监听方法Android之Home键监听封装

本文是一篇关于监听方法的帖子

尽人皆知，我们监听返回键事件，无法是上面两个方法：

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

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，并作出响应处理呢？其实系统还是给我们发出广播的，上面，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";@Overridepublic 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();}}}}}}}

每日一道理
毅力，是千里大堤一沙一石的凝聚，一点点地累积，才有前不见头后不见尾的壮丽；毅力，是春蚕吐丝一缕一缕的环绕，一丝丝地坚持，才有破茧而出重见光明的辉煌；毅力，是远航的船的帆，有了帆，船才可以到达成功的彼岸。

接下来，我们需要在应用中开启监听，上面是以在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;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);mHomeWatcher = new HomeWatcher(this);mHomeWatcher.setOnHomePressedListener(new OnHomePressedListener() {@Overridepublic void onHomePressed() {Log.e(TAG, "onHomePressed");}@Overridepublic void onHomeLongPressed() {Log.e(TAG, "onHomeLongPressed");}});mHomeWatcher.startWatch();}@Overrideprotected void onPause() {super.onPause();mHomeWatcher.stopWatch();// 在onPause中停止监听，不然会报错的。}}

文章结束给大家分享下程序员的一些笑话语录：腾讯总舵主马化腾，有人曾经戏称如果在Z国选举总统，马化腾一定当选，因为只要QQ来一个弹窗”投马总，送Q币”即可。

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