Lancaster 16-Jul-20 2:44am
   
Well, you've stated the intent, shown some code, but you haven't actually described 'what happens' - do you get an error, exception, or does the code not even compile ? .. it may be a good idea to use Improve question and say what the actual issue is.
[no name] 16-Jul-20 4:52am
   
Done. added it
David Crow 16-Jul-20 22:38pm
   
"There is no output in the logcat..."

Maybe because there are no calls to any of the Log methods.

Are you missing try/catch blocks on purpose?

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