需求：在11.0 12.0的定制化开发系统手势功能的时候，客户需求要求在上滑手势的时候，在底部上滑时候进入系统桌面，也就是增加 home键功能 就可以实现这个功能了

1. 系统上滑手势增加home的功能的核心类

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

2. 系统上滑手势增加home的功能的核心功能分析和实现

首选在找到11.0的系统手势具体处理类DisplayPolicy.java 就是系统处理手势的

而主要是靠mSystemGestures 来负责监听手势事件，然后处理上滑下滑左右滑事件

路径为:frameworks/base/services/core/java/com/android/server/wm/DisplayPolicy.java

2.1DisplayPolicy.java关于手势事件分析

mSystemGestures = new SystemGesturesPointerEventListener(mContext, mHandler,new SystemGesturesPointerEventListener.Callbacks() {@Overridepublic void onSwipeFromTop() {if (mStatusBar != null) {requestTransientBars(mStatusBar);}}@Overridepublic void onSwipeFromBottom() {if (mNavigationBar != null && mNavigationBarPosition == NAV_BAR_BOTTOM) {requestTransientBars(mNavigationBar);}}@Overridepublic void onSwipeFromRight() {final Region excludedRegion = Region.obtain();synchronized (mLock) {mDisplayContent.calculateSystemGestureExclusion(excludedRegion, null /* outUnrestricted */);}final boolean sideAllowed = mNavigationBarAlwaysShowOnSideGesture|| mNavigationBarPosition == NAV_BAR_RIGHT;if (mNavigationBar != null && sideAllowed&& !mSystemGestures.currentGestureStartedInRegion(excludedRegion)) {requestTransientBars(mNavigationBar);}excludedRegion.recycle();}@Overridepublic void onSwipeFromLeft() {final Region excludedRegion = Region.obtain();synchronized (mLock) {mDisplayContent.calculateSystemGestureExclusion(excludedRegion, null /* outUnrestricted */);}final boolean sideAllowed = mNavigationBarAlwaysShowOnSideGesture|| mNavigationBarPosition == NAV_BAR_LEFT;if (mNavigationBar != null && sideAllowed&& !mSystemGestures.currentGestureStartedInRegion(excludedRegion)) {requestTransientBars(mNavigationBar);}excludedRegion.recycle();}@Overridepublic void onFling(int duration) {if (mService.mPowerManagerInternal != null) {mService.mPowerManagerInternal.powerHint(PowerHint.INTERACTION, duration);}}@Overridepublic void onDebug() {// no-op}private WindowOrientationListener getOrientationListener() {final DisplayRotation rotation = mDisplayContent.getDisplayRotation();return rotation != null ? rotation.getOrientationListener() : null;}@Overridepublic void onDown() {final WindowOrientationListener listener = getOrientationListener();if (listener != null) {listener.onTouchStart();}}@Overridepublic void onUpOrCancel() {final WindowOrientationListener listener = getOrientationListener();if (listener != null) {listener.onTouchEnd();}}@Overridepublic void onMouseHoverAtTop() {mHandler.removeMessages(MSG_REQUEST_TRANSIENT_BARS);Message msg = mHandler.obtainMessage(MSG_REQUEST_TRANSIENT_BARS);msg.arg1 = MSG_REQUEST_TRANSIENT_BARS_ARG_STATUS;mHandler.sendMessageDelayed(msg, 500 /* delayMillis */);}@Overridepublic void onMouseHoverAtBottom() {mHandler.removeMessages(MSG_REQUEST_TRANSIENT_BARS);Message msg = mHandler.obtainMessage(MSG_REQUEST_TRANSIENT_BARS);msg.arg1 = MSG_REQUEST_TRANSIENT_BARS_ARG_NAVIGATION;mHandler.sendMessageDelayed(msg, 500 /* delayMillis */);}@Overridepublic void onMouseLeaveFromEdge() {mHandler.removeMessages(MSG_REQUEST_TRANSIENT_BARS);}});displayContent.registerPointerEventListener(mSystemGestures);displayContent.mAppTransition.registerListenerLocked(mStatusBarController.getAppTransitionListener());mImmersiveModeConfirmation = new ImmersiveModeConfirmation(mContext, looper,mService.mVrModeEnabled);mAcquireSleepTokenRunnable = () -> {if (mWindowSleepToken != null) {return;}mWindowSleepToken = service.mAtmInternal.acquireSleepToken("WindowSleepTokenOnDisplay" + displayId, displayId);};mReleaseSleepTokenRunnable = () -> {if (mWindowSleepToken == null) {return;}mWindowSleepToken.release();mWindowSleepToken = null;};// TODO: Make it can take screenshot on external displaymScreenshotHelper = displayContent.isDefaultDisplay? new ScreenshotHelper(mContext) : null;if (mDisplayContent.isDefaultDisplay) {mHasStatusBar = true;mHasNavigationBar = mContext.getResources().getBoolean(R.bool.config_showNavigationBar);// Allow a system property to override this. Used by the emulator.// See also hasNavigationBar().String navBarOverride = SystemProperties.get("qemu.hw.mainkeys");if ("1".equals(navBarOverride)) {mHasNavigationBar = false;} else if ("0".equals(navBarOverride)) {mHasNavigationBar = true;}} else {mHasStatusBar = false;mHasNavigationBar = mDisplayContent.supportsSystemDecorations();}mRefreshRatePolicy = new RefreshRatePolicy(mService,mDisplayContent.getDisplayInfo(),mService.mHighRefreshRateBlacklist);}

在上面代码发现DisplayPolicy中的

SystemGesturesPointerEventListener就是具体处理系统手势的 onSwipeFromBottom()、

就是上滑事件的处理 所以就在这里增加Home事件就可以了，就可以模拟home功能

具体修改如下:

--- a/frameworks/base/services/core/java/com/android/server/wm/DisplayPolicy.java+++ b/frameworks/base/services/core/java/com/android/server/wm/DisplayPolicy.java@@ -178,11 +178,11 @@ import com.android.server.policy.WindowOrientationListener;import com.android.server.statusbar.StatusBarManagerInternal;import com.android.server.wallpaper.WallpaperManagerInternal;import com.android.server.wm.utils.InsetUtils;-+import android.view.KeyEvent;import java.io.PrintWriter;//unisoc: For Power Hintimport android.os.PowerHintVendorSprd;-+import android.provider.Settings;/*** The policy that provides the basic behaviors and states of a display to show UI.*/@@ -472,6 +472,7 @@ public class DisplayPolicy extends AbsDisplayPolicy {if (mStatusBar != null) {requestTransientBars(mStatusBar);}+}@Override@@ -488,6 +489,17 @@ public class DisplayPolicy extends AbsDisplayPolicy {updateShowHideNavSettings(true);}}+                                          //add code start+                                                 long now = SystemClock.uptimeMillis();+                          KeyEvent down =  new KeyEvent(now, now,KeyEvent.ACTION_DOWN, 3, 0);+                          KeyEvent up = new KeyEvent(now, now,KeyEvent.ACTION_UP, 3, 0);+                          InputManager.getInstance().injectInputEvent(down, InputManager.INJECT_INPUT_EVENT_MODE_ASYNC);+                                                 InputManager.getInstance().injectInputEvent(up, InputManager.INJECT_INPUT_EVENT_MODE_ASYNC);+                                           //add code end}

然后编译services.jar 替换就可以了