启动页倒计时

package com.example.shanping;

import java.lang.ref.WeakReference;

import com.example.shanping.MyActivity.MyCountDownTimer;

import android.os.Bundle;

import android.os.CountDownTimer;

import android.os.Handler;

import android.os.Message;

import android.app.Activity;

import android.content.Intent;

import android.util.Log;

import android.view.Menu;

import android.widget.TextView;

public class MainActivity extends Activity {

private MyCountDownTimer mc;

private TextView tv;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

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

mc = new MyCountDownTimer(3000, 1000);

mc.start();

handler.postDelayed(new Runnable() {

@Override

public void run() {

Intent intent=new Intent(MainActivity.this,MyActivity.class);

startActivity(intent);

}

}, 3000);

}

private Handler handler=new Handler();

/**

* 继承 CountDownTimer 防范

*

* 重写 父类的方法 onTick() 、 onFinish()

*/

class MyCountDownTimer extends CountDownTimer {

/**

*

* @param millisInFuture

* 表示以毫秒为单位 倒计时的总数

*

* 例如 millisInFuture=1000 表示1秒

*

* @param countDownInterval

* 表示 间隔 多少微秒 调用一次 onTick 方法

*

* 例如: countDownInterval =1000 ; 表示每1000毫秒调用一次onTick()

*

*/

public MyCountDownTimer(long millisInFuture, long countDownInterval) {

super(millisInFuture, countDownInterval);

}

public void onFinish() {

tv.setText("正在跳转");

}

public void onTick(long millisUntilFinished) {

tv.setText("倒计时(" + millisUntilFinished / 1000 + ")");

}

}

}