Sqlite数据库android中Spinner setselection（position）中的问题

Question

Hello friend i want to set selection() in spinner as per SQlite databse id so my cod eis as below

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 Function

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; 
}

When i run above code it retruns id always 0 any idea how can i solve it?

Answer 1

Your adapter contains ParserCategory objects, and you are comparing them to String parameter, which is always false. You probably want something like this (assuming the element should match the CatName field):

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

Another solution is overriding equals() and hashCode() in ParserCategory class.