Android隨筆之——按鍵長按事件onKeyLongPress

　　現在安卓手機實體鍵是越來越少了，但還是有的，恰好自己就碰上了:按鍵的長按事件...百度了一些博客，內容都基本上是完全一樣的，雖然可以捕獲到長按事件，但卻會和正常的單擊沖突。幸好最近開個VPN，google，耶~正確答案馬上呈現在眼前，特此記錄，以防不時之需。

　　這里我就直接貼谷歌的代碼的，很容易懂，不解釋，原文

private boolean shortPress = false;

@Override
public boolean onKeyLongPress(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN) {
        shortPress = false;
        Toast.makeText(this, "longPress", Toast.LENGTH_LONG).show();
        return true;
    }
    //Just return false because the super call does always the same (returning false)
    return false;
}

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN) {
        if(event.getAction() == KeyEvent.ACTION_DOWN){
            event.startTracking();
            if(event.getRepeatCount() == 0){
                shortPress = true;
            }
            return true;
        }
    }
    return super.onKeyDown(keyCode, event);
}

@Override
public boolean onKeyUp(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN) {
        if(shortPress){
            Toast.makeText(this, "shortPress", Toast.LENGTH_LONG).show();
        } else {
            //Don't handle longpress here, because the user will have to get his finger back up first
        }
        shortPress = false;
        return true;
    }
    return super.onKeyUp(keyCode, event);
}