android webview监听软键盘弹出和隐藏来修改虚拟导航栏颜色

最近项目中用到了webview，然后里面有输入框，当我们点击输入框的时候，软键盘挡住了布局，这就尴尬了，并且产品说，只有在软键盘弹出的时候底部的虚拟导航栏为黑色，软键盘隐藏的时候虚拟导航栏应该也隐藏。网上搜了很多资料和博客，最终把几篇有价值的贴上，并且附上源码。

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 View                     mChildOfContent;private int                         usableHeightPrevious;private FrameLayout.LayoutParams   frameLayoutParams;private AndroidBug5497Workaround(final Activity activity) {FrameLayout content = 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(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 visibleframeLayoutParams.height = usableHeightSansKeyboard - heightDifference;PhoneUtils.setBottomNavigationColor(activity);} else {// keyboard probably just became hiddenframeLayoutParams.height = usableHeightSansKeyboard;PhoneUtils.hideVirtualNavigation(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 class PhoneUtils {/**** 显示底部虚拟按键的颜色* * @param activity*/public static void setBottomNavigationColor(Activity activity) {if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {Window window = activity.getWindow();window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS | WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);window.getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_LAYOUT_STABLE);window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);window.setNavigationBarColor(Color.BLACK);}}/**** 隐藏虚拟按键* * @param activity*/public static void hideVirtualNavigation(Activity activity) {if (hasNavBar(activity.getApplicationContext())) {hideBottomUIMenu(activity);}}/*** 隐藏虚拟按键，并且全屏*/private static void hideBottomUIMenu(Activity activity) {// 隐藏虚拟按键，并且全屏if (Build.VERSION.SDK_INT > 11 && Build.VERSION.SDK_INT < 19) { // lower apiView v = activity.getWindow().getDecorView();v.setSystemUiVisibility(View.GONE);} else if (Build.VERSION.SDK_INT >= 19) {// for new api versions.View decorView = activity.getWindow().getDecorView();int uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY | View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_IMMERSIVE;decorView.setSystemUiVisibility(uiOptions);activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);}}/*** 检查是否存在虚拟按键栏** @param context* @return*/private 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 flagString sNavBarOverride = getNavBarOverride();if ("1".equals(sNavBarOverride)) {hasNav = false;} else if ("0".equals(sNavBarOverride)) {hasNav = true;}return hasNav;} else { // fallbackreturn !ViewConfiguration.get(context).hasPermanentMenuKey();}}/*** 判断虚拟按键栏是否重写** @return*/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;}
}

thanks
webview 软键盘挡住问题
虚拟按键修改颜色
隐藏虚拟按键

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