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µÚ·Î°¡±â(Back ¹öư) µÎ¹ø ´­·¯ ¾Û Á¾·áÇϱâ
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¿äÁò ¸¹Àº ¾îÇõéÀÌ µÚ·Î°¡±â ¹öưÀ» µÎ¹ø ´­·¯ ¾ÛÀ» Á¾·á½ÃŲ´Ù.
Á¾·áÇϽðڽÀ´Ï±î? ¶ó´Â È®ÀÎâÀÌ ¶ß°í È®ÀÎÀ» ´­·¯¾ß µÇ´Â ¹ø°Å·Î¿òÀÌ ¾ø°í, À߸ø Á¾·á¹öưÀ» ´­·¶À» °æ¿ì¿¡µµ Å佺Ʈ ¾Ë¸²Ã¢¸¸ ¶ã»Ó º°´Ù¸¥ ¹æÇØ¿ä¼Ò°¡ ¾ø¾î¼­ Âü ÁÁÀº°Í °°´Ù.

¿äÁò ´ëºÎºÐÀÇ ¾ÛÀÌ ÀÌ·¯ÇÑ Á¾·á ¹æ½ÄÀ» ¼±ÅÃÇϰí Àֱ⶧¹®¿¡ Çѹø ±¸ÇöÀ» ÇØº¸ÀÚ. ±¸Çö¹æ¹ýÀº °£´ÜÇÏ´Ù µÚ·Î°¡±â ¹öư Ŭ¸¯½Ã ÇöÀç½Ã°£À» ÀúÀåÇϸç Å佺Ʈ ¾Ë¸²Ã¢À» ¶ç¿öÁÖ°í Çѹø´õ ´­·¶À»¶§ ÀÏÁ¤½Ã°£(¿¹¸¦µé¸é 2ÃÊ)°¡ Áö³µ´ÂÁö È®ÀÎÇϰí ÀÏÁ¤½Ã°£ÀÌ Áö³ªÁö ¾Ê¾ÒÀ» °æ¿ì Á¾·á, Áö³µÀ» °æ¿ì ¾Ë¸²Ã¢À» ´Ù½Ã ¶ç¿öÁÖ¸é µÈ´Ù.

1. ½Ã°£À» ÀúÀåÇÏ´Â º¯¼ö(t) = 0;

2. µÚ·Î°¡±â ¹öư (óÀ½)Ŭ¸¯½Ã ½Ã°£À» ÀúÀåÇÏ´Â º¯¼ö(t) + 2000(2ÃÊ)°¡ ÇöÀç ½Ã°£º¸´Ù ÀÛ´Ù.

3-1. ¾Ë¸²Ã¢À» ¶ç¿î´Ù.('µÚ·Î'¹öưÀ» Çѹø ´õ ´©¸£½Ã¸é Á¾·áµË´Ï´Ù.)


3-2. ½Ã°£À» ÀúÀåÇÏ´Â º¯¼ö(t)¿¡ ÇöÀç ½Ã°£À» ÀúÀåÇÑ´Ù.

4. µÚ·Î°¡±â ¹öưÀ» Çѹø´õ Ŭ¸¯

5-1. ÇöÀç ½Ã°£ÀÌ º¯¼öt + 2000º¸´Ù ÀÛÀ¸¸é ¾Û Á¾·á

5-2. ÇöÀç ½Ã°£ÀÌ º¯¼öt + 2000º¸´Ù Å©¸é t¿¡ ÇöÀç½Ã°£À» ÀúÀåÇÏ°í ¾Ë¸²Ã¢À» ¶ç¿î´Ù.

±Û·Î º¸¸é ¾î·Æ´õ¶óµµ ¼Ò½º¸¦ º¸¸é ¾Æ¸¶ ¹Ù·Î ÀÌÇØ°¡ °¥ °ÍÀÌ´Ù. ¸ÕÀú µÚ·Î°¡±â ¹öưÀÇ À̺¥Æ®¸¦ ´ã´çÇϴ Ŭ·¡½º¸¦ Çϳª ¸¸µé¾ú´Ù.

BackPressCloseHandler.java
import android.app.Activity;
import android.widget.Toast;

public class BackPressCloseHandler {

    private long backKeyPressedTime = 0;
    private Toast toast;

    private Activity activity;

    public BackPressCloseHandler(Activity context) {
        this.activity = context;
    }

    public void onBackPressed() {
        if (System.currentTimeMillis() > backKeyPressedTime + 2000) {
            backKeyPressedTime = System.currentTimeMillis();
            showGuide();
            return;
        }
        if (System.currentTimeMillis() <= backKeyPressedTime + 2000) {
            activity.finish();
            toast.cancel();
        }
    }

    public void showGuide() {
        toast = Toast.makeText(activity,
                "\'µÚ·Î\'¹öưÀ» Çѹø ´õ ´©¸£½Ã¸é Á¾·áµË´Ï´Ù.", Toast.LENGTH_SHORT);
        toast.show();
    }
}
´ÙÀ½Àº ÀÌ ±â´ÉÀ» »ç¿ëÇÏ·Á´Â ¾×ƼºñƼ¿¡¼­ ³Ö¾îÁà¾ß µÇ´Â ¼Ò½ºÀÌ´Ù.

»ç¿ëÇÏ·Á´Â ¾×ƼºñƼ¿¡ onBackPressed()¸Þ¼Òµå¸¦ »ý¼ºÇϰí BackPressCloseHandler Ŭ·¡½ºÀÇ onBackPressed()¸Þ¼Òµå¸¦ ºÒ·¯¿ÍÁÖ¸é µÈ´Ù.


MainActivity.java
public class MainActivity extends Activity {

    private BackPressCloseHandler backPressCloseHandler;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        backPressCloseHandler = new BackPressCloseHandler(this);
    }

    @Override
    public void onBackPressed() {
        //super.onBackPressed();
        backPressCloseHandler.onBackPressed();
    }
}
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