从SQLite数据库创建listview

Question

我正在尝试从我的SQLite数据库填充listview ...这是我从数据库获取数据的方式:

    Cursor c = database.rawQuery("SELECT * FROM " + TableName, null);
    int Column1 = c.getColumnIndex("uri");
    int Column2 = c.getColumnIndex("file");
    int Column3 = c.getColumnIndex("id");
    c.moveToFirst();
    if (c != null) {
        do {
            String uri = c.getString(Column1);
            String file = c.getString(Column2);
            int id = c.getInt(Column3);
        } while (c.moveToNext());
    }

我通常会向listview添加一个数组:

    ListView my_listview2 = (ListView) findViewById(R.id.listView1);
    String my_array[] = {"Android", "iPhone"};
    my_listview2.setAdapter(new ArrayAdapter<String>(this, R.layout.row, R.id.my_custom_row, my_array));

如何从我的SQL查询中创建一个数组来setadapter？

Answer 1

执行此操作的最佳方法是使用CursorAdapter或SimpleCursorAdapter.这将为您提供最佳性能,一旦您弄明白,您会发现使用SQLite数据库时这是最简单的方法.

http://developer.android.com/reference/android/widget/SimpleCursorAdapter.html

下面是我经常使用的简单CustomCursorAdapter.只需将CustomCursorAdapter类添加为内部类.

    protected class CustomCursorAdapter extends SimpleCursorAdapter  {
        private int layout; 
        private LayoutInflater inflater;
        private Context context;

        public CustomCursorAdapter (Context context, int layout, Cursor c, String[] from, int[] to) {
            super(context, layout, c, from, to);
            this.layout = layout;
            this.context = context;
            inflater = LayoutInflater.from(context);

        }


        @Override
        public View newView(Context context, Cursor cursor, ViewGroup parent) {
            Log.i("NewView", newViewCount.toString());

            View v = inflater.inflate(R.layout.list_cell, parent, false);

            return v;
        }

        @Override
        public void bindView(View v, Context context, Cursor c) {
                    //1 is the column where you're getting your data from
            String name = c.getString(1);
            /**
             * Next set the name of the entry.
             */
            TextView name_text = (TextView) v.findViewById(R.id.textView);
            if (name_text != null) {
                name_text.setText(name);
            }   
        }

像这样创建一个CustomCursorAdapter的实例......你需要像你现在一样创建光标.

protected String[] from;
protected int[] to;

    //From is the column name in your cursor where you're getting the data
    //to is the id of the view it will map to
    from = new String[]{"name"};
    to = new int[]{R.id.textView};

CustomCursorAdapter adapter = new CustomCursorAdapter(this, R.layout.list, cursor, from, to);
listView.setAdapter(adapter);