Simple timer app using asncTask class

#1

mainActivity:

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package com.example.stopwatch;
import androidx.appcompat.app.AppCompatActivity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
public static final String TAG = “ASYNC”;
Button btnStart, btnPause;
EditText etMin, etSec;
TextView tvTime;
int minutes=0;
int seconds=0;
Stopwatch sw;

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

    btnPause = findViewById(R.id.btnPause);
    btnStart = findViewById(R.id.btnStart);
    etMin = findViewById(R.id.etMin);
    etSec = findViewById(R.id.etSec);
    tvTime = findViewById(R.id.tvTime);

    btnStart.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Log.d(TAG, "btnStart: Started");
            if (etMin.getText().toString() != "") {
                minutes = Integer.parseInt(etMin.getText().toString());
            }
            if (etSec.getText().toString() != "") {
                seconds = Integer.parseInt(etSec.getText().toString());
            }
            etMin.setText(null);
            etSec.setText(null);
            sw = new Stopwatch();
       //     Log.d(TAG, "Min: " + minutes + " sec: " + seconds);
            sw.execute();
            Log.d(TAG, "btnStart: Ended");
        }
    });

    btnPause.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            sw.cancel(true);
            String time=minutes+" : " +seconds;
            tvTime.setText(time);
        }
    });
}

class Stopwatch extends AsyncTask<Integer, Integer, Void> {
    @Override
    protected Void doInBackground(Integer... integers) {
        Log.d(TAG, "Do in Background: Started");
       int min=minutes;
       int sec=seconds;
        for (int i = min; i >= 0; i--) {
            if (i == min) {
                for (int j = sec; j >= 0; j--) {
                    --seconds;
                    wait1sec();
                    publishProgress(i, j);
                }
            } else {
                for (int j = 59; j >= 0; j--) {
                    --seconds;
                    wait1sec();
                    publishProgress(i, j);
                }
            }
            --minutes;
        }
        Log.d(TAG, "Do in Background: Ended");
        return null;
    }


    @Override
    protected void onProgressUpdate(Integer... values) {

        super.onProgressUpdate(values);
        String time = values[0] + " : " + values[1];
        if (values[0] == 0 && values[1] == 0) {
            tvTime.setText("TIME UP !!!!");
        } else
            tvTime.setText(time);
    }
}

void wait1sec() {
    long startTime = System.currentTimeMillis();
    while (System.currentTimeMillis() < startTime + 1000) ;
}

}