【Android】Android 中 Timer用法

如果需要定時做一個動作，用Timer是一個挺方便的選擇，

以下的程式碼在onResume()後以Log定時輸出

System.currentTimeMillis() 直到onPause()停止。

 
package com.example.bert.myapplication;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.Log;
import java.util.Timer;
import java.util.TimerTask;

public class MainActivity extends ActionBarActivity {
    //宣告Timer及TimerTask 
    Timer timer;
    TimerTask timerTask;

    @Override
    protected void onResume() {
        super.onResume();
        startTimer();
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    @Override
    protected void onPause() {
        super.onPause();
        stoptimertask();
    }

    public void startTimer() {

        //set a new Timer
        timer = new Timer();

        //initialize the TimerTask's job
        initializeTimerTask();
        //schedule the timer, after the first 5000ms the TimerTask will run every 10000ms
        timer.schedule(timerTask,5000,10000);

    }

    public void initializeTimerTask() {

        timerTask = new TimerTask() {
            public void run() {

                Log.d("test", String.valueOf(System.currentTimeMillis()));

            }
        };
    }

    public void stoptimertask() {
        //stop the timer, if it's not already null
        if (timer != null) {
            timer.cancel();
            timer = null;
        }
    }
}

執行結果，可以看到log輸出，每間隔10秒的一次輸出