如何使用SparseArray作为适配器的源? [英] How to use SparseArray as a source for Adapter?
问题描述
我有一个要在Spinner中填充的值的稀疏数组,选择该项目后,我想获取id(这是稀疏数组的键).
I have a sparse array of values which I want to populate in a Spinner, and when the item is selected, I want to get the id (which is the key from the sparse array).
从SparseArray创建适配器的首选方法是什么?
What is the preferred way of creating an adapter from a SparseArray?
是否可以继承现有适配器(如BaseAdapter或ListAdapter)的子类,以便使这些项具有SparseArray中的项作为项ID?
Is it possible to subclass an existing Adapter like BaseAdapter or ListAdapter So that the items will have a key from the SparseArray as item id?
我不知道如何实现上述目标,我正在考虑创建一个简单的ArrayAdapter实例,并从SparseArray中为其提供值作为源,并在选择该项目时通过该值查找键,我认为这是成功的效率不高.
Not knowing how to achieve the above, I am thinking of creating a simple ArrayAdapter instance and giving it values from the SparseArray as a source and when the item is selected, to look up the key by the value, which I think won't be efficient.
推荐答案
创建BaseAdapter
的子类应该可以正常工作.例如.拿
Creating a subclass of BaseAdapter
should work fine. E.g. take
public abstract class SparseArrayAdapter<E> extends BaseAdapter {
private SparseArray<E> mData;
public void setData(SparseArray<E> data) {
mData = data;
}
@Override
public int getCount() {
return mData.size();
}
@Override
public E getItem(int position) {
return mData.valueAt(position);
}
@Override
public long getItemId(int position) {
return mData.keyAt(position);
}
}
并扩展该功能以获得一些实际功能.例如
and extend that one to get some actual functionality. For example like
public class SparseStringsAdapter extends SparseArrayAdapter<String> {
private final LayoutInflater mInflater;
public SparseStringsAdapter(Context context, SparseArray<String> data) {
mInflater = LayoutInflater.from(context);
setData(data);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
TextView result = (TextView) convertView;
if (result == null) {
result = (TextView) mInflater.inflate(android.R.layout.simple_list_item_1, null);
}
result.setText(getItem(position));
return result;
}
}
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