Android 학습 기록 - Handler를 사용하여 스레드에서 데이터 전달

public class MainActivity extends Activity implements View.OnClickListener{
    private EditText editText;
    private Button button;
    private TextView textView;
    private ThreadTest threadTest;
    public Handler uihandler=new Handler(){
        @Override
        public void handleMessage(Message msg) {
                textView.setText((msg.getData().getIntegerArrayList("list")).toString());
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.thread);
        init();
        initlisten();
    }
    private void init(){
        editText=(EditText) findViewById(R.id.e_1);
        button=(Button) findViewById(R.id.b_1);
        textView=(TextView)findViewById(R.id.t_1);
        threadTest=new ThreadTest(uihandler);
        threadTest.start();
    }
    private void initlisten(){
        button.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        Message msg=new Message();
        msg.what=1;
        Bundle bundle=new Bundle();
        bundle.putInt("test",Integer.parseInt(editText.getText().toString()));
        msg.setData(bundle);
        threadTest.handler.sendMessage(msg);
    }
}

public class ThreadTest extends Thread {
    public android.os.Handler handler;
    public Handler uihandler;
    public ThreadTest(Handler mhandler){
        uihandler=mhandler;
    }

    public void run(){
        Looper.prepare();
        handler=new Handler() {
            @Override
            public void handleMessage(Message msg) {
                ArrayList nums=new ArrayList();
                if(msg.what==1){

                    int test=msg.getData().getInt("test");
                    outer:
                    for (int i=2;i<=test;i++){
                        for (int j=2;j<=Math.sqrt(i);j++){
                            if(i!=2&&i%j==0){
                                continue outer;
                            }
                        }
                        nums.add(i);
                    }
                }
                Message message=new Message();
                Bundle bundle=new Bundle();
                bundle.putIntegerArrayList("list",nums);
                message.setData(bundle);
                uihandler.sendMessage(message);
            }
        };
        Looper.loop();
    }
}