yescpu / keyboardchangelistener Goto Github PK

public class CqrKeyboardListen implements ViewTreeObserver.OnGlobalLayoutListener {
    private View contentView;
    private int originVisibleH;
    private OnKeyboardListener onKeyboardListener;

    private CqrKeyboardListen(Activity activity, OnKeyboardListener listener) {
        if (activity == null) {
            return;
        }
        activity.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE
                | WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN);
        onKeyboardListener = listener;
        contentView = activity.findViewById(android.R.id.content);
        if (contentView != null) {
            contentView.getViewTreeObserver().addOnGlobalLayoutListener(this);
        }
    }

    public static CqrKeyboardListen listen(Activity activity, OnKeyboardListener listener) {
        return new CqrKeyboardListen(activity, listener);
    }

    @Override
    public void onGlobalLayout() {
        if (onKeyboardListener == null) {
            return;
        }
        //布局变化，获取当前根视图在屏幕上显示的高度
        Rect rect = new Rect();
        contentView.getWindowVisibleDisplayFrame(rect);
        int currentVisibleH = rect.height();
        if (originVisibleH == 0) {
            originVisibleH = currentVisibleH;
        }
        int diffHeight = originVisibleH - currentVisibleH;
        //CqrLogPrinter.printLog("originVisibleH=" + originVisibleH + ",currentVisibleH="
        //        + currentVisibleH + ",diffHeight=" + diffHeight);
        if (diffHeight > 200) {
            //根视图显示高度变小超过200，可以看作软键盘显示了
            onKeyboardListener.onKeyboardChange(true, diffHeight);
            originVisibleH = currentVisibleH;
            return;
        }
        if (diffHeight < -200) {
            //根视图显示高度变大超过200，可以看作软键盘隐藏了
            onKeyboardListener.onKeyboardChange(false, diffHeight);
            originVisibleH = currentVisibleH;
        }
    }

    /**
     * 在{@link Activity#onDestroy()}中调用，防止内存泄漏
     */
    public void destroy() {
        if (contentView != null) {
            CqrCompatUtils.removeOnGlobalLayoutListener(contentView, this);
        }
    }

    public interface OnKeyboardListener {
        void onKeyboardChange(boolean isShow, int keyboardHeight);
    }

}

     keyboardListen = CqrKeyboardListen.listen(activity, new CqrKeyboardListen.OnKeyboardListener() {
            @Override
            public void onKeyboardChange(boolean isShow, int keyboardHeight) {
                // DO SOMETHING
            }
        });

    @Override
    protected void onDestroy() {
        super.onDestroy();
        keyboardListen.destroy();
    }