Android实现组合键监听功能

来源：互联网发布：常用端口与对应的服务编辑：程序博客网时间：2024/04/29 01:30

有关组合监听的思路：两个键的点击其实是有先后顺序的，要先做第一个键点击的记录，如有时间要求还得记录时间。

下面是两个例子的代码：

例子1：长按音量变大的键，再按回退键一次，处发要处理的事件。

boolean isKeyvolume=false;    @Override    public boolean dispatchKeyEvent(KeyEvent event) {        int eventAction = event.getAction();        int keyCode = event.getKeyCode();        if (eventAction == KeyEvent.ACTION_DOWN && keyCode == KeyEvent.KEYCODE_VOLUME_UP) {            isKeyvolume=true;        }else if(eventAction == KeyEvent.ACTION_UP && keyCode == KeyEvent.KEYCODE_VOLUME_UP){            isKeyvolume=false;        }else if(eventAction == KeyEvent.ACTION_DOWN && keyCode == KeyEvent.KEYCODE_BACK){            if(isKeyvolume){                Toast.makeText(MainActivity.this,"000",Toast.LENGTH_LONG).show();                return true;            }        }        return super.dispatchKeyEvent(event);    }

例子2：长按音量变大的键，再长按回退键，处发要处理的事件。(长按时这个事件会触发多次，如果没有做双击退出应用就会出现退出应用的效果)

int mBackKeyAction, mVolumnUpKeyAction;    long mActionTime;    @Override    public boolean dispatchKeyEvent(KeyEvent event) {        int keyCode = event.getKeyCode();        int action = event.getAction();        if (keyCode == KeyEvent.KEYCODE_VOLUME_UP && event.getAction() == KeyEvent.ACTION_DOWN) {            mVolumnUpKeyAction = KeyEvent.ACTION_DOWN;   //记录按下状态            if (mActionTime == 0) {                mActionTime = System.currentTimeMillis();            }        } else if (keyCode == KeyEvent.KEYCODE_VOLUME_UP && event.getAction() == KeyEvent.ACTION_UP) {            mVolumnUpKeyAction = KeyEvent.ACTION_UP;    //记录松下状态            mActionTime = 0;        }else 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();            }        } else if (keyCode == KeyEvent.KEYCODE_BACK && action == KeyEvent.ACTION_UP) {            mBackKeyAction = KeyEvent.ACTION_UP;  //记录松下状态            mActionTime = 0;        }        //长按，且Back键和音量变大键没松        if (isLongPress() && mBackKeyAction == KeyEvent.ACTION_DOWN && mVolumnUpKeyAction == KeyEvent.ACTION_DOWN) {            //do something            Toast.makeText(MainActivity.this, "TestTest", Toast.LENGTH_SHORT).show();            //事件不下发啦            return true;        }        return super.dispatchKeyEvent(event);    }    private boolean isLongPress() {        if (System.currentTimeMillis() - mActionTime > 2000) {            return true;        } else {            return false;        }    }

0 0