SimpleCursorAdapter 上的安卓过滤器

Question

我已经在网上搜索了几天(实际上是几个晚上 ;)，但目前我一直在为我的问题寻找解决方案。基本上我想要的是 SQLite 的 ListView ，带有过滤器和重要的事情:保持列表行结果与 SQLite 行的一致。

我从一个基本的 ListView 开始很容易，但是不可能保持 SQLite 行和过滤后的 ListView 之间的一致性。然后我转向一个简单的游标，但我从未得到过滤结果，只显示了完整的 SQLite 列表。

我想我在告诉 SimpleCursorAdapter 用过滤刷新的方向上遗漏了一些东西。我发现很多页面都有一些代码，但似乎无法在我自己的代码中实现它。它与以下内容有关:setFilterQueryProvider(我认为)我还读过这个 SimpleCursorAdapter is now obsolete and moves to loaders?让我一步一个脚印，希望在一些帮助下我可以让这个过滤工作继续加载程序。

感谢您花时间阅读我的代码。现在已经快凌晨 5 点了，我希望我的英语还好:)

public class MainActivity extends Activity {
    String TAG = "MainActivity";            // for logging purposes
    private ArrayList<String> data;         // location which receives all products to display in the list
    static int ProductCursorPosition;       // the id which will returned by pressing the listview
    private ListView listView_Products;             // define the listview variabele
    SimpleCursorAdapter adapter;
    EditText inputSearch;

public void  onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    this.requestWindowFeature(Window.FEATURE_NO_TITLE);    
    setContentView(R.layout.act_main);
    Log.v(TAG, "onCreate");
 //   Worker dbworker = new Worker(this.getApplicationContext());
//  Log.v(TAG,"Open database");
//  dbworker.open();
//  Log.v(TAG,"Get database entry's");           
//  data = dbworker.getProductListView(); 
//  dbworker.close();
}

@Override
protected void onResume() {
    super.onResume();
    Log.v(TAG, "onResume");
    displayListView();          // show me the products in the listview
    aantalbestellingen();       // update the total numbers of bread waiting in order
}

// display the listview with products
public void displayListView() {
    Log.v(TAG,"Select database");
    Worker dbworker = new Worker(this.getApplicationContext());
    Log.v(TAG,"Open database");
    dbworker.open();
    String[] columns = new String[]{ Worker.KEY_ROWID, Worker.KEY_PRODUCT};
    String[] from = new String[]{Worker.KEY_PRODUCT};

    int [] to = {R.id.text1};
    final Cursor cursor = Worker.ourDatabase.query(true, // isdistinct
            Worker.DB_TABLE_PROD, // table name
            columns,// select clause
            null, // where cluase
            null, // where clause parameters
            null, // group by
            null, // having
            null, // nogwat 
            null);// limit
    startManagingCursor(cursor);


    adapter = new SimpleCursorAdapter(this, R.layout.lv_customlayout01, cursor, from, to);

    // find the view for the listview and connect the listView_Products to it
    listView_Products = (ListView) findViewById(R.id.lvProducts);
    // Shows the adapter content in the listview
    listView_Products.setAdapter(adapter);  

    dbworker.close();


    /**
     * Enabling Search Filter
     * */
    inputSearch = (EditText) findViewById(R.id.etSearchbar); 
    inputSearch.addTextChangedListener(new TextWatcher() {

        @Override
        public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
            // When user changed the Text
            Log.v(TAG,"Filter: onTextChanged");
            Log.v(TAG,"Filterstring: " + cs);
            Log.v(TAG,"adapter: " + adapter);
            adapter.getFilter().filter(cs); 
//          adapter.getFilter().filter(cs.toString());
        }

        @Override
        public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
                int arg3) {
            Log.v(TAG,"Filter: beforeTextChanged");
            // TODO Auto-generated method stub

        }

        @Override
        public void afterTextChanged(Editable arg0) {
            // TODO Auto-generated method stub
            Log.v(TAG,"Filter: afterTextChanged");
//          adapter.notifyDataSetChanged();

        }
    });


    listView_Products.setOnItemClickListener( new OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
        // TODO Auto-generated method stub
        Log.v(TAG, "Pressed the listview\n" + 
        "View arg2 = " + arg2 + "\n" +
        "int arg3 = " + arg3 + "\n");   
    }
    });

