Question

我在数据库中有一个列_id我希望在单击列表视图项时获得此ID。目前，以下代码为我提供了项目的position。我＆＃39;我还在玩弄它我感觉方法有问题＆＃39; getItemId＆＃39;

onCreate方法

        ArrayList<String> arrayCatNames = new ArrayList<String>();
        String query = "SELECT * FROM category ORDER BY name ASC";
        Cursor results = myDB.rawQuery(query, null);
        while(results.moveToNext()){
            String catName = results.getString(results.getColumnIndex("name"));
            arrayCatNames.add(catName);
        }
        String[] catNamesArr = new String[arrayCatNames.size()];
        catNamesArr = arrayCatNames.toArray(catNamesArr);
        lvActivityCategory = (ListView) findViewById(R.id.lvActivityCategory);
        lvActivityCategory.setAdapter(new categoryCursorAdaptor(this, catNamesArr));
        lvActivityCategory.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Intent intent = new Intent(getApplicationContext(), categoryActivity.class);
                intent.putExtra("category_id", id);

                Context context = getApplicationContext();
                String s = Long.toString(position);
                CharSequence text = s;
                int duration = Toast.LENGTH_SHORT;

                Toast toast = Toast.makeText(context, text, duration);
                toast.show();
            }
        });

categoryCursorAdaptor

class categoryCursorAdaptor extends BaseAdapter {

    Context context;
    String[] data;
    private static LayoutInflater inflater = null;

    public categoryCursorAdaptor(Context context, String[] data) {
        this.context = context;
        this.data = data;
        inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

    @Override
    public int getCount() {
        return data.length;
    }

    @Override
    public Object getItem(int position) {
        return data[position];
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View vi = convertView;
        if (vi == null) vi = inflater.inflate(R.layout.item_category, null);
        TextView text = (TextView) vi.findViewById(R.id.itemListCategory);
        text.setText(data[position]);
        return vi;
    }
}

Answer 1

ArrayList<String> arrayCatNames = new ArrayList<String>();
ArrayList<Integer> arrayIds = new ArrayList<Integer>();
String query = "SELECT * FROM category ORDER BY name ASC";
Cursor results = myDB.rawQuery(query, null);
while(results.moveToNext()){
            String catName = results.getString(results.getColumnIndex("name"));
            int Ids = results.getInt(results.getColumnIndex("_id"));
            arrayCatNames.add(catName);
            arrayIds.add(Ids);
}

然后在你的onItemClick

中

yourCategoryId = arrayIds.get(position);

您需要在onCreate

之前在顶部声明ArrayList arrayIds

单击项目时从列表视图中获取ID

1 个答案: