Spinner控件的列表項(xiàng)點(diǎn)擊高亮效果

要實(shí)現(xiàn)Spinner控件的列表項(xiàng)點(diǎn)擊高亮效果，可以通過自定義Spinner的Adapter來實(shí)現(xiàn)。首先創(chuàng)建一個自定義的Adapter類繼承自ArrayAdapter，重寫getView方法，在getView方法中設(shè)置點(diǎn)擊高亮效果。

示例代碼如下所示：

public class CustomSpinnerAdapter extends ArrayAdapter<String> {
    private Context mContext;
    private int mSelectedItem = -1;

    public CustomSpinnerAdapter(Context context, List<String> items) {
        super(context, android.R.layout.simple_spinner_item, items);
        mContext = context;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View view = super.getView(position, convertView, parent);

        if (position == mSelectedItem) {
            view.setBackgroundColor(ContextCompat.getColor(mContext, R.color.highlight_color));
        } else {
            view.setBackgroundColor(Color.TRANSPARENT);
        }

        return view;
    }

    @Override
    public View getDropDownView(int position, View convertView, ViewGroup parent) {
        View view = super.getDropDownView(position, convertView, parent);

        if (position == mSelectedItem) {
            view.setBackgroundColor(ContextCompat.getColor(mContext, R.color.highlight_color));
        } else {
            view.setBackgroundColor(Color.TRANSPARENT);
        }

        return view;
    }

    public void setSelectedItem(int position) {
        mSelectedItem = position;
        notifyDataSetChanged();
    }
}

然后在Activity中使用這個自定義的Adapter來設(shè)置Spinner的數(shù)據(jù)源，并設(shè)置點(diǎn)擊監(jiān)聽事件來更新選中的項(xiàng)：

// 設(shè)置Spinner的數(shù)據(jù)源
List<String> items = new ArrayList<>();
items.add("Item 1");
items.add("Item 2");
items.add("Item 3");

CustomSpinnerAdapter adapter = new CustomSpinnerAdapter(this, items);
spinner.setAdapter(adapter);

// 設(shè)置Spinner的點(diǎn)擊監(jiān)聽事件
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
        adapter.setSelectedItem(position);
    }

    @Override
    public void onNothingSelected(AdapterView<?> parent) {
    }
});

這樣就可以實(shí)現(xiàn)Spinner控件的列表項(xiàng)點(diǎn)擊高亮效果了。在自定義的Adapter中重寫getView和getDropDownView方法來設(shè)置點(diǎn)擊高亮效果，并在Activity中設(shè)置點(diǎn)擊監(jiān)聽事件來更新選中的項(xiàng)。