webview中软键盘弹出挡住输入框

//键盘弹出输入框向上移的代码是下面这个链接里的

https://stackoverflow.com/questions/7417123/android-how-to-adjust-layout-in-full-screen-mode-when-softkeyboard-is-visible/19494006#19494006

//在oncreate()里初始化

new AndroidBug5497Workaround(this);//也可以和h5交互，封装到方法中，供h5调用。个人建议写个方法给h5页面去调用比较好

public class AndroidBug5497Workaround {//键盘弹出输入框向上移

    // 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.

    //new AndroidBug5497Workaround(activity);
    private View mChildOfContent;
    private int usableHeightPrevious;
    private FrameLayout.LayoutParams frameLayoutParams;

    private AndroidBug5497Workaround(final 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(activity);
            }
        });
        frameLayoutParams = (FrameLayout.LayoutParams) mChildOfContent.getLayoutParams();
    }

    private void possiblyResizeChildOfContent(final Activity activity) {
        int usableHeightNow = computeUsableHeight();
        if (usableHeightNow != usableHeightPrevious) {
            int usableHeightSansKeyboard = mChildOfContent.getRootView().getHeight();
            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 - getNavigationBarHeight(activity);
            }
            mChildOfContent.requestLayout();
            usableHeightPrevious = usableHeightNow;
        }
    }

    private int computeUsableHeight() {
        Rect r = new Rect();
        mChildOfContent.getWindowVisibleDisplayFrame(r);
        return (r.bottom - r.top);// 全屏模式下： return r.bottom
    }

}

public int getNavigationBarHeight(Context context) {//获取虚拟按键的高度
    int result = 0;
    if (hasNavBar(context)) {
        if (isNavigationBarShow()){//返回true获取虚拟按键的高度
            Resources res = context.getResources();
            int resourceId = res.getIdentifier("navigation_bar_height", "dimen", "android");
            if (resourceId > 0) {
                result = res.getDimensionPixelSize(resourceId);
            }
        }

    }
    return result;
}
/**
 * 检查是否存在虚拟按键栏
 */
@TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
public static boolean hasNavBar(Context context) {
    Resources res = context.getResources();
    int resourceId = res.getIdentifier("config_showNavigationBar", "bool", "android");
    if (resourceId != 0) {
        boolean hasNav = res.getBoolean(resourceId);
        // check override flag
        String sNavBarOverride = getNavBarOverride();
        if ("1".equals(sNavBarOverride)) {
            hasNav = false;
        } else if ("0".equals(sNavBarOverride)) {
            hasNav = true;
        }
        return hasNav;
    } else { // fallback
        return !ViewConfiguration.get(context).hasPermanentMenuKey();
    }
}
/**
 * 是否显示虚拟键盘
 */
public boolean isNavigationBarShow(){
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
        Display display = getWindowManager().getDefaultDisplay();
        Point size = new Point();
        Point realSize = new Point();
        display.getSize(size);
        display.getRealSize(realSize);
        boolean  result  = realSize.y!=size.y;
        return realSize.y!=size.y;
    }else {
        boolean menu = ViewConfiguration.get(this).hasPermanentMenuKey();
        boolean back = KeyCharacterMap.deviceHasKey(KeyEvent.KEYCODE_BACK);
        if(menu || back) {
            return false;
        }else {
            return true;
        }
    }
}

/**
 * 判断虚拟按键栏是否重写
 */
private static String getNavBarOverride() {
    String sNavBarOverride = null;
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
        try {
            Class c = Class.forName("android.os.SystemProperties");
            Method m = c.getDeclaredMethod("get", String.class);
            m.setAccessible(true);
            sNavBarOverride = (String) m.invoke(null, "qemu.hw.mainkeys");
        } catch (Throwable e) {
        }
    }
    return sNavBarOverride;
}