정윤문경아빠의 이야기

MainActivity.java 

public class MainActivity extends Activity{

    protected void onCreate(Bundle savedInstanceState){

        super.onCreate(savedInstanceState);

        SharedPreferences pref = getSharedPreferences("pref", MODE_PRIVATE);

        pref.getString("check", "");

        if(pref.getString("check", "").isEmpty()){

Intent shortcutIntent = new Intent(Intent.ACTION_MAIN);

shortcutIntent.addCategory(Intent.CATEGORY_LAUNCHER);

shortcutIntent.setClassName(this, getClass().getName());

shortcutIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK| 

Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);

Intent intent = new Intent();

intent.putExtra(Intent.EXTRA_SHORTCUT_INTENT, shortcutIntent);

intent.putExtra(Intent.EXTRA_SHORTCUT_NAME, getResources().getString(R.string.app_name));

intent.putExtra(Intent.EXTRA_SHORTCUT_ICON_RESOURCE,

Intent.ShortcutIconResource.fromContext(this, R.drawable.ic_launcher));

intent.putExtra("duplicate", false);

intent.setAction("com.android.launcher.action.INSTALL_SHORTCUT");

sendBroadcast(intent);

        }

SharedPreferences.Editor editor = pref.edit();

        editor.putString("check", "exist");

        editor.commit();

    }

}

AndroidManifest.xml 

<uses-permission android:name="com.android.launcher.permission.INSTALL_SHORTCUT" />  // 추가해줍니다.

BackPressCloseHandler.java

public class BackPressCloseHandler extends Activity {

private long backKeyPressedTime = 0;

private Toast toast;

private Activity activity;

public BackPressCloseHandler(MainActivity 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();

         }

        }

        private void showGuide() {

         toast = Toast.makeText(activity, "뒤로 버튼을 한번 더 터치하시면 종료됩니다.",

         Toast.LENGTH_SHORT);

         toast.show();

        }

}

MainActivity.java 

private BackPressCloseHandler backPressCloseHandler;

@Override

protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    backPressCloseHandler = new BackPressCloseHandler(this);

}

public void onBackPressed() {

    backPressCloseHandler.onBackPressed();

}