#15 안드로이드 스튜디오 Thread & Handler (스레드 & 핸들러) 예제 [ 홍드로이드 ]

<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="horizontal"
    tools:context=".MainActivity">
 
    <Button
        android:id="@+id/btn_start"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="스레드 시작"/>
 
    <Button
        android:id="@+id/btn_stop"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="스레드 종료"/>
 
</LinearLayout>

<MainActivity.java>

package com.example.threadexam;
 
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
 
public class MainActivity extends AppCompatActivity {
 
    Button btn_start, btn_stop;
    Thread thread;
    boolean isThread = false;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
 
        // 스레드 시작
        btn_start = (Button)findViewById(R.id.btn_start);
        btn_start.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
 
                isThread = true;
                thread = new Thread() {
                    public void run() {
                        while(isThread) {
                            try {
                                sleep(5000);
                            } catch (InterruptedException e) {
                                e.printStackTrace();
                            }
                            handler.sendEmptyMessage(0);
                        }
                    }
                };
                thread.start();
 
            }
        });
 
        // 스레드 종료
        btn_stop = (Button)findViewById(R.id.btn_stop);
        btn_stop.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                isThread = false;
            }
        });
 
    }
 
 
    private Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            Toast.makeText(getApplicationContext(), "홍드로이드 강의", Toast.LENGTH_SHORT).show();
        }
    };
}