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
   “`java
   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”;

   @Overridepublic 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);

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