//contentlayout是最外层布局View mChildOfContent;int usableHeightPrevious;mChildOfContent = contentlayout.getChildAt(0);mChildOfContent.getViewTreeObserver()               .addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {                      public void onGlobalLayout() {   

                    Rect r = new Rect();                           mChildOfContent.getWindowVisibleDisplayFrame(r);                        int usableHeightNow = r.bottom - r.top;                        if (usableHeightNow != usableHeightPrevious) {                                int usableHeightSansKeyboard = mChildOfContent.getRootView().getHeight();                               int heightDifference = usableHeightSansKeyboard - usableHeightNow;                               if (heightDifference > (usableHeightSansKeyboard / 4)) {                                       // 键盘弹出                                } else {                                        // 键盘收起                                 }                           mChildOfContent.requestLayout();                           usableHeightPrevious = usableHeightNow;                    }            }});

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