Android 事件触发机制的深入学习

 android 事件触发机制的深入学习

最近在研究android的事件触发和传播机制，说来很惭愧，web下的事件太熟悉不过了，可在android中却很郁闷，常用的触摸事件都糊里糊涂的，在网上看了半天，也整理一份，供大家参考：

public class customdefaultactivity implements ontouchlistener { 
  private gesturedetector gd1; 
  private tablelayout tablelayout; 
 
  @override 
  protected void oncreate(bundle savedinstancestate) { 
    super.oncreate(savedinstancestate); 
    setcontentview(r.layout.custom_default); 
    tablelayout = (tablelayout) findviewbyid(r.id.tablelayout); 
    gd1 = new gesturedetector(customdefaultactivity.this, new mygesture()); 
    tablelayout.setontouchlistener(this); 
    tablelayout.setlongclickable(true); 
  } 
 
  @override 
  public boolean dispatchtouchevent(motionevent event) { 
    log.e("-----------------------------------------------------------------------", 
      "dispatchtouchevent"); 
 
    if (gd1.ontouchevent(event)) { 
      event.setaction(motionevent.action_cancel); 
    } 
 
    return super.dispatchtouchevent(event); 
  } 
 
  @override 
  public boolean ontouch(view arg0, motionevent arg1) { 
    log.e("-------", "ontouch"); 
 
    return gd1.ontouchevent(arg1); 
  } 
 
  public class mygesture implements ongesturelistener { 
    @override 
    public boolean ondown(motionevent arg0) { 
      log.e("-------", 
        "ondown, 按下时触发[" + arg0.getx() + "," + arg0.gety() + "]"); 
 
      return true; 
    } 
 
    @override 
    public void onlongpress(motionevent arg0) { 
      log.e("-------", "onlongpress,长时间按住时触发"); 
    } 
 
    @override 
    public boolean onscroll(motionevent arg0, motionevent arg1, float arg2, 
      float arg3) { 
      log.e("-------", 
        "onscroll,滑动拖动事件[" + arg0.getx() + "," + arg0.gety() + "]=[" + 
        arg1.getx() + "," + arg1.gety() + "]"); 
 
      return true; 
    } 
 
    @override 
    public boolean onfling(motionevent arg0, motionevent arg1, float arg2, 
      float arg3) { 
      log.e("-------", "onfling, 滑动甩出事件"); 
 
      return true; 
    } 
 
    @override 
    public void onshowpress(motionevent arg0) { 
      log.e("-------", "onshowpress,down事件发生,而move或up还没发生前触发该事件"); 
    } 
 
    @override 
    public boolean onsingletapup(motionevent arg0) { 
      log.e("-------", "onsingletapup 释放事件"); 
 
      return true; 
    } 
  } 
} 

监控触摸事件，主要是实现ongesturelistener类，并重写其中的几个方法，以监听事件发生。

感谢阅读，希望能帮助到大家，谢谢大家对本站的支持！