Android之Home键监听封装

jopen 12年前

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);            }

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。            }        }
来自：http://blog.csdn.net/weidi1989/article/details/8953622