Framework customization series (I) -- systemui NavigationBar slide back to launcher on the navigation bar

1. NavigationBar Slide the solution on the navigation bar

Code path ：frameworks/base/services/core/java/com/android/server/wm/DisplayPolicy.java
notes ：SystemUI Navigationbar Slide up in non hidden state , If there is a need to hide the navigation bar ,height Set to 1dp.

@Override
public void onSwipeFromBottom() {
	if (mNavigationBar != null && mNavigationBarPosition == NAV_BAR_BOTTOM) {
		// Log.d("ljx", "=========onSwipeFromBottom=========");
		//  Slide the relevant function requirement code on the navigation bar and write here .
		requestTransientBars(mNavigationBar);
	}
}

2. give an example NavigationBar Slide up and back on the navigation bar Launcher

Code path ：frameworks/base/services/core/java/com/android/server/wm/DisplayPolicy.java

@Override
public void onSwipeFromBottom() {
	if (mNavigationBar != null && mNavigationBarPosition == NAV_BAR_BOTTOM) {
+		/**add by [email protected] for re