ExitBackChecker.java

package com.aincc.lib.ui.control;

import java.util.Timer;
import java.util.TimerTask;

import android.app.Activity;
import android.content.ContentResolver;
import android.database.ContentObserver;
import android.net.Uri;
import android.os.Handler;
import android.widget.Toast;

import com.aincc.lib.R;

/**
 * 
 * <h3><b>ExitBackChecker</b></h3></br>
 * 
 * @author aincc@barusoft.com
 * @version 1.0.0
 * @since 1.0.0
 */
public class ExitBackChecker
{
	private static final String EXIT_BACK_CHECKER = "EXIT_BACK_CHECKER";
	private Uri URI_BACK_TIMER = Uri.parse("aincc://com.aincc.lib.exit_back_checker");
	private Timer exitBackTimer = new Timer(EXIT_BACK_CHECKER);
	private TimerTask exitBackTimerTask = null;
	private ContentObserver observer;
	private ContentResolver resolver;
	private Activity context;
	private Handler handler;
	private int backDelay = 1000;

	/**
	 * 
	 * @since 1.0.0
	 * @param context
	 * @param handler
	 * @param delay
	 */
	public ExitBackChecker(Activity context, Handler handler, int delay)
	{
		this.context = context;
		this.handler = handler;
		this.backDelay = delay;
	}

	/**
	 * @since 1.0.0
	 */
	public void backPressed()
	{
		resolver.notifyChange(URI_BACK_TIMER, null);
	}

	/**
	 * 옵저버 등록
	 * 
	 * @since 1.0.0
	 */
	public void registerObserver()
	{
		resolver = context.getContentResolver();
		observer = new ContentObserver(handler)
		{
			@Override
			public void onChange(boolean selfChange)
			{
				if (null != exitBackTimerTask)
				{
					// 종료처리.
					exitBackTimerTask.cancel();
					context.finish();
					return;
				}
				exitBackTimer.purge();

				// 신규 타이머 태스크 생성
				TimerTask newTask = new TimerTask()
				{

					@Override
					public void run()
					{
						cancel();
						exitBackTimerTask = null;
					}

					@Override
					public boolean cancel()
					{
						return super.cancel();
					}

				};

				exitBackTimerTask = newTask;
				exitBackTimer.schedule(newTask, backDelay);
				handler.post(new Runnable()
				{

					@Override
					public void run()
					{
						Toast.makeText(context, context.getResources().getString(R.string.exit_by_backkey), Toast.LENGTH_SHORT).show();
					}
				});
			}
		};

		// 옵저버 등록
		resolver.registerContentObserver(URI_BACK_TIMER, true, observer);
	}

	/**
	 * 옵저버 해제
	 * 
	 * @since 1.0.0
	 */
	public void unregisterObserver()
	{
		if (null != resolver && null != observer)
		{
			resolver.unregisterContentObserver(observer);
		}
	}
}