Rotate the screen with buttons in Android

Http://blog.csdn.net/linweig/article/details/6205142

The Home key on Android is directly processed by the system and has the following functions:

1: Go to the home page. If the home process is dead, restart the home process.
2: press for 5 seconds. The application selection window is displayed. You can switch the application.
As needed, I need to modify some of the logic here. The modified logic cannot be released, and the approximate location I found is released here.
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Public Boolean interceptkeyti (windowstate win, int code, int metakeys, Boolean down,
Int repeatcount, int flags ){
Boolean keyguardon = keyguardon ();
If (false ){
Log. D (TAG, "interceptkeyti code =" + code + "down =" + down + "repeatcount ="
+ Repeatcount + "keyguardon =" + keyguardon + "mhomepressed =" + mhomepressed );
}
// Clear a pending home longpress if the user releases home
// Todo: This cocould probably be inside the next bit of logic, but that code
// Turned out to be a bit fragile so I'm doing it here explicitly, for now.
If (code = keyevent. keycode_home )&&! Down ){
Mhandler. removecallbacks (mhomelongpress );
}
// If the Home button is currently being held, then we do special
// Chording with it.
If (mhomepressed ){

// If we have released the Home key, and didn't do anything else
// While it was pressed, then it is time to go home!
If (code = keyevent. keycode_home ){
If (! Down ){
Mhomepressed = false;

If (flags & keyevent. flag_canceled) = 0 ){
// If an incoming call is ringing, home is totally disabled.
// (The user is already on the incallscreen at this point,
// And his only options are to answer or reject the call .)
Boolean incomingringing = false;
Try {
Itelephony phoneserv = getphoneinterface ();
If (phoneserv! = NULL ){
Incomingringing = phoneserv. isringing ();
} Else {
Log. W (TAG, "unable to find itelephony interface ");
}
} Catch (RemoteException ex ){
Log. W (TAG, "RemoteException from getphoneinterface ()", ex );
}

If (incomingringing ){
Log. I (TAG, "ignoring home; there's a ringing incoming call .");
} Else {
Launchhomefromhotkey ();
}
} Else {
Log. I (TAG, "ignoring home; event canceled .");
}
}
}

Return true;
}

// First we always handle the Home key here, So applications
// Can never break it, although if keyguard is on, we do let
// It handle it, because that gives us the correct 5 second
// Timeout.
If (code = keyevent. keycode_home ){
// If a system window has focus, then it doesn't make sense
// Right now to interact with applications.
Windowmanager. layoutparams attrs = win! = NULL? Win. getattrs (): NULL;
If (attrs! = NULL ){
Final int type = attrs. type;
If (type = windowmanager. layoutparams. type_keyguard
| Type = windowmanager. layoutparams. type_keyguard_dialog ){
// The "app" is keyguard, so give it the key
Return false;
}
Final int typecount = window_types_where_home_doesnt_work.length;
For (INT I = 0; I <typecount; I ++ ){
If (type = window_types_where_home_doesnt_work [I]) {
// Don't do anything, but also don't pass it to the app
Return true;
}
}
}

If (down & repeatcount = 0 ){
If (! Keyguardon ){
Mhandler. postdelayed (mhomelongpress, viewconfiguration. getglobalactionkeytimeout ());
}
Mhomepressed = true;
}
Return true;
}
Public Boolean interceptkeyti (windowstate win, int code, int metakeys, Boolean down,
Int repeatcount, int flags ){
Boolean keyguardon = keyguardon ();
If (false ){
Log. D (TAG, "interceptkeyti code =" + code + "down =" + down + "repeatcount ="
+ Repeatcount + "keyguardon =" + keyguardon + "mhomepressed =" + mhomepressed );
}
// Clear a pending home longpress if the user releases home
// Todo: This cocould probably be inside the next bit of logic, but that code
// Turned out to be a bit fragile so I'm doing it here explicitly, for now.
If (code = keyevent. keycode_home )&&! Down ){
Mhandler. removecallbacks (mhomelongpress );
}
// If the Home button is currently being held, then we do special
// Chording with it.
If (mhomepressed ){

// If we have released the Home key, and didn't do anything else
// While it was pressed, then it is time to go home!
If (code = keyevent. keycode_home ){
If (! Down ){
Mhomepressed = false;

If (flags & keyevent. flag_canceled) = 0 ){
// If an incoming call is ringing, home is totally disabled.
// (The user is already on the incallscreen at this point,
// And his only options are to answer or reject the call .)
Boolean incomingringing = false;
Try {
Itelephony phoneserv = getphoneinterface ();
If (phoneserv! = NULL ){
Incomingringing = phoneserv. isringing ();
} Else {
Log. W (TAG, "unable to find itelephony interface ");
}
} Catch (RemoteException ex ){
Log. W (TAG, "RemoteException from getphoneinterface ()", ex );
}

If (incomingringing ){
Log. I (TAG, "ignoring home; there's a ringing incoming call .");
} Else {
Launchhomefromhotkey ();
}
} Else {
Log. I (TAG, "ignoring home; event canceled .");
}
}
}

Return true;
}

// First we always handle the Home key here, So applications
// Can never break it, although if keyguard is on, we do let
// It handle it, because that gives us the correct 5 second
// Timeout.
If (code = keyevent. keycode_home ){
// If a system window has focus, then it doesn't make sense
// Right now to interact with applications.
Windowmanager. layoutparams attrs = win! = NULL? Win. getattrs (): NULL;
If (attrs! = NULL ){
Final int type = attrs. type;
If (type = windowmanager. layoutparams. type_keyguard
| Type = windowmanager. layoutparams. type_keyguard_dialog ){
// The "app" is keyguard, so give it the key
Return false;
}
Final int typecount = window_types_where_home_doesnt_work.length;
For (INT I = 0; I <typecount; I ++ ){
If (type = window_types_where_home_doesnt_work [I]) {
// Don't do anything, but also don't pass it to the app
Return true;
}
}
}

If (down & repeatcount = 0 ){
If (! Keyguardon ){
Mhandler. postdelayed (mhomelongpress, viewconfiguration. getglobalactionkeytimeout ());
}
Mhomepressed = true;
}
Return true;
}
Some code is posted in frameworks/policies/base/phone/COM/Android/Internal/policy/impl/phonewindowmanager. java includes special buttons, including special buttons in Android, search, and other special keys.
The Home key logic is roughly analyzed as follows:
1: If you press the Home key, a timer is started, specifically the mhomelongpress object in it. If it exceeds 5 s, a window for app switching is displayed.
2: When you release the Home key, it is regarded as the standalone time. Now, some floating modal windows in the system are closed. The specific code is:
Sendclosesystemwindows (system_dialog_reason_home_key );
3: After closing the modal window, start or switch the home application. Code:
Startdockorhome
The code I have added cannot be released here. If you have such a requirement, You can manually add it here.