android Adapter筆記

14.03.04

數據庫適配器

遊標適配器cursorAdapter

Newview：創建行佈局對象

Bindview：更新數據

Id默認必須爲_id

private void show() {
        Cursor cursor = mDb.query("students", null, null, null, null, null, null);
        String[] from=new String[]{"name","phone"};
        int[] to=new int[]{R.id.textView1,R.id.textView2};
        SimpleCursorAdapter adapter = new SimpleCursorAdapter(this, R.layout.item_list, cursor, from, to);
        listview.setAdapter(adapter);
}

若任然報錯，將數據庫表刪除

適配器聲明爲成員變量，則添加數據後無顯示

添加顯示：

   重新遍歷遊標

private void show() {
        Cursor cursor = mDb.query("students", null, null, null, null, null, null);
        String[] from=new String[]{"name","phone"};
        int[] to=new int[]{R.id.textView1,R.id.textView2};
        SimpleCursorAdapter adapter = new SimpleCursorAdapter(this, R.layout.item_list, cursor, from, to);
        listview.setAdapter(adapter);
}

simpleCursorAdapter:簡單遊標適配器

顯示

優：代碼結構簡單

缺：支持的控件有限

textview、imageview、radiobutton、checkbox（CompoundButton）

private void show() {
        Cursor cursor = mDb.query("students", null, null, null, null, null, null);
        String[] from=new String[]{"name","phone"};
        int[] to=new int[]{R.id.textView1,R.id.textView2};
        SimpleCursorAdapter adapter = new SimpleCursorAdapter(this, R.layout.item_list, cursor, from, to);
        listview.setAdapter(adapter);
}