Android spinner能實(shí)現(xiàn)自動(dòng)過(guò)濾重復(fù)項(xiàng)嗎

小樊
81
2024-10-14 22:00:15

是的，Android的Spinner可以實(shí)現(xiàn)自動(dòng)過(guò)濾重復(fù)項(xiàng)。你可以通過(guò)自定義一個(gè)適配器來(lái)實(shí)現(xiàn)這個(gè)功能。以下是一個(gè)簡(jiǎn)單的示例：

  1. 首先，創(chuàng)建一個(gè)自定義的適配器，繼承自BaseAdapter：
public class CustomSpinnerAdapter extends BaseAdapter {
    private Context context;
    private List<String> data;
    private List<String> uniqueData;

    public CustomSpinnerAdapter(Context context, List<String> data) {
        this.context = context;
        this.data = data;
        this.uniqueData = removeDuplicates(data);
    }

    @Override
    public int getCount() {
        return uniqueData.size();
    }

    @Override
    public Object getItem(int position) {
        return uniqueData.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        if (convertView == null) {
            LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = inflater.inflate(android.R.layout.simple_spinner_item, parent, false);
        }

        TextView textView = convertView.findViewById(android.R.id.text1);
        textView.setText(uniqueData.get(position));

        return convertView;
    }

    private List<String> removeDuplicates(List<String> data) {
        List<String> uniqueList = new ArrayList<>();
        for (String item : data) {
            if (!uniqueList.contains(item)) {
                uniqueList.add(item);
            }
        }
        return uniqueList;
    }
}
  1. 在你的Activity或Fragment中，使用這個(gè)自定義適配器為Spinner設(shè)置數(shù)據(jù)：
List<String> data = new ArrayList<>();
data.add("Item 1");
data.add("Item 2");
data.add("Item 1");
data.add("Item 3");
data.add("Item 2");

CustomSpinnerAdapter adapter = new CustomSpinnerAdapter(this, data);
Spinner spinner = findViewById(R.id.spinner);
spinner.setAdapter(adapter);

這樣，Spinner就會(huì)自動(dòng)過(guò)濾掉重復(fù)項(xiàng)，只顯示唯一的選項(xiàng)。

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