package com.example.myapplication;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

class MySum implements Runnable {
    private TextView tv;

    MySum(TextView tv){
        this.tv = tv;
    }
    @Override
    public void run() {
        // thread가 실행이 되면

        long sum = 0;
        for(long i=0; i<1000000000L; i++){
            sum += i;
        }
        tv.setText("총합은 : " + sum);
    }
}

public class AnrActivity extends AppCompatActivity {

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

        final TextView tv = (TextView)findViewById(R.id.countTv);
        Button countBtn = (Button)findViewById(R.id.countBtn);
        Button toastBtn = (Button)findViewById(R.id.toastBtn);

        countBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                // Thread를 파생시켜야 해요!!
                MySum mySum = new MySum(tv); // Runnable Interface를 구현한 객체

                Thread t = new Thread(mySum); // Thread를 생성

                t.start(); // non-blocking method, 새로운 실행흐름을 만들어 낼 수 있어요!

            }
        });

        toastBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(AnrActivity.this,"Toast가 실행되요!", Toast.LENGTH_SHORT).show();
            }
        });
    }
}