在autocompletetextview中获取SQLite数据的步骤如下:
下面是一个示例代码:
public class MyAdapter extends BaseAdapter implements Filterable {
private List<String> mData; // 存储从数据库中获取的数据
private Context mContext;
public MyAdapter(Context context) {
mContext = context;
mData = new ArrayList<>();
}
@Override
public int getCount() {
return mData.size();
}
@Override
public Object getItem(int position) {
return mData.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = LayoutInflater.from(mContext).inflate(R.layout.item_layout, parent, false);
holder = new ViewHolder();
holder.textView = convertView.findViewById(R.id.text_view);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.textView.setText(mData.get(position));
return convertView;
}
@Override
public Filter getFilter() {
Filter filter = new Filter() {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults results = new FilterResults();
List<String> filteredData = new ArrayList<>();
// 从数据库中查询与用户输入匹配的数据
SQLiteDatabase db = SQLiteDatabase.openDatabase("your_database_path", null, SQLiteDatabase.OPEN_READONLY);
Cursor cursor = db.rawQuery("SELECT * FROM your_table WHERE column_name LIKE ?", new String[]{constraint + "%"});
if (cursor != null && cursor.moveToFirst()) {
do {
String data = cursor.getString(cursor.getColumnIndex("column_name"));
filteredData.add(data);
} while (cursor.moveToNext());
cursor.close();
}
results.values = filteredData;
results.count = filteredData.size();
return results;
}
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
if (results != null && results.count > 0) {
mData = (List<String>) results.values;
notifyDataSetChanged();
} else {
notifyDataSetInvalidated();
}
}
};
return filter;
}
private static class ViewHolder {
TextView textView;
}
}
在你的Activity或Fragment中,使用以下代码设置AutocompleteTextView的适配器:
AutocompleteTextView autoCompleteTextView = findViewById(R.id.autocomplete_text_view);
MyAdapter adapter = new MyAdapter(this);
autoCompleteTextView.setAdapter(adapter);
请注意,上述示例代码仅为演示目的,实际使用时需要根据你的数据库结构和需求进行适当修改。
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