我已经在网上搜索了几天（实际上是晚上；），但目前我一直在为我的问题寻找解决方案。基本上我想要的是一个 SQLite 的列表视图，带有过滤器和重要的东西：保持列表行结果与 SQLite 行的一致。
我从一个基本的列表视图开始很容易，但是不可能保持 SQLite 行和过滤后的列表视图之间的一致性。然后我转向一个简单的光标，但我从来没有得到过滤的结果，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： setFilterQueryProvider （我认为）我也读过这个 SimpleCursorAdapter 现在已经过时并转移到装载机？让我一步一步来，所以希望在一些帮助下，我可以让这个过滤器继续工作到加载器。
感谢您花时间阅读我的代码。因为现在已经快凌晨 5 点了，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，我稍微更改了代码： 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);
}