Question

你好朋友我想根据SQlite数据库ID在微调器中设置selection（）所以我的鳕鱼eis如下

ArrayList<ParserCategory>mArrayListParserCategories = new ArrayList<ParserCategory>();
    mArrayListParserCategories = mDatabaseConnectionAPI.getCategoryData(mStrinGetTrMode);
    mSpinnerAdapterData = new SpinnerAdapterData(mArrayListParserCategories);
    mSpinnerCate.setAdapter(mSpinnerAdapterData);
    int id= mSpinnerCate.getIndexFromElement(mSpinnerAdapterData,mStringGetCantname);

DatabaseConnectionAPI.java

public ArrayList<ParserCategory> getCategoryData(String type) {

    ArrayList<ParserCategory> mGetCategoryList = new ArrayList<ParserCategory>();
    try {
        String sqlQuery = "SELECT * FROM Category_Master where cat_type like "+ "'"+type+"'";
        Cursor mCursorCategory = Query(sqlQuery);
        if (mCursorCategory != null) {
            mCursorCategory.moveToFirst();
            while (!mCursorCategory.isAfterLast()) {

                ParserCategory mParserCategory = new ParserCategory();
                mParserCategory
                .setCatId(mCursorCategory.getString(mCursorCategory
                        .getColumnIndex("cat_id")));
                mParserCategory
                .setCatName(mCursorCategory.getString(mCursorCategory
                        .getColumnIndex("cat_name")));
                mParserCategory
                .setCatType(mCursorCategory.getString(mCursorCategory
                        .getColumnIndex("cat_type")));
                mParserCategory
                .setCatMode(mCursorCategory.getString(mCursorCategory
                        .getColumnIndex("cat_mode")));
                mGetCategoryList.add(mParserCategory);
                mCursorCategory.moveToNext();
            }
        }
        mCursorCategory.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
    return mGetCategoryList;
}

SpinnerAdapterData.java

    public class SpinnerAdapterData extends ArrayAdapter<ParserCategory> {
    ArrayList<ParserCategory> mArrayList;
    LayoutInflater mInflater;
    Activity mActivity;

    public SpinnerAdapterData(ArrayList<ParserCategory> list) {
        super( IncomeUpdateActivity.this, R.layout.custom_spin_layout, list);
        this.mArrayList = list;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
         LayoutInflater inflator = getLayoutInflater();
         convertView = inflator.inflate(R.layout.custom_spin_layout, null);
        TextView mTextView = (TextView) convertView.findViewById(R.id.txt);
        mTextView.setText(mArrayList.get(position).getCatName());
        return convertView;
    }

}

getIndexFromElement函数

public int getIndexFromElement(ArrayAdapter<ParserCategory> adapter, String element) { 
      for(int  i = 0; i < adapter.getCount(); i++) { 
            if(adapter.getItem(i).equals(element)) { 

                  return i; 
            } 
      } 


      return 0; 
}

当我运行上面的代码时，它会重新设置id始终为0，我知道如何解决它？

Answer 1

您的适配器包含ParserCategory个对象，您将它们与String参数进行比较，该参数始终为false。你可能想要这样的东西（假设元素应该与CatName字段匹配）：

if (((ParserCategory)adapter.getItem(i)).getCatName().equals(element))

另一种解决方案是覆盖ParserCategory类中的equals()和hashCode()。

使用Sqlite Database android的Spinner setselection（position）中的问题

1 个答案: