Android Framework layer Power key Shutdown Process (1. Power long button operation), androidframework

Android Framework layer Power key Shutdown Process (1. Power long button operation), androidframework

I. Android powers long-pressed buttons

In the Framework layer, Android4.x analyzes the operation on the Power key (KeyEvent. KEYCODE_POWER) from PhoneWindowManager. Before the analysis, I printed the stack call information of this method. For more information, see.

Public long interceptKeyBeforeDispatching (WindowState win, KeyEvent event, int policyFlags ){

......

Android. util. Log. d ("BILL", android. util. Log. getStackTraceString (new Throwable ()));

......

}

1-13 19:35:32. 458 D/BILL (718): java. lang. Throwable

01-13 19:35:32. 458 D/BILL (718): at com. android. internal. policy. impl. PhoneWindowManager. interceptKeyBeforeDispatching (PhoneWindowManager. java: 2224)

01-13 19:35:32. 458 D/BILL (718): at com. android. server. wm. InputMonitor. interceptKeyBeforeDispatching (InputMonitor. java: 501)

01-13 19:35:32. 458 D/BILL (718): at com. android. server. input. InputManagerService. interceptKeyBeforeDispatching (InputManagerService. java: 1383)

01-13 19:35:32. 458 D/BILL (718): at dalvik. system. NativeStart. run (Native Method)

The call process is as follows (only key code is attached ):

InterceptKeyBeforeDispatching () -->InterceptPowerKeyDown () --> mPowerLongPress. run ()

1>

Public long interceptKeyBeforeDispatching (WindowState win, KeyEvent event, int policyFlags ){

......

Case KeyEvent. KEYCODE_POWER :{
Result & = ~ ACTION_PASS_TO_USER;
If (down ){
MImmersiveModeConfirmation. onPowerKeyDown (isScreenOn, event. getDownTime (),
IsImmersiveMode (mLastSystemUiFlags ));
If (isScreenOn &&! MPowerKeyTriggered
& (Event. getFlags () & KeyEvent. FLAG_FALLBACK) = 0 ){
MPowerKeyTriggered = true;
MPowerKeyTime = event. getDownTime ();
InterceptScreenshotChord ();
}


ITelephony telephonyService = getTelephonyService ();
Boolean hungUp = false;
If (telephonyService! = Null ){
Try {
If (telephonyService. isRinging ()){
// Pressing Power while there's a ringing incoming
// Call shoshould silence the ringer.
TelephonyService. silenceRinger ();
/// M: [ALPS00093981] @ {
} Else if (isScreenOn
| MScreenOffReason = OFF_BECAUSE_OF_PROX_SENSOR)
///@}
& (MIncallPowerBehavior
& Settings. Secure. INCALL_POWER_BUTTON_BEHAVIOR_HANGUP )! = 0
& TelephonyService. isOffhook ()){
// Otherwise, if "Power button ends call" is enabled,
// The Power button will hang up any current active call.
HungUp = telephonyService. endCall ();
}
} Catch (RemoteException ex ){
Log. w (TAG, "ITelephony threw RemoteException", ex );
}
}
InterceptPowerKeyDown (! IsScreenOn | hungUp
| MVolumeDownKeyTriggered | mVolumeUpKeyTriggered );
} Else {
MPowerKeyTriggered = false;
CancelPendingScreenshotChordAction ();
If (InterceptPowerKeyUp(Canceled | mPendingPowerKeyUpCanceled )){
Result = (result &~ ACTION_WAKE_UP) | ACTION_GO_TO_SLEEP;
}
MPendingPowerKeyUpCanceled = false;
}
Break;
}

......

}

Note! Red indicates long-pressed (down), and blue indicates short-pressed (up ).

2>

Private void interceptPowerKeyDown (boolean handled ){
MPowerKeyHandled = handled;
If (! Handled ){
MHandler. postDelayed (MPowerLongPress, ViewConfiguration. getGlobalActionKeyTimeout ());
}
}

3>

Private final Runnable mPowerLongPress = new Runnable (){
......
Case LONG_PRESS_POWER_GLOBAL_ACTIONS:
MPowerKeyHandled = true;
If (! PerformHapticFeedbackLw (null, HapticFeedbackConstants. LONG_PRESS, false )){
Inclumauditoryfeedbackforaccessibilityifneed ();
}
SendCloseSystemWindows (SYSTEM_DIALOG_REASON_GLOBAL_ACTIONS );
ShowGlobalActionsDialog ();
Break;
Case LONG_PRESS_POWER_SHUT_OFF:
Case LONG_PRESS_POWER_SHUT_OFF_NO_CONFIRM:
MPowerKeyHandled = true;
PerformHapticFeedbackLw (null, HapticFeedbackConstants. LONG_PRESS, false );
SendCloseSystemWindows (SYSTEM_DIALOG_REASON_GLOBAL_ACTIONS );
MWindowManagerFuncs. shutdown (resolvedBehavior = LONG_PRESS_POWER_SHUT_OFF );
Break;
......
};

Note: The underline dialog box (shutdown, restart, flight mode, and other options) is displayed.

In android, how can I view the changed effect after the framework layer code is changed?

1. the following method applies to the real machine: Download the android source code, compile the modified framwork code, generate framework. jar, push it to the system/framework directory, and restart the machine! OK

2. The following method is suitable for simulators:
(1) decompress the package with unyaffs. In the sdk directory you downloaded, replace system. img with the framework. jar and compress it into a new system. img. Then, start the simulator and OK.

(2): You can also directly compile the source code and generate system. img to replace system. img in the simulator.

There is a POWER key on the keyboard on the computer, and it shuts down as soon as you press it.

On the Control Panel-power options, there is an option. When you press the power button: The option does not take any operation!
I will give you a picture. WINXP is similar to Windows 7.