java - Android中如何更新ListView？

Question

我想通过点击其元素来升级我的 ListView，并更新建筑物数量(以及 future 的价格)。现在，该列表仅在应用程序重新启动时更新。

创建时:

Building[] buildings = {
                new Building(1, getString(R.string.mouse), 15, iMouses),
                new Building(2, getString(R.string.grandma), 100, iGrandmas),
                new Building(3, getString(R.string.farm), 500, iFarms),
                new Building(4, getString(R.string.factory), 3000, iFactories),
                new Building(5, getString(R.string.mine), 10000, iMines)
        };

        ListView lstBuildings = (ListView)findViewById(R.id.lstBuildings);

        final ArrayAdapter<Building> adapter = new ArrayAdapter<>(this,
                android.R.layout.simple_list_item_1, buildings);

        lstBuildings.setAdapter(adapter);

        lstBuildings.setOnItemClickListener(new AdapterView.OnItemClickListener(){
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position,
                                    long id){
                if (id+1 == 1) { //         Mouse
                    if ((int) fCats >= 15) {
                        fIncome = fIncome + 0.1f;
                        fCats = fCats - 15;
                        iMouses = iMouses + 1;
                        iBuildings = iBuildings + 1;

                        adapter.notifyDataSetChanged();
                    }

我的建筑类别:

class Building {
    private final int id;
    private final String name;
    private final double price;
    private final int number;

    public Building(int id, String name, double price, int number) {
        super();
        this.id = id;
        this.name = name;
        this.price = price;
        this.number = number;
    }

    @Override
    public String toString() {
        return this.id + ". " + this.name + " [" + (int)this.price + "] (" + this.number + ")";
    }
}

感谢您的帮助，请给我一些优化代码的技巧。

Answer 1

解决方案非常简单:

adapter.notifyDataSetChanged()

看看这个:

if (id+1 == 1) { //         Mouse
                if ((int) fCats >= 15)
                    fIncome = fIncome + 0.1f;
                    fCats = fCats - 15;
                    iMouses = iMouses + 1;
                    iBuildings = iBuildings + 1;

                    adapter.notifyDataSetChanged();
                }

您根本没有更新适配器的数据，您只是设置一些变量