标签：on() action_up class 重写 接收 turn rate key pre
在activity中重写了dispatchKeyEvent事件，不论最后返回TRUE还是FALSE都不会执行onKeyDown事件了么？
找到的一些资料却不是这样解释的：
当键盘按下时
首先触发dispatchKeyEvent
然后触发onUserInteraction
再次onKeyDown
如果按下紧接着松开，则是俩步
紧跟着触发dispatchKeyEvent
然后触发onUserInteraction
再次onKeyUp
dispatchKeyEvent是做按键处理和分发的工作，如果你想要onKeyDown还可以接收到应该这样实现
public boolean dispatchKeyEvent(KeyEvent event){
return super.dispatchKeyEvent(event);
}
代码测试如下：
在dispatchKeyEvent(KeyEvent event)中按键的按下抬起都会进行操作，在处理完一个按键操作时无论return true 还是 false ，onKeyDown(int keyCode, KeyEvent event)和onKeyUp(int keyCode, KeyEvent event)都不会再进行按键处理：
第1种情况及log信息：
public void DEBUG(String str) {
Log.d(TAG, str);
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
// TODO Auto-generated method stub
DEBUG(" onKeyDown " + keyCode );
return super.onKeyDown(keyCode, event);
}
@Override
public boolean onKeyLongPress(int keyCode, KeyEvent event) {
// TODO Auto-generated method stub
DEBUG(" onKeyLongPress " + keyCode );
return super.onKeyLongPress(keyCode, event);
}
@Override
public boolean dispatchKeyEvent(KeyEvent event) {
// TODO Auto-generated method stub
DEBUG(" dispatchKeyEvent 1 key = " + event.getKeyCode() + " event = " + event.getAction());
if(event.getAction()==KeyEvent.ACTION_DOWN){
DEBUG(" dispatchKeyEvent 2 ACTION_DOWN" + event.getKeyCode() );
return super.dispatchKeyEvent(event);
}
if(event.getAction()==KeyEvent.ACTION_UP){
DEBUG(" dispatchKeyEvent 3 ACTION_UP" + event.getKeyCode() );
return super.dispatchKeyEvent(event);
}
return super.dispatchKeyEvent(event);
}
@Override
public boolean onKeyUp(int keyCode, KeyEvent event) {
// TODO Auto-generated method stub
DEBUG(" onKeyUp " + keyCode);
return super.onKeyUp(keyCode, event);
}
D/ testMainActivity ( 853): dispatchKeyEvent 1 key = 23 event = 0
D/ testMainActivity ( 853): dispatchKeyEvent 2 ACTION_DOWN23
D/ testMainActivity ( 853): onKeyDown 23
D/ testMainActivity ( 853): dispatchKeyEvent 1 key = 23 event = 1
D/ testMainActivity ( 853): dispatchKeyEvent 3 ACTION_UP23
D/ testMainActivity ( 853): onKeyUp 23
标签：on() action_up class 重写 接收 turn rate key pre
原文地址：http://www.cnblogs.com/ganchuanpu/p/6562013.html
