[移动开发]android关于软键盘Utils

1.软键盘的使用

1.显示隐藏软键盘

获取系统服务类，让服务类来操作

private InputMethodManager utilInputMethodManager;

utilInputMethodManager = (InputMethodManager) MainActivity.this.getSystemService(Context.INPUT_METHOD_SERVICE);

1.显示隐藏：

隐藏

utilInputMethodManager.hideSoftInputFromWindow(etTest.getWindowToken(),0);

显示

utilInputMethodManager.showSoftInput(etTest,0);

2.区别：

共同点：都是两个参数，都是editText
不同点：第一个是EditText，另一个是EditText.getWindowToken();

2.软键盘问题

1.软键盘遮挡键盘问题

getActivity().getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_PAN);//解决EditText被键盘遮挡问题

3.软键盘封装类

键盘显示隐藏监听，键盘显示隐藏

/**
 * 创建日期：2021/8/19 13:59
 *
 * @author tony.sun
 * 类说明：
 */

public class UtilKeyboardStateObserver {
    private static Activity activity;


    private static final String TAG = UtilKeyboardStateObserver.class.getSimpleName();

    public static UtilKeyboardStateObserver getKeyboardStateObserver(Activity activity) {
        return new UtilKeyboardStateObserver(activity);
    }
    private static InputMethodManager utilInputMethodManager;
    private View mChildOfContent;
    private int usableHeightPrevious;
    private OnKeyboardVisibilityListener listener;
    //显示键盘
    public static void show(Activity activity, EditText et) {
        utilInputMethodManager= (InputMethodManager) activity.getSystemService(Context.INPUT_METHOD_SERVICE);
        utilInputMethodManager.showSoftInput(et,0);
    }
    //隐藏键盘
    public static void hide(Activity activity, EditText et) {
        utilInputMethodManager= (InputMethodManager) activity.getSystemService(Context.INPUT_METHOD_SERVICE);
        utilInputMethodManager.hideSoftInputFromWindow(et.getWindowToken(),0);
    }
    //这个是软键盘显示隐藏的监听
    public void setKeyboardVisibilityListener(OnKeyboardVisibilityListener listener) {
        this.listener = listener;
    }

    private UtilKeyboardStateObserver(Activity activity) {
        FrameLayout content = (FrameLayout) activity.findViewById(android.R.id.content);
        mChildOfContent = content.getChildAt(0);
        mChildOfContent.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            public void onGlobalLayout() {
                possiblyResizeChildOfContent();
            }
        });
    }

    private void possiblyResizeChildOfContent() {
        int usableHeightNow = computeUsableHeight();
        if (usableHeightNow != usableHeightPrevious) {
            int usableHeightSansKeyboard = mChildOfContent.getRootView().getHeight();
            int heightDifference = usableHeightSansKeyboard - usableHeightNow;
            if (heightDifference > (usableHeightSansKeyboard / 4)) {
                if (listener != null) {
                    listener.onKeyboardShow();
                }
            } else {
                if (listener != null) {
                    listener.onKeyboardHide();
                }
            }
            usableHeightPrevious = usableHeightNow;
            Log.d(TAG,"usableHeightNow: " + usableHeightNow + " | usableHeightSansKeyboard:" + usableHeightSansKeyboard + " | heightDifference:" + heightDifference);
        }
    }

    private int computeUsableHeight() {
        Rect r = new Rect();
        mChildOfContent.getWindowVisibleDisplayFrame(r);

        Log.d(TAG,"rec bottom>" + r.bottom + " | rec top>" + r.top);
        return (r.bottom - r.top);// 全屏模式下： return r.bottom
    }

    public interface OnKeyboardVisibilityListener {
        void onKeyboardShow();

        void onKeyboardHide();
    }
}