菜鳥進階筆記|實作時分秒的倒計時效果

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="離結束時間為：" />

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_marginTop="10dp"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/tvtime1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:layout_centerVertical="true"
            android:background="#3B3B3B"
            android:gravity="center"
            android:text="12"
            android:textColor="#FFFFFF"
            android:textSize="30sp" />

        <TextView
            android:id="@+id/tvtime2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:layout_centerVertical="true"
            android:layout_marginLeft="10dp"
            android:background="#3B3B3B"
            android:gravity="center"
            android:text="12"
            android:textColor="#FFFFFF"
            android:textSize="30sp" />

        <TextView
            android:id="@+id/tvtime3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:layout_centerVertical="true"
            android:layout_marginLeft="10dp"
            android:background="#3B3B3B"
            android:gravity="center"
            android:text="13"
            android:textColor="#FFFFFF"
            android:textSize="30sp" />
    </LinearLayout>
</LinearLayout>
           

MainActivity.class

package com.test.test_hour_miniuts_seconds;

import android.os.Bundle;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    private TextView tvtime1, tvtime2, tvtime3;
    private long time = 400;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tvtime1 = (TextView) findViewById(R.id.tvtime1);
        tvtime2 = (TextView) findViewById(R.id.tvtime2);
        tvtime3 = (TextView) findViewById(R.id.tvtime3);
        handler.postDelayed(runnable, 1000);
    }

    Handler handler = new Handler();
    Runnable runnable = new Runnable() {
        @Override
        public void run() {
            time--;
            String formatLongToTimeStr = formatLongToTimeStr(time);
            String[] split = formatLongToTimeStr.split("：");
            for (int i = 0; i < split.length; i++) {
                if (i == 0) {
                    tvtime1.setText(split[0] + " 小時 ");
                }
                if (i == 1) {
                    tvtime2.setText(split[1] + " 分鐘 ");
                }
                if (i == 2) {
                    tvtime3.setText(split[2] + " 秒 ");
                }

            }
            if (time > 0) {
                handler.postDelayed(this, 1000);
            }
        }
    };

    public String formatLongToTimeStr(Long l) {
        int hour = 0;
        int minute = 0;
        int second = 0;
        second = l.intValue();
        if (second > 60) {
            minute = second / 60;         //取整
            second = second % 60;         //取餘
        }

        if (minute > 60) {
            hour = minute / 60;
            minute = minute % 60;
        }
        String strtime = hour + "：" + minute + "：" + second;
        return strtime;
    }
}