home键监听

public class BaseActivity extends Activity {    private HomeWatcherReceiver mHomeWatcherReceiver = null;    private boolean isNeedFinish = false;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        registerReceiver();    }    private void registerReceiver() {        mHomeWatcherReceiver = new HomeWatcherReceiver();        IntentFilter filter = new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);        registerReceiver(mHomeWatcherReceiver, filter);    }    public class HomeWatcherReceiver extends BroadcastReceiver {        private static final String SYSTEM_DIALOG_REASON_KEY = "reason";        private static final String SYSTEM_DIALOG_REASON_HOME_KEY = "homekey";        @Override        public void onReceive(Context context, Intent intent) {            String intentAction = intent.getAction();            //L.e("intentAction =" + intentAction);            if (TextUtils.equals(intentAction, Intent.ACTION_CLOSE_SYSTEM_DIALOGS)) {                String reason = intent.getStringExtra(SYSTEM_DIALOG_REASON_KEY);                //L.e("reason =" + reason);                if (TextUtils.equals(SYSTEM_DIALOG_REASON_HOME_KEY, reason)) {                    L.e("按下了home键");                    if (!spUtil.getFromSp("home_down_back", false)) {                        spUtil.saveToSp("home_down_back", true);                    }                }            }        }    }@Override    protected void onResume() {        super.onResume();        if (spUtil.getFromSp("home_down_back", false)) {//防止activity之间跳转的时候走这里            L.e("home down back");            spUtil.saveToSp("home_down_back", false);        }    }    @Override    protected void onDestroy() {        super.onDestroy();        if (mHomeWatcherReceiver != null) {            try {                unregisterReceiver(mHomeWatcherReceiver);            }            catch (Exception e) {                e.printStackTrace();            }        }    }}