过滤 SimpleCursorAdapter

Question

此代码通过显示数据库中的所有数据正常工作，但我在过滤时遇到问题。我尝试了很多代码但没有任何效果，有人可以帮助我吗？谢谢

 package com.example.dictionary;


    import java.util.List;
    import com.example.dictionary.R;
    import android.os.Bundle;
    import android.app.Activity;
    import android.database.Cursor;
    import android.support.v4.widget.SimpleCursorAdapter;
    import android.text.Editable;
    import android.text.TextWatcher;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.ListView;


    public class MainActivity extends Activity{
        Cursor cursor;
        ListView listView;
        SimpleCursorAdapter adapter;
        Button back, clear;
        List<String> items;
        String get;
        EditText et;
        int textlength = 0;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        et = (EditText) findViewById(R.id.editText1);

打开我的数据库并获取所有数据

        Historydb db = new Historydb(this);
        db.open();        
        cursor = db.getword();
        startManagingCursor(cursor);
        cursor.moveToFirst();
        adapter = new SimpleCursorAdapter(this,
                    android.R.layout.simple_list_item_1, cursor,
                    new String[] { "word" }, new int[] { android.R.id.text1 });

       listView = (ListView) findViewById(R.id.listView1);
       listView.setAdapter(adapter);

我在编辑文本中设置了 addtextchangelistener。

        et.addTextChangedListener(new TextWatcher() {
        public void afterTextChanged(Editable s) {

        // Abstract Method of TextWatcher Interface.
        }

         public void beforeTextChanged(CharSequence s, int start, int count,int after) {
        // Abstract Method of TextWatcher Interface.

         }
          public void onTextChanged(CharSequence s, int start, int before,int count) {


          adapter.getFilter().filter(s);


           }});
   }

}

Answer 1

它不起作用，因为adapter.getfilter().filter(cs); 不能直接用于 SimpleCursorAdapter。 对于SimpleCursorAdapter，您必须先使用adapter.setFilterQueryProvider。

这里是完整的描述：ListView, SimpleCursorAdapter, an an EditText filter -- why won't it do anything?

还有这个：Using an EditText to filter a SimpleCursorAdapter-backed ListView

Answer 2

试试这个....

@Override
public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
// When user changed the Text
((SimpleAdapter) YourActivity.this.adapter).getFilter().filter(cs);  
}