Android之Home键监听封装

众所周知，我们监听返回键事件，无法是下面两个方法：

@Override      public void onBackPressed() {          //do something          //super.onBackPressed();      }            @Override      public boolean onKeyDown(int keyCode, KeyEvent event) {          if(keyCode == KeyEvent.KEYCODE_BACK){              //do something          }          return super.onKeyDown(keyCode, event);      }

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于是乎，我们理所当然的想到，监听Home键的方法是：if(keyCode == KeyEvent.KEYCODE_HOME)。

但实际上，这样是行不通的，因为此时home键的消息在framework层就已经被拦截，所以，我们在应用中通过此方法是无法监听到Home键的消息的。

那么我们如何捕获Home键事件，并作出相应处理呢？其实系统还是给我们发出广播的，下面，就跟大家分享一下，封装好了的监听Home键的方法：

HomeWatcher类：

/**  * Home键监听封装  *   * @author way  *   */  public class HomeWatcher {        static final String TAG = "HomeWatcher";      private Context mContext;      private IntentFilter mFilter;      private OnHomePressedListener mListener;      private InnerRecevier mRecevier;        // 回调接口      public interface OnHomePressedListener {          public void onHomePressed();            public void onHomeLongPressed();      }        public HomeWatcher(Context context) {          mContext = context;          mFilter = new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);      }        /**      * 设置监听      *       * @param listener      */      public void setOnHomePressedListener(OnHomePressedListener listener) {          mListener = listener;          mRecevier = new InnerRecevier();      }        /**      * 开始监听，注册广播      */      public void startWatch() {          if (mRecevier != null) {              mContext.registerReceiver(mRecevier, mFilter);          }      }        /**      * 停止监听，注销广播      */      public void stopWatch() {          if (mRecevier != null) {              mContext.unregisterReceiver(mRecevier);          }      }        /**      * 广播接收者      */      class InnerRecevier extends BroadcastReceiver {          final String SYSTEM_DIALOG_REASON_KEY = "reason";          final String SYSTEM_DIALOG_REASON_GLOBAL_ACTIONS = "globalactions";          final String SYSTEM_DIALOG_REASON_RECENT_APPS = "recentapps";          final String SYSTEM_DIALOG_REASON_HOME_KEY = "homekey";            @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_DIALOG_REASON_KEY);                  if (reason != null) {                      Log.e(TAG, "action:" + action + ",reason:" + reason);                      if (mListener != null) {                          if (reason.equals(SYSTEM_DIALOG_REASON_HOME_KEY)) {                              // 短按home键                              mListener.onHomePressed();                          } else if (reason                                  .equals(SYSTEM_DIALOG_REASON_RECENT_APPS)) {                              // 长按home键                              mListener.onHomeLongPressed();                          }                      }                  }              }          }      }  }  
接下来，我们需要在应用中开启监听，下面是以在Activity中的应用为例：

/**  * 应用HomeWatcher小例  *   * @author way  *   */  public class MainActivity extends Activity {      private static final String TAG = "MainActivity";      private HomeWatcher mHomeWatcher;        @Override      protected void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);          setContentView(R.layout.activity_main);            mHomeWatcher = new HomeWatcher(this);          mHomeWatcher.setOnHomePressedListener(new OnHomePressedListener() {              @Override              public void onHomePressed() {                  Log.e(TAG, "onHomePressed");              }                @Override              public void onHomeLongPressed() {                  Log.e(TAG, "onHomeLongPressed");              }          });          mHomeWatcher.startWatch();      }        @Override      protected void onPause() {          super.onPause();          mHomeWatcher.stopWatch();// 在onPause中停止监听，不然会报错的。      }  }

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