activity_main.xml中的代碼

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

android:layout_width="match_parent"

android:layout_height="match_parent"

android:background="@android:color/white"

>

android:id="@+id/mytime"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:gravity="center"

android:textColor="@android:color/black"

android:textSize="36sp"/>

MainActivity.java主文件中的代碼

package com.example.time;

import java.text.SimpleDateFormat;

import java.util.Date;

import java.util.Locale;

import android.app.Activity;

import android.os.Bundle;

import android.os.Handler;

import android.os.Message;

import android.text.format.DateFormat;

import android.widget.TextView;

public class MainActivity extends Activity {

private static final int msgKey1 = 1;

private TextView mTime;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

mTime = (TextView) findViewById(R.id.mytime);

new TimeThread().start();

}

public class TimeThread extends Thread {

@Override

public void run () {

do {

try {

Thread.sleep(1000);

Message msg = new Message();

msg.what = msgKey1;

mHandler.sendMessage(msg);

}

catch (InterruptedException e) {

e.printStackTrace();

}

} while(true);

}

}

private Handler mHandler = new Handler() {

@Override

public void handleMessage (Message msg) {

super.handleMessage(msg);

switch (msg.what) {

case msgKey1:

//獲取分鐘數

long sysTime = System.currentTimeMillis();

String mmtime = (String) DateFormat.format("mm", sysTime);

int i = Integer.parseInt(mmtime);

//倒計時

SimpleDateFormat sdfStopTime = new SimpleDateFormat("mm:ss", Locale.ENGLISH);

if(i < 30){

String newStoptime = sdfStopTime.format(new Date(30 * 60 * 1000 - System.currentTimeMillis() ));

mTime.setText("倒計時："+newStoptime);

break;

}else{

String newStoptime = sdfStopTime.format(new Date(60 * 60 * 1000 - System.currentTimeMillis() ));

mTime.setText("倒計時："+newStoptime);

break;

}

default:

break;

}

}

};

}

總結

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