Android Thread with Handler example

Android 에서 개발자 정의 백그라운드 Thread와 Handler 클래스를 사용하는 예

시작버튼을 누르면 ImageView에 이미지를 1초에 한번씩 변경하여 보여주고 정지버튼을 눌러 쓰레드를 중지하는 예

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
		android:layout_width="fill_parent"
		android:layout_height="fill_parent"
		android:background="#FF4444CC"	
		android:orientation="vertical">

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

        <Button
            android:id="@+id/button1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="onBtnClick"
            android:text="Thread Start" />

        <Button
            android:id="@+id/button2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="onBtnStop"
            android:text="Thread Stop" />

    </LinearLayout>

    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/ic_launcher" />

</LinearLayout>

ThreadDemo.java

package my.android.test;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.widget.EditText;

public class ThreadDemo extends Activity {

	ImageView imageView1;
	int imgID;
	boolean isRunning;
	
	Handler handler = new Handler() {

		@Override
		public void handleMessage(Message msg) {
			super.handleMessage(msg);
			if(imgID==R.drawable.ic_launcher) imgID=R.drawable.mountain;
			else imgID = R.drawable.ic_launcher;
			imageView1.setImageResource(imgID);
		}
	};
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		imageView1 = (ImageView) this.findViewById(R.id.imageView1);
	}

	@Override
	public void onBtnClick(View v) {
	  super.onStart();
	  isRunning = true;
	  new Thread(new Runnable() {
		@Override
		public void run() {
		  for(int i=0;i<10 && isRunning;i++) {
		    try {
			Thread.sleep(1000);
			handler.sendMessage(handler.obtainMessage());
		    } catch (InterruptedException e) {
			e.printStackTrace();
		    }
		  }
		}
			
	  }).start();
	}

	public void onBtnStop(View v) {
	  isRunning = false;
	}

	@Override
	protected void onStop() {
		super.onStop();
		isRunning = false;
	}

}