原文地址:http://blog.csdn.net/way_ping_li/article/details/8953622,作者:weidi1989 感謝分享。
衆所周知,我們監聽返回鍵事件,無非是下面兩個方法:
- @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);
- }
於是乎,我們理所當然的想到,監聽Home鍵的方法是:if(keyCode == KeyEvent.KEYCODE_HOME)。但實際上,這樣是行不通的,因爲此時home鍵的消息在framework層就已經被攔截,所以,我們在應用中通過此方法是無法監聽到Home鍵的消息的。那麼我們如何捕獲Home鍵事件,並作出相應處理呢?其實系統還是給我們發出廣播的,下面,就跟大家分享一下,封裝好了的監聽Home鍵的方法:
HomeWatcher類:
- /**
- * Home鍵監聽封裝
- *
- * @author way
- *
- */
- public class HomeWatcher {
- static final String TAG = "HomeWatcher";
- private Context mContext;
- private IntentFilter mFilter;
- private OnHomePressedListener mListener;
- private InnerRecevier mRecevier;
- // 回調接口
- public interface OnHomePressedListener {
- public void onHomePressed();
- public void onHomeLongPressed();
- }
- public HomeWatcher(Context context) {
- mContext = context;
- mFilter = new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
- }
- /**
- * 設置監聽
- *
- * @param listener
- */
- public void setOnHomePressedListener(OnHomePressedListener listener) {
- mListener = listener;
- mRecevier = new InnerRecevier();
- }
- /**
- * 開始監聽,註冊廣播
- */
- public void startWatch() {
- if (mRecevier != null) {
- mContext.registerReceiver(mRecevier, mFilter);
- }
- }
- /**
- * 停止監聽,註銷廣播
- */
- public void stopWatch() {
- if (mRecevier != null) {
- mContext.unregisterReceiver(mRecevier);
- }
- }
- /**
- * 廣播接收者
- */
- 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鍵
- mListener.onHomePressed();
- } else if (reason
- .equals(SYSTEM_DIALOG_REASON_RECENT_APPS)) {
- // 長按home鍵
- mListener.onHomeLongPressed();
- }
- }
- }
- }
- }
- }
- }
接下來,我們需要在應用中開啓監聽,下面是以在Activity中的應用爲例:
- /**
- * 應用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中停止監聽,不然會報錯的。
- }
- }