监听接口 OnKeyboardListener.java
public interface OnKeyboardListener {void onKeyboardHidden();void onKeyboardShow(int keyboardHeight);}KeyBoardUtil.java
public class KeyBoardUtil {private final static String TAG = "KeyBoardUtil";public PopupWindow popupWindow;public static void showSoftInput(EditText edit) {edit.setFocusable(true);edit.setFocusableInTouchMode(true);edit.requestFocus();InputMethodManager imm = (InputMethodManager) edit.getContext().getSystemService(Context.INPUT_METHOD_SERVICE);imm.showSoftInput(edit, 0);edit.setSelection(edit.length());}public static void hideSoftInput(EditText edit) {InputMethodManager imm = (InputMethodManager) edit.getContext().getSystemService(Context.INPUT_METHOD_SERVICE);imm.hideSoftInputFromWindow(edit.getWindowToken(), 0);}private ViewTreeObserver.OnGlobalLayoutListener onGlobalLayoutListener;public void observerKeyboard(Activity activity, OnKeyboardListener keyboardListener) {View rootView = new View(activity);popupWindow = new PopupWindow(activity);try {rootView.setLayoutParams(new ViewGroup.LayoutParams(0, ViewGroup.LayoutParams.MATCH_PARENT));popupWindow.setContentView(rootView);popupWindow.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE | WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE);popupWindow.setInputMethodMode(PopupWindow.INPUT_METHOD_NEEDED);popupWindow.setBackgroundDrawable(new ColorDrawable(0));popupWindow.setTouchable(false);popupWindow.showAtLocation(activity.getWindow().getDecorView(), Gravity.NO_GRAVITY, 0, 0);} catch (WindowManager.BadTokenException e) {Log.d(TAG, "observerKeyboard: " , e);}if (onGlobalLayoutListener == null) {onGlobalLayoutListener = getGlobalObserver(rootView, keyboardListener);}rootView.getViewTreeObserver().addOnGlobalLayoutListener(onGlobalLayoutListener);}private ViewTreeObserver.OnGlobalLayoutListener getGlobalObserver(View rootView, OnKeyboardListener keyboardListener) {HeightWrapper wrapper = new HeightWrapper();Rect rootRect = new Rect();Context context = rootView.getContext();((Activity)context).getWindow().getDecorView().getWindowVisibleDisplayFrame(rootRect);return () -> {Rect r = new Rect();rootView.getWindowVisibleDisplayFrame(r);int height = r.height();if (wrapper.getHeight() == 0) {wrapper.setHeight(height);} else {if (wrapper.getHeight() != height){Log.i(TAG,"keyboard wrapper height = "+wrapper.getHeight() + "heigth = "+height);int diff = wrapper.getHeight() - height;if (diff < -200 && rootRect.bottom == r.bottom) {keyboardListener.onKeyboardHidden();}else {keyboardListener.onKeyboardShow(ScreenUtils.getScreenRealHeight() - r.bottom);}wrapper.setHeight(height);}}};}public void clearObserver() {onGlobalLayoutListener = null;if (popupWindow != null) {popupWindow.dismiss();popupWindow.getContentView().getViewTreeObserver().removeOnGlobalLayoutListener(onGlobalLayoutListener);}popupWindow = null;}static class HeightWrapper {int height = 0;public int getHeight() {return height;}public void setHeight(int height) {this.height = height;}}}在activity 中初始化完UI以后，添加如下代码：
view.viewTreeObserver.addOnGlobalLayoutListener {if (mKeyBoardUtil == null) {mKeyBoardUtil = KeyBoardUtil()mKeyBoardUtil?.observerKeyboard(requireActivity(),object : KeyBoardUtil.OnKeyboardListener {override fun onKeyboardHidden() {Log.i(TAG, "onKeyboardHidden")}override fun onKeyboardShow(keyboardHeight: Int) {Log.i(TAG, "onKeyboardShow")}})}}在activity ondestory中调用：
mKeyBoardUtil?.clearObserver()
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