監聽軟鍵盤是否彈出

監聽軟鍵盤是否彈出
很多情況下我們會用到監聽軟鍵盤彈出的需求（以下方法親測有效）：
https://blog.csdn.net/hello201404/article/details/81111082
新建實現類

/**
 * 監聽軟鍵盤是否彈出
 * Created by DELL on 2018/7/19.
 */
public class KeyboardChangeListener implements ViewTreeObserver.OnGlobalLayoutListener {
    private static final String TAG = "ListenerHandler";
    private View mContentView;
    private int mOriginHeight;
    private int mPreHeight;
    private KeyBoardListener mKeyBoardListen;

    public interface KeyBoardListener {
        /**
         * call back
         *
         * @param isShow         true is show else hidden
         * @param keyboardHeight keyboard height
         */
        void onKeyboardChange(boolean isShow, int keyboardHeight);
    }

    public void setKeyBoardListener(KeyBoardListener keyBoardListen) {
        this.mKeyBoardListen = keyBoardListen;
    }

    public KeyboardChangeListener(Activity contextObj) {
        if (contextObj == null) {
            return;
        }
        mContentView = findContentView(contextObj);
        if (mContentView != null) {
            addContentTreeObserver();
        }
    }

    private View findContentView(Activity contextObj) {
        return contextObj.findViewById(android.R.id.content);
    }

    private void addContentTreeObserver() {
        mContentView.getViewTreeObserver().addOnGlobalLayoutListener(this);
    }

    @Override
    public void onGlobalLayout() {
        int currHeight = mContentView.getHeight();
        if (currHeight == 0) {
            return;
        }
        boolean hasChange = false;
        if (mPreHeight == 0) {
            mPreHeight = currHeight;
            mOriginHeight = currHeight;
        } else {
            if (mPreHeight != currHeight) {
                hasChange = true;
                mPreHeight = currHeight;
            } else {
                hasChange = false;
            }
        }
        if (hasChange) {
            boolean isShow;
            int keyboardHeight = 0;
            if (mOriginHeight == currHeight) {
                //hidden
                isShow = false;
            } else {
                //show
                keyboardHeight = mOriginHeight - currHeight;
                isShow = true;
            }

            if (mKeyBoardListen != null) {
                mKeyBoardListen.onKeyboardChange(isShow, keyboardHeight);
            }
        }
    }

}

之後這麼用就可以了

 KeyboardChangeListener softKeyboardStateHelper = new KeyboardChangeListener(this);
        softKeyboardStateHelper.setKeyBoardListener(new KeyboardChangeListener.KeyBoardListener() {
            @Override
            public void onKeyboardChange(boolean isShow, int keyboardHeight) {
                if (isShow) {
                    //鍵盤的彈出
                    et_seartch.setCursorVisible(true);
                } else {
                    //鍵盤的收起
                    et_seartch.setCursorVisible(false);
                }
            }
        });