昨天需要处理一个问题，需要监听home键。最开始想到使用onKeydonwn这个方法。但是发现home不能这样处理，onKeydonwn可以处理菜单键和back键，但home不能。因为home键是系统键，情况特殊一些。
看了一下网上的资料，说下面的方法可以。（其实不行）
@Override
public void onAttachedToWindow() {
// TODO Auto-generated method stub
Log.d("aeon","onAttachedToWindow");
this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);
super.onAttachedToWindow();
}
加了权限之后也不行。
<uses-permission android:name="android.permission.DISABLE_KEYGUARD" >
</uses-permission>
实验几次之后（android4.1 和android4.2）发现在单个的activity里面有以下几个方法可以使用：
方法1：onSaveInstanceState方法
下面这个方法可以处理home的监听问题。
protected void onSaveInstanceState(Bundle outState)
但这个方法不是很好，不推荐
方法2：onUserLeaveHint方法
@Override
protected void onUserLeaveHint() {
Log.d("aeon","onUserLeaveHint");
super.onUserLeaveHint();
}
这个方法会在onSaveInstanceState之前执行，根据api的解释，这个方法还比较合适的。
方法3：ACTION_CLOSE_SYSTEM_DIALOGS
在使用广播监听方面可以使用ACTION_CLOSE_SYSTEM_DIALOGS
//注册Receiver
HomeKeyEventBroadCastReceiver receiver = new HomeKeyEventBroadCastReceiver();
registerReceiver(receiver, new IntentFilter(
Intent. ACTION_CLOSE_SYSTEM_DIALOGS));
方法4：framework PhoneWindowManager.java 处理
想要完全监听home键需要在framework层去处理。
/frameworks/base/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
里面去修改private void handleLongPressOnHome() 这个方法。
private void handleLongPressOnHome() {
// We can't initialize this in init() since the configuration hasn't been loaded yet.
if (mLongPressOnHomeBehavior < 0) {
mLongPressOnHomeBehavior
= mContext.getResources().getInteger(R.integer.config_longPressOnHomeBehavior);
if (mLongPressOnHomeBehavior < LONG_PRESS_HOME_NOTHING ||
mLongPressOnHomeBehavior > LONG_PRESS_HOME_RECENT_SYSTEM_UI) {
mLongPressOnHomeBehavior = LONG_PRESS_HOME_NOTHING;
}
}
if (mLongPressOnHomeBehavior != LONG_PRESS_HOME_NOTHING) {
performHapticFeedbackLw(null, HapticFeedbackConstants.LONG_PRESS, false);
sendCloseSystemWindows(SYSTEM_DIALOG_REASON_RECENT_APPS);
// Eat the longpress so it won't dismiss the recent apps dialog when
// the user lets go of the home key
mHomeLongPressed = true;
}
if (mLongPressOnHomeBehavior == LONG_PRESS_HOME_RECENT_DIALOG) {
showOrHideRecentAppsDialog(RECENT_APPS_BEHAVIOR_SHOW_OR_DISMISS);
} else if (mLongPressOnHomeBehavior == LONG_PRESS_HOME_RECENT_SYSTEM_UI) {
try {
IStatusBarService statusbar = getStatusBarService();
if (statusbar != null) {
statusbar.toggleRecentApps();
}
} catch (RemoteException e) {
Slog.e(TAG, "RemoteException when showing recent apps", e);
// re-acquire status bar service next time it is needed.
mStatusBarService = null;
}
}
}
只要把handleLongPressOnHome里面做出相对应的处理就ok