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我正在使用简单的光标适配器根据编辑文本中键入的文本过滤列表视图项。我做不到。代码没有错误。但过程即过滤不会发生。Listview 静止不动，没有任何变化。谁能帮我？

这是我的代码。>

SimpleCursorAdapter sca;
ListView lv;
EditText searchtext;
lv = (ListView) findViewById(R.id.listView1);
searchtext = (EditText) findViewById(R.id.eT_sth);

searchtext.addTextChangedListener(new TextWatcher() {

        @Override
        public void onTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {
            // TODO Auto-generated method stub
            sca.getFilter().filter(arg0);
        }

        @Override
        public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
                int arg3) {
            // TODO Auto-generated method stub

        }

        @Override
        public void afterTextChanged(Editable arg0) {
            // TODO Auto-generated method stub

        }
    });

    sca.setFilterQueryProvider(new FilterQueryProvider() {

        @Override
        public Cursor runQuery(CharSequence cse) {
            String pi=null;
            if(cse!=null)
                pi=cse.toString();
            return db.filteredItem(pi);
        }
    });

public Cursor filteredItem(String st) throws SQLException {
    Cursor mcursor = null;
    SQLiteDatabase db = this.getReadableDatabase();
    try {
        if (st == null || st.length() == 0) {
            String query = "SELECT * FROM" + this.TABLE_MIC2 + "";
            mcursor = db.rawQuery(query, null);
        } else {
            mcursor = db.query(this.TABLE_MIC2, new String[] { this.KEY_ID,
                    this.KEY_ITEMNUMBER, this.KEY_DESCRIPTION,
                    this.KEY_PICKINGSEQUENCE, this.KEY_QTYONHAND,
                    this.KEY_QTYCOUNTED, this.KEY_STOCKUNIT,
                    this.KEY_STATUS }, this.KEY_ITEMNUMBER + " like '%"
                    + st + "%'", null, null, null, null);
        }
        if (mcursor != null) {
            mcursor.moveToFirst();
        }
    } catch (Exception e) {
        e.printStackTrace();
    }

    return mcursor;

}

这是我的列表视图方法。

public void inserttolist(String SpnLocation) {
    try {
         cu = db.getdata(SpnLocation);
        String[] columns = new String[] { DatabaseHandler.KEY_ITEMNUMBER,
                DatabaseHandler.KEY_DESCRIPTION,
                DatabaseHandler.KEY_PICKINGSEQUENCE,
                DatabaseHandler.KEY_QTYONHAND,
                DatabaseHandler.KEY_QTYCOUNTED,
                DatabaseHandler.KEY_STOCKUNIT, DatabaseHandler.KEY_STATUS };
        int[] to = new int[] { R.id.text_itemnumber, R.id.text_desc,
                R.id.text_ps, R.id.text_qoh, R.id.text_qc, R.id.text_su,
                R.id.text_st };
        sca = new SimpleCursorAdapter(this, R.layout.list_row, cu, columns,
                to, 0);
        lv.setAdapter(sca);



    } catch (Exception ex) {
        Log.e("Failed", ex.getLocalizedMessage());
    }

}
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