简单的倒计时软件的开发过程及心得

package com.lala.jishi;

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

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends Activity implements OnClickListener{

private EditText inputet;private Button getTime,startTime,stopTime;private TextView time;private int i = 0;private Timer timer = null;private TimerTask task = null;@Overrideprotected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    initView();}private void initView(){    inputet = (EditText) findViewById(R.id.inputtime);    getTime = (Button) findViewById(R.id.gettime);    startTime = (Button) findViewById(R.id.starttime);    stopTime = (Button) findViewById(R.id.stoptime);    time = (TextView) findViewById(R.id.time);    getTime.setOnClickListener(this);    startTime.setOnClickListener(this);    stopTime.setOnClickListener(this);}@Overridepublic void onClick(View v) {    switch (v.getId()) {    case R.id.gettime:        time.setText(inputet.getText().toString());        i = Integer.parseInt(inputet.getText().toString());        break;    case R.id.starttime:        startTime();        break;    case R.id.stoptime:        stopTime();        break;    }}private Handler mHandler = new Handler(){    public void handleMessage(Message msg) {        time.setText(msg.arg1+"");        startTime();    };};public void startTime(){    timer = new Timer();    task = new TimerTask() {        @Override        public void run() {            i--;            Message  message = mHandler.obtainMessage();            message.arg1 = i;            mHandler.sendMessage(message);        }    };    timer.schedule(task, 1);}public void stopTime(){    timer.cancel();}

}