Question

我有两个通过密钥连接的数据库：

Questions
-------------------
_id    text
1      Question 1
2      Questions 2

Answers
-------------------
_id    text    answered     question_id
1      Yes     200          1
2      No      100          1
3      Yes     30           2
4      No      260          2

我可以使用SimpleCursorAdapter完美地调用数据。但是，我想将所有问题和答案放在列表视图中，其中一个列表项看起来像这样：

Question 1
Yes: 200
No: 100
____________

Question 2
Yes: 30
No: 260
____________

我该怎么做？我所做的最好的是：

Question 1
Yes: 200
____________

Question 1
No: 100
____________

Question 2
Yes: 30
____________

Question 2
No: 230

知道怎么做吗？我是否需要两个游标（一个用于遍历问题db，然后另一个用第一个游标中的question_id循环回答）或者我可以用一个游标实现这个吗？我还考虑过使用TableLayout进行操作，但未能正确插入行。

我希望有人能给我一些建议。

Answer 1

您可以参考此代码，

public class CustomAdapter extends BaseAdapter {

        private Context mContext;
        private Cursor mCursor;

        // State of the row that needs to show separator
        private static final int SECTIONED_STATE = 1;
        // State of the row that need not show separator
        private static final int REGULAR_STATE = 2;
        // Cache row states based on positions
        private int[] mRowStates;

        public CustomAdapter(Context context, Cursor cursor) {
            mContext = context;
            mCursor = cursor;
            mRowStates = new int[getCount()];
        }

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

        @Override
        public Object getItem(int position) {
            return null;
        }

        @Override
        public long getItemId(int position) {
            return 0;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {

            View view;
            boolean showSeparator = false;

            mCursor.moveToPosition(position);

            if (convertView == null) {
                LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                view = inflater.inflate(R.layout.contact_item, null);
            }
            else {
                view = convertView;
            }

            // Set contact name and number
            TextView contactNameView = (TextView) view.findViewById(R.id.contact_name);
            TextView phoneNumberView = (TextView) view.findViewById(R.id.phone_number);

            String name = mCursor.getString( mCursor.getColumnIndex(mProjection[0]) );
            String number = mCursor.getString( mCursor.getColumnIndex(mProjection[1]) );

            contactNameView.setText( name );
            phoneNumberView.setText( number );


            // Show separator ?

            switch (mRowStates[position]) {

                case SECTIONED_STATE:
                    showSeparator = true;
                    break;

                case REGULAR_STATE:
                    showSeparator = false;
                    break;

                default:

                    if (position == 0) {
                        showSeparator = true;
                    }
                    else {
                        mCursor.moveToPosition(position - 1);

                        String previousName = mCursor.getString(mCursor.getColumnIndex(mProjection[0]));
                        char[] previousNameArray = previousName.toCharArray();
                        char[] nameArray = name.toCharArray();

                        if (nameArray[0] != previousNameArray[0]) {
                            showSeparator = true;
                        }

                        mCursor.moveToPosition(position);
                    }

                    // Cache it
                    mRowStates[position] = showSeparator ? SECTIONED_STATE : REGULAR_STATE;

                    break;
            }

            TextView separatorView = (TextView) view.findViewById(R.id.separator);

            if (showSeparator) {
                separatorView.setText(name.toCharArray(), 0, 1);
                separatorView.setVisibility(View.VISIBLE);
            }
            else {
                view.findViewById(R.id.separator).setVisibility(View.GONE);
            }

            return view;
        }
    }

android在一个列表项中有多行来自游标

1 个答案: