学步园

package com.test.countdowntimer;

import android.app.Activity;

import android.os.Bundle;

import android.os.CountDownTimer;

import android.util.Log;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.TextView;

import com.test.R;

public
class CountDownTimeActivity
extends Activity
implements   OnClickListener {

    TextView
mTextView;

    Button
mButton1;

    Button
mButton2;

   
@Override

   
protected
void   onCreate(Bundle savedInstanceState) {

      
super.onCreate(savedInstanceState);

       setContentView(R.layout.countdown);

      
mTextView =   (TextView)findViewById(R.id.textView1);

      
mButton1 =   (Button)findViewById(R.id.button1);

      
mButton2 =   (Button)findViewById(R.id.button2);

      
mButton1.setOnClickListener(this);

      
mButton2.setOnClickListener(this);

    }

    CountDownTimer
timer =
new   CountDownTimer(40000,1000) {

      
@Override

      
public
void onTick(long   millisUntilFinished) {

          
mTextView.setText("seconds remaining: "
+ millisUntilFinished / 1000);

          
try {

              Thread.sleep(1200);

           }
catch   (InterruptedException e) {

              e.printStackTrace();

           }

           Log.e("CountDown",millisUntilFinished+"");

       }

      
@Override

      
public
void onFinish() {

          
mTextView.setText("done！");

       }

    };

   
@Override

   
public
void onClick(View   v) {

      
switch(v.getId()){

      
case R.id.button1:

          
timer.start();

          
break;

      
case R.id.button2:

          
timer.cancel();

          
break;

       }

    }

}

<?xml
version="1.0"encoding="utf-8"?>

<LinearLayout

xmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical"

android:layout_width="match_parent"

android:layout_height="match_parent">

   
<TextView
android:text="TextView"android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"></TextView>

   
<Button
android:text="开始"
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"></Button>

   
<Button
android:text="取消"
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"></Button>

</LinearLayout>