[Android] 안드로이드 스튜디오 쓰레드(thread) 사용 예시

xml파일

<?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"
android:orientation="vertical"
tools:context=".MainActivity">

<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
android:textSize="28dp"
android:textColor="#AA0000"
/>

<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
android:textColor="#AA0000"
android:textSize="28dp"
/>

</LinearLayout>

 

자바파일

package com.example.a25thread;

import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
	private Thread thread;
	private TextView textView;
	private TextView textView1;
	private int number = 0;
	private int num = 10000;

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

		textView = (TextView) findViewById(R.id.textView);
		textView1 = (TextView) findViewById(R.id.textView1);

		thread = new Thread() { // 쓰레드 생성
			public void run() {
				super.run();

				while (true) { // 무한반복
					try {
						sleep(1000);
					} catch (InterruptedException e) {
						e.printStackTrace();
					}

					number++;
					Log.i("test", "thread running..." + number++);

					runOnUiThread(new Runnable() {
						public void run() {
							textView.setText(String.valueOf(number));
						}
					});
				}

			}
		};

		thread.start();

		thread = new Thread() {
			public void run() {
				super.run();

				while (true) {
					try {
						sleep(1000);
					} catch (InterruptedException e) {
						e.printStackTrace();
					}

					num--;
					Log.i("test", "thread running..." + num--);

					runOnUiThread(new Runnable() {
						public void run() {
							textView1.setText(String.valueOf(num));
						}
					});
				}

			}
		};

		thread.start();
	}
}

 

 

출력 이미지

헬로 월드라는 문구가 출력되고

첫번째는 0부터 1000까지 2씩 증가하고

두번째는 1000부터 0까지 2씩 감소하게된다.