我已经在网上搜索了几天（实际上是晚上;），但此刻我很难找到解决问题的方法。基本上我想要的是SQLite的listview，带过滤器和重要的事情：保持列表行结果与SQLite行一致。
我已经通过基本列表视图轻松开始了，但是不可能保持SQLite行和过滤后的列表视图之间的一致性。 然后我转到了一个简单的游标，但是我从来没有得到过滤结果，只显示了完整的SQLite列表。
我想我错过了告诉SimpleCursorAdapter通过过滤刷新的方向。我发现很多页面包含一些代码，但似乎无法在我自己的代码中实现它。它与：setFilterQueryProvider（我认为）有关 我还读过这个SimpleCursorAdapter现在已经过时并转向装载机？ 让我一步一步，希望通过一些帮助，我可以让这个过滤工作转向装载机。
感谢您抽出宝贵时间阅读我的代码。因为现在早上差不多5点钟，我希望我的英语还可以。:)
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，我已经改变了一下代码： 现在我有一个带有过滤结果的列表视图。
// 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);
}
答案 0 :(得分：1)
我为滤镜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，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;
}
答案 1 :(得分：0)
可以帮助你的一些事情
现在，您需要修改现有代码的几件事。
Collection1 Collection2 Collection2的条目并使用新过滤器重新创建它（b）使用最新的collection2创建适配器的新实例（c）设置此新实例到listView（d）回收旧实例进行优化这样，您的更新将立即发送给用户，同时您可以完全控制解决当前问题以及可能出现的任何问题。