simpleCursorAdapter刷新

利用simpleCursorAdapter绑定数据库，若数据库发生了改变，需要重新设置simpleCursorAdapter：

String[] from = { "_id", "name", "num" };
int[] to = { R.id.textView1, R.id.textView2, R.id.textView3 };

SimpleCursorAdapter adapter = new SimpleCursorAdapter(
this, R.layout.list_item, c, from, to);
this.listView.setAdapter(adapter);

或者采用

this.c.requery();
this.adapter.notifyDataSetChanged();

重新查询数据库，调用notifyDataSetChanged刷新view