package com.example.counterapp;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    TextView lblCounter;
    Button btnStart,btnStop;
    int counter=0;
    boolean running=false;

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

        lblCounter =(TextView)  findViewById(R.id.c_val);
        btnStart=(Button) findViewById(R.id.start_but);
        btnStop=(Button) findViewById(R.id.stop_but);

        btnStart.setOnClickListener(this);
        btnStop.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        if(v.equals(btnStart))
        {
            counter=0;
            running=true;
            new MyCounter().start();
        }
        else if(v.equals(btnStop))
        {
            running=false;
        }
    }
    Handler handler=new Handler(){
        @Override
        public void handleMessage( Message m) {
            lblCounter.setText(String.valueOf(m.what));
        }
    };


    private class MyCounter extends Thread {
        public void run()
        {
            while(running)
            {
                counter++;
                handler.sendEmptyMessage(counter);
                try{
                    Thread.sleep(1000);
                }catch(Exception e){

                }
            }
        }
    }
}