Question

我有一个带自定义适配器的ListView，我使用Vector创建TextView 我只想显示包含字母“a”的国家/地区。我无法找到解决方案。

这是我的适配器以及我是如何尝试的

public class CountryAdapter extends BaseAdapter {
protected MainActivity main = new MainActivity();
private Context mContext;
protected Vector<Country> mVector;
protected SQLiteDatabase mDb;
Cursor cursor;
ImageView deleteIt;
View rowView;
public int pos;


public void setmContext(Context mContext) {
    this.mContext = mContext;
}

public CountryAdapter(Context mContext) {
    this.mContext = mContext;

    mVector = new Vector<Country>();

    CountryOpenHelper helper = new CountryOpenHelper(mContext);
    mDb = helper.getWritableDatabase();

    cursor = mDb.rawQuery("SELECT * FROM COUNTRIES", null);

    if (cursor.getCount() > 0) {

        cursor.moveToFirst();
    }
    do {
        Country country = new Country();
        country.setmCountryIndex(cursor.getInt(0));

        country.setmCountryName(cursor.getString(2));
        country.setmCountryTextSize(cursor.getInt(1));
        country.setmCountryColor(cursor.getInt(3));
        mVector.add(country);
        for (int i = 0; i < cursor.getCount(); i++){
            if (mVector.get(i).toString().contains("a") == false){
                mVector.remove(i);
            }
        }

    } while (cursor.moveToNext());

如果需要，我的CountryAdapter中的GetView方法也是如此：

public View getView(int position, View convertView, ViewGroup parent) {
    TextView tv;
    if(convertView == null){
        tv = new TextView(mContext);
    }else{
        tv = (TextView) convertView;
    }

    this.pos = position;

    tv.setText(mVector.get(position).getmCountryName());
    tv.setTextColor(mVector.get(position).getmCountryColor());
    tv.setTextSize(mVector.get(position).getmCountryTextSize());

    return tv;




}

Answer 1

我建议稍微更改路线：使用内置SimpleCursorAdapter或自定义CursorAdapter。 Cursors和CursorAdapters比将Cursor转换为Vector或任何其他类型的List更有效率和弹性。他们还提供对FilterQueryProvider类的访问权限，该类将为您筛选Cursor。

试试这个basic tutorial。

显示ListView中包含特定字母的视图

1 个答案: