1. 程式人生 > >Android定時器..做天數時間倒計時

Android定時器..做天數時間倒計時

如圖: 

主要的倒計時程式碼如下....從秒判斷起...再判斷分...小時...

    /**
     * 倒計時計算
     */
    private void computeTime() {
        mSecond--;
        if (mSecond < 0) {
            mMin--;
            mSecond = 59;
            if (mMin < 0) {
                mMin = 59;
                mHour--;
                if (mHour < 0) {
                    // 倒計時結束
                    mHour = 23;
                    mDay--;
                    if(mDay < 0){
                        // 倒計時結束
                        mDay = 0;
                        mHour= 0;
                        mMin = 0;
                        mSecond = 0;
                    }
                }
            }
        }
    }


定時器主要程式碼如下...當然也可以開執行緒或者開後臺服務來處理...只是沒那種必要...定時器就可以搞定容易控制...畢竟倒計時時間起點...你總得後臺獲取吧,不是做時鐘鬧鐘...如果是做時鐘鬧鐘...拿你也不用考慮後臺服務或者自己開現場...而是使用AlarmManager來實現

    /**
     * 開啟倒計時
     *  //time為Date型別:在指定時間執行一次。
     *        timer.schedule(task, time);
     *  //firstTime為Date型別,period為long,表示從firstTime時刻開始,每隔period毫秒執行一次。
     *       timer.schedule(task, firstTime,period);
     *  //delay 為long型別:從現在起過delay毫秒執行一次。
     *       timer.schedule(task, delay);
     *  //delay為long,period為long:從現在起過delay毫秒以後,每隔period毫秒執行一次。
     *       timer.schedule(task, delay,period);
     */
    private void startRun() {
        TimerTask mTimerTask = new TimerTask() {
            @Override
            public void run() {
                Message message = Message.obtain();
                message.what = 1;
                timeHandler.sendMessage(message);
            }
        };
        mTimer.schedule(mTimerTask,0,1000);
    }
修改介面,利用handler來提醒更新介面
    private Handler timeHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            if (msg.what == 1) {
                computeTime();
                mDays_Tv.setText(mDay+"");//天數不用補位
                mHours_Tv.setText(getTv(mHour));
                mMinutes_Tv.setText(getTv(mMin));
                mSeconds_Tv.setText(getTv(mSecond));
                if (mSecond == 0 &&  mDay == 0 && mHour == 0 && mMin == 0 ) {
                    mTimer.cancel();
                }
            }
        }
    };

    private String getTv(long l){
        if(l>=10){
            return l+"";
        }else{
            return "0"+l;//小於10,,前面補位一個"0"
        }
    }

附帶主activity的程式碼...
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.RelativeLayout;
import android.widget.TextView;

import java.util.Timer;
import java.util.TimerTask;

public class MainActivity extends AppCompatActivity {

    private RelativeLayout countDown;
    // 倒計時
    private TextView mDays_Tv, mHours_Tv, mMinutes_Tv, mSeconds_Tv;

    private long mDay = 23;// 天
    private long mHour = 11;//小時,
    private long mMin = 56;//分鐘,
    private long mSecond = 32;//秒

    private Timer mTimer;

    private Handler timeHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            if (msg.what == 1) {
                computeTime();
                mDays_Tv.setText(mDay+"");//天數不用補位
                mHours_Tv.setText(getTv(mHour));
                mMinutes_Tv.setText(getTv(mMin));
                mSeconds_Tv.setText(getTv(mSecond));
                if (mSecond == 0 &&  mDay == 0 && mHour == 0 && mMin == 0 ) {
                    mTimer.cancel();
                }
            }
        }
    };

    private String getTv(long l){
        if(l>=10){
            return l+"";
        }else{
            return "0"+l;//小於10,,前面補位一個"0"
        }
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mTimer = new Timer();
        countDown = (RelativeLayout) findViewById(R.id.countdown_layout);
        mDays_Tv = (TextView) findViewById(R.id.days_tv);
        mHours_Tv = (TextView) findViewById(R.id.hours_tv);
        mMinutes_Tv = (TextView) findViewById(R.id.minutes_tv);
        mSeconds_Tv = (TextView) findViewById(R.id.seconds_tv);
        startRun();
    }

    /**
     * 開啟倒計時
     *  //time為Date型別:在指定時間執行一次。
     *        timer.schedule(task, time);
     *  //firstTime為Date型別,period為long,表示從firstTime時刻開始,每隔period毫秒執行一次。
     *       timer.schedule(task, firstTime,period);
     *  //delay 為long型別:從現在起過delay毫秒執行一次。
     *       timer.schedule(task, delay);
     *  //delay為long,period為long:從現在起過delay毫秒以後,每隔period毫秒執行一次。
     *       timer.schedule(task, delay,period);
     */
    private void startRun() {
        TimerTask mTimerTask = new TimerTask() {
            @Override
            public void run() {
                Message message = Message.obtain();
                message.what = 1;
                timeHandler.sendMessage(message);
            }
        };
        mTimer.schedule(mTimerTask,0,1000);
    }

    /**
     * 倒計時計算
     */
    private void computeTime() {
        mSecond--;
        if (mSecond < 0) {
            mMin--;
            mSecond = 59;
            if (mMin < 0) {
                mMin = 59;
                mHour--;
                if (mHour < 0) {
                    // 倒計時結束
                    mHour = 23;
                    mDay--;
                    if(mDay < 0){
                        // 倒計時結束
                        mDay = 0;
                        mHour= 0;
                        mMin = 0;
                        mSecond = 0;
                    }
                }
            }
        }
    }
}

附帶xml的程式碼
<?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:id="@+id/countdown_layout"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:background="@android:color/white"
                android:gravity="center" >

    <RelativeLayout
        android:id="@+id/daojishi_rl"
        android:layout_width="match_parent"
        android:layout_height="40.0dip"
        android:layout_marginLeft="10.0dip"
        android:layout_marginRight="10.0dip"
        android:gravity="center" >

        <ImageView
            android:id="@+id/describe_iv"
            android:layout_width="40dp"
            android:layout_height="40dp"
            android:src="@mipmap/img"
            android:scaleType="fitXY"
            android:gravity="center_vertical" />

        <TextView
            android:id="@+id/describe_tv"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:layout_marginRight="5.0dip"
            android:layout_toRightOf="@+id/describe_iv"
            android:text="距離開團還有"
            android:textSize="25sp" />

        <TextView
            android:id="@+id/days_tv"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:padding="4dp"
            android:layout_toRightOf="@+id/describe_tv"
            android:background="#c2c2c2"
            android:gravity="center"
            android:text=""
            android:textSize="20sp" />

        <TextView
            android:id="@+id/colon0"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:layout_marginLeft="5.0dip"
            android:layout_marginRight="3.0dip"
            android:layout_toRightOf="@+id/days_tv"
            android:text="天"
            android:textSize="20sp"
            android:textStyle="bold" />
    </RelativeLayout>

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/daojishi_rl"
        android:gravity="center_horizontal" >

        <TextView
            android:id="@+id/hours_tv"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:layout_toLeftOf="@+id/colon1"
            android:background="#c2c2c2"
            android:gravity="center"
            android:text="23"
            android:padding="3dp"
            android:textSize="20sp" />

        <TextView
            android:id="@+id/colon1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:layout_marginLeft="3.0dip"
            android:layout_marginRight="3.0dip"
            android:layout_toLeftOf="@+id/minutes_tv"
            android:text=":"
            android:textSize="20sp"
            android:textStyle="bold" />

        <TextView
            android:id="@+id/minutes_tv"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:layout_toLeftOf="@+id/colon2"
            android:background="#c2c2c2"
            android:gravity="center"
            android:text="59"
            android:padding="3dp"
            android:textSize="20sp" />

        <TextView
            android:id="@+id/colon2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:layout_marginLeft="3.0dip"
            android:layout_marginRight="3.0dip"
            android:layout_toLeftOf="@+id/seconds_tv"
            android:text=":"
            android:textSize="20sp"
            android:textStyle="bold" />

        <TextView
            android:id="@+id/seconds_tv"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_centerVertical="true"
            android:background="#c2c2c2"
            android:gravity="center"
            android:text="59"
            android:padding="3dp"
            android:textSize="20sp" />
    </RelativeLayout>

</RelativeLayout>

好了....倒計時完美實現