一个简单的倒计时控件的实现

来源：互联网发布：网络命令ping 编辑：程序博客网时间：2024/06/06 04:03

好久没有写博客了,本来想当做自己的知识库来着,但是有时候不能坚持下来,今天有时间就再来更新下,就写一个简单的倒计时实现,其实没啥难点,Handler+Timer就可以实现.

原理就是:启动一个定时器,每个1秒钟利用handler发送一个请求,然后到handleMessage处理,判断小时,分钟,秒是多少,最后显示到页面上(没有特别难理解的,代码里面就没有写注释,ps:貌似好像也是借鉴的别人的,但是时间有点久远,忘记了)
下面直接上代码吧:
布局文件:

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="com.jiuair.booking.activity.Djs">    <LinearLayout        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:orientation="horizontal"        android:paddingTop="5dp">        <TextView            android:id="@+id/tv_hour"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:background="@drawable/icon_special_tv"            android:gravity="center"            android:text="48"            android:textColor="@color/white"            android:textSize="11sp" />        <TextView            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:gravity="center"            android:paddingLeft="2dp"            android:text="h"            android:textColor="@color/black" />        <TextView            android:id="@+id/tv_min"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_marginLeft="2dp"            android:background="@drawable/icon_special_tv"            android:gravity="center"            android:text="48"            android:textColor="@color/white"            android:textSize="11sp" />        <TextView            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:gravity="center"            android:paddingLeft="2dp"            android:text="m"            android:textColor="@color/black" />        <TextView            android:id="@+id/tv_second"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_marginLeft="2dp"            android:background="@drawable/icon_special_tv"            android:gravity="center"            android:text="48"            android:textColor="@color/white"            android:textSize="11sp" />        <TextView            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:gravity="center"            android:paddingLeft="2dp"            android:text="s"            android:textColor="@color/black" />    </LinearLayout></RelativeLayout>

activity的代码:

package com.jiuair.booking.activity;import android.os.Handler;import android.os.Message;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.widget.LinearLayout;import android.widget.TextView;import com.jiuair.booking.R;import java.util.ArrayList;import java.util.Timer;import java.util.TimerTask;public class Djs extends AppCompatActivity {    private Handler handler;    private int hour;    private int min;    private int second;    private LinearLayout ll_package;    private TextView tv_hour;    private TextView tv_second;    private TextView tv_min;    private Timer timer;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_djs);        handler = new Handler() {            @Override            public void handleMessage(Message msg) {                computeTime();                if (hour <= 0 && min <= 0 && second < 0){                    if (timer != null){                        timer.cancel();                    }                    handler.removeCallbacks(null);                }else{                    tv_hour.setText(hour+"");                    tv_min.setText(min+"");                    tv_second.setText(second+"");                }            }        };        tv_hour = (TextView)findViewById(R.id.tv_hour);        tv_min = (TextView)findViewById(R.id.tv_min);        tv_second = (TextView)findViewById(R.id.tv_second);        ArrayList<Integer> list = new ArrayList<>();        list.add(1);        list.add(1);        list.add(10);        hour = list.get(0);        min = list.get(1);        second = list.get(2);        tv_hour.setText(hour+"");        tv_min.setText(min+"");        tv_second.setText(second+"");        timer = new Timer(true);        timer.schedule(new TimerTask() {            @Override            public void run() {                Message message = new Message();                handler.sendMessage(message);            }        },100,1000);    }    private void computeTime() {        second--;        if (second < 0) {            min--;            second = 59;            if (min < 0) {                min = 59;                hour--;            }        }    }    @Override    public void onDestroy() {        handler.removeCallbacks(null);        if (timer != null){            timer.cancel();        }        super.onDestroy();    }}

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