安卓8.1源码桌面NavBar的电源按钮事件触发流程
### 桌面NavBar的电源按钮事件触发流程
在systemui中，frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarFragment.java中的poweroffClick方法中发送Intent.ACTION_SYSTEMUI_FIREFLY_POWEROFF广播
```
private void poweroffClick(View v) {
Intent intent=new Intent(Intent.ACTION_SYSTEMUI_FIREFLY_POWEROFF);
getContext().sendBroadcast(intent);
}
```
PhoneWindowManager接收广播调用showGlobalActionsInternal()方法
```
void showGlobalActionsInternal() {
sendCloseSystemWindows(SYSTEM_DIALOG_REASON_GLOBAL_ACTIONS);
if (mGlobalActions == null) {
mGlobalActions = new GlobalActions(mContext, mWindowManagerFuncs);
}
final boolean keyguardShowing = isKeyguardShowingAndNotOccluded();
mGlobalActions.showDialog(keyguardShowing, isDeviceProvisioned());
if (keyguardShowing) {
// since it took two seconds of long press to bring this up,
// poke the wake lock so they have some time to see the dialog.
mPowerManager.userActivity(SystemClock.uptimeMillis(), false);
}
}
```
PowerManager
```
public void userActivity(long when, int event, int flags) {
try {
mService.userActivity(when, event, flags);
} catch (RemoteException e) {
throw e.rethrowFromSystemServer();
}
}
```
PowerManagerService
```
@Override // Binder call
public void userActivity(long eventTime, int event, int flags) {
final long now = SystemClock.uptimeMillis();
if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DEVICE_POWER)
!= PackageManager.PERMISSION_GRANTED
&& mContext.checkCallingOrSelfPermission(
android.Manifest.permission.USER_ACTIVITY)
!= PackageManager.PERMISSION_GRANTED) {
// Once upon a time applications could call userActivity().
// Now we require the DEVICE_POWER permission.Log a warning and ignore the
// request instead of throwing a SecurityException so we don't break old apps.
synchronized (mLock) {
if (now >= mLastWarningAboutUserActivityPermission + (5 * 60 * 1000)) {
mLastWarningAboutUserActivityPermission = now;
Slog.w(TAG, "Ignoring call to PowerManager.userActivity() because the "
+ "caller does not have DEVICE_POWER or USER_ACTIVITY "
+ "permission.Please fix your app!"
+ " pid=" + Binder.getCallingPid()
+ " uid=" + Binder.getCallingUid());
}
}
return;
}
if (eventTime > now) {
throw new IllegalArgumentException("event time must not be in the future");
}
final int uid = Binder.getCallingUid();
final long ident = Binder.clearCallingIdentity();
try {
userActivityInternal(eventTime, event, flags, uid);
} finally {
Binder.restoreCallingIdentity(ident);
}
}
``` {:4_122:}
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