Android PhoneWindowManager监听屏幕右侧向左滑动实现返回功能

由于项目没有设计返回键，一旦进入别的应用，就无法回到桌面。只能通过串口输入input keyevent 4（返回键）来返回桌面，为了方便调试，在Framework 中监听手势，实现返回功能。

在frameworksbaseservicescorejavacomandroidserverpolicyPhoneWindowManager中有这么一段代码

mSystemGestures = new SystemGesturesPointerEventListener(context,new SystemGesturesPointerEventListener.Callbacks() { @Override public void onSwipeFromTop() { Log.i('gyx','onSwipeFromTop'); if (mStatusBar != null) { requestTransientBars(mStatusBar); } } @Override public void onSwipeFromBottom() { Log.i('gyx','onSwipeFromBottom'); if (mNavigationBar != null && mNavigationBarPosition == NAV_BAR_BOTTOM) { requestTransientBars(mNavigationBar); } } @Override public void onSwipeFromRight() { Log.i('gyx','onSwipeFromRight'); sendKeyCode(4); Log.i('gyx','sendKeyCode 4'); if (mNavigationBar != null && mNavigationBarPosition == NAV_BAR_RIGHT) { requestTransientBars(mNavigationBar); } } @Override public void onSwipeFromLeft() { Log.i('gyx','onSwipeFromLeft'); if (mNavigationBar != null && mNavigationBarPosition == NAV_BAR_LEFT) { requestTransientBars(mNavigationBar); } } @Override public void onFling(int duration) { if (mPowerManagerInternal != null) { mPowerManagerInternal.powerHint( PowerHint.INTERACTION, duration); } } @Override public void onDebug() { // no-op } @Override public void onDown() { mOrientationListener.onTouchStart(); } @Override public void onUpOrCancel() { mOrientationListener.onTouchEnd(); } @Override public 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); } @Override public 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); } @Override public void onMouseLeaveFromEdge() { mHandler.removeMessages(MSG_REQUEST_TRANSIENT_BARS); }});

代码中监听了手势操作，其中onSwipeFromRight()就是当从屏幕的右侧向左滑动时会触发，只要在这里加入返回的功能即可；

实现返回按键的功能代码如下

private void sendKeyCode(final int keyCode) { new Thread(new Runnable() { @Override public void run() {try { // 创建一个Instrumentation对象 Instrumentation inst = new Instrumentation(); // 调用inst对象的按键模拟方法 inst.sendKeyDownUpSync(keyCode);} catch (Exception e) { e.printStackTrace();} } }).start(); }

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