カウントダウンタイマーをつくる⑤ try1の解答

※アラーム音ファイルはフリーでネットから手に入ります。ダウンロードして、

raw ＞alarmdemo.mp3に入れてます。

MainActivity.java

package com.example.intervaltimerdemo4;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends AppCompatActivity {

    private int start_time;
    private int START_TIME;
    Button nextBtn;
    Button configBtn;
    EditText editMinute;

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

        editMinute = findViewById(R.id.editMinute);
        configBtn = findViewById(R.id.configBtn);
        nextBtn = findViewById(R.id.nextBtn);

        configBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                start_time = Integer.parseInt(editMinute.getText().toString());
                START_TIME = 60000*start_time;
            }
        });

        nextBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(MainActivity.this,FirstActivity.class);
                intent.putExtra("START_TIME",START_TIME);
                startActivity(intent);
            }
        });

    }
}

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"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:gravity="center_horizontal"
    tools:context=".MainActivity">
    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">

        <EditText
            android:id="@+id/editMinute"
            android:layout_width="100sp"
            android:layout_height="wrap_content"
            android:layout_marginTop="60sp"/>
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="60sp"
            android:text="分"/>
    </LinearLayout>

    <Button
        android:id="@+id/configBtn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="設定"/>

    <Button
        android:id="@+id/nextBtn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="次へ"/>

</LinearLayout>

FirstActivity.java

package com.example.intervaltimerdemo4;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Locale;

public class FirstActivity extends AppCompatActivity {
    private int START_TIME;
    TextView text_countdown;
    Button button_start;
    Button button_pause;
    Button button_reset;

    private boolean mTimerRunning;

    CountDownTimer mCountDownTimer;
    private long mTimeLeft;

    private MediaPlayer myMediaPlayer;

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

        Intent intent = getIntent();
        START_TIME = intent.getIntExtra("START_TIME",0);
        mTimeLeft = START_TIME;

        text_countdown = findViewById(R.id.text_view_countdown);
        SimpleDateFormat sdf = new SimpleDateFormat("mm:ss",Locale.US);
        text_countdown.setText(sdf.format(mTimeLeft));
        button_start = findViewById(R.id.button_start);
        button_pause = findViewById(R.id.button_pause);
        button_reset = findViewById(R.id.button_reset);

        button_start.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
              if(text_countdown.getText().toString().equals("00:00")){
                  Toast.makeText(FirstActivity.this,"押しても音は出ません",Toast.LENGTH_SHORT).show();
                }else{
                    if(mTimerRunning == true){
                        Toast.makeText(FirstActivity.this,"カウントダウン中は押せません",Toast.LENGTH_SHORT).show();
                    }else {
                        startTimer();
                    }
                }

            }
        });

        button_pause.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if(mTimerRunning ==true){
                    pauseTimer();
                }else{
                    Toast.makeText(FirstActivity.this,"カウントダウン停止中なので押せません",Toast.LENGTH_SHORT).show();
                }

            }
        });

        button_reset.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if(mTimerRunning == true){
                    Toast.makeText(FirstActivity.this,"カウントダウン中はリセットできません",Toast.LENGTH_SHORT).show();
                }else{
                    resetTimer();
                }

            }
        });
    }

    private void startTimer(){
        mCountDownTimer = new CountDownTimer(mTimeLeft,1000) {
            @Override
            public void onTick(long TimeUntilFinished) {
                mTimeLeft = TimeUntilFinished;
                updateCountDownText();
            }

            @Override
            public void onFinish() {
                mTimerRunning = false;
                Toast.makeText(FirstActivity.this,"10秒経過しました",Toast.LENGTH_LONG).show();

                myMediaPlayer = MediaPlayer.create(FirstActivity.this,R.raw.alarmdemo);
                try {
                    myMediaPlayer.prepare();
                } catch (Exception e) {
                    Log.v(null,e.toString());
                }
                myMediaPlayer.start();
            }
        }.start();

        mTimerRunning = true;
    }

    private void pauseTimer(){
        mCountDownTimer.cancel();
        mTimerRunning = false;
    }

    private void resetTimer(){
        mTimeLeft = START_TIME;
        mTimerRunning = false;
        updateCountDownText();
    }

    private void updateCountDownText(){
        int minutes = (int)(mTimeLeft/1000)/60;
        int seconds = (int)(mTimeLeft/1000)%60;
        String timerLeftFormatted = String.format(Locale.getDefault(), "%02d:%02d", minutes, seconds);
        text_countdown.setText(timerLeftFormatted);
    }
}

activity_first.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"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center_horizontal"
    android:orientation="vertical"
    tools:context=".FirstActivity">

    <TextView
        android:id="@+id/text_view_countdown"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="00:00"
        android:textSize="50sp"
        android:layout_marginTop="160sp"/>
    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">

        <Button
            android:id="@+id/button_start"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="スタート"
            android:layout_marginTop="30sp"
            android:layout_marginRight="20sp"/>

        <Button
            android:id="@+id/button_pause"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="ストップ"
            android:layout_marginTop="30sp"
            android:layout_marginRight="20sp"  />

        <Button
            android:id="@+id/button_reset"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="リセット"
            android:layout_marginTop="30sp"/>
    </LinearLayout>

</LinearLayout>