Question

我试图在我的底部菜单上获得4个项目，但第4个项目不是动画，如果我切换到完全不同的菜单格式，我认为此菜单类型将支持3-5个项目。 / p>

public static void main(String[] args) {
    boolean loop = true;
    while (loop == true){
        commands();
        System.out.println("Please enter what you would like to do: (+,-,*,/,%)");
        String function = input.nextLine();
        System.out.println("Enter the first number to be calucalted (If dividing, this is the numerator):");
        double n1 = input.nextDouble();
        input.nextLine();
        System.out.println("Enter the second number to be calucalted (If dividing, this is the denominator):");
        double n2 = input.nextDouble();
        input.nextLine();

        //=======================
        // Addition
        //=======================
        if (function.equals("+")){
            double sum = n1+n2;
            System.out.println(n1+"+"+ n2 +" = " + sum);
            System.out.println("e = end | c = clear | m = save | r = recall");
            String command = input.nextLine();
            switch (command){
            case "e":
                end();
                break;
            case "c":
                clear();
                break;
            case "m":
                save(sum);
                break;
            case "r":
                recall();
                break;
            }

        }

主要活动代码

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:android="http://schemas.android.com/apk/res/android">

<item
    android:id="@+id/navigation_home"
    android:icon="@mipmap/news_icon"
    android:title="@string/title_news" />

<item
    android:id="@+id/navigation_dashboard"
    android:icon="@drawable/ic_dashboard_black_24dp"
    android:title="@string/title_schedule" />

<item
    android:id="@+id/navigation_notifications"
    android:icon="@drawable/ic_notifications_black_24dp"
    android:title="@string/title_team" />
<item
    android:id="@+id/login"
    android:icon="@drawable/ic_notifications_black_24dp"
    android:title="@string/title_team" />

</menu>

Answer 1

我犯了一个愚蠢的错误，结果我在onNavigationItemSelected函数中没有为switch语句返回true。

Android底部导航菜单有4个项目

1 个答案: