Android 11 关于按键拦截/按键事件处理分享

最新推荐文章于 2025-05-22 08:00:00 发布

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最新推荐文章于 2025-05-22 08:00:00 发布 · 1k 阅读

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系统在frameworks/base/services/core/java/com/android/server/policy/PhoneWindowManager.java处理按键事件,不管是物理按键还是
SystemUI的nav_bar上的虚拟按键(使用了KeyEvent类中的,比如:KeyEvent.KEYCODE_VOLUME_UP).

主要注意的有两个函数：
interceptKeyBeforeDispatching 分发之前拦截事件

interceptKeyBeforeQueueing 加入队列之前拦截事件

长按物理音量上键弹出重启Dialog,去除Dialog界面部分选项

    @Override
    public long interceptKeyBeforeDispatching(IBinder focusedToken, KeyEvent event,
            int policyFlags) {
        final boolean keyguardOn = keyguardOn();
        final int keyCode = event.getKeyCode();
        final int repeatCount = event.getRepeatCount();
        final int metaState = event.getMetaState();
        final int flags = event.getFlags();
        final boolean down = event.getAction() == KeyEvent.ACTION_DOWN;
        final boolean canceled = event.isCanceled();
        final int displayId = event.getDisplayId();

        if (true) {
            Log.d("tag", "interceptKeyTi keyCode=" + keyCode + " down=" + down + " repeatCount="
                    + repeatCount + " keyguardOn=" + keyguardOn + " canceled=" + canceled);
        }

        //add text
        Log.d("tag", "policyFlags:" + policyFlags);//长按和短按会产生不同的policyFlags
        //短按流程 按下 down=true repeatCount=0 2次  抬起 down=false repeatCount=0
        //长按流程 按下 down=true repeatCount++ 不断自增  抬起 down=false repeatCount=0
        if (keyCode == KeyEvent.KEYCODE_VOLUME_UP) {//1107296256  long  //1644167168 short
            if (policyFlags == 1107296256 || policyFlags == 1644167168) {
                if (repeatCount == 20) {
                    mHandler.removeMessages(MSG_DISPATCH_SHOW_GLOBAL_ACTIONS);
                    mHandler.sendEmptyMessageDelayed(MSG_DISPATCH_SHOW_GLOBAL_ACTIONS, 2000 * 1);
                }
                return -1;
            }
        }
        //add text

        //i