Android 监听键盘弹起落下

最新推荐文章于 2023-02-06 18:03:38 发布

原创最新推荐文章于 2023-02-06 18:03:38 发布 · 671 阅读

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#Android #键盘弹起落下 #ViewTreeObserver.OnGlobalLayou

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本文介绍了一个用于监听键盘显示状态变化的Java类实现。该类通过监听全局布局变化来判断软键盘是否弹出，并提供回调通知键盘的状态变化及高度。适用于需要响应键盘弹出隐藏的应用场景。

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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) {
        Log.i(TAG, "contextObj is 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) {
        Log.i(TAG, "currHeight is 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);
        }
    }
}

public void destroy() {
    if (mContentView != null) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
            mContentView.getViewTreeObserver().removeOnGlobalLayoutListener(this);
        }
    }
}

}

调用

KeyboardChangeListener mKeyboardChangeListener = new KeyboardChangeListener(this);
    mKeyboardChangeListener.setKeyBoardListener(new KeyboardChangeListener.KeyBoardListener() {
        @Override
        public void onKeyboardChange(boolean isShow, int keyboardHeight) {
            if (isShow) {
                smoothBottom();
            }
        }
    });