}

}

好的，我稍微修改了一下代码:现在我有一个带有过滤结果的 ListView 。

// display the listview with products
public void displayListView() {
    Log.v(TAG,"DB select");
    Worker dbworker = new Worker(this.getApplicationContext());
    Log.v(TAG,"DB open");
    dbworker.open();

    // SQLite get cursor from Worker 
    final Cursor ItemCursor = Worker.cursorsetup01();
    // Start managing the cursor
    startManagingCursor(ItemCursor);

    // Columns to be bound to the adapter
        String[] FROMcolumns = new String[]{Worker.KEY_PRODUCT, Worker.KEY_INFO };
        // THE XML DEFINED VIEWS WHICH THE DATA WILL BE BOUND TO
        int[] ToXMLView = new int[] {R.id.tvProduct, R.id.tvProductInfo};
        // CREATE THE ADAPTER USING THE CURSOR POINTING TO THE DESIRED DATA AS WELL AS THE LAYOUT INFORMATION

        Log.v(TAG,"CREATE THE ADAPTER");    
        adapter = new SimpleCursorAdapter(this, R.layout.lv_customlayout01, ItemCursor, FROMcolumns, ToXMLView);
        // find the view for the listview and connect the listView_Products to it

        listView_Products = (ListView) findViewById(R.id.lvProducts);
        // SET THIS ADAPTER AS YOUR LISTACTIVITY'S ADAPTER
        listView_Products.setAdapter(adapter);      

    adapter.setFilterQueryProvider(new FilterQueryProvider() {

        public Cursor runQuery(final CharSequence substring) {
            String[] dbquerycolumns = new String[]{Worker.KEY_PRODUCT, Worker.KEY_INFO, Worker.KEY_ROWID };    
            Worker dbworker = new Worker(getApplicationContext());
            Log.v(TAG,"Open database");
            dbworker.open();
            return Worker.ourDatabase.query(
                            Worker.DB_TABLE_PROD, // TABLE
                            dbquerycolumns,// COLUMNS
                            "product LIKE '%" + substring.toString() + "%'" , // SELECTION
                            null, // SELECTION ARGS
                            null, // GROUP BY
                            null, // HAVING
                            "_id LIMIT 100");// ORDER BY (limit the results to 100)
                    }

        });


    // Connect the textedit searchbar to a change listener and action upon changes
    mySearchText = (EditText)findViewById (R.id.etSearchbar);
    mySearchText.addTextChangedListener (new TextWatcher() {

        @Override
        public void afterTextChanged (Editable s) {
            Log.v(TAG,"Textchanged: AfterTextChanged: " + s);
            adapter.getFilter().filter(s.toString());
            startManagingCursor(ItemCursor);
        }

Answer 1

我已经为过滤文本创建了自己的方法:

/** For Filter City **/
@SuppressWarnings("deprecation")
private SimpleCursorAdapter getAdapter(String city)
{
    dbHelper.open();
    if(city.equals(null))
    {
        cityCursor = dbHelper.getComapnyArea(city);
    }
    else
    {
        cityCursor = dbHelper.getComapnyArea(city);
    }

    if (cityCursor != null) {
        String columns[] = new String[] { DatabaseHelper.CA_NAME };

        int to[] = new int[] { R.id.listTextView };

        cityAdapter = new SimpleCursorAdapter(context, R.layout.list_textview, cityCursor, columns, to);
        listView.setAdapter(cityAdapter);
    }
    dbHelper.close();

    return cityAdapter;
}

这将在 SearchView 中使用，例如:

/** For Filter City **/
@SuppressWarnings("deprecation")
private SimpleCursorAdapter getAdapter(String city)
{
    dbHelper.open();
    if(city == null)
    {
        cityCursor = dbHelper.getComapnyArea();
    }
    else
    {
        cityCursor = dbHelper.getComapnyArea(city);
    }

    if (cityCursor != null) {
        String columns[] = new String[] { DatabaseHelper.CA_NAME };

        int to[] = new int[] { R.id.listTextView };

        cityAdapter = new SimpleCursorAdapter(context, R.layout.list_textview, cityCursor, columns, to);
    }

    return cityAdapter;
}