Android全屏中adjustResize的失效的解决方案 AndroidBug5497Workaround

最近做项目中遇到Android全屏中adjustResize失效的问题，网上搜索了一堆后，基本上都是使用AndroidBug5497Workaround这个工具类，但是在实际使用中遇到软键盘不弹出时，整体高度不正确的问题。看了工具类的代码后，觉得计算全屏高度的方式有些绕了，既然Activity已经全屏，索性直接将屏幕高度作为软键盘不弹出的高度。代码如下：

package com.kunpeng.util;import android.app.Activity;import android.graphics.Rect;import android.os.Build.VERSION;import android.os.Build.VERSION_CODES;import android.view.View;import android.view.ViewTreeObserver;import android.widget.FrameLayout;/** * 用于解决全屏时，Activity设置了adjustSize却不起作用的问题。setContentView之后调用{@link #assistActivity(Activity)} */public class AndroidBug5497Workaround {    // For more information, see https://code.google.com/p/android/issues/detail?id=5497    // To use this class, simply invoke assistActivity() on an Activity that already has its content view set.    public static void assistActivity (Activity activity) {        new AndroidBug5497Workaround(activity);    }    private Activity activity;    private View mChildOfContent;    private int usableHeightPrevious;    private FrameLayout.LayoutParams frameLayoutParams;    private int screenHeight;    private AndroidBug5497Workaround(Activity activity) {        this.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();            }        });        frameLayoutParams = (FrameLayout.LayoutParams) mChildOfContent.getLayoutParams();        screenHeight = activity.getResources().getDisplayMetrics().heightPixels;    }    private void possiblyResizeChildOfContent() {        int usableHeightNow = computeUsableHeight();        if (usableHeightNow != usableHeightPrevious) {//            int usableHeightSansKeyboard = mChildOfContent.getRootView().getHeight();            int usableHeightSansKeyboard = screenHeight;            //这个判断是为了解决19之前的版本不支持沉浸式状态栏导致布局显示不完全的问题            if(VERSION.SDK_INT < VERSION_CODES.KITKAT){                int statusBarHeight = getStatusBarHeight();                usableHeightSansKeyboard -= statusBarHeight;            }            int heightDifference = usableHeightSansKeyboard - usableHeightNow;            if (heightDifference > (usableHeightSansKeyboard/4)) {                // keyboard probably just became visible                frameLayoutParams.height = usableHeightSansKeyboard - heightDifference;            } else {                // keyboard probably just became hidden                frameLayoutParams.height = usableHeightSansKeyboard;            }            mChildOfContent.requestLayout();            usableHeightPrevious = usableHeightNow;        }    }    private int getStatusBarHeight() {        Rect frame = new Rect();        activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);        return frame.top;    }    private int computeUsableHeight() {        int statusBarHeight = getStatusBarHeight();        Rect r = new Rect();        mChildOfContent.getWindowVisibleDisplayFrame(r);        //这个判断是为了解决19之后的版本在弹出软键盘时，键盘和推上去的布局（adjustResize）之间有黑色区域的问题        if(VERSION.SDK_INT >= VERSION_CODES.KITKAT){            return (r.bottom - r.top)+statusBarHeight;        }        return (r.bottom - r.top);    }}

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