原因：使用安卓的BottomNavigationView控制元件開發底部導航欄同時使用了沉浸式狀態列導致華為手機的底部導航欄會蓋住我應用的導航欄。

解決：先寫一個工具類

import android.content.Context;
import android.content.res.Resources;
import android.graphics.Rect;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewTreeObserver;
 
import java.lang.reflect.Method;
 
public class NavigationBarUtil {
    public static void initActivity(View content) {
        new NavigationBarUtil(content);
    }
 
    private View mObserved;//被監聽的檢視
    private int usableHeightView;//檢視變化前的可用高度
    private ViewGroup.LayoutParams layoutParams;
 
    private NavigationBarUtil(View content) {
        mObserved = content;
        //給View新增全域性的佈局監聽器監聽檢視的變化
        mObserved.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            public void onGlobalLayout() {
                resetViewHeight();
            }
        });
        layoutParams = mObserved.getLayoutParams();
    }
 
    /**
     * 重置檢視的高度，使不被底部虛擬鍵遮擋
     */
    private void resetViewHeight() {
        int usableHeightViewNow = CalculateAvailableHeight();
        //比較佈局變化前後的View的可用高度
        if (usableHeightViewNow != usableHeightView) {
            //如果兩次高度不一致
            //將當前的View的可用高度設定成View的實際高度
            layoutParams.height = usableHeightViewNow;
            mObserved.requestLayout();//請求重新佈局
            usableHeightView = usableHeightViewNow;
        }
    }
 
    /**
     * 計算試圖高度
     * @return
     */
    private int CalculateAvailableHeight() {
        Rect r = new Rect();
        mObserved.getWindowVisibleDisplayFrame(r);
        return (r.bottom - r.top);//如果不是沉浸狀態列，需要減去頂部高度
//        return (r.bottom );//如果是沉浸狀態列
    }
 
    /**
     * 判斷底部是否有虛擬鍵
     * @param context
     * @return
     */
    public static boolean hasNavigationBar(Context context) {
        boolean hasNavigationBar = false;
        Resources rs = context.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;
            }
        } catch (Exception e) {
 
        }
        return hasNavigationBar;
 
    }
 
}
 

然後在activity的OnCreate方法中寫入下面的程式碼：

if(NavigationBarUtil.hasNavigationBar(this)){
            NavigationBarUtil.initActivity(findViewById(android.R.id.content));
        }