Android监听Home键按下

只需要实现这么一个广播接收器就OK。如果是在onKeyDown()里面进行判断，并不能很好的判断是短按返回到了桌面，还是长按查看最近应用列表

private BroadcastReceiver mHomeKeyEventReceiver = new BroadcastReceiver() {    String SYSTEM_REASON = "reason";    String SYSTEM_HOME_KEY = "homekey";    String SYSTEM_HOME_KEY_LONG = "recentapps";    @Override    public void onReceive(Context context, Intent intent) {        String action = intent.getAction();        if (action.equals(Intent.ACTION_CLOSE_SYSTEM_DIALOGS)) {            String reason = intent.getStringExtra(SYSTEM_REASON);            if (TextUtils.equals(reason, SYSTEM_HOME_KEY)) {                 //表示按了home键,程序到了后台            }else if(TextUtils.equals(reason, SYSTEM_HOME_KEY_LONG)){                //表示长按home键,显示最近使用的程序列表            }        }     }};

注册广播接收器

registerReceiver(mHomeKeyEventReceiver, new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS));