Android实现组合键监听功能

昨天接到一个任务，要做一下组合键长按监听事件。

由于Android设备是自家的，有点搓，系统代码根本没有区分长按和短按功能。

只能应用层通过diapatchKeyEvent函数实现。

话不多说，代码如下，

 @Override    public boolean dispatchKeyEvent(KeyEvent event) {        int keyCode = event.getKeyCode();        int action = event.getAction();        if (keyCode == KeyEvent.KEYCODE_BACK && action == KeyEvent.ACTION_DOWN) {            mBackKeyAction = KeyEvent.ACTION_DOWN;  //记录按下状态            if(mActionTime == 0 ) {                mActionTime = System.currentTimeMillis();            }        }        if (keyCode == KeyEvent.KEYCODE_BACK && action == KeyEvent.ACTION_UP) {            mBackKeyAction = KeyEvent.ACTION_UP;  //记录松下状态            mActionTime = 0;        }        if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER && event.getAction() == KeyEvent.ACTION_DOWN) {            mOkKeyAction = KeyEvent.ACTION_DOWN;   //记录按下状态            if(mActionTime == 0 ) {                mActionTime = System.currentTimeMillis();            }        }        if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER && event.getAction() == KeyEvent.ACTION_UP) {            mOkKeyAction = KeyEvent.ACTION_UP;    //记录松下状态            mActionTime = 0;        }        //长按，且Back键和OK键没松        if (isLongPress() && mBackKeyAction == KeyEvent.ACTION_DOWN && mOkKeyAction == KeyEvent.ACTION_DOWN) {            //do something        }        return super.dispatchKeyEvent(event);    }        private boolean isLongPress() {        if (System.currentTimeMillis() - mActionTime > 3000) {            return true;        } else {            return false;        }    }

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