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";

   @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 java 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 java unRegisterReceiver(receiver);

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