想全面了解解决方案不妨看下这两篇文章：
/smileiam/article/details/69055963
/weixin_38775077/article/details/80980862
解决问题：
1.解决底部按钮或输入框被虚拟导航键遮挡，
2.解决虚拟按键与软键盘冲突
判断是否存在虚拟按键的方法，
一是通过"qemu.hw.mainkeys"判断，=1表示存在虚拟按键，=0表示不存在虚拟按键，该判断适用于虚拟按键中有收起按钮上滑展开的虚拟按键
二是通过获取屏幕真实宽高-可用宽高>0来判断是不是有固定的虚拟按键
public class AndroidBug5497Workaround {private final Activity activity;// For more information, see /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 int statusBarHeight;//状态栏高度private AndroidBug5497Workaround(final Activity activity) {this.activity = activity;if (checkDeviceHasNavigationBar(activity)) {//获取状态栏的高度int resourceId = activity.getResources().getIdentifier("status_bar_height", "dimen", "android");statusBarHeight = activity.getResources().getDimensionPixelSize(resourceId);}//1､找到Activity的最外层布局控件，它其实是一个DecorView,它所用的控件就是FrameLayoutFrameLayout content = (FrameLayout) activity.findViewById(android.R.id.content);//2､获取到setContentView放进去的ViewmChildOfContent = content.getChildAt(0);//3､给Activity的xml布局设置View树监听，当布局有变化，如键盘弹出或收起时，都会回调此监听mChildOfContent.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {//4､软键盘弹起会使GlobalLayout发生变化public void onGlobalLayout() {//5､当前布局发生变化时，对Activity的xml布局进行重绘possiblyResizeChildOfContent(checkDeviceHasNavigationBar(activity));}});//6､获取到Activity的xml布局的放置参数frameLayoutParams = (FrameLayout.LayoutParams)mChildOfContent.getLayoutParams();}/*** 重新调整布局高度* 获取界面可用高度，如果软键盘弹起后，Activity的xml布局可用高度需要减去键盘高度** @param hasNav*/private void possiblyResizeChildOfContent(boolean hasNav) {//1､获取当前界面可用高度，键盘弹起后，当前界面可用布局会减少键盘的高度int usableHeightNow = computeUsableHeight(hasNav);//2､如果当前可用高度和原始值不一样if (usableHeightNow != usableHeightPrevious) {//3､获取Activity中xml中布局在当前界面显示的高度int usableHeightSansKeyboard;if (hasNav)usableHeightSansKeyboard = mChildOfContent.getHeight();//兼容华为等机型else {usableHeightSansKeyboard = mChildOfContent.getRootView().getHeight();//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 (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {Rect frame = new Rect();activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);int statusBarHeight = frame.top;usableHeightSansKeyboard -= statusBarHeight;}}//4､Activity中xml布局的高度-当前可用高度int heightDifference = usableHeightSansKeyboard - usableHeightNow;//5､高度差大于屏幕1/4时，说明键盘弹出if (heightDifference > (usableHeightSansKeyboard / 4)) {// keyboard probably just became visible// 6､键盘弹出了，Activity的xml布局高度应当减去键盘高度if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT && hasNav) {frameLayoutParams.height = usableHeightSansKeyboard - heightDifference + statusBarHeight;} else {frameLayoutParams.height = usableHeightSansKeyboard - heightDifference;}} else {if (hasNav)frameLayoutParams.height = usableHeightNow + statusBarHeight;elseframeLayoutParams.height = usableHeightSansKeyboard;}//7､ 重绘Activity的xml布局mChildOfContent.requestLayout();usableHeightPrevious = usableHeightNow;}}/*** 计算mChildOfContent可见高度 ** @return*/private int computeUsableHeight(boolean hasNav) {if (hasNav) {Rect r = new Rect();mChildOfContent.getWindowVisibleDisplayFrame(r);// 全屏模式下：直接返回r.bottom，r.top其实是状态栏的高度if (r.top < statusBarHeight)return r.bottom - statusBarHeight;elsereturn r.bottom - r.top;} else {Rect frame = new Rect();activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);int statusBarHeight = frame.top;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 (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {return (r.bottom - r.top) + statusBarHeight;}return (r.bottom - r.top);}}/*** 通过"qemu.hw.mainkeys"判断是否存在NavigationBar** @return 是否有NavigationBar*/private static boolean checkDeviceHasNavigationBar(Activity activity) {boolean hasNavigationBar = false;Resources rs = activity.getResources();int id = rs.getIdentifier("config_showNavigationBar", "bool", "android");if (id > 0) {hasNavigationBar = rs.getBoolean(id);}try {Class systemPropertiesClass = Class.forName("android.os.SystemProperties");Method m = systemPropertiesClass.getMethod("get", String.class);String navBarOverride = (String) m.invoke(systemPropertiesClass, "qemu.hw.mainkeys");if ("1".equals(navBarOverride)) {hasNavigationBar = false;} else if ("0".equals(navBarOverride)) {hasNavigationBar = true;} else {hasNavigationBar = hasNavBar(activity);}} catch (Exception e) {}return hasNavigationBar;}/*** 根据屏幕真实宽高-可用宽高>0来判断是否存在NavigationBar** @param activity 上下文* @return 是否有NavigationBar*/private static boolean hasNavBar(Activity activity) {WindowManager windowManager = activity.getWindowManager();Display d = windowManager.getDefaultDisplay();DisplayMetrics realDisplayMetrics = new DisplayMetrics();if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {d.getRealMetrics(realDisplayMetrics);}int realHeight = realDisplayMetrics.heightPixels;int realWidth = realDisplayMetrics.widthPixels;DisplayMetrics displayMetrics = new DisplayMetrics();d.getMetrics(displayMetrics);int displayHeight = displayMetrics.heightPixels;int displayWidth = displayMetrics.widthPixels;return (realWidth - displayWidth) > 0 || (realHeight - displayHeight) > 0;}}
