android获取键盘高度

方案一:监听布局高度变化，使用屏幕高度减去可用高度，剩余高度即键盘高度

private ViewTreeObserver.OnGlobalLayoutListener mOnGlobalLayoutListener = new ViewTreeObserver.OnGlobalLayoutListener() {
        public void onGlobalLayout() {
            possiblyResizeChildOfContent();
        }
    };

private void possiblyResizeChildOfContent() {
        int usableHeightNow = computeUsableHeight();
        int heightDifference;
        if (usableHeightNow != mUsableHeightPrevious) {
            int usableHeightSansKeyboard = mContentView.getRootView().getHeight();
            heightDifference = usableHeightSansKeyboard - usableHeightNow;

            if (heightDifference > 200) {
                // keyboard probably just became visible
                mContentView.setPadding(0, 0, 0, heightDifference);
            } else {
                // keyboard probably just became hidden
                mContentView.setPadding(0, 0, 0, 0);

                
            }

            mUsableHeightPrevious = usableHeightNow;
        }
    }

    private int computeUsableHeight() {
        final Rect rect = new Rect();
        mContentView.getWindowVisibleDisplayFrame(rect);
        return rect.bottom - rect.top;
    }

方案二:通过android api30以上提供的新api获取

 @RequiresApi(api = Build.VERSION_CODES.R)
    private void windowInsets() {
        mContentView.setOnApplyWindowInsetsListener(new View.OnApplyWindowInsetsListener() {

            @Override
            public WindowInsets onApplyWindowInsets(View v, WindowInsets insets) {
                int bottom = insets.getInsets(WindowInsets.Type.ime()).bottom;
                mContentView.setPadding(0, 0, 0, bottom);
              
                if (SDKLog.isDebugLoggable())
                    SDKLog.d(TAG, "ime top:" + insets.getInsets(WindowInsets.Type.ime()).top +
                            " bottom:" + insets.getInsets(WindowInsets.Type.ime()).bottom);
                return insets;
            }
        });
    }