Thread & Handler

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"
    tools:context=".MainActivity3">

    <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>

 

main.java

public class MainActivity3 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_main3);

        btn_start = findViewById(R.id.btn_start);
        btn_stop = findViewById(R.id.btn_stop);

        //스레드 시작
        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.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                isThread = false;
            }
        });
    }
    private Handler handler = new Handler(){
        @Override
        public void handleMessage(@NonNull Message msg) {
            Toast.makeText(getApplicationContext(), "스레드",Toast.LENGTH_SHORT).show();
        }
    };
}

---

결과 값

• 5초 간격으로 스레드 내용이 표시되며, 스레드 종료 버튼을 누르면 더이상 내용이 표시되지 않는다