Home键监听

1 Home键是一个系统的按钮，我们无法通过onKeyDown进行拦截，它是拦截不到的，我们只能得到他在什么时候被按下了。就是通过广播接收者

public class HomeKeyEventBroadCastReceiver extends BroadcastReceiver {
    static final String SYSTEM_REASON = "reason";
    static final String SYSTEM_HOME_KEY = "homekey";
    static final String SYSTEM_RECENT_APPS = "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 (reason != null) {
                if (reason.equals(SYSTEM_HOME_KEY)) {
                    // home key处理点
                } else if (reason.equals(SYSTEM_RECENT_APPS)) {
                    // long home key处理点
                }
            }
        }
    }
}

2 在Activity中去注册这个广播接收者

receiver = new HomeKeyEventBroadCastReceiver();
registerReceiver(receiver, new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS));

3 在Activity销毁的方法中去取消注册

unRegisterReceiver(receiver);