Android 倒计时类

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前言:
在考试APP和网络培训上有很多的应用,自己写的CounterTimer类.

测试用小例子:

package com.elvis.cnttimer;import android.os.Bundle;import android.os.CountDownTimer;import android.app.Activity;import android.graphics.Color;import android.view.Menu;import android.view.Window;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends Activity {    private TextView txtView;    private MyCnt mCnt;    @Override    protected void onCreate(Bundle savedInstanceState) {        requestWindowFeature(Window.FEATURE_NO_TITLE);        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        txtView = (TextView)findViewById(R.id.textView1);        mCnt = new MyCnt(2*1000*3600,1000);        mCnt.start();    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, menu);        return true;    }    public class MyCnt extends CountDownTimer{        public MyCnt(long millisInFuture, long countDownInterval) {            super(millisInFuture, countDownInterval);            // TODO Auto-generated constructor stub        }        @Override        public void onFinish() {            // TODO Auto-generated method stub            Toast.makeText(MainActivity.this, "时间到了...", Toast.LENGTH_SHORT);        }        @Override        public void onTick(long m) {            // TODO Auto-generated method stub             // m 是微秒为单位的             //小时 设置             int myHour = (int)((m/1000)/3600);             String myHourStr = myHour + "";             if(myHourStr.length() < 2)              {                 myHourStr = "0" + myHourStr;             }             //分钟设置             int myMin = (int)(((m/1000)- myHour *3600)/60);             String myMinStr = myMin + "";             if(myMinStr.length() < 2)              {                 myMinStr = "0" + myMinStr;             }             //秒设置             int mySec= (int)((m/1000)- myHour *3600 - myMin * 60);             String mySecStr = mySec + "";             if(mySecStr.length() < 2)              {                 mySecStr = "0" + mySecStr;             }             txtView.setTextSize(22);             txtView.setTextColor(Color.RED);             txtView.setText("倒计时 \n\n" + myHourStr + "/" + myMinStr + "/" + mySecStr);        }    }}

注意:
super.onCreate(savedInstanceState);
去掉这句话程序不能运行.因为父类的onCreate()完成了很多我们不能接触的事情来确保我们的app能顺利运行.

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