package com.hdl.photovoltaic.utils;
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import android.app.Activity;
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import android.graphics.Rect;
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import android.view.View;
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import android.view.ViewTreeObserver;
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import android.widget.FrameLayout;
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/**
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* 键盘状态观察员
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*/
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public class KeyboardStateObserverUtils {
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private static final String TAG = KeyboardStateObserverUtils.class.getSimpleName();
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public static KeyboardStateObserverUtils getKeyboardStateObserver(Activity activity) {
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return new KeyboardStateObserverUtils(activity);
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}
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private final View mChildOfContent;
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private int usableHeightPrevious;//使用高度
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private OnKeyboardVisibilityListener listener;
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public void setKeyboardVisibilityListener(OnKeyboardVisibilityListener listener) {
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this.listener = listener;
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}
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private KeyboardStateObserverUtils(Activity activity) {
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// activity.getWindow().findViewById(window);
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FrameLayout content = (FrameLayout) activity.findViewById(android.R.id.content);
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mChildOfContent = content.getChildAt(0);
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//获取视图树观察者,添加全局布局监听器
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mChildOfContent.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
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public void onGlobalLayout() {
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possiblyResizeChildOfContent();
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}
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});
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}
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/**
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* 重新设置ChildOfContent的大小
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*/
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private void possiblyResizeChildOfContent() {
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int usableHeightNow = computeUsableHeight();
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if (usableHeightNow != usableHeightPrevious) {
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//获取整个屏幕的高度
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int usableHeightSansKeyboard = mChildOfContent.getRootView().getHeight();
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int heightDifference = usableHeightSansKeyboard - usableHeightNow;
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if (heightDifference > (usableHeightSansKeyboard / 4)) {
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if (listener != null) {
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listener.onKeyboardShow(heightDifference);
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}
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} else {
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if (listener != null) {
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listener.onKeyboardHide(heightDifference);
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}
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}
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usableHeightPrevious = usableHeightNow;
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//Log.d(TAG,"usableHeightNow: " + usableHeightNow + " | usableHeightSansKeyboard:" + usableHeightSansKeyboard + " | heightDifference:" + heightDifference);
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}
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}
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/**
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* 计算可用高度
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*
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* @return 高度
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*/
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private int computeUsableHeight() {
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Rect r = new Rect();
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//获取可以显示的区域
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mChildOfContent.getWindowVisibleDisplayFrame(r);
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//Log.d(TAG,"rec bottom>" + r.bottom + " | rec top>" + r.top);
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return (r.bottom - r.top);// 全屏模式下： return r.bottom
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}
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public interface OnKeyboardVisibilityListener {
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void onKeyboardShow(int h);
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void onKeyboardHide(int h);
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}
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}
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