Android 左右滑屏，实现Back按键

左右滑屏，实现Back按键

思路：
	1.下拉快捷弹框如何实现，input事件处理
	2.back按钮事件接口调用
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下拉分发事件代码路径：

• /frameworks/base/services/core/java/com/android/server/wm/WindowManagerService.java
• frameworks/base/services/core/java/com/android/server/wm/RootWindowContainer.java
• frameworks/base/services/core/java/com/android/server/wm/DisplayContent.java
• frameworks/base/services/core/java/com/android/server/wm/DisplayPolicy.java
• /frameworks/base/services/core/java/com/android/server/wm/SystemGesturesPointerEventListener.java

SystemGesturesPointerEventListener.java

@Override
public void onPointerEvent(MotionEvent event) {
    if (mGestureDetector != null && event.isTouchEvent()) {
        mGestureDetector.onTouchEvent(event);
    }
    switch (event.getActionMasked()) {
        case MotionEvent.ACTION_DOWN:
            mSwipeF
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