Android Studio - 초 타이머 만들기

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📃초 타이머 만들기

📂소스코드

MainActivity.java

0.00MB

activity_main.xml

0.00MB

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📝activity_main.xml

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

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <Button
            android:id="@+id/btn_start"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="시작"
            android:textSize="30sp" />

        <Button
            android:id="@+id/btn_stop"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:text="일시정지"
            android:textSize="30sp" />

        <Button
            android:id="@+id/btn_reset"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="정지"
            android:textSize="30sp"
            android:layout_marginLeft="10dp"/>
    </LinearLayout>

    <TextView
        android:id="@+id/tv"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:textSize="50sp" />
</LinearLayout>

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📝MainActivity.java

package com.project.review01;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

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

public class MainActivity extends AppCompatActivity {
    TextView tv;
    int count = 0;

    Handler handler = new Handler(Looper.getMainLooper()) {
        @Override
        public void handleMessage(@NonNull Message msg) {
            super.handleMessage(msg);
            switch (msg.what) {
                case 1:
                    tv.setText(++count + "초");
                    sendEmptyMessageDelayed(1, 1000);
                    break;
                case 2:
                    removeMessages(1);
                    removeMessages(2);
                    break;
                case 3:
                    count = 0;
                    tv.setText("");
                    removeMessages(1);
                    removeMessages(2);
                    break;
            }
        }
    };

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

        tv = findViewById(R.id.tv);

        findViewById(R.id.btn_start).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                handler.sendEmptyMessage(1);
                v.setEnabled(false);
            }
        });

        findViewById(R.id.btn_stop).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                handler.sendEmptyMessage(2);
                findViewById(R.id.btn_start).setEnabled(true);
            }
        });

        findViewById(R.id.btn_reset).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                handler.sendEmptyMessage(3);
                findViewById(R.id.btn_start).setEnabled(true);
            }
        });
    }
}

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