작업스레드 만들기

작업스레드

작업스레드에서 현재 시간을 표시하는 예

1. 레이아웃

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.progdv.currenttime.MainActivity">

    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/linearLayout">

        <Button
            android:id="@+id/btnStart"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="시작"
            />

        <Button
            android:id="@+id/btnStop"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="중지"
            />

    </LinearLayout>

    <TextView
        android:id="@+id/txtTime"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="현재 시간"
        android:layout_below="@+id/linearLayout"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_margin="25sp"/>
    
</RelativeLayout>

2. 메인 액티비티

package com.progdv.currenttime;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import java.util.Date;

public class MainActivity extends AppCompatActivity {

    boolean flag = true;
    TextView txtTime;


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

        Button btnStart = (Button)findViewById(R.id.btnStart);
        Button btnStop = (Button)findViewById(R.id.btnStop);
        TextView txtTime = (TextView)findViewById(R.id.txtTime);

        btnStart.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Thread thread = new Thread(new Runnable() {
                    @Override
                    public void run() {
                        while(flag) {
                            try {
                            Date date = new Date();
                            String currentTime = "현재 시간은: "+date.toString();
                            // txtTime.setText(currentTime); // 스레드 실행중 UI 변경시 정지된다.
                            Log.i("MyLog",currentTime);
                                Thread.sleep(1000);
                            } catch (InterruptedException e) {
                                e.printStackTrace();

                            }
                        }

                    }
                });

                thread.start();
            }
        });

        btnStop.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                flag = false;
            }
        }
}