android處理鼠標滾輪事件,并不是如下函數:
?
1) ?public boolean onKeyDown(int keyCode, KeyEvent event) ?
2) ? ??public boolean dispatchKeyEvent(KeyEvent event)?
3) ? ??public boolean onTouchEvent(MotionEvent event)
?
而是如下函數
?
publicboolean onGenericMotionEvent(MotionEvent event);
?
所有View和Activity都可重寫該函數,來自己處理滾輪事件,
如下代碼:
/**
* Implement this method to handle generic motion events.
* 實現該方法來處理一般的MotionEvent;
* 一般的motion events 描述,操縱桿的動作,鼠標honver、滾輪等
*
* @param event The generic motion event being processed.
* @return True if the event was handled, false otherwise.
*/
@Override
public boolean onGenericMotionEvent(MotionEvent event) {
//The input source is a pointing device associated with a display.
//輸入源為可顯示的指針設備,如:mouse pointing device(鼠標指針),stylus pointing device(尖筆設備)
if (0 != (event.getSource() & InputDevice.SOURCE_CLASS_POINTER)) {
switch (event.getAction()) {
// process the scroll wheel movement...處理滾輪事件
case MotionEvent.ACTION_SCROLL:
//獲得垂直坐標上的滾動方向,也就是滾輪向下滾
if( event.getAxisValue(MotionEvent.AXIS_VSCROLL) < 0.0f){
Log.i("fortest::onGenericMotionEvent", "down" );
}
//獲得垂直坐標上的滾動方向,也就是滾輪向上滾
else{
Log.i("fortest::onGenericMotionEvent", "up" );
}
return true;
}
}
return super.onGenericMotionEvent(event);
}
轉載請注明出處,jiese1990