还是那个倒霉的双十一需求，测试时发现发弹幕的输入框被系统输入法挡住了，这个问题在之前UC内核的浏览器时没问题啊。经过各种对比定位，发现是因为这次需求还有个沉浸式的实现，就是这个实现导致输入框无法被弹起。所幸看到了AndroidBug5497Workaround (用我这个就够了)这篇blog，试验后效果拔群，唯独有个小遗憾是没有适配非沉浸式的状态，沉浸式和非沉浸式切换时会有个小黑条。小子不才遂在大神肩膀上狗尾续貂，以资来者。

原理

网传这是个Android固有的bug，具体原理我也没搞明白了，秉着又不是不能用的原则，先把问题解决了。

这个实现主要就是在键盘出现和消失的时候计算键盘、状态栏以及导航栏的高度，以便确定页面太高的大小。我的小调整就是增加一个沉浸式状态的传递，如果是沉浸式则需要少减一个状态栏的高度，仅此而已。

实现

Java代码

public class AndroidBug5497Workaround {// For more information, see https://issuetracker.google.com/issues/36911528// To use this class, simply invoke assistActivity() on an Activity that already has its// content view set.public static void assistActivity(Activity activity, boolean isImmersive) {new AndroidBug5497Workaround(activity, isImmersive);}private View mChildOfContent;private int usableHeightPrevious;private FrameLayout.LayoutParams frameLayoutParams;private boolean isImmersive;private AndroidBug5497Workaround(Activity activity, boolean isImmersive) {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();this.isImmersive = isImmersive;}private int frameLayoutHeight = 0;private void possiblyResizeChildOfContent() {int usableHeightNow = computeUsableHeight();if (usableHeightNow != usableHeightPrevious) {int usableHeightSansKeyboard = mChildOfContent.getRootView().getHeight();int heightDifference = usableHeightSansKeyboard - usableHeightNow;if (heightDifference > (usableHeightSansKeyboard / 4)) {// keyboard probably just became visibleframeLayoutHeight = frameLayoutParams.height;// ！！！修改前保存原有高度// 是否沉浸式，增减状态栏高度int statusBarHeight = isImmersive && BarUtil.isSupportFitsSystem() ?BarUtils.getStatusBarHeight() : 0;frameLayoutParams.height = usableHeightSansKeyboard - heightDifference + statusBarHeight;} else {// keyboard probably just became hiddenif (0 != frameLayoutHeight) {frameLayoutParams.height = frameLayoutHeight;// ！！！收起键盘恢复原有高度}}mChildOfContent.requestLayout();usableHeightPrevious = usableHeightNow;}}private int computeUsableHeight() {Rect r = new Rect();mChildOfContent.getWindowVisibleDisplayFrame(r);return (r.bottom - r.top);}
}

在初始化webview的onCreate()方法中增加一句即可

AndroidBug5497Workaround.assistActivity(this, isImmersive);

参考

AndroidBug5497Workaround (用我这个就够了)