利用PostDelay实现的简单好用的timer类（android)

最新推荐文章于 2023-03-19 22:48:36 发布

wapysun

最新推荐文章于 2023-03-19 22:48:36 发布

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文章标签：移动开发

本文介绍了一个基于Android的自定义Timer类实现方式，该类利用Handler和Runnable实现周期性的任务调度。通过设置间隔时间和回调方法，可以轻松实现如文本视图闪烁等效果。

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利用PostDelay实现的Timer类，代码如下：

import android.os.Handler;

public class Timer { 
  private int _interval; 
  public int getInterval() { return _interval; } 
  public void setInterval(int delay) { _interval = delay; } 
  private Handler handler; 
  private Runnable _tickHandler; 
  private Runnable delegate; 
  private boolean ticking; 
  public boolean getIsTicking(){ return ticking; } 
  
  public Timer(int interval) 
  { 
    _interval = interval; 
    handler = new Handler(); 
  } 
  
  public Timer(int interval, Runnable onTickHandler) 
  { 
    _interval = interval; 
    setOnTickHandler(onTickHandler); 
    handler = new Handler(); 
  } 
  
  public void start(int interval, Runnable onTickHandler) 
  { 
    if (ticking) return; 
    _interval = interval; 
    setOnTickHandler(onTickHandler); 
    handler.postDelayed(delegate, _interval); 
    ticking = true; 
  } 
  
  public void start() 
  { 
    if (ticking) return; 
    handler.postDelayed(delegate, _interval); 
    ticking = true; 
  } 
  
  public void stop() 
  { 
    handler.removeCallbacks(delegate); 
    ticking = false; 
  } 
  
  public void setOnTickHandler(Runnable onTickHandler) 
  { 
    if (onTickHandler == null) 
      return; 
    
    _tickHandler = onTickHandler; 
    
    delegate = new Runnable() { 
      public void run() 
      { 
        if (_tickHandler == null) return; 
        _tickHandler.run(); 
        handler.postDelayed(delegate, _interval); 
      } 
    }; 
  } 
}

用法如下：

boolean blinkOn = false; 
  Timer tmrBlink = new Timer(500, new Runnable() { 

    public void run() { 
      if (blinkOn) 
      { 
        ((TextView) findViewById(R.id.widget46)).setVisibility(View.VISIBLE); 
      } 
      else 
      { 
        ((TextView) findViewById(R.id.widget46)).setVisibility(View.INVISIBLE); 
      } 
      blinkOn = !blinkOn; 
    } 
    
  });
  
  tmrBlink.start();