想全面了解解决方案不妨看下这两篇文章：
https://blog.csdn.net/smileiam/article/details/69055963
https://blog.csdn.net/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 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 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FrameLayout
FrameLayout content = (FrameLayout) activity.findViewById(android.R.id.content);
//2､获取到setContentView放进去的View
mChildOfContent = 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;
else
frameLayoutParams.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;
else
return 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;
}
}