android 注册、获取验证码倒计时类

package com.example.timecount;

import android.os.Bundle;

import android.os.CountDownTimer;

import android.app.Activity;

import android.content.DialogInterface;

import android.content.DialogInterface.OnClickListener;

import android.util.Log;

import android.view.Menu;

import android.view.View;

import android.widget.Button;

import android.widget.TextView;

public class MainActivity extends Activity implements android.view.View.OnClickListener {

TextView mTextView;

Button mButton1;

Button mButton2;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

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);

}

@Override

public void onFinish() {

mTextView.setText("Finished");

}

};

@Override

public void onClick(View v) {

switch (v.getId()) {

case R.id.button1:

timer.start();

break;

case R.id.button2:

timer.cancel();

break;

}

}

}