[Android/Java] 타이머

Demo

구성

• activity
• layout

 

MainActivity.java

package com.example.recyclerview;

import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.view.View;
import android.widget.Button;
import android.widget.SeekBar;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {
    private SeekBar seekBar;
    private TextView textView;
    private Button btnStart;
    private CountDownTimer countDownTimer;
    private Boolean counterIsActive = false;
    private MediaPlayer mediaPlayer;

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

        seekBar = findViewById(R.id.sb_timer);
        textView = findViewById(R.id.tv_timer);
        btnStart = findViewById(R.id.btn_start);
        mediaPlayer = MediaPlayer.create(getApplicationContext(), R.raw.media_sample_01);
        seekBar.setMax(300);
        seekBar.setProgress(30);
        seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
                update(progress);
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {

            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {

            }
        });
    }

    private void update(int progress) {
        int minutes = progress / 60;
        int seconds = progress % 60;
        String secondsFinal = "";
        if(seconds <= 9) {
            secondsFinal = "0" + seconds;
        } else {
            secondsFinal = "" + seconds;
        }
        seekBar.setProgress(progress);
        textView.setText("" + minutes + ":" + secondsFinal);
    }

    public void startTimer(View view) {
        if(counterIsActive == false) {
            counterIsActive = true;
            seekBar.setEnabled(false);
            btnStart.setText("STOP");
            countDownTimer = new CountDownTimer(seekBar.getProgress() * 1000, 10) {
                @Override
                public void onTick(long millisUntilFinished) {
                    update((int) millisUntilFinished / 1000);
                }

                @Override
                public void onFinish() {
                    reset();
                    if(mediaPlayer != null)
                        mediaPlayer.start();

                }
            }.start();
        } else {
            reset();
        }
    }

    private void reset() {
        textView.setText("0:30");
        seekBar.setProgress(30);
        countDownTimer.cancel();
        btnStart.setText("START");
        seekBar.setEnabled(true);
        counterIsActive = false;
    }

    @Override
    protected void onPause() {
        super.onPause();
        if(counterIsActive) {
            countDownTimer.cancel();
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if(counterIsActive) {
            countDownTimer.cancel();
        }
    }
}

 

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:gravity="center">

  <SeekBar
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:id="@+id/sb_timer"/>
  <TextView
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="0:30"
      android:id="@+id/tv_timer"
      android:textSize="60sp"/>
  <Button
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="start"
      android:id="@+id/btn_start"
      android:onClick="startTimer"/>
</LinearLayout>