package com.bwei.timer;

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

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.app.Activity;
import android.view.Menu;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {
	int time=3;

	 //建立Timer計時器
	Timer timer = new Timer();
	private TextView tv_time;
	
	private Handler handler = new Handler(){
		public void handleMessage(android.os.Message msg) {
			if(msg.what==0){
				if(time==-1){
					Toast.makeText(MainActivity.this, "倒計時結束", 0).show();
					
					return;
				}
				tv_time.setText("倒計時："+(time--)+"秒");
			}
			
		};
	};
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		tv_time = (TextView) findViewById(R.id.tv_time);
		//執行計時任務
		timer.schedule(new MyTimerTask(), 1000, 1000);
		
		
	}
//定義TimerTask
	private class MyTimerTask extends TimerTask{
			
			Message message = handler.obtainMessage(0);
			message.sendToTarget();
			
		}
		
	}

}