在Android中,Spinner可以通過使用適配器(Adapter)來實現(xiàn)動態(tài)更新。以下是實現(xiàn)動態(tài)更新的步驟:
DynamicSpinnerAdapter
的類:public class DynamicSpinnerAdapter extends ArrayAdapter<String> {
private Context context;
private List<String> dataList;
public DynamicSpinnerAdapter(@NonNull Context context, int resource, @NonNull List<String> objects) {
super(context, resource, objects);
this.context = context;
this.dataList = objects;
}
// 其他重寫的方法,例如getCount(), getItem(), getItemId()等
}
Spinner spinner = findViewById(R.id.spinner);
List<String> dataList = new ArrayList<>();
// 添加數(shù)據(jù)到dataList中
DynamicSpinnerAdapter adapter = new DynamicSpinnerAdapter(this, android.R.layout.simple_spinner_item, dataList);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);
notifyDataSetChanged()
方法來刷新數(shù)據(jù):// 添加新數(shù)據(jù)到dataList中
dataList.add("新數(shù)據(jù)");
// 刷新適配器
adapter.notifyDataSetChanged();
public class DynamicSpinnerAdapter extends ArrayAdapter<String> {
// ...
public void filterData(List<String> filteredDataList) {
this.dataList = filteredDataList;
notifyDataSetChanged();
}
}
// 在Activity或Fragment中調(diào)用filterData方法
List<String> filteredDataList = new ArrayList<>();
// 根據(jù)條件篩選數(shù)據(jù)并添加到filteredDataList中
DynamicSpinnerAdapter adapter = (DynamicSpinnerAdapter) spinner.getAdapter();
adapter.filterData(filteredDataList);
通過以上步驟,你可以在Android中實現(xiàn)Spinner的動態(tài)更新